JP2008232580A - Refrigeration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigeration apparatus having a function connected to a refrigerant circuit 20 to individually analyze the state of circuit components constituting the refrigerant circuit 20. <P>SOLUTION: This refrigeration apparatus 10 includes a compressor 30, pressure reducing means 36, 39 and the refrigerant circuit 20 to which the circuit components including a plurality of heat exchangers 34, 37 are connected, wherein a refrigerant is circulated in the refrigerant circuit 20 to perform a refrigeration cycle. The apparatus further includes a refrigerant state detecting means 51 for detecting the temperature and entropy of the refrigerant at the outlet and inlet of each of the compressor 30, the pressure reducing means 36, 39 and the heat exchangers 34, 37, and a change amount calculating means 52 for individually calculating the magnitude of energy variation in refrigerant occurring in each circuit component by using the temperature and entropy of the refrigerant detected by the refrigerant state detection means 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigeration apparatus having a function of analyzing a state of a refrigeration apparatus, and an analysis apparatus for the refrigeration apparatus.

  2. Description of the Related Art Conventionally, a refrigeration apparatus including a refrigerant circuit that performs a vapor compression refrigeration cycle has a function of analyzing the state of the refrigeration apparatus. This type of refrigeration apparatus is configured to analyze the state of the refrigeration apparatus, for example, by comparing an operation state grasped from detection values of a temperature sensor and a pressure sensor with a normal operation state.

  Specifically, Patent Document 1 discloses an air conditioner that analyzes the state of a refrigeration apparatus using a Mollier diagram showing the relationship between pressure and enthalpy to diagnose normality and abnormality of components. In this air conditioner, the outdoor unit includes a compressor, a four-way valve, and an outdoor heat exchanger, and the indoor unit includes an indoor heat exchanger as constituent devices. The air conditioner diagnosis apparatus (controller) includes a numerical value conversion means, a first input means, a first characteristic calculation means, a second characteristic calculation means, a characteristic diagnosis means, and a result display means.

In this air conditioner, when a diagnosis start command is issued from the diagnostic device, first, the numerical value conversion means converts the temperature and pressure voltage values detected by the temperature sensor and the pressure sensor into numerical values. Moreover, the refrigerant | coolant amount of an outdoor unit and an indoor unit, the length of connection piping, etc. are input into a 1st input means. Next, the first characteristic calculation means creates a normal Mollier diagram based on the information obtained by the first input means and the numerical value conversion means. Next, the second characteristic calculation means creates a Mollier diagram during operation. Next, the characteristic diagnosing unit compares the Mollier diagram when the first characteristic calculating unit is normal and the Mollier diagram when the second characteristic calculating unit is in operation, and specifies the failure location or the failure factor. Then, the result display means displays the contents of diagnosis by the characteristic diagnosis means.
JP 2001-133011 A

  However, in the conventional refrigeration system, it is possible to analyze the entire refrigeration cycle from the comparison of the Mollier diagram in a normal operation state and the Mollier diagram at the time of diagnosis. It was difficult to analyze.

  Specifically, what is detected from the comparison between the Mollier diagram in the normal operation state and the Mollier diagram at the time of analysis is the difference between the normal operation state and the analysis time for the air conditioning capacity, the discharge refrigerant or the intake refrigerant. These include pressure differences and temperature differences between normal operating conditions and analysis. The numerical values representing the difference between the normal operating state and the analysis time do not correspond only to the state of each component device. Moreover, since these numerical values have different units, it is difficult to associate them with each other. Therefore, it is difficult to individually analyze the state of each component device.

  Moreover, in the conventional refrigeration apparatus, the state of the component parts (for example, refrigerant | coolant piping which connects component apparatuses) other than the component apparatus cannot be analyzed.

  This invention is made | formed in view of this point, The objective is providing the refrigeration apparatus which has a function which can analyze individually the state of the circuit component which is connected to a refrigerant circuit and comprises a refrigerant circuit. It is to be.

  The first invention includes a refrigerant circuit (20) configured by connecting circuit components including a compressor (30), a pressure reducing means (36, 39), and a plurality of heat exchangers (34, 37). The refrigeration apparatus (10) that performs the refrigeration cycle by circulating the refrigerant in the refrigerant circuit (20) is an object. This refrigeration apparatus (10) is a refrigerant that detects the temperature and entropy of the refrigerant at the inlet and outlet of the compressor (30), the decompression means (36, 39), and the heat exchanger (34, 37). The amount of change for individually calculating the magnitude of the refrigerant energy change generated in each of the circuit components using the state detection means (51) and the refrigerant temperature and entropy detected by the refrigerant state detection means (51) And calculating means (52).

  In the first invention, the change amount calculation means (52) uses the refrigerant temperature and entropy detected by the refrigerant state detection means (51), the compressor (30), the pressure reduction means (36, 39), and a plurality of The magnitude of the refrigerant energy change generated in each of the circuit components including the heat exchangers (34, 37) (hereinafter, these component devices are referred to as main component devices) is calculated individually. Here, if the temperature and entropy of the refrigerant at the outlet and inlet of each main component device are used, it is possible to individually calculate the magnitude of the refrigerant energy change that occurs in each circuit component. Specifically, in the Ts diagram created by using the refrigerant temperature and entropy at the outlet and inlet of each main component device, the magnitude of the refrigerant energy change that occurs in each circuit component is shown in FIG. It is represented by the area of each region. That is, it is possible to calculate the magnitude of the refrigerant energy change that occurs in each circuit component from the area of each region. In the first aspect of the invention, the magnitude of the refrigerant energy change generated in each of the circuit components is represented by using the fact that the magnitude of the refrigerant energy change generated in each circuit component is represented in the Ts diagram. Is calculated individually.

  According to a second invention, in the first invention, a fluid component (12, 14, 28, 75, 76b) through which a fluid that exchanges heat with a refrigerant flows in the heat exchanger (34, 37), and the circuit configuration described above. At least one of the component and the fluid component (12, 14, 28, 75, 76b) is a diagnosis target component, and the state of the diagnosis target component is determined based on the calculated value calculated by the change amount calculation means (52). Diagnostic means (54) for diagnosis.

  In the second invention, the diagnosis means (54) uses at least one of the circuit component and the fluid component (12, 14, 28, 75, 76b) as a diagnosis target component, and the refrigerant generated in each of the circuit components. Diagnose the condition of the diagnosis target component based on the magnitude of the energy change.

  Here, the magnitude of the energy change of the refrigerant generated in the circuit component represents, for example, the magnitude of the loss generated in the circuit component, and corresponds to the state of the circuit component. For example, the magnitude of the refrigerant energy change that occurs in the compressor (30) as a circuit component represents the magnitude of the loss that occurs in the compressor (30). This corresponds to the state of deterioration of sliding members such as bearings in the compressor (30), the state of deterioration of refrigerating machine oil, and the like.

  In addition, the magnitude of the refrigerant energy change that occurs in the circuit components is not only the state of the circuit components, but also the fluid components (12, 12) that the fluid that exchanges heat with the refrigerant that flows through the heat exchanger (34, 37) flows , 14, 28, 75, 76b). For example, the magnitude of the change in the energy of the refrigerant generated in the heat exchanger (34, 37) as a circuit component mainly represents the magnitude of the loss due to heat exchange or circulation of the refrigerant. 37) Not only corresponds to the state of the piping of itself, but also the operating state of the fan, which is the fluid component (12, 14, 28, 75, 76b) corresponding to the heat exchanger (34, 37) and the filter It corresponds to the state.

  Thus, the magnitude of the refrigerant energy change generated in each circuit component corresponds to the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b). Therefore, in the second aspect of the invention, the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b) are individually determined based on the magnitude of the energy change of the refrigerant generated in each circuit component. Diagnosed.

  According to a third aspect, in the second aspect, the fan (12, 14) for sending air to the heat exchanger (34, 37) is the fluid component (12, 14, 28, 75, 76b). The diagnostic means (54) uses the fan (12, 14) as the diagnosis target part, and the fan (12, 14) based on the calculated value calculated by the change amount calculating means (52). ) Is diagnosed.

  In the third invention, the diagnostic means (54) uses the fans (12, 14) for sending air to the heat exchangers (34, 37) as the parts to be diagnosed. The state of the fans (12, 14) is diagnosed based on the magnitude of the refrigerant energy change that occurs in each of the circuit components.

  According to a fourth invention, in the second or third invention, the change amount calculating means (52) determines the magnitude of the refrigerant energy change generated in each of the circuit component parts, and the loss generated in each of the circuit component parts. The diagnosis means (54) diagnoses the state of the diagnosis target component based on the calculated value calculated by the change amount calculation means (52) as the loss value.

  In the fourth invention, the change amount calculating means (52) calculates the magnitude of the refrigerant energy change occurring in each circuit component as the value of the loss occurring in each circuit component. The diagnosis means (54) diagnoses the state of the diagnosis target component based on the value of loss generated in each circuit component.

  In a fifth aspect based on the fourth aspect, the change amount calculating means (52) individually calculates a plurality of types of loss values generated in the heat exchangers (34, 37), and the diagnostic means (54 ) For the loss generated in each of the heat exchangers (34, 37), the state of the diagnosis target component is diagnosed based on the calculated values for each of the plurality of types of loss calculated by the change amount calculation means (52). .

  In the fifth aspect of the present invention, a plurality of types of loss values are calculated for the loss occurring in the heat exchanger (34, 37) among the circuit components. The loss values for each of the plurality of types of losses are used for diagnosis of the state of the diagnosis target component. Here, if the temperature and entropy of the refrigerant at the outlet and the inlet of each main component device are used, it is possible to calculate a plurality of types of loss values for the heat exchangers (34, 37). For example, in the above-described Ts diagram (see FIG. 2), the loss of the evaporator or the radiator is subdivided into a loss due to heat exchange, a loss due to frictional heat generation, and a pressure loss due to flow path resistance. That is, in the fifth invention, the loss of the heat exchanger (34, 37) is subdivided into a plurality of types of loss, and the subdivided loss value is used for diagnosis of the state of the diagnosis target component.

  According to a sixth invention, in the fourth or fifth invention, the refrigerant circuit (20) includes a main circuit (66) provided with a compressor (30) for compressing the refrigerant to the high pressure of the refrigeration cycle; A plurality of branch circuits (67) connected in parallel to the main circuit (66), and a flow rate calculation means (56) for calculating a refrigerant flow rate of each of the branch circuits (67). The calculating means (52) calculates the value of the loss generated in the circuit component using the refrigerant flow rate of each branch circuit (67) calculated by the flow rate calculating means (56).

  In the sixth invention, the refrigerant circuit (20) includes a main circuit (66) and a plurality of branch circuits (67). Here, the refrigeration cycle of the refrigerant circuit (20) in which the refrigerant of the main circuit (66) is distributed to the plurality of branch circuits (67) can be represented by a Ts diagram for each branch circuit (67). is there. In the Ts diagram of each branch circuit (67), the area of the region corresponding to the circuit component provided in the branch circuit (67) is large in loss generated in the circuit component of the branch circuit (67). This is expressed as a value per unit flow rate of the refrigerant. Further, in this T-s diagram, the area of the region corresponding to the circuit components provided in the main circuit (66) is the loss of the circuit components of the main circuit (66). Of the refrigerant flow rate, the magnitude corresponding to the refrigerant flow rate flowing into the branch circuit (67) is expressed as a value per unit flow rate of the refrigerant.

  And in this 6th invention, the value of the loss generated in the circuit components of the main circuit (66) and the branch circuit (67) uses the refrigerant flow rate of the branch circuit (67) calculated by the flow rate calculation means (56). Is calculated. For example, the flow rate calculation means (56) calculates the value of the loss generated in the circuit components of the branch circuit (67) in the area of the region corresponding to the loss in the Ts diagram of the branch circuit (67). It is calculated by multiplying the refrigerant flow rate of the branch circuit (67). Further, the flow rate calculation means (56) calculates the value of the loss generated in the circuit components of the main circuit (66) in the area of the region corresponding to the loss in the Ts diagram of each branch circuit (67). It is calculated as the sum total of the product of the branch circuit (67) multiplied by the refrigerant flow rate.

  In a seventh aspect based on the sixth aspect, the refrigerant circuit (20) includes a plurality of branch circuits (67) provided with the heat exchangers (34, 37), and the change amount calculating means (52) calculates the value of loss generated in the heat exchanger (34, 37) of the branch circuit (67) using the refrigerant flow rate of the branch circuit (67) calculated by the flow rate calculation means (56). To do.

  In the seventh invention, the refrigerant distributed from the main circuit (66) flows to the heat exchanger (34, 37) of each branch circuit (67). And the refrigerant | coolant merged after distribute | circulating the heat exchanger (34,37) of each branch circuit (67) returns to a main circuit (66). The value of the loss of the heat exchanger (34, 37) of each branch circuit (67) is calculated using the refrigerant flow rate of the branch circuit (67) calculated by the flow rate calculation means (56).

  According to an eighth invention, in any one of the fourth to seventh inventions, there is provided a loss storage means (53) for storing, as a loss reference value, a magnitude of loss generated in each circuit component in a normal operating state. The diagnosis means (54) diagnoses the state of the diagnosis target component based on the calculated value calculated by the change amount calculation means (52) and the loss reference value stored by the loss storage means (53).

  In the eighth invention, the diagnosis means (54) diagnoses the state of the component to be diagnosed based on the loss value in the normal operating state and the loss value at the time of diagnosis for the loss caused in each circuit component. . That is, the state of the part to be diagnosed is diagnosed based on the value of loss in the normal operating state.

  In a ninth aspect based on the eighth aspect, the diagnosis means (54) calculates the calculated value calculated by the change amount calculation means (52) and the loss storage means (53) for each loss generated in each circuit component. ) Is compared with the loss reference value stored in the above, the state of the part to be diagnosed is diagnosed.

  In the ninth invention, the diagnosis of the state of the part to be diagnosed is performed by calculating the change amount calculating means (52) for each loss occurring in each circuit component and the loss reference value stored by the loss storing means (53). This is done by comparing Therefore, the difference between the normal operating state and the time of diagnosis is clearly grasped for each loss occurring in each circuit component.

  In a tenth aspect based on the eighth or ninth aspect, the loss storage means (53) stores a loss reference value of a normal operation state for a plurality of operation conditions, and the diagnosis means (54) Of the loss reference values stored in the loss storage means (53), the loss reference value of the operation condition corresponding to the operation condition at the time of diagnosis is used for the diagnosis of the state of the diagnosis target component.

  In the tenth invention, the loss reference value of the operating condition corresponding to the operating condition at the time of diagnosis is used among the loss reference values stored in the loss storage means (53) for diagnosing the state of the part to be diagnosed. In other words, the loss reference value of the same operating condition as the operating state at the time of diagnosis, or if there is no same, the loss reference value of the closest operating condition at the time of diagnosis is selected from the loss reference values of multiple operating conditions and normal It is used for diagnosing the state of the part to be diagnosed as a reference value for the loss of the operating state.

  In an eleventh aspect based on any one of the second to seventh aspects, the diagnostic means (54) is configured to cause the diagnostic target component based on a temporal change in the calculated value calculated by the change amount calculating means (52). Diagnose the condition of

  In the eleventh aspect of the invention, the change over time of the calculated value calculated by the change amount calculating means (52) is used for diagnosing the state of the diagnosis target component. Here, in the case of the refrigeration apparatus (10) for comparing the stored loss value of the normal operation state with the loss value at the time of diagnosis, the refrigeration apparatus assumed when calculating the value of the loss of the normal operation state The installation environment of (10) (for example, the volume of the space for temperature adjustment) and the installation environment in which the refrigeration apparatus (10) is actually installed may not be the same. If the installation environment is not the same, the difference in the installation environment is included in the difference in the loss value between the normal operation state and the diagnosis. On the other hand, in the eleventh aspect of the invention, since the change over time of the calculated value by the change amount calculating means (52) is used for diagnosing the state of the diagnosis target component, only the loss value of the same installation environment can Used for condition diagnosis.

  In a twelfth aspect according to any one of the second to eleventh aspects, the display section (55) is provided for displaying a diagnosis result relating to the state of the diagnosis target component by the diagnosis section (54).

  In the twelfth invention, the refrigeration apparatus (10) is provided with display means (55). The display means (55) displays a diagnosis result relating to the state of the diagnosis target component diagnosed by the diagnosis means (54). The user of the refrigeration apparatus (10) can grasp the state of the part to be diagnosed by confirming the display on the display means (55).

  In a thirteenth aspect according to any one of the first to twelfth aspects, the refrigerant circuit (20) includes an inlet and an outlet of the compressor (30) and the heat exchangers (34, 37). In order to measure the temperature and pressure of the refrigerant, a temperature sensor (45) and a pressure sensor (46) are provided at one end and the other end of each of the compressor (30) and each heat exchanger (34, 37). While one set is provided, the refrigerant state detection means (51) is a value at the outlet of the heat exchanger (34, 37) serving as a radiator, with the refrigerant temperature and entropy at the inlet of the decompression means (36, 39). The refrigerant temperature and entropy at the outlet of the decompression means (36, 39) are set to the same values as those at the inlet of the heat exchanger (34, 37) serving as an evaporator.

  In the thirteenth invention, the temperature and entropy of the refrigerant at the inlet of the decompression means (36, 39) are detected as the same value as the value at the outlet of the heat exchanger (34, 37) serving as a radiator. Further, the temperature and entropy of the refrigerant at the outlet of the decompression means (36, 39) are detected as the same value as the value at the inlet of the heat exchanger (34, 37) serving as an evaporator. In other words, the temperature of the refrigerant at the outlet and the inlet of the decompression means (36, 39) and the pressure sensor are not provided on each of the one end side and the other end side of the decompression means (36, 39). Entropy is detected.

  In a fourteenth aspect based on the first aspect, as information for diagnosing the refrigeration apparatus (10), the refrigerant generated in each circuit component based on the calculated value calculated by the change amount calculating means (52). Display means (55) for displaying the state of energy change is provided.

  In the fourteenth invention, the display means (55) displays the state of energy change of the refrigerant generated in each circuit component based on the calculated value. The state of energy change of the refrigerant generated in each circuit component is displayed as information for diagnosing the refrigeration apparatus (10). As described above, the state of energy change of the refrigerant generated in the circuit component corresponds to the state of the circuit component. Therefore, for example, a person who has specialized knowledge about the refrigeration apparatus (10) sees the state of the circuit components and the like by observing the state of energy change of the refrigerant generated in each circuit component displayed on the display means (55). Can be diagnosed.

  A fifteenth aspect of the invention includes a refrigerant circuit (20) configured by connecting circuit components including a compressor (30), a pressure reducing means (36, 39), and a plurality of heat exchangers (34, 37). An analysis device (60) of a refrigeration apparatus connected to a refrigeration apparatus (10) for performing a refrigeration cycle by circulating refrigerant in the refrigerant circuit (20) and analyzing the state of the refrigeration apparatus (10) . And the analyzer (60) of this refrigeration apparatus calculates the temperature and entropy of the refrigerant at the respective inlets and outlets of the compressor (30), the decompression means (36, 39) and the heat exchanger (34, 37). Using the refrigerant state detection means (51) to detect and the temperature and entropy of the refrigerant detected by the refrigerant state detection means (51), the magnitude of the refrigerant energy change that occurs in each of the circuit components is calculated individually And a display means (55) for displaying the analysis result of the state of the refrigeration apparatus (10) based on the calculated value calculated by the change amount calculating means (52).

  In the fifteenth aspect of the invention, the refrigeration apparatus analysis device (60) includes the refrigerant state detection means (51) and the change amount calculation means (52) similar to the first aspect of the invention. The change amount calculation means (52) uses the refrigerant temperature and entropy detected by the refrigerant state detection means (51) to individually determine the magnitude of the refrigerant energy change generated in each of the circuit components including the main components. To calculate. Then, the analysis result of the state of the refrigeration apparatus (10) based on the calculated value calculated by the change amount calculating means (52) is displayed on the display means (55). In the fifteenth aspect of the invention, as in the first aspect of the invention, by utilizing the fact that the magnitude of the refrigerant energy change generated in each circuit constituent part is represented in the Ts diagram, The magnitude of the energy change of the refrigerant generated in each is calculated individually.

  In a sixteenth aspect based on the fifteenth aspect, in the refrigeration apparatus (10), fluid components (12, 14, 28,...) Through which a fluid exchanging heat with the refrigerant flows in the heat exchanger (34, 37). 75, 76b) is provided, and the change amount calculating means (52) calculates at least one of the circuit component part and the fluid part (12, 14, 28, 75, 76b) as a diagnosis target part. A diagnostic means (54) for diagnosing the state of the diagnostic target part based on the calculated value is provided, and the display means (55) uses the diagnostic means (54) as an analysis result of the state of the refrigeration apparatus (10). Displays the diagnosis result related to the status of the diagnosis target component.

  In the sixteenth aspect of the invention, the diagnostic means (54) uses at least one of the circuit component and the fluid component (12, 14, 28, 75, 76b) as a diagnosis target component, and supplies the refrigerant generated in each circuit component. Diagnose the condition of the diagnosis target component based on the magnitude of the energy change. The display means (55) displays a diagnosis result on the state of the diagnosis target part by the diagnosis means (54) as an analysis result of the state of the refrigeration apparatus (10). As described above, the magnitude of the refrigerant energy change generated in the circuit component corresponds to the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b). Accordingly, the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b) are individually diagnosed based on the magnitude of the energy change of the refrigerant generated in each circuit component.

  In a seventeenth aspect based on the fifteenth or sixteenth aspect, the display means (55) sets the calculated value calculated by the change amount calculating means (52) as an analysis result of the state of the refrigeration apparatus (10). Based on this, the state of energy change of the refrigerant generated in each circuit component is displayed.

  In the seventeenth aspect of the invention, the display means (55) indicates the state of refrigerant energy change occurring in each circuit component based on the calculated value calculated by the change amount calculating means (52) as the state of the refrigeration apparatus (10). Display as analysis results. Accordingly, as in the fourteenth aspect, for example, a person who has specialized knowledge about the refrigeration apparatus (10) looks at the state of refrigerant energy change occurring in each circuit component displayed on the display means (55). Thus, it is possible to diagnose the state of circuit components and the like.

  According to an eighteenth aspect of the present invention, in any one of the fifteenth to seventeenth aspects, the compressor (30), the pressure reducing means (36, 39), and the heat exchanger (34, 37) are respectively provided at an inlet and an outlet. A first component provided in the refrigeration apparatus (10) including at least a refrigerant state detection sensor (65) for detecting the refrigerant state of the refrigerant circuit (20) required for detecting the temperature and entropy of the refrigerant ( 47) and a second component (48) provided at least with the display means (55) and installed at a position distant from the refrigeration apparatus (10). The first component (47) and the second component The components (48) are connected to each other via a communication line (63).

  In the eighteenth aspect, the analyzer (60) of the refrigeration apparatus is composed of a first component (47) and a second component (48) connected to each other via a communication line (63). The second component (48) is provided with display means (55) for displaying the analysis result of the state of the refrigeration apparatus (10) based on the calculated value calculated by the change amount calculating means (52). Therefore, it is possible to check the state of the circuit components at a position away from the refrigeration apparatus (10).

  According to a nineteenth aspect of the present invention, in any one of the fifteenth to seventeenth aspects, the compressor (30), the decompression means (36, 39), and a heat exchanger (20) attached to the refrigerant circuit (20) 34, 37) includes a refrigerant state detection sensor (65) for detecting the refrigerant state of the refrigerant circuit (20) required for detecting the refrigerant temperature and entropy at the respective inlets and outlets, and the refrigerant state The detection means (51) calculates the refrigerant temperature and entropy at the inlet and outlet of the compressor (30), the decompression means (36, 39), and the heat exchanger (34, 37). The measurement value of the detection sensor (65) is used.

  In the nineteenth aspect, the refrigerant state detection sensor (65) is attached to the refrigerant circuit (20) when analyzing the state of the circuit components. Then, using the measured value of the refrigerant state detection sensor (65), the refrigerant state detection means (51) detects the temperature and entropy of the refrigerant at the outlet and inlet of each main component device, and the change amount calculation means (52) Calculates the value of the loss generated in each circuit component individually. In the nineteenth aspect, a person who has specialized knowledge about the refrigeration apparatus (10) carries the analyzer at the place where the refrigeration apparatus (10) is installed, for example, by carrying the analyzer of the refrigeration apparatus (10). It is possible to analyze the state of circuit components.

  In a twentieth aspect based on the nineteenth aspect, the refrigerant state detection sensor (65) includes a plurality of temperature sensors (65), one of which is attached to a heat exchanger (34, 37) serving as a radiator. The other one is attached to the heat exchanger (34, 37) serving as an evaporator, while the refrigerant state detecting means (51) is a temperature attached to the heat exchanger (34, 37) serving as a radiator. The high pressure of the refrigeration cycle is calculated based on the measured value of the sensor (65), and the low pressure of the refrigeration cycle is calculated based on the measured value of the temperature sensor (65) attached to the heat exchanger (34, 37) serving as an evaporator. By calculating the pressure, the temperature and entropy of the refrigerant at the respective inlets and outlets of the compressor (30), the decompression means (36, 39), and the heat exchanger (34, 37) are calculated.

  In the twentieth invention, the refrigerant state detection sensor (65) includes a plurality of temperature sensors (65). And the high pressure of a refrigerating cycle is computed based on the measured value of the temperature sensor (65) attached to the heat exchanger (34,37) used as a heat radiator, and the low pressure of a refrigerating cycle becomes an evaporator It is calculated based on the measured value of the temperature sensor (65) attached to the heat exchanger (34, 37). Here, in order to calculate the temperature and entropy of the refrigerant at the outlet and the inlet of each main component device, at least the value of the high pressure of the refrigeration cycle and the value of the low pressure are necessary. In the twentieth aspect, even if the refrigerant state detection sensor (65) does not include a pressure sensor, the refrigerant temperature and entropy at the outlet and inlet of each main component device are calculated.

  The present invention utilizes the fact that the magnitude of the refrigerant energy change generated in each circuit component is expressed in the Ts diagram created using the refrigerant temperature and entropy at the outlet and inlet of the main component equipment. Thus, the magnitude of the change in energy of the refrigerant generated in each circuit component is calculated individually. The magnitude of the refrigerant energy change that occurs in the circuit component represents, for example, the magnitude of the loss that occurs in the circuit component, and corresponds to the state of the circuit component. That is, according to the present invention, the state of the circuit component can be individually analyzed.

  Further, in each of the second and sixteenth inventions, the magnitude of the energy change of the refrigerant generated in each circuit component corresponding to the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b). By using this, the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b) are individually diagnosed. Since the diagnosis is performed in the same unit without using physical quantities of different units, the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b) are quantitatively grasped. Therefore, it is possible to accurately diagnose the state of the circuit components and the state of the fluid components (12, 14, 28, 75, 76b).

  In the fifth invention, the diagnosis means (54) uses the loss value for each of a plurality of types of subdivided loss values for the loss caused by the heat exchanger (34, 37). Diagnose. Therefore, since the state of the diagnosis target component can be grasped in more detail, the diagnosis of the state of the diagnosis target component can be performed more accurately.

  According to the eighth aspect, the state of the diagnosis target component is diagnosed based on the value of loss in the normal operation state. For this reason, since the state of the diagnostic target part at the time of diagnosis can be grasped as a difference from the normal operating state, the state of the diagnostic target part can be accurately diagnosed.

  In the ninth aspect of the invention, the calculated value calculated by the change amount calculating means (52) for each loss occurring in each circuit component is compared with the loss reference value stored by the loss storing means (53), so that normal The difference between the normal operation state and the time of diagnosis is clearly grasped for each loss occurring in each circuit component. In addition, since a comparison is made for each loss occurring in each circuit component, the difference between the normal operating state and the time of diagnosis is clearly grasped even for a small loss of the refrigeration apparatus (10) as a whole. Therefore, it is possible to more accurately diagnose the state of the diagnosis target component.

  In the tenth invention, for diagnosing the state of the part to be diagnosed, the loss reference value of the same operating condition as the operating state at the time of diagnosis, or the loss reference value of the closest operating condition at the time of diagnosis is used if there is no same. . Accordingly, the difference between the operating condition of the loss reference value and the operating condition at the time of diagnosis is reduced among the difference in loss value between the normal operating state and the time of diagnosis. And since the difference in the value of loss between the normal operating state and the time of diagnosis more accurately represents the difference in the state of the parts to be diagnosed between the normal operating state and the time of diagnosis, further diagnosis of the state of the parts to be diagnosed It can be done accurately.

  Further, according to the eleventh aspect, since the change over time of the calculated value by the change amount calculating means (52) is used for diagnosing the state of the diagnosis target component, only the loss value of the same installation environment is the state of the diagnosis target component. Used for diagnosis. Therefore, since the difference in installation environment is not included in the loss value used for diagnosing the state of the diagnosis target component, the state of the diagnosis target component can be accurately performed.

  Further, it is possible to diagnose the state of the diagnosis target component without storing the value of the loss in the normal operation state in the refrigeration apparatus (10) in advance. Therefore, since there is no need to store the value of the loss in the normal operating state in the refrigeration apparatus (10), the refrigeration apparatus (10) can be easily manufactured.

  According to the eighteenth aspect, the second component (48) provided with the display means (55) and connected to the first component (47) on the refrigeration apparatus (10) side via the communication line (63). ), It is possible to check the state of the circuit components at a position away from the refrigeration apparatus (10). Therefore, it becomes possible for a person having specialized knowledge about the refrigeration apparatus (10) to monitor the state of the circuit components on behalf of the user of the refrigeration apparatus (10). Can be diagnosed more accurately.

  According to the nineteenth invention, a person having specialized knowledge about the refrigeration apparatus (10) carries the analyzer (60) of the refrigeration apparatus (10), so that the refrigeration apparatus (10) is installed. It is possible to analyze the state of the circuit component at the place where Therefore, a person who has specialized knowledge about the refrigeration apparatus (10) can check the state of the circuit components on the spot in place of the user of the refrigeration apparatus (10). Moreover, since the analyzer (60) of the refrigeration apparatus (10) includes the refrigerant state detection sensor (65), it includes a sensor for detecting the temperature and entropy of the refrigerant at the outlet and inlet of each main component device. It is possible to analyze the state of the circuit components even for a refrigeration apparatus (10) that is not present.

  In the twentieth invention, the refrigerant temperature and entropy at the outlet and inlet of each main component device are calculated even if the refrigerant state detection sensor (65) does not include a pressure sensor. Therefore, the state of the circuit components can be easily analyzed by the temperature sensor (65) that is easily attached.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1 of the Invention
A first embodiment of the present invention will be described. Embodiment 1 is a refrigeration apparatus (10) according to the present invention. As shown in FIG. 1, the refrigeration apparatus (10) is an air conditioner including an outdoor unit (11) and an indoor unit (13), and includes a cooling operation (cooling operation) and a heating operation (heating operation). And are configured so as to be switched.

  In addition, this invention is applicable with respect to a freezing apparatus (10) provided with the refrigerant circuit (20) which performs a refrigerating cycle. For example, the refrigeration apparatus other than the air conditioner according to the first embodiment also includes a refrigeration apparatus (refrigerator or freezer) for cooling food, a refrigeration apparatus in which an air conditioner and a refrigerator or freezer are combined, and a heat exchanger. The present invention can be applied to a refrigeration apparatus with a humidity control function that uses the heat of the circulating refrigerant for heating or cooling the adsorbent, such as a refrigeration apparatus having a hot water supply function such as a so-called Ecocute (registered trademark).

-Configuration of refrigeration equipment-
An outdoor circuit (21) is provided in the outdoor unit (11). An indoor circuit (22) is provided in the indoor unit (13). In this refrigeration apparatus (10), a refrigerant circuit that performs a vapor compression refrigeration cycle by connecting an outdoor circuit (21) and an indoor circuit (22) with a liquid side connecting pipe (23) and a gas side connecting pipe (24). (20) is configured. The refrigerant circuit (20) is filled with, for example, a fluorocarbon refrigerant as the refrigerant.

《Outdoor unit》
The outdoor circuit (21) of the outdoor unit (11) includes a compressor (30), an outdoor heat exchanger (34) as a heat source side heat exchanger, and an expansion valve (36) as a decompression means as main components. In addition, a four-way switching valve (33) is provided. These main components and the four-way selector valve (33) constitute a circuit component and are connected to each other by refrigerant piping that also constitutes the circuit component. The circuit components are components that constitute the refrigerant circuit (20) and through which the refrigerant flows. At one end of the outdoor circuit (21), a liquid side shut-off valve (25) to which the liquid side communication pipe (23) is connected is provided. The other end of the outdoor circuit (21) is provided with a gas side shut-off valve (26) to which the gas side communication pipe (24) is connected.

  The compressor (30) is configured as a hermetic and high-pressure dome type compressor. The discharge side of the compressor (30) is connected to the first port (P1) of the four-way switching valve (33) via the discharge pipe (40). The suction side of the compressor (30) is connected to the third port (P3) of the four-way switching valve (33) via the suction pipe (41).

  The outdoor heat exchanger (34) is configured as a cross fin type fin-and-tube heat exchanger. In the vicinity of the outdoor heat exchanger (34), an outdoor fan (12) for sending outdoor air flowing through the interior to the outdoor heat exchanger (34) is provided. In the outdoor heat exchanger (34), heat is exchanged between the outdoor air sent by the outdoor fan (12) and the circulating refrigerant. The outdoor fan (12) constitutes a fluid component through which air that exchanges heat with the refrigerant flows in the outdoor heat exchanger (34). One end of the outdoor heat exchanger (34) is connected to the fourth port (P4) of the four-way switching valve (33). The other end of the outdoor heat exchanger (34) is connected to the liquid side shut-off valve (25) via the liquid pipe (42). The liquid pipe (42) is provided with an expansion valve (36) having a variable opening. In addition, the gas side closing valve (26) is connected to the second port (P2) of the four-way switching valve (33).

  The four-way selector valve (33) is in a first state in which the first port (P1) and the second port (P2) communicate with each other and the third port (P3) and the fourth port (P4) communicate with each other (FIG. 1). And a second state (FIG. 1) in which the first port (P1) and the fourth port (P4) communicate with each other and the second port (P2) and the third port (P3) communicate with each other. The state indicated by a broken line) can be switched.

  The outdoor circuit (21) includes one end of the compressor (30), the other end of the compressor (30), one end of the outdoor heat exchanger (34), and the other end of the outdoor heat exchanger (34). The temperature sensor (45) and the pressure sensor (46) are provided one by one. Specifically, the suction pipe (41) is provided with a pair of suction temperature sensors (45a) and a suction pressure sensor (46a). The discharge pipe (40) is provided with a pair of discharge temperature sensors (45b) and a discharge pressure sensor (46b). A pair of outdoor gas temperature sensors (45c) and an outdoor gas pressure sensor (46c) are provided between the outdoor heat exchanger (34) and the four-way switching valve (33). A pair of outdoor liquid temperature sensors (45d) and an outdoor liquid pressure sensor (46d) are provided between the outdoor heat exchanger (34) and the expansion valve (36). An outdoor temperature sensor (18) is provided in the vicinity of the outdoor fan (12).

《Indoor unit》
The indoor circuit (22) of the indoor unit (13) is provided with an indoor heat exchanger (37) that is a use side heat exchanger as a main component. The indoor heat exchanger (37) constitutes a circuit component and is connected to the outdoor circuit (21) through a refrigerant pipe that also constitutes the circuit component.

  The indoor heat exchanger (37) is configured as a cross-fin type fin-and-tube heat exchanger. In the vicinity of the indoor heat exchanger (37), an indoor fan (14) for sending indoor air flowing through the interior to the indoor heat exchanger (37) is provided. A filter (28) is provided between the indoor fan (14) and the indoor heat exchanger (37). In the indoor heat exchanger (37), heat is exchanged between the indoor air sent by the indoor fan (14) and the circulating refrigerant. The indoor fan (14) and the filter (28) constitute a fluid component through which air that exchanges heat with the refrigerant flows in the indoor heat exchanger (37).

  The indoor circuit (22) is provided with one set of a temperature sensor (45) and a pressure sensor (46) on one end side and the other end side of the indoor heat exchanger (37). Specifically, a pair of indoor liquid temperature sensors (45e) and an indoor liquid pressure sensor (46e) are provided between the liquid side end of the indoor circuit (22) and the indoor heat exchanger (37). A pair of indoor gas temperature sensors (45f) and an indoor liquid pressure sensor (46f) are provided between the indoor heat exchanger (37) and the gas side end of the indoor circuit (22). An indoor temperature sensor (19) is provided in the vicinity of the indoor fan (14).

"controller"
This refrigeration apparatus (10) controls the operating capacity of the compressor (30) and the opening degree of the expansion valve (36) in order to adjust the air conditioning capacity, and also diagnoses the components of the refrigeration apparatus (10) (50). Diagnosis target parts diagnosed by the controller (50) are circuit component parts including main components and the fluid parts (12, 14, 28). The controller (50) is for diagnosing the state of the diagnosis target component based on a thermodynamic analysis (exergy analysis) for analyzing a loss generated in each circuit component. The controller (50) includes a refrigerant state detection unit (51) that is a refrigerant state detection unit, a loss calculation unit (52) that is a change amount calculation unit, a loss storage unit (53) that is a loss storage unit, and a diagnosis unit. A diagnosis unit (54) and a display unit (55) as display means.

  Parts that can be diagnosed by the controller (50) by using thermodynamic analysis are circuit components in which refrigerant energy changes, and refrigerant circuits (20) such as fluid components (12, 14, 28). It is a part that affects the energy change of the refrigerant indirectly from the outside. For example, the outdoor fan (12) and the indoor fan (14) cause an energy change of the refrigerant by sending air to the heat exchangers (34, 37). Further, when the filter (28) is clogged, the air volume of the air sent to the heat exchanger (34, 37) changes to affect the energy change of the refrigerant.

  The refrigerant state detector (51) determines the inlet of the compressor (30), the outlet of the compressor (30), the inlet of the outdoor heat exchanger (34), the outdoor from the measured value obtained by each temperature sensor (45). 8 positions of outlet of heat exchanger (34), inlet of expansion valve (36), outlet of expansion valve (36), inlet of indoor heat exchanger (37) and outlet of indoor heat exchanger (37) It is configured to detect the temperature of the refrigerant. Further, the refrigerant state detection unit (51) is configured to calculate the inlet of the compressor (30), the outlet of the compressor (30), from the measured values obtained by the paired temperature sensor (45) and pressure sensor (46), Outdoor heat exchanger (34) inlet, outdoor heat exchanger (34) outlet, expansion valve (36) inlet, expansion valve (36) outlet, indoor heat exchanger (37) inlet, and indoor heat exchange The entropy of the refrigerant at the eight positions at the outlet of the vessel (37) is calculated.

  In the first embodiment, during the cooling operation, the refrigerant temperature and entropy at the inlet of the expansion valve (36) are detected as the same values as those at the outlet of the outdoor heat exchanger (34), and the expansion valve ( The refrigerant temperature and entropy at the outlet of 36) are detected as the same values as those at the inlet of the indoor heat exchanger (37). Further, during the heating operation, the refrigerant temperature and entropy at the inlet of the expansion valve (36) are detected as the same values as the values at the outlet of the indoor heat exchanger (37), and the refrigerant at the outlet of the expansion valve (36). Is detected as the same value as the value at the inlet of the outdoor heat exchanger (34).

  The loss calculation unit (52) includes circuit components (compressor (30), expansion valve (36), outdoor heat exchanger (34), indoor heat exchanger (37), indoor heat exchanger (37) and compressor. (30) and a pipe between the outdoor heat exchanger (34) and the compressor (30)) are individually calculated. The value of loss is calculated using the refrigerant temperature and entropy detected by the refrigerant state detection unit (51).

  The loss storage unit (53) stores a loss value generated in each circuit component (loss calculation target component) in a normal operation state as a loss reference value for each loss generated in each circuit component. As a loss reference value for each loss in each circuit component, a value calculated by simulation calculation is stored. The loss storage unit (53) stores loss reference values for a plurality of operating conditions with different operating conditions combining the indoor temperature and the outdoor temperature. Note that the circulation amount of the refrigerant may be applied as a combination of operating conditions.

  The diagnosis unit (54) diagnoses the state of the diagnosis target component using the circuit component, the outdoor fan (12), and the indoor fan (14) as the diagnosis target components. Diagnosis of the state of the diagnosis target component is performed by comparing the calculated value calculated by the loss calculation unit (52) with the loss reference value stored in the loss storage unit (53) for each loss generated in each circuit component. The display unit (55) is configured to be able to display the result of diagnosis in the diagnosis unit (54).

-Operation of refrigeration equipment-
Next, the operation of the refrigeration apparatus (10) will be described. The refrigeration apparatus (10) can perform a cooling operation and a heating operation, and the operation is switched by the four-way switching valve (33).

<Cooling operation>
In the cooling operation, the four-way switching valve (33) is set to the second state. When the compressor (30) is operated in this state, in the refrigerant circuit (20), the outdoor heat exchanger (34) becomes a condenser (radiator) and the indoor heat exchanger (37) becomes an evaporator. A compression refrigeration cycle is performed. In the cooling operation, the opening degree of the expansion valve (36) is appropriately adjusted.

  Specifically, the refrigerant discharged from the compressor (30) is condensed by exchanging heat with outdoor air in the outdoor heat exchanger (34). The refrigerant condensed in the outdoor heat exchanger (34) is depressurized when passing through the expansion valve (36), and then is evaporated by exchanging heat with indoor air in the indoor heat exchanger (37). The refrigerant evaporated in the indoor heat exchanger (37) is sucked into the compressor (30) and compressed.

<Heating operation>
In the heating operation, the four-way switching valve (33) is set to the first state. When the compressor (30) is operated in this state, in the refrigerant circuit (20), the outdoor heat exchanger (34) serves as an evaporator and the indoor heat exchanger (37) serves as a condenser (heat radiator). A compression refrigeration cycle is performed. In the heating operation, the opening degree of the expansion valve (36) is appropriately adjusted.

  Specifically, the refrigerant discharged from the compressor (30) is condensed by exchanging heat with indoor air in the indoor heat exchanger (37). The refrigerant condensed in the indoor heat exchanger (37) is decompressed when passing through the expansion valve (36), and thereafter evaporates by exchanging heat with outdoor air in the outdoor heat exchanger (34). The refrigerant evaporated in the outdoor heat exchanger (34) is sucked into the compressor (30) and compressed.

-Controller operation-
The operation when the controller (50) diagnoses the state of the diagnosis target component will be described. Diagnosis of the state of the part to be diagnosed is performed during cooling operation or heating operation. Below, the case where a diagnosis is performed during the cooling operation will be described.

  In the diagnosis of the state of the parts to be diagnosed, first, the refrigerant state detector (51) uses the measured values obtained by the paired temperature sensor (45) and pressure sensor (46) to determine the inlet of the compressor (30), Outlet of compressor (30), inlet of outdoor heat exchanger (34), outlet of outdoor heat exchanger (34), inlet of expansion valve (36), outlet of expansion valve (36), indoor heat exchanger (37 ) And the temperature and entropy of the refrigerant at eight positions of the outlet of the indoor heat exchanger (37).

  Specifically, the refrigerant temperature and entropy at the inlet of the compressor (30) are detected from measured values obtained by the suction temperature sensor (45a) and the suction pressure sensor (46a). The refrigerant temperature and entropy at the outlet of the compressor (30) are detected from the measured values obtained by the discharge temperature sensor (45b) and the discharge pressure sensor (46b). The refrigerant temperature and entropy at the inlet of the outdoor heat exchanger (34) are detected from measured values obtained by the outdoor gas temperature sensor (45c) and the outdoor gas pressure sensor (46c). The refrigerant temperature and entropy at the outlet of the outdoor heat exchanger (34) and the inlet of the expansion valve (36) are detected from the measured values obtained by the outdoor liquid temperature sensor (45d) and the outdoor liquid pressure sensor (46d). . The temperature and entropy of the refrigerant at the outlet of the indoor heat exchanger (37) are detected from the measured values obtained by the indoor gas temperature sensor (45f) and the indoor liquid pressure sensor (46f).

  Since the refrigerant at the outlet of the expansion valve (36) and the inlet of the indoor heat exchanger (37) is in a gas-liquid two-phase state, the temperature of the refrigerant is detected from the measured value of the indoor liquid temperature sensor (45e). However, the entropy of the refrigerant cannot be detected only by the measured values of the indoor liquid temperature sensor (45e) and the indoor liquid pressure sensor (46e). Therefore, the refrigerant entropy at the outlet of the expansion valve (36) and the inlet of the indoor heat exchanger (37) is detected as the enthalpy of the refrigerant being equal to the outlet of the outdoor heat exchanger (34).

  Next, the loss calculation unit (52) uses the refrigerant temperature and entropy detected by the refrigerant state detection unit (51) to compress the compressor (30), the expansion valve (36), the outdoor heat exchanger (34), And the value of the loss generated in each circuit component such as the indoor heat exchanger (37) is calculated individually.

  Here, FIG. 2 shows a Ts diagram created by using the refrigerant temperature and entropy at the outlet and inlet of each main component device. The values of these losses that occur in each circuit component are the areas (c, d, e, f, g1, g2, h1, h2, i, j, k) that are divided based on this Ts diagram. It is known to correspond to the area.

  Point A (1) shown in FIG. 2 is a point determined from the refrigerant temperature and entropy at the inlet of the compressor (30). Point B (1) is a point determined from the temperature and entropy of the refrigerant at the outlet of the compressor (30). Point C (1) is a point determined from the refrigerant temperature and entropy at the inlet of the outdoor heat exchanger (34). Point D (1) is a point determined from the refrigerant temperature and entropy at the outlet of the outdoor heat exchanger (34) (inlet of the expansion valve (36)). Point E (1) is a point determined from the refrigerant temperature and entropy at the inlet of the indoor heat exchanger (37) (outlet of the expansion valve (36)). Point F (1) is a point determined from the temperature and entropy of the refrigerant at the outlet of the indoor heat exchanger (37).

  Point C (2) is a point located on an isobaric line that has the same entropy as point C (1) and passes through point D (1). Point D (2) is a point where an isoenthalpy line passing through point D (1) and an isobar passing through point C (1) intersect. Point D (3) is a point where an isoenthalpy line passing through point D (1) and a constant pressure line passing through point B (1) intersect. Point E (2) is a point where an isoenthalpy line passing through point E (1) and a constant pressure line passing through point F (1) intersect. Point F (2) is a point located on an isobaric line that has the same entropy as point F (1) and passes through point E (1).

  Point G (1) is a point where the isobaric line passing through point C (1) and the saturated vapor line intersect. Point G (2) is the point where the isobaric line passing through point C (2) and the saturated vapor line intersect. Point G (3) is a point where the isobaric line passing through point B (1) and the saturated vapor line intersect. Point H (1) is a point where the isobaric line passing through point D (1) and the saturated liquid line intersect. Point H (2) is a point where the isobaric line passing through point D (2) and the saturated liquid line intersect. Point H (3) is a point where the isobaric line passing through point D (3) and the saturated liquid line intersect. Point I (1) is the point where the isoenthalpy line passing through point D (1) and the saturated liquid line intersect. Point J (1) is a point where the isobaric line passing through point F (1) and the saturated vapor line intersect. Point J (2) is a point where the isobaric line passing through point F (2) and the saturated vapor line intersect.

  Th is the temperature of the air sent to the outdoor heat exchanger (34) (measured value of the outdoor air temperature sensor (18)), and Tc is the temperature of the air sent to the indoor heat exchanger (37) (the indoor temperature sensor (19 ))).

  And the area | region of (a) shown in FIG. 2 represents the workload of a reverse Carnot cycle. The area (b) represents the endothermic amount in the indoor heat exchanger (37). The area (c) represents the loss associated with heat exchange in the indoor heat exchanger (37). Region (d) represents the loss associated with heat exchange in the outdoor heat exchanger (34). The region (e) represents the friction loss when the refrigerant passes through the expansion valve (36). The region (f) represents the loss due to mechanical friction in the compressor (30). The region (g1) represents the loss due to frictional heat generation in the indoor heat exchanger (37). The region (g2) represents the pressure loss in the indoor heat exchanger (37). The area (h1) represents the loss due to frictional heat generation in the outdoor heat exchanger (34). The area (h2) represents the pressure loss in the outdoor heat exchanger (34). Region (i) represents a loss or pressure loss due to heat penetration from the indoor heat exchanger (37) to the compressor (30). Region (j) represents a loss due to heat radiation from the compressor (30) to the outdoor heat exchanger (34). The region (k) represents the pressure loss from the compressor (30) to the outdoor heat exchanger (34).

  As loss values generated in the outdoor heat exchanger (34) and the indoor heat exchanger (37), three types of loss values are calculated: loss due to heat exchange, loss due to frictional heat generation, and pressure loss. Here, when the temperature and entropy of the refrigerant at the outlet and inlet of each main component device are used, there are a plurality of heat exchangers (34, 37) serving as an evaporator and heat exchangers (34, 37) serving as a condenser. The inventor of the present application has found that the value of the type of loss can be calculated. This will be described. In the following, the case of a heat exchanger serving as an evaporator will be described.

  If the state of the refrigerant | coolant from the inlet_port | entrance of an evaporator to an exit is represented with a Ts diagram, it will come to show in FIG. In FIG. 3, point E (1) is a point determined from the refrigerant temperature (T1) and entropy (s1) at the inlet of the evaporator, and point F (1) is the refrigerant temperature (T2) at the outlet of the evaporator. The point E (2) is a point where an isoenthalpy line passing through the point E (1) and a constant pressure line passing through the point F (1) intersect.

  Here, in an ideal state where no loss occurs in the refrigeration cycle, the pressure does not change when the refrigerant absorbs heat from the outside. For this reason, the line connecting the point E (2) and the point F (1) located on the isobaric line changes the state of the refrigerant from the inlet to the outlet of the evaporator in the ideal state, that is, the refrigerant is only absorbed by heat absorption. It represents a change in state. Therefore, the endothermic amount in the evaporator is represented by a region (b) which is a region below the line connecting the point E (2) and the point F (1).

Moreover, when the change of the refrigerant | coolant state from the inlet of an evaporator to an exit is represented by numerical formula, it will become the formula 1 shown below.
Formula 1: ds = (dq + dq (fr)) ÷ T

In the above equation 1, ds is the amount of increase in specific entropy, dq is the amount of heat that the refrigerant absorbs from the outside, dq (fr) is the amount of frictional heat generated by pressure loss, and T is the evaporation temperature. Then, when Expression 1 is integrated for the interval [s1, s2], Expression 2 shown below is obtained.
Formula 2: ∫Tds = ∫dq + ∫dq (fr) = Q + Q (fr)

  In the above formula 2, Q represents the heat absorption amount of the refrigerant in the evaporator, and Q (fr) represents the frictional heat generation amount due to the pressure loss in the evaporator.

  The value of ∫Tds in Expression 2 corresponds to the area of the area under the curve connecting the points E (1) and F (1) in FIG. Accordingly, from this region, the region (g1) excluding the region (b) corresponding to the heat absorption amount Q of the refrigerant in the evaporator becomes the region corresponding to the frictional heat generation amount Q (fr) in the evaporator. Then, by calculating the area of the region (g1), it is possible to calculate the value of frictional heat generation in the evaporator as one loss of the evaporator. The frictional heat generation amount Q (fr) in the evaporator corresponds to a reduction in the heat absorption amount in the evaporator due to frictional heat generation due to pressure loss.

  From the same idea, it can be derived that the region (g2) in FIG. 2 corresponds to the pressure loss of the evaporator. Then, by calculating the area of the region (g2), it is possible to calculate the value of the pressure loss in the evaporator as one loss of the evaporator.

  The loss calculation unit (52) calculates the loss values corresponding to the regions (c) to (k) for each region (c, d, e, f, g1, g2, h1, h2, i, j, k). Is calculated by calculating the area. The loss value may be calculated as the enthalpy represented by the area of each region (c, d, e, f, g1, g2, h1, h2, i, j, k), or the refrigerant circulation amount is included in the enthalpy. It may be calculated as energy (work) multiplied by. Since the refrigerant flow rates of all circuit components are the same, even when the loss value is expressed as enthalpy, it is possible to relatively express the magnitude of the loss generated in each circuit component.

  A diagnosis part (54) selects the loss reference value of the operation condition corresponding to the operation condition at the time of diagnosis among the loss reference values of the plurality of operation conditions stored in the loss storage part (53). As the corresponding operating conditions, the room temperature and the outdoor temperature are the same as those at the time of diagnosis, or the closest ones at the time of diagnosis are selected if there is no same. The diagnosis unit (54) compares the calculated value calculated by the loss calculation unit (52) with the loss reference value of the loss storage unit (53) of the selected operating condition for each loss generated in each circuit component. Thus, the state of the diagnosis target component is diagnosed.

  For example, when the value of loss due to mechanical friction in the compressor (30) at the time of diagnosis (value corresponding to the region of (f)) is larger than the normal operating state (state shown in FIG. 4) Means that mechanical loss (friction heat generation) in the compressor (30) and Joule heat generation of the motor are increasing. Therefore, the diagnosis unit (54) diagnoses that the compressor oil (30) is deteriorated in the refrigeration machine oil or the sliding member such as the bearing is progressing or the circuit resistance of the electrical component is increasing. . Then, the diagnosis unit (54) determines that the compressor (30) is in a failure state when the value of the loss at the time of diagnosis is, for example, 10% or more larger than that in the normal operation state.

  In addition, the inventor of this application has confirmed by simulation calculation that the magnitude | size of the value of the loss which arises with a compressor (30) reflects the state of a compressor (30). The result of the simulation calculation is shown in FIG. FIG. 5 shows the result of the simulation calculation in three cases (2% decrease, 4% decrease, 6% decrease) in which the degree of decrease in the capacity of the compressor (30) is changed based on a predetermined value. . In FIG. 5, as the degree of decrease in the capacity of the compressor (30) increases, the value of the loss generated in the compressor (30) increases. And as the damage or malfunction of the compressor (30) progresses, the degree of decrease in the capacity of the compressor (30) increases, so the greater the value of loss generated in the compressor (30), the more the compressor (30) is damaged. It can be confirmed from FIG.

  Further, when the value of loss due to heat exchange in the indoor heat exchanger (37) at the time of diagnosis (value corresponding to the area of (c)) is larger than the normal operating state (as shown in FIG. 6). Means that the evaporation temperature of the refrigerant in the indoor heat exchanger (37) is lower than that in a normal operating state. Therefore, the diagnosis unit (54) diagnoses that the air volume of the air passing through the indoor heat exchanger (37) is reduced. Then, the diagnosis unit (54) causes the indoor fan (14) to deteriorate as the cause of the decrease in the air volume of the air passing through the indoor heat exchanger (37), the filter (28) of the indoor fan (14), Is clogged, the fin of the indoor heat exchanger (37) is dirty, or the fin of the indoor heat exchanger (37) is crushed.

  In addition, the inventor of this application has confirmed by simulation calculation that the magnitude | size of the value of the loss in an evaporator reflects the state of the fan which sends air to an evaporator. The result of the simulation calculation is shown in FIG. FIG. 7 shows the results of simulation calculation in three cases (10% reduction, 20% reduction, 30% reduction) in which the degree of fan airflow reduction is changed with reference to a predetermined value. In FIG. 7, the value of the loss in the evaporator increases as the degree of decrease in the fan air volume increases. Since the fan airflow decreases as the fan damage or malfunction progresses, it can be confirmed from FIG. 7 that the fan damage or malfunction progresses as the loss value in the evaporator increases.

  In addition, when the value of pressure loss in the indoor heat exchanger (37) at the time of diagnosis (value corresponding to the region of (g2)) is larger than the normal operating state (state shown in FIG. 8) Means that the pressure drop in the indoor heat exchanger (37) increases and the loss due to frictional heat generation increases. Therefore, the diagnosis unit (54) is in a state where the interior of the indoor heat exchanger (37) is dirty, a state where the piping of the indoor heat exchanger (37) is crushed, or the interior of the indoor heat exchanger (37). Diagnose that there are many foreign objects. The diagnosis unit (54) performs the same diagnosis even when the value of the frictional heat generation in the indoor heat exchanger (37) (value corresponding to the area of (g1)) is larger than the normal operating state. Do.

  In addition, the inventor of this application has confirmed by simulation calculation that the magnitude | size of the loss in an evaporator reflects the grade of the pressure loss of the refrigerant | coolant in an evaporator. The result of the simulation calculation is shown in FIG. FIG. 9 shows the result of the simulation calculation of three cases (0.01 MPa drop, 0.02 MPa drop, 0.03 MPa drop) in which the degree of the pressure drop of the refrigerant in the evaporator is changed based on a predetermined value. ing. In FIG. 9, the greater the degree of refrigerant pressure drop in the evaporator, the greater the loss in the evaporator. And since the pressure drop of the refrigerant | coolant in an evaporator represents the increase in the pressure loss of the refrigerant | coolant in an evaporator, it is confirmed from FIG. 9 that the pressure loss of the refrigerant | coolant in an evaporator is so large that the loss in an evaporator is large. .

  If the value of loss due to heat exchange in the outdoor heat exchanger (34) at the time of diagnosis (value corresponding to the area of (d)) is larger than normal operating conditions, the outdoor heat exchanger This means that the refrigerant condensing temperature in (34) is higher than in the normal operating state. Accordingly, the diagnosis unit (54) diagnoses that the air volume of the air passing through the outdoor heat exchanger (34) is reduced. Then, the diagnosis unit (54) determines that the outdoor fan (12) is in an aging state, the fins of the outdoor heat exchanger (34) are the cause of the decrease in the air volume of the air passing through the outdoor heat exchanger (34). Diagnose that it is dirty or the fins of the outdoor heat exchanger (34) are clogged with rust.

  In addition, the inventor of this application has confirmed by simulation calculation that the magnitude | size of the value of the loss in a condenser has reflected the state of the fan which sends air to a condenser. The result of the simulation calculation is shown in FIG. FIG. 10 shows the results of simulation calculation in three cases (10% reduction, 20% reduction, 30% reduction) in which the degree of fan airflow reduction is changed based on a predetermined value. In FIG. 10, the value of the loss in the condenser increases as the degree of decrease in the fan air volume increases. Since the fan air volume decreases as the fan damage or malfunction progresses, it can be confirmed from FIG. 10 that the fan damage or malfunction progresses as the loss value in the condenser increases.

  Also, if the value of the loss from the indoor heat exchanger (37) to the compressor (30) at the time of diagnosis (value corresponding to the area (i)) is larger than normal operating conditions This means that the amount of heat entering the pipe between the indoor heat exchanger (37) and the compressor (30) is large, or the pressure loss of the refrigerant in the pipe is large. Therefore, the diagnosis unit (54) has a large amount of foreign matter adhering to the inside of the pipe in a state where the heat insulating material of the pipe is deteriorated, the pipe is condensed, the pipe is crushed, or the like. Diagnose the condition.

  In addition, the value of loss due to heat dissipation from the compressor (30) to the outdoor heat exchanger (34) at the time of diagnosis (value corresponding to the area of (j)) is larger than in normal operating conditions. In this case, it means that the heat radiation amount in the pipe between the compressor (30) and the outdoor heat exchanger (34) is large. Therefore, the diagnosis unit (54) diagnoses that the heat insulating material of the pipe is deteriorated.

  In addition, when the pressure loss value from the compressor (30) to the outdoor heat exchanger (34) at the time of diagnosis is larger than the normal operating state (value corresponding to the area of (k)) Means that the pressure loss of the refrigerant in the pipe between the compressor (30) and the outdoor heat exchanger (34) is large. Therefore, the diagnosis unit (54) diagnoses that the pipe is in a collapsed state or a state in which foreign matter adhering to the inside of the pipe is increasing.

  The contents of the diagnosis results shown here are a part of the contents that can be diagnosed by the diagnosis unit (54).

  The display unit (55) displays the state of the diagnosis target component diagnosed by the diagnosis unit (54). Note that the display unit (55) may also display the value of loss generated in each circuit component. For example, as shown in FIG. 11, the display unit (55) displays the distribution status of the value of loss generated in each circuit component. Thereby, since the user can estimate the state of each circuit component, it becomes possible to detect the deterioration of the component and the aging deterioration at an early stage.

  Note that the area division of the Ts diagram shown in FIG. 2 is merely an example. For example, the area can be divided as shown in FIG. In FIG. 12A, the area (a) represents the work amount of the reverse Carnot cycle. The area (b) represents the endothermic amount in the indoor heat exchanger (37). The area (c) represents the loss that occurs in the indoor heat exchanger (37). The area (d) represents the loss that occurs in the outdoor heat exchanger (34). The region (e) represents the friction loss when the refrigerant passes through the expansion valve (36). The region (f) represents the loss due to mechanical friction in the compressor (30). In this case, since a Ts diagram is created from the temperature and entropy of the refrigerant at the four positions, the outdoor gas temperature sensor (45c), the outdoor gas pressure sensor (46c), the indoor gas temperature sensor (45f), and There is no need to provide an indoor fluid pressure sensor (46f).

  In the cooling operation, when the temperature (Tc) of the air sent to the indoor heat exchanger (37) is higher than the temperature (Th) of the air sent to the outdoor heat exchanger (34), Ts A diagram is represented as shown in FIG. In this case, the work of the reverse Carnot cycle represented by the area (a) becomes a negative value, and the area (c) and the area (d) overlap. The loss calculation unit (52) calculates the value of the loss generated in the indoor heat exchanger (37) from the area of the area (c), and the loss generated in the outdoor heat exchanger (34) from the area of the area (d). Is calculated. In the heating operation, when the indoor temperature (Tc) becomes lower than the outdoor temperature (Th), the work of the reverse Carnot cycle is treated as a negative value, and the outdoor heat exchanger (34) Calculate the value of the loss generated in the exchanger (37).

-Effect of Embodiment 1-
In this Embodiment 1, the magnitude | size of the energy change of the refrigerant | coolant produced in each circuit component is represented by the Ts diagram created using the temperature and entropy of the refrigerant | coolant in the exit of the main component apparatus and an inlet_port | entrance. Is used to individually calculate the magnitude of the refrigerant energy change that occurs in each of the circuit components. The magnitude of the refrigerant energy change that occurs in the circuit component represents, for example, the magnitude of the loss that occurs in the circuit component, and corresponds to the state of the circuit component. That is, according to the first embodiment, the state of the circuit component can be individually analyzed.

  In the first embodiment, the circuit component is used by using the magnitude of the refrigerant energy change generated in each circuit component corresponding to the state of the circuit component and the state of the fluid component (12, 14, 28). And the state of fluid components (12, 14, 28) are individually diagnosed. Since the diagnosis is performed in the same unit without using physical quantities of different units, the state of the circuit component and the state of the fluid component (12, 14, 28) can be quantitatively grasped. Accordingly, it is possible to accurately diagnose the state of the circuit component parts and the state of the fluid parts (12, 14, 28).

  Moreover, in this Embodiment 1, the loss value of the circuit component corresponding to all the area | regions represented with a Ts diagram was displayed, and the loss which arises in a refrigerating cycle was subdivided for every kind of loss. The change can be grasped about everything. For this reason, it is possible to perform loss analysis without missing. Therefore, the performance of the refrigeration apparatus (10) can be assured more reliably, which is advantageous in developing as an ESCO (Energy Service Company) business. Further, by performing loss analysis without missing, it becomes easy to detect an abnormality of the refrigeration apparatus (10) without omission, so that maintenance service of the refrigeration apparatus (10) can be improved.

  Further, according to the first embodiment, the state of the diagnosis target component is diagnosed based on the loss value of the normal operation state. For this reason, since the state of the diagnostic target part at the time of diagnosis can be grasped as a difference from the normal operating state, the state of the diagnostic target part can be accurately diagnosed.

  Further, in the first embodiment, a normal value is obtained by comparing the calculated value calculated by the loss calculating unit (52) with the loss reference value stored in the loss storing unit (53) for each loss generated in each circuit component. The difference between the operating state and the time of diagnosis is clearly grasped for each loss occurring in each circuit component. In addition, since a comparison is made for each loss occurring in each circuit component, the difference between the normal operating state and the time of diagnosis is clearly grasped even for a small loss of the refrigeration apparatus (10) as a whole. Therefore, it is possible to more accurately diagnose the state of the diagnosis target component.

  In the first embodiment, the diagnosis means (54) uses a plurality of subdivided loss values for the loss generated in the outdoor heat exchanger (34) and the indoor heat exchanger (37). The conditions of the outdoor heat exchanger (34) and the indoor heat exchanger (37), and the fans (12, 14) and the filter (28) which are fluid components (12, 14, 28) are diagnosed. Therefore, the state of the outdoor heat exchanger (34) and the indoor heat exchanger (37) and the state of the fans (12, 14) and the filter (28) can be grasped in more detail. The diagnosis of the condition can be performed more accurately.

  Further, in the first embodiment, the diagnosis of the state of the diagnosis target part is diagnosed if there is no loss reference value under the same operation condition as the operation state at the time of diagnosis in which the loss calculation unit (52) calculates the calculated value or the same. Sometimes the closest operating reference loss criterion is used. Accordingly, the difference between the operating condition of the loss reference value and the operating condition at the time of diagnosis is reduced among the difference in loss value between the normal operating state and the time of diagnosis. And since the difference in the value of loss between the normal operating state and the time of diagnosis more accurately represents the difference in the state of the parts to be diagnosed between the normal operating state and the time of diagnosis, further diagnosis of the state of the parts to be diagnosed It can be done accurately.

-Modification of Embodiment 1-
A modification of the first embodiment will be described. In the refrigeration apparatus (10) of this modification, a so-called supercritical cycle is performed in the refrigerant circuit (20). The supercritical cycle is a refrigeration cycle in which the high pressure is set to a value higher than the critical pressure of the refrigerant. The refrigerant circuit (20) is filled with, for example, carbon dioxide as a refrigerant. In this refrigeration apparatus (10), the compressor (30) compresses carbon dioxide so as to be higher than its critical pressure.

  In the Ts diagram of the refrigeration cycle in the refrigerant circuit (20) of this modification, the relationship between the temperature of the refrigerant and the entropy from the inlet to the outlet of the condenser changes on the curve as shown in FIG. . In FIG. 13, the area (a) represents the work amount of the reverse Carnot cycle. The area (b) represents the endothermic amount in the indoor heat exchanger (37). The area (c) represents the loss that occurs in the indoor heat exchanger (37). The area (d) represents the loss that occurs in the outdoor heat exchanger (34). The region (e) represents the friction loss when the refrigerant passes through the expansion valve (36). The region (f) represents the loss due to mechanical friction in the compressor (30).

  About operation | movement when the controller (50) of this modification diagnoses the state of a diagnostic object component, it is the same as that of the said Embodiment 1. FIG.

<< Embodiment 2 of the Invention >>
A second embodiment of the present invention will be described. Embodiment 2 is a refrigeration apparatus (10) according to the present invention.

-Configuration of refrigeration equipment-
As shown in FIG. 14, the refrigeration apparatus (10) of Embodiment 2 is an air conditioner that includes two indoor units, a first indoor unit (13a) and a second indoor unit (13b). The number of indoor units (13) is merely an example. Hereinafter, differences from the first embodiment will be described.

《Outdoor unit》
The outdoor circuit (21) of the outdoor unit (11) includes a compressor (30), an outdoor heat exchanger (34) that is a heat source side heat exchanger, a first outdoor expansion valve (36a) that is a pressure reducing means, A two-outdoor expansion valve (36b) is provided as a main component, and in addition, a four-way switching valve (33) and an internal heat exchanger (15) are provided. These main components, the four-way switching valve (33), and the internal heat exchanger (15) constitute circuit components and are connected to each other by refrigerant piping that also constitutes the circuit components.

  In the outdoor circuit (21), the liquid pipe (42) extending from the outdoor heat exchanger (34) branches into two, an indoor connection pipe (17) and a bypass pipe (16). The indoor connection pipe (17) is connected to the liquid side stop valve (25). The bypass pipe (16) is connected to the suction pipe (41). The first outdoor expansion valve (36a) is provided in the liquid pipe (42), and the second outdoor expansion valve (36b) is provided in the bypass pipe (16).

  The internal heat exchanger (15) includes a first flow path (15a) provided in the middle of the indoor connection pipe (17) and a second flow path (15b) provided in the middle of the bypass pipe (16). Yes. The second flow path (15b) is located closer to the suction pipe (41) than the second outdoor expansion valve (36b). In the internal heat exchanger (15), the first flow path (15a) and the second flow path (15b) are arranged adjacent to each other, and the refrigerant in the first flow path (15a) and the second flow path (15b) ) Refrigerant for heat exchange.

  The outdoor circuit (21) includes a temperature sensor (45a) and a pressure sensor (46a) on the inlet side of the compressor (30), and a temperature sensor (45b) and a pressure sensor (46a) on the outlet side of the compressor (30). 46b) is provided. The liquid pipe (42) is provided with a first outdoor liquid temperature sensor (45c), and the indoor connection pipe (17) is provided with a second outdoor liquid temperature sensor (45d). In the bypass pipe (16), the third outdoor liquid temperature sensor (45i) is provided on the upstream side of the second flow path (15b), and the first outdoor gas temperature sensor (45j) is provided on the downstream side of the second flow path (15b). ) Is provided. A second outdoor gas temperature sensor (45k) is provided between the second port (P2) of the four-way selector valve (33) and the gas-side closing valve (26).

《Indoor unit》
The first indoor unit (13a) is provided with a first indoor circuit (22a), and the second indoor unit (13b) is provided with a second indoor circuit (22b). The first indoor circuit (22a) and the second indoor circuit (22b) have the same configuration.

  Each indoor circuit (22a, 22b) is provided with an indoor expansion valve (39a, 39b) as a decompression means and an indoor heat exchanger (37a, 37b) as a use side heat exchanger as main components. . The indoor expansion valves (39a, 39b) and the indoor heat exchangers (37a, 37b) constitute circuit components.

  Indoor fans (14a, 14b) are provided in the vicinity of the indoor heat exchangers (37a, 37b). A filter (28) is provided between the indoor fan (14a, 14b) and the indoor heat exchanger (37a, 37b). The indoor fan (14) and the filter (28) constitute fluid components (12, 14, 28) through which air that exchanges heat with the refrigerant in the indoor heat exchanger (37) flows.

  In the first indoor unit (13a), an indoor liquid temperature sensor (45e) is provided on the liquid side of the indoor heat exchanger (37a), and an indoor gas temperature sensor (45f) is provided on the gas side of the indoor heat exchanger (37a). Is provided. In the second indoor unit (13b), an indoor liquid temperature sensor (45g) is provided on the liquid side of the indoor heat exchanger (37b), and an indoor gas temperature sensor (45h) is provided on the gas side of the indoor heat exchanger (37b). ) Is provided.

"controller"
As in the first embodiment, the controller (50) diagnoses the state of the components of the refrigeration apparatus (10) based on a thermodynamic analysis that analyzes losses generated in each circuit component. Diagnosis target parts diagnosed by the controller (50) are circuit component parts including main components and fluid parts (12, 14, 28, 75, 76b). The controller (50) is configured to perform thermodynamic analysis on each of branch circuits (67) described later.

  The controller (50) includes a refrigerant state detection unit (51), a loss calculation unit (52), a loss storage unit (53), a diagnosis unit (54), and a display unit (55) similar to those in the first embodiment. The flow rate calculation unit (56) is provided. The flow rate calculation unit (56) constitutes a flow rate calculation means. The flow rate calculation unit (56) is configured to calculate the refrigerant flow rate of each indoor circuit (22) and the refrigerant flow rate of the bypass pipe (16) as the refrigerant flow rate of a branch circuit (67) described later. Hereinafter, only the configuration of the flow rate calculation unit (56) will be described.

Specifically, the flow rate calculation unit (56), the proportion of the refrigerant flow rate G ₁ of the first indoor circuit (22a) occupies the refrigerant circulation amount G of the refrigerant circuit (20) (G ₁ / G), a second indoor circuit ( 22b) the ratio (G ₂ / G) of the refrigerant flow rate G ₂ to the refrigerant circulation amount G of the refrigerant circuit (20), and the refrigerant flow rate G ₃ of the bypass pipe (16) is the refrigerant circulation amount G of the refrigerant circuit (20). It calculates the ratio (G ₃ / G) occupying the refrigerant circulation amount of the refrigerant circuit (20) G is calculated (the compressor (30) is the flow rate of the refrigerant discharged). Each indoor circuit (22) or the bypass pipe (16) ratio of occupying the refrigerant circulation amount G of the refrigerant circuit _{(20) (G 1 / G} , G 2 / G, G 3 / G) in the refrigerant circuit (20) by multiplying the refrigerant circulation volume G of, calculates the refrigerant flow rate G ₃ of the refrigerant flow rate G ₂ and the bypass pipe of the refrigerant flow rate G ₁ and the second indoor circuit of the first indoor circuit (22a) (22b) (16 ) respectively To do.

The ratio (G ₁ / G) of the refrigerant flow rate G _{1 in} the first indoor circuit (22a) to the refrigerant circulation amount G in the refrigerant circuit (20) is calculated using Equation 3 below. Further, the ratio (G ₂ / G) that the refrigerant flow rate G _{2 of} the second indoor circuit (22b) occupies in the refrigerant circulation amount G of the refrigerant circuit (20) is calculated using Expression 4 shown below. The ratio (G ₃ / G) that the refrigerant flow rate G ₃ of the bypass pipe (16) occupies in the refrigerant circulation amount G of the refrigerant circuit (20) is calculated using Equation 5 shown below.
Equation _{3: G 1 / G = (} h 4 -h 3) × (h 5 -h 2) / (h 5 -h 3) / (h 1 -h 2)
Formula _{4: G 2 / G = (} h 4 -h 3) × (h 5 -h 1) / (h 5 -h 3) / (h 2 -h 1)
Equation _{5: G 3 / G = (} h 4 -h 5) / (h 3 -h 5)

In the above formula 3 to formula 5, h ₁ is the indoor heat exchanger of the first indoor circuit indoor heat exchanger (22a) downstream of the enthalpy of the refrigerant (37a), h ₂ is the second indoor circuit (22b) (37b downstream of the enthalpy of the refrigerant), h ₃ is the refrigerant and the second indoor circuit (22b downstream of the enthalpy of the refrigerant in the internal heat exchanger (15) of the bypass pipe (16), h ₄ is the first indoor circuit (22a) enthalpy of the refrigerant before the refrigerant joins the bypass pipe joins the refrigerant (16) in), h ₅ is a bypass pipe to the refrigerant of the refrigerant and the second indoor circuit of the first indoor circuit (22a) (22b) The enthalpies of the refrigerant after the refrigerant of (16) merges are shown respectively.

In the circuit shown in FIG. 15, the above Equations 3 to 5 are expressed by Equations 8 and 9 in which the refrigerant flow rates of the two circuits (91 and 92) to be joined are derived from Equations 6 and 7 shown below. It has been created using that.
Equation _{6: G A × h A +} G B × h B = ht × Gt
Equation 7: G _A + G _B = G t
Equation _{8: G A / (G A} + G B) = (ht-h B) / (h A -h B)
Equation _{9: G B / (G A} + G B) = (ht-h A) / (h 2 -h A)

In Equation 9 from the above equation 6, G _A refrigerant flow rate of the refrigerant flow rate of the one of the first circuit of the two circuits to be merged (91 and 92) (91), G _B is the other of the second circuit (92), Gt is the refrigerant flow rate of the merge circuit (93) after the merge of the first circuit (91) and the second circuit (92), h _A is the enthalpy of refrigerant in the first circuit (91), and h _B is the second circuit ( The refrigerant enthalpy and ht in (92) represent the refrigerant enthalpy in the junction circuit (93), respectively.

Moreover, the refrigerant | coolant circulation amount G of a refrigerant circuit (20) is calculated using the formula 10 shown below.
Formula 10: G = W / (h _H −h _L )

In Formula 10, W represents the input power of the compressor (30), h _H represents the enthalpy of the refrigerant discharged from the compressor (30), and h _L represents the enthalpy of the refrigerant sucked by the compressor (30).

-Operation of refrigeration equipment-
Next, the operation of the refrigeration apparatus (10) will be described.

<Cooling operation>
In the cooling operation, the four-way switching valve (33) is set to the second state. When the compressor (30) is operated in this state, in the refrigerant circuit (20), the outdoor heat exchanger (34) becomes a condenser (radiator) and the indoor heat exchanger (37) becomes an evaporator. A compression refrigeration cycle is performed. In the cooling operation, the first outdoor expansion valve (36a) is set to fully open, and the opening degrees of the second outdoor expansion valve (36b) and the indoor expansion valves (39a, 39b) are adjusted as appropriate.

  In the cooling operation, the main circuit (66) is configured from the junction of the bypass pipe (16) in the suction pipe (41) to the branch point of the bypass pipe (16) in the liquid pipe (42). The main circuit (66) is a range from a location where all of the refrigerant returning to the compressor (30) has joined to a location where the refrigerant discharged from the compressor (30) first branches. Further, the bypass pipe (16) and each indoor circuit (22a, 22b) constitute a branch circuit (67). The branch circuit (67) is connected in parallel to the main circuit (66).

  Specifically, the refrigerant discharged from the compressor (30) is condensed by exchanging heat with outdoor air in the outdoor heat exchanger (34). The refrigerant condensed in the outdoor heat exchanger (34) branches into the indoor connection pipe (17) and the bypass pipe (16). The refrigerant flowing into the indoor connection pipe (17) flows through the first flow path (15a) of the internal heat exchanger (15). On the other hand, the refrigerant flowing into the bypass pipe (16) is decompressed by the second outdoor expansion valve (36b) and then flows into the second flow path (15b) of the internal heat exchanger (15). In the internal heat exchanger (15), heat exchange is performed between the refrigerant in the first flow path (15a) and the refrigerant in the second flow path (15b). By this heat exchange, the refrigerant in the first channel (15a) is cooled, and the refrigerant in the second channel (15b) is heated.

  The refrigerant flowing through the first flow path (15a) is distributed to each indoor circuit (22a, 22b). In each indoor circuit (22), the refrigerant is depressurized when passing through the indoor expansion valve (39), and then is evaporated by exchanging heat with indoor air in the indoor heat exchanger (37). The refrigerant evaporated in the indoor heat exchanger (37) merges with the refrigerant flowing through the bypass pipe (16), and is sucked into the compressor (30) and compressed.

<Heating operation>
In the heating operation, the four-way switching valve (33) is set to the first state. When the compressor (30) is operated in this state, in the refrigerant circuit (20), the outdoor heat exchanger (34) serves as an evaporator and the indoor heat exchanger (37) serves as a condenser (heat radiator). A compression refrigeration cycle is performed. In the heating operation, the second outdoor expansion valve (36b) is set to be fully closed, and the opening degrees of the first outdoor expansion valve (36a) and the indoor expansion valves (39a, 39b) are appropriately adjusted.

  In the heating operation, the indoor circuit (22), the liquid side connection pipe (23) and the gas side connection pipe (24) constitute the main circuit (66). Each indoor circuit (22a, 22b) constitutes a branch circuit (67).

  Specifically, the refrigerant discharged from the compressor (30) is distributed to each indoor circuit (22a, 22b). In each indoor circuit (22), the refrigerant exchanges heat with indoor air in the indoor heat exchanger (37) and condenses. The refrigerant condensed in the indoor heat exchanger (37) is depressurized when passing through the indoor expansion valve (39) and the first outdoor expansion valve (36a), and then the outdoor heat exchanger (34) heats the outdoor air and heat. Exchange and evaporate. The refrigerant evaporated in the outdoor heat exchanger (34) is sucked into the compressor (30) and compressed.

-Controller operation-
The operation when the controller (50) diagnoses the state of the part to be diagnosed will be described. The diagnosis of the state of the diagnosis target component is performed during the cooling operation or the heating operation. Below, the case where a diagnosis is performed during the cooling operation will be described.

  In the cooling operation, the controller (50) performs thermodynamic analysis on each of the indoor circuits (22a, 22b) and the bypass pipe (16). First, the thermodynamic analysis about each indoor circuit (22a, 22b) is demonstrated. Hereinafter, a thermodynamic analysis of the first indoor circuit (22a) will be described. Since the thermodynamic analysis of the second indoor circuit (22b) is the same as the thermodynamic analysis of the first indoor circuit (22a), the description thereof is omitted.

  In the thermodynamic analysis of the first indoor circuit (22a), the refrigerant state detector (51) includes an inlet and an outlet of the compressor (30), an inlet and an outlet of the outdoor heat exchanger (34), an internal heat exchanger ( The temperature and entropy of the refrigerant at 10 positions of the inlet and outlet of 15), the inlet and outlet of the indoor expansion valve (39), and the inlet and outlet of the indoor heat exchanger (37) are detected.

  In Embodiment 2, the refrigerant temperature and entropy are the same at the outlet of the compressor (30) and the inlet of the outdoor heat exchanger (34), and the outlet of the outdoor heat exchanger (34) is exchanged with the internal heat. Of the internal heat exchanger (15) and the inlet of the indoor expansion valve (39), and the outlet of the indoor expansion valve (39) and the indoor heat exchanger ( It is assumed that the entrance is the same at 37). Further, at the outlet of the outdoor heat exchanger (34) and the outlet of the internal heat exchanger (15), entropy is calculated assuming that the refrigerant pressure is equal to the outlet of the compressor (30), and the indoor heat exchanger (37 ), The entropy is calculated assuming that the refrigerant pressure is equal to the inlet of the compressor (30).

  Next, the loss calculation unit (52) uses the refrigerant temperature and entropy detected by the refrigerant state detection unit (51) to compress the compressor (30), the outdoor heat exchanger (34), and the internal heat exchanger (15 ), The value of the loss generated in each circuit component (main component device) of the indoor expansion valve (39) and the indoor heat exchanger (37).

  Here, FIG. 16A shows a Ts diagram created by the thermodynamic analysis of the first indoor circuit (22a). In FIG. 16 (A), point A (1) corresponds to the state of refrigerant at the inlet of the compressor (30), and point B (1) corresponds to the outlet of the compressor (30) (outdoor heat exchanger (34)). Point K (1) corresponds to the refrigerant state at the outlet of the outdoor heat exchanger (34) (inlet of the internal heat exchanger (15)), and point D (1) corresponds to the refrigerant state at the inlet) Corresponding to the state of the refrigerant at the outlet of the internal heat exchanger (15) (inlet of the indoor expansion valve (39)), point E (1) is the inlet of the indoor heat exchanger (37) (exit of the indoor expansion valve (39)) The point F (1) corresponds to the refrigerant state at the outlet of the indoor heat exchanger (37).

  G (1) is a point where the isobaric line passing through the point B (1) and the saturated vapor line intersect. Point H (1) is a point where the isobaric line passing through point D (1) and the saturated liquid line intersect. Point I (1) is the point where the isoenthalpy line passing through point D (1) and the saturated liquid line intersect. Point J (1) is a point where the isobaric line passing through point F (1) and the saturated vapor line intersect.

  In FIG. 16A, the area (a) represents the work amount of the reverse Carnot cycle, the area (b) represents the heat absorption amount in the indoor heat exchanger (37), and the area (c) This represents the loss in the heat exchanger (37), the area (d) represents the loss in the outdoor heat exchanger (34), and the area (e) represents the friction loss when the refrigerant passes through the indoor expansion valve (39). (F) represents the loss due to mechanical friction in the compressor (30), (l) represents the loss in the internal heat exchanger (15), and (m) represents the indoor heat exchanger (37). ) And the intrusion heat in the pipe between the compressor (30), and the area (r) represents the heat exchange loss in the pipe between the indoor heat exchanger (37) and the compressor (30).

  (A), (d), (f), (l), (m), and (r) representing the loss of circuit components of the main circuit (66) Each area of the region represents the magnitude of the loss corresponding to the refrigerant flow rate flowing into the indoor circuit (22) in the refrigerant flow rate of the main circuit (66) as a value per unit flow rate of the refrigerant.

  Subsequently, a thermodynamic analysis of the bypass pipe (16) will be described.

  In the thermodynamic analysis of the bypass pipe (16), the refrigerant state detector (51) includes an inlet and an outlet of the compressor (30), an inlet and an outlet of the outdoor heat exchanger (34), and the second outdoor expansion valve (36b). ) And the temperature and entropy of the refrigerant at eight positions of the inlet and outlet of the internal heat exchanger (15).

  In the second embodiment, the refrigerant temperature and entropy are equal at the outlet of the compressor (30) and the inlet of the outdoor heat exchanger (34), and the outlet of the outdoor heat exchanger (34) and the second outdoor The inlet of the expansion valve (36b) is the same, and the outlet of the second outdoor expansion valve (36b) and the inlet of the internal heat exchanger (15) are the same. The entropy is calculated at the outlet of the outdoor heat exchanger (34) assuming that the refrigerant pressure is equal to the outlet of the compressor (30), and the refrigerant pressure is calculated at the inlet and outlet of the internal heat exchanger (15). The entropy is calculated as being equal to the inlet of the compressor (30).

  Next, the loss calculation unit (52) uses the refrigerant temperature and entropy detected by the refrigerant state detection unit (51) to use the compressor (30), the outdoor heat exchanger (34), the second outdoor expansion valve ( 36b), and the value of loss generated in each circuit component (main component) of the internal heat exchanger (15) is calculated individually.

  Here, the Ts diagram created by the thermodynamic analysis of the bypass pipe (16) is shown in FIG. In FIG. 16 (B), point A (1) corresponds to the state of the refrigerant at the inlet of the compressor (30), and point B (1) is the outlet of the compressor (30) (of the outdoor heat exchanger (34)). Point D (1) corresponds to the refrigerant state at the outlet of the outdoor heat exchanger (34) (inlet of the second outdoor expansion valve (36b)), and point D (1) corresponds to the refrigerant state at the inlet). Corresponds to the state of the refrigerant at the inlet of the internal heat exchanger (15) (the outlet of the second outdoor expansion valve (36b)), and point F (1) indicates the state of the refrigerant at the outlet of the internal heat exchanger (15). It corresponds. Note that G (1), points H (1), I (1), and point J (1) are the same as the thermodynamic analysis of the indoor circuit (22).

  In FIG. 16B, the area (b) represents the amount of heat absorbed in the internal heat exchanger (15), the area (c) represents the loss in the internal heat exchanger (15), and The region represents the loss in the outdoor heat exchanger (34), the region (e) represents the friction loss when the refrigerant passes through the second outdoor expansion valve (36b), and the region (f) represents the compressor (30 ) Represents the loss due to mechanical friction, the area (m) represents the amount of heat entering the pipe between the internal heat exchanger (15) and the compressor (30), and the area (r) represents the internal heat exchanger (15 ) And the heat exchange loss in the pipe between the compressor (30). The area (d), the area (f), the area (m), and the area (r) representing the loss of circuit components of the main circuit (66) are the refrigerant flow rate of the main circuit (66). Among them, the magnitude of the loss corresponding to the refrigerant flow rate of the bypass pipe (16) is expressed as a value per unit flow rate of the refrigerant.

  The loss calculation unit (52) calculates the value of loss generated in each circuit component based on the thermodynamic analysis for each indoor circuit (22a, 22b) and the thermodynamic analysis for the bypass pipe (16). calculate. Specifically, for the circuit components of each indoor circuit (22a, 22b) and bypass pipe (16) that are branch circuits (67), the loss calculation unit (52) has a circuit component for calculating the value of loss. In the Ts diagram of the provided branch circuit (67), the area of the region corresponding to the loss generated in the circuit component is calculated. The area of this region represents the magnitude of the loss generated in the circuit component as a value per unit flow rate of the refrigerant. The loss calculation unit (52) multiplies the area of the region corresponding to the circuit component by the refrigerant flow rate of the branch circuit (67) calculated by the flow rate calculation unit (56), thereby setting the circuit configuration of the branch circuit (67). The component loss value is calculated as the work amount.

For the circuit components of the main circuit (66), the loss calculator (52) responds to the loss in the circuit components that calculate the loss value in the Ts diagram of each branch circuit (67). The area of each area to be calculated is calculated. In the Ts diagram of each branch circuit (67), the area of the region corresponding to the circuit component corresponds to the refrigerant flow rate of the branch circuit (67) out of the refrigerant flow rate of the main circuit (66). Is expressed as a value per unit flow rate of the refrigerant. The loss calculation unit (52) is obtained by multiplying the calculated area of the Ts diagram of each branch circuit (67) by the refrigerant flow rate of each branch circuit (67) calculated by the flow rate calculation unit (56). By summing up, the value of the loss of the circuit components of the main circuit (66) is calculated as work (see Equation 11).
Formula 11: R = ΣA × G _X

In the above equation 11, R represents the loss value of the circuit component of the main circuit (66), and A represents the loss generated in the circuit component of the main circuit (66) in the Ts diagram of the branch circuit (67). represents the area of the corresponding region, G _X represents a refrigerant flow branch circuit which calculates the value of a (67).

  As in the first embodiment, the diagnosis unit (54), among the plurality of operation condition loss reference values stored in the loss storage unit (53), calculates the loss reference value of the operation condition corresponding to the operation condition at the time of diagnosis. select. Then, the diagnosis unit (54) compares the calculated value calculated by the loss calculation unit (52) with the loss reference value of the selected operating condition for each loss occurring in each circuit component. Diagnose the condition of fluid parts (12, 14, 28, 75, 76b).

-Modification of Embodiment 2-
A modification of the second embodiment will be described. As shown in FIG. 17, the refrigeration apparatus (10) of this modification includes two outdoor units, a first outdoor unit (11a) and a second outdoor unit (11b). The first outdoor unit (11a) and the second outdoor unit (11b) are connected in parallel to each other. The number of outdoor units (11) is merely an example.

  The first outdoor unit (11a) accommodates the first outdoor circuit (21a), and the second outdoor unit (11b) accommodates the second outdoor circuit (21b). The first outdoor circuit (21a) and the second outdoor circuit (21b) have the same configuration. As shown in FIG. 18, each outdoor circuit (21) has the same configuration as the outdoor circuit of the second embodiment except that two compressors (30a, 30b) are provided. The two compressors (30a, 30b) are connected in parallel to each other. One of the two first compressors (30a) is a variable capacity compressor, and the other second compressor (30b) is a constant capacity compressor.

  The refrigeration apparatus (10) of this modification includes three indoor units, a first indoor unit (13a), a second indoor unit (13b), and a third indoor unit (13c). The first indoor unit (13a) contains the first indoor circuit (22a), the second indoor unit (13b) contains the second indoor circuit (22b), and the third indoor unit (13c) contains the second indoor circuit (22a). Three indoor circuits (22c) are accommodated. Further, in each of the liquid side connecting pipe (23) and the gas side connecting pipe (24), between the first indoor circuit (22a) and the second indoor circuit (22b), and outside the first indoor circuit (22a). Temperature sensors (45m, 45n, 45p, 45q) are provided on the circuit (21) side, respectively.

  In this modification, during the cooling operation in which the second outdoor expansion valve (36a) is opened, in each outdoor circuit (21), from the junction of the bypass pipe (16) in the suction pipe (41) The main circuit (66) constitutes the branch point of the bypass pipe (16) in the liquid pipe (42). The bypass pipe (16) and each indoor circuit (22a, 22b, 22c) constitute a branch circuit (67). Each indoor circuit (22a, 22b, 22c) is connected in parallel to the main circuit (66) of the first outdoor circuit (21a) and to the main circuit (66) of the second outdoor circuit (21b). ing.

  On the other hand, during the heating operation in which the second outdoor expansion valve (36a) is closed, each outdoor circuit (21) constitutes the main circuit (66), and each indoor circuit (22a, 22b, 22c) A branch circuit (67) is formed. Each indoor circuit (22a, 22b, 22c) is connected in parallel to both the first outdoor circuit (21a) and the second outdoor circuit (21b).

The controller (50) has the same refrigerant state detection unit (51), loss calculation unit (52), loss storage unit (53), diagnosis unit (54), display unit (55), and flow rate calculation as in the second embodiment. Part (56). The flow rate calculation unit (56) of this modification example uses the refrigerant flow rate (G ₁ , G ₂ , G ₃ ) of each indoor circuit (22) according to the formula created using Formula 8 and Formula 9 as in the second embodiment. ) And the refrigerant flow rate (G _b1 , G _b2 ) of the bypass pipe (16) of each outdoor circuit (21).

Furthermore, in this modification, the flow rate calculation unit (56) sets the refrigerant flow rate (G) flowing from the first outdoor circuit (21a) for the refrigerant flow rate (G ₁ , G ₂ , G ₃ ) of each indoor circuit (22). _{1-1, G 2-1, G 3-1)} and refrigerant flow rate _{(G 1-2} which has flowed from the second outdoor circuit (21b), _{G 2-2,} configured to calculate the _{G 3-2)} and Has been. For example, the refrigerant flow rate (G _1-1 ) flowing from the first outdoor circuit (21a) out of the refrigerant flow rate (G ₁ ) of the first indoor circuit (22a) is calculated by the following equation (12).
Equation _{12: G 1-1 = G 1 ×} G mA / (G mA + G mB)

In Equation 12, G _mA represents the refrigerant flow rate flowing out from the first outdoor circuit (21a), and G _mB represents the refrigerant flow rate flowing out from the second outdoor circuit (21b). These refrigerant flow rates (G _mA , G _mB ) are calculated by the flow rate calculation unit (56) using equations 13 and 14 shown below.
Formula 13: G _mA = (G _Inv−A + G _Std−A ) −G _b1
Equation _{14: G mB = (G Inv} -B + G Std-B) -G b2

In the above formulas 13 and 14, G _Inv represents the refrigerant flow rate discharged from the first compressor (30a), and G _Std represents the refrigerant flow rate discharged from the second compressor (30b). These refrigerant flow rates (G _Inv , G _Std ) are calculated by the flow rate calculation unit (56) using Equation 10 above.

  The controller (50) performs thermodynamic analysis on each of the indoor circuits (22a, 22b, 22c) and the bypass pipes (16) of the outdoor circuits (21a, 21b). The operation of the controller (50) in the thermodynamic analysis for each indoor circuit (22) and the operation of the controller (50) in the thermodynamic analysis for the bypass pipe (16) of each outdoor circuit (21) are as described in the second embodiment. Is the same. The T-s diagram created by the thermodynamic analysis of each indoor circuit (22) is represented by FIG. 16 (A), and is created by the thermodynamic analysis of the bypass pipe (16) of the outdoor circuit (21). The T-s diagram is represented by FIG.

  In this modification, the operation of calculating the value of loss generated in the circuit components of the main circuit (66) in the loss calculation unit (52) is different from that of the second embodiment. Since the operation for calculating the value of the loss generated in the circuit components of the branch circuit (67) is the same as that of the second embodiment, the description thereof is omitted. Below, the operation | movement which calculates the value of the loss which arises in the circuit component of a 1st outdoor circuit (21a) among the circuit components of a main circuit (66) is demonstrated.

The loss calculation unit (52) calculates the value of loss generated in the circuit components of the main circuit (66), specifically, the compressor (30), the outdoor heat exchanger (34), and the first outdoor expansion valve (36a). The calculation is performed using Equation 15 shown below.
Formula 15: R = ΣB × G _Y + C × G _b1

In the above equation 15, R represents the loss value of the circuit components of the main circuit (66), and B represents the loss generated in the circuit components of the main circuit (66) in the Ts diagram of the indoor circuit (22). represents the area of the corresponding region, _{G Y} refrigerant flow rate _{(G 1-1} flowing from the first outdoor circuit to the indoor circuit (22) calculating the value of _{B (21a), G 2-1,} G 3 _-1 ), and C represents the area of a region corresponding to the circuit component of the main circuit (66) in the Ts diagram of the bypass pipe (16) of the first outdoor circuit (21a).

In the above formula 15, the value of the loss generated in the compressor (30) is calculated as the sum of the loss generated in the first compressor (30a) and the loss generated in the second compressor (30b). The loss calculation unit (52) discharges the value of loss generated in the compressor (30) from the refrigerant flow rate G _Inv-A discharged from the first compressor (30a) and from the second compressor (30b). By allocating using the ratio with the refrigerant flow rate G _Std-A , the value of the loss generated in each compressor (30a, 30b) is calculated.

<< Embodiment 3 of the Invention >>
Embodiment 3 of the present invention will be described. Embodiment 3 is a refrigeration apparatus (10) according to the present invention. This refrigeration apparatus (10) is configured as a refrigeration apparatus having a hot water supply function.

  Specifically, as shown in FIG. 19, the refrigeration apparatus (10) includes a water circulation circuit (75) through which water flows, and heat exchange between water in the water circulation circuit (75) and refrigerant in the refrigerant circuit (20). And a hot water supply heat exchanger (76) for heating. The water circulation circuit (75) constitutes fluid parts (12, 14, 28, 75, 76b). Tap water circulates in the water distribution circuit (75). The refrigerant circuit (20) is filled with carbon dioxide as a refrigerant. This refrigeration apparatus (10) is configured such that a supercritical cycle is performed in the refrigerant circuit (20), as in the modification of the first embodiment.

  The hot water supply heat exchanger (76) includes a first flow path (76a) provided in the refrigerant circuit (20) and a second flow path (76b) provided in the water circulation circuit (75). The second channel (76b) constitutes a fluid component (12, 14, 28, 75, 76b). In the hot water supply heat exchanger (76), the first flow path (76a) and the second flow path (76b) are arranged adjacent to each other. In addition, the hot water supply heat exchanger (76) has the first channel (76a) outlet and the second channel (76b) outlet on the same side, and the first channel (76a) outlet and the second channel (76a). It is configured in a counterflow type in which the inlet of the channel (76b) is on the same side.

  In the hot water supply heat exchanger (76), heat exchange is performed between the refrigerant in the first flow path (76a) and the water in the second flow path (76b). By this heat exchange, the high-pressure and high-temperature refrigerant in the first channel (76a) is cooled, and the water in the second channel (76b) is heated.

  In the Ts diagram of the refrigeration cycle in the refrigerant circuit (20) of the third embodiment, as shown in FIG. 20, the region (a), the region (e), and the region (f) with respect to the region (d). The boundary line with the region is inclined by the temperature difference between the water temperature (Tin) at the inlet of the second channel (76b) and the water temperature (Tout) at the outlet of the second channel (76b). Since the hot water supply heat exchanger (76) is configured in a counterflow manner, unlike the first and second embodiments, the refrigerant (water) in which the refrigerant in the first flow path (76a) exchanges heat is used. This is because the temperature decreases as it approaches the outlet.

  In FIG. 20, the area (a) represents the work amount of the reverse Carnot cycle. The area (b) represents the endothermic amount in the indoor heat exchanger (37). The area (c) represents the loss that occurs in the indoor heat exchanger (37). The region (d) represents the loss that occurs in the first flow path (76a). The region (e) represents the friction loss when the refrigerant passes through the expansion valve (36). The region (f) represents the loss due to mechanical friction in the compressor (30).

  In the third embodiment, the controller (50) uses the water circulation circuit (75) and the hot water supply heat exchanger (76) as diagnostic target components in addition to the diagnostic target components of the first and second embodiments. . The loss that occurs in the first flow path (76a) reflects the state of heat exchange in the hot water supply heat exchanger (76), and not only the state of the first flow path (76a) but also the second flow path (76b). ) And water circulation circuit (75). The diagnosis unit (54) diagnoses the state of the second channel (76b) and the state of the water circulation circuit (75) based on the value of the loss generated in the first channel (76a).

<< Embodiment 4 of the Invention >>
Embodiment 4 of the present invention will be described. The fourth embodiment is an analyzer (60) of the refrigeration apparatus (10) according to the present invention. The analyzer (60) is configured to analyze the state of the refrigeration apparatus (10) as in the first embodiment, the second embodiment, and the third embodiment, and diagnose the state of the components.

-Configuration of analyzer-
As shown in FIG. 21, the analyzer (60) according to the fourth embodiment of the present invention includes a first component (47) and a second component (48) connected to each other via a communication line (63). ing.

  The first component (47) includes a refrigerant state detection sensor (65). The refrigerant state detection sensor (65) is a sensor for detecting the refrigerant state of the refrigerant circuit (20) necessary for detecting the refrigerant temperature and entropy at the outlet and inlet of each main component device. Specifically, the refrigerant state detection sensor (65) includes six temperature sensors (45) and six pressure sensors (46) at the same position as the refrigerant circuit (20) of the first embodiment.

  The second component (48) includes a refrigerant state detection unit (51), a loss calculation unit (52), a loss storage unit (53), a diagnosis unit (54), and a display unit (55). The second component (48) is configured as an electronic computer and is provided in a building different from the refrigeration apparatus (10). The refrigerant state detection unit (51), the loss calculation unit (52), the loss storage unit (53), the diagnosis unit (54), and the display unit (55) are substantially the same as those in the first embodiment. Description of these configurations and operations will be omitted.

  The analyzer (60) of the fourth embodiment diagnoses the state of the parts to be diagnosed (circuit components and fluid parts (12, 14, 28, 75, 76b)) for each of the connected refrigeration apparatuses (10). Is configured to do. At that time, the measurement value of the refrigerant state detection sensor (65) is transmitted from the first component (47) to the second component (48). The refrigerant state detection unit (51) uses the measurement value of the temperature sensor (45) and the measurement value of the pressure sensor (46) transmitted from the first component unit (47) to each main component of the refrigeration apparatus (10). Detect the refrigerant temperature and entropy at the outlet and inlet of the component.

  In the fourth embodiment, the diagnosis result related to the state of the diagnosis target component is displayed on the display unit (55). The diagnosis result displayed on the display unit (55) is confirmed on behalf of the user of the refrigeration apparatus (10) by, for example, a person who has specialized knowledge about the refrigeration apparatus (10). For this reason, since the state of the diagnostic object part can be grasped more accurately, an abnormality of the refrigeration apparatus (10) can be reliably detected. It is also possible to prevent a failure of the refrigeration apparatus (10).

  Note that the display unit (55) may also display the value of loss generated in each circuit component. As a result, it is possible to individually grasp the change in the value of loss generated in each circuit component.

  Here, in a conventional refrigeration apparatus diagnosis device that diagnoses a refrigeration apparatus using a communication line, the state of the refrigeration apparatus (10) is diagnosed by counting error codes transmitted from the refrigeration apparatus (10). It was. However, the conventional diagnostic apparatus can only diagnose items for which an error code has been set in advance. One cause may be counted for a plurality of items. That is, there is a possibility that an item having no abnormality is counted as having an abnormality. Therefore, it has been difficult to make an accurate diagnosis.

  On the other hand, by using the value of loss generated in each circuit component represented by the Ts diagram, the person who viewed the display unit (55) is limited to items set in advance as in the past. Diagnosis can be made for various items without any problems. Moreover, the value of the loss generated in each circuit component corresponds to the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b). Therefore, since the state of the component corresponding to the loss value is accurately grasped, it is not determined that a circuit component having no abnormality is abnormal, and an accurate diagnosis can be performed as compared with the conventional case.

-Modification of Embodiment 4-
In this modification, the refrigerant state detection unit (51) among the refrigerant state detection unit (51), the loss calculation unit (52), the loss storage unit (53), the diagnosis unit (54), and the display unit (55) One component (47) is provided. The refrigerant state detection unit (51) and the loss calculation unit (52) may be provided in the first component (47), or the refrigerant state detection unit (51), the loss calculation unit (52), and the loss storage unit ( 53) and the diagnosis unit (54) may be provided in the first component (47).

<< Embodiment 5 of the Invention >>
Embodiment 5 of the present invention will be described. The fifth embodiment is an analyzer (60) of the refrigeration apparatus (10) according to the present invention. The analyzer (60) is configured to analyze the state of the refrigeration apparatus (10) as in the first embodiment, the second embodiment, and the third embodiment, and diagnose the state of the components.

-Configuration of analyzer-
As shown in FIG. 22, the analyzer (60) of Embodiment 5 of the present invention includes a calculator (70) and a refrigerant state detection sensor (65). The calculation unit (70) includes a refrigerant state detection unit (51), a loss calculation unit (52), a loss storage unit (53), a diagnosis unit (54), and a display unit (55). The calculation unit (70) is configured as an electronic computer.

  The refrigerant state detection sensor (65) includes five temperature sensors. When the cooling operation is performed when diagnosing the state of the refrigeration apparatus (10), as shown in FIG. 22, the first temperature sensor (65a) is attached to the suction side of the compressor (30), The second temperature sensor (65b) is attached to the discharge side of the compressor (30), the third temperature sensor (65c) is attached to the liquid side of the outdoor heat exchanger (34), and the fourth temperature sensor (65d) It is attached to the outdoor heat exchanger (34), and the fifth temperature sensor (65e) is attached to the indoor heat exchanger (37). Each temperature sensor (65) is connected to the calculation unit (70) via a lead wire (64).

  The refrigerant state detection unit (51) calculates the inlet and outlet of the compressor (30), the inlet and outlet of the expansion valve (36), and outdoor heat exchange from the measured values of the five temperatures measured by the temperature sensors (65). It is configured to detect the temperature and entropy of the refrigerant at eight positions of the inlet and outlet of the vessel (34) and the inlet and outlet of the indoor heat exchanger (37).

  Note that the refrigerant temperature and entropy at the inlet of the outdoor heat exchanger (34) are detected as the same values as those at the outlet of the compressor (30). The refrigerant temperature and entropy at the inlet of the expansion valve (36) are detected as the same values as those at the outlet of the outdoor heat exchanger (34). The refrigerant temperature and entropy at the outlet of the expansion valve (36) are detected as the same value as the value at the inlet of the indoor heat exchanger (37). The refrigerant temperature and entropy at the outlet of the indoor heat exchanger (37) are detected as the same values as those at the inlet of the compressor (30).

  Since the loss calculation unit (52), the loss storage unit (53), the diagnosis unit (54), and the display unit (55) are substantially the same as those of the first embodiment, description of these configurations is omitted. .

-Operation of the diagnostic device-
The operation when the analyzer (60) diagnoses the state of the part to be diagnosed will be described. The diagnosis of the state of the diagnosis target component can be performed during the cooling operation or the heating operation. Below, the case where a diagnosis is performed during the cooling operation will be described. Since the operations of the loss storage unit (53), the diagnosis unit (54), and the display unit (55) are substantially the same as those of the first embodiment, only the operation of the refrigerant state detection unit (51) will be described. .

  First, the refrigerant state detection unit (51) detects the measurement value of the fourth temperature sensor (65d) as the refrigerant condensation temperature in the outdoor heat exchanger (34), and calculates the refrigerant saturation pressure at the condensation temperature. The saturation pressure is detected as the high pressure of the refrigeration cycle. The refrigerant state detector (51) detects the measurement value of the fifth temperature sensor (65e) as the refrigerant evaporation temperature in the indoor heat exchanger (37), and calculates the refrigerant saturation pressure at the evaporation temperature. The saturation pressure is detected as a constant pressure of the refrigeration cycle.

  Next, the refrigerant state detector (51) calculates the entropy of the refrigerant at the inlet of the compressor (30) using the measured value of the first temperature sensor (65a) and the low pressure of the refrigeration cycle. Thereby, the temperature and entropy of the refrigerant | coolant of the inlet_port | entrance of a compressor (30) are grasped | ascertained.

  Next, the refrigerant state detector (51) calculates the entropy of the refrigerant at the outlet of the compressor (30) using the measured value of the second temperature sensor (65b) and the high pressure of the refrigeration cycle. Thereby, the temperature and entropy of the refrigerant | coolant of the exit of a compressor (30) are grasped | ascertained.

  Next, the refrigerant state detection unit (51) uses the measured value of the third temperature sensor (65c) and the high pressure of the refrigeration cycle, and the entropy of the refrigerant at the outlet of the outdoor heat exchanger (34) serving as a condenser and Calculate the enthalpy. Thereby, the temperature and entropy of the refrigerant | coolant of the exit of an outdoor heat exchanger (34) are grasped | ascertained.

  Finally, the refrigerant state detector (51) uses the measured value of the fifth temperature sensor (65e) as the refrigerant temperature at the inlet of the indoor heat exchanger (37) serving as an evaporator. And a refrigerant | coolant state detection part (51) calculates the entropy of the refrigerant | coolant of the inlet_port | entrance of an indoor heat exchanger (37) using the enthalpy of the refrigerant | coolant of the exit of an outdoor heat exchanger (34). Thereby, the temperature and entropy of the refrigerant | coolant of the inlet_port | entrance of an indoor heat exchanger (37) are grasped | ascertained.

  In the fifth embodiment, a person who has specialized knowledge about the refrigeration apparatus (10) carries the analyzer (60) of the refrigeration apparatus (10) so that the refrigeration apparatus (10) is installed at the place where the refrigeration apparatus (10) is installed. It becomes possible to diagnose the state of the part to be diagnosed. Therefore, a person who has specialized knowledge about the refrigeration apparatus (10) can accurately diagnose the state of the diagnostic target part on the spot in place of the user of the refrigeration apparatus (10). Moreover, since the analyzer (60) of the refrigeration apparatus (10) includes the refrigerant state detection sensor (65), it includes a sensor for detecting the temperature and entropy of the refrigerant at the outlet and inlet of each main component device. It is possible to diagnose the state of the part to be diagnosed even for the refrigeration apparatus (10) that is not present.

  In the fifth embodiment, even if the refrigerant state detection sensor (65) does not include a pressure sensor, the temperature and entropy of the refrigerant at the outlet and the inlet of each main component device are calculated. Therefore, it is possible to easily diagnose the state of the part to be diagnosed by the temperature sensor (65) that is easily attached.

  In addition, the refrigerant | coolant state detection part (51) of this Embodiment 5 is applied also to the controller (50) of the refrigerating device (10) of the said Embodiment 1 to Embodiment 3, and the analyzer (60) of the said Embodiment 4. Is possible. In this case, the temperature and entropy of the refrigerant at the outlet and the inlet of each main component device can be detected only by providing the five temperature sensors (45) at the position where the temperature sensor (65) is attached in the fifth embodiment. Is possible.

-Modification of Embodiment 5-
In this modification, the analyzer (60) does not include the refrigerant state detection sensor (65). The analyzer (60) is connected to the refrigeration apparatus (10) via a lead wire. The refrigeration apparatus (10) is provided with the same temperature sensor (45) and pressure sensor (46) as in the first embodiment.

  In the analysis apparatus (60) of this modification, the diagnosis of the state of the diagnosis target component is performed for the connected refrigeration apparatus (10). At that time, the measured values of the temperature sensor (45) and the pressure sensor (46) are transmitted from the refrigeration apparatus (10) to the calculator (70). The refrigerant state detection unit (51) uses the measurement value of the temperature sensor (45) and the measurement value of the pressure sensor (46) transmitted from the refrigeration apparatus (10), and each main component device of the refrigeration apparatus (10). The temperature and entropy of the refrigerant at the outlet and the inlet are detected.

<< Other Embodiments >>
You may comprise the said embodiment like the following modifications.

-First modification-
About the said embodiment, you may make it a diagnosis part (54) diagnose the state of a diagnostic object part based on the distribution condition of the value of the loss which arises in each circuit component. Specifically, the diagnosis unit (54) diagnoses the state of the diagnosis target component based on the ratio of the loss generated in each circuit component to the total loss. In this case, the loss storage unit (53) stores an average loss distribution in a normal operation state. For example, the diagnosis unit (54) indicates that the compressor (30) is in a failed state when the ratio of loss due to mechanical friction in the compressor (30) at the time of diagnosis is greater than 10% compared to the normal operating state. It is determined that This makes it possible to diagnose the status of parts to be diagnosed even when it is difficult to compare the losses for each major component device because the total loss at diagnosis is significantly different from the total value for normal operating conditions. It is also possible to do.

-Second modification-
About the said embodiment, you may make it a diagnosis part (54) diagnose the state of components to be diagnosed by comprehensively analyzing the change pattern of the loss distribution from a normal driving | running state.

-Third modification-
About the said embodiment, you may make it a diagnosis part (54) diagnose the state of a diagnostic object part based on the time change of the value of the loss which arises in each circuit component. The diagnosis unit (54), for example, shows a temporal change pattern of the loss of the circuit component when the air conditioning load is increased and a temporal change pattern of the loss of the circuit component when the diagnosis target component is in a deterioration tendency. By identifying, the state of the component to be diagnosed is diagnosed.

  For example, as shown in FIG. 23 (A), the diagnosis unit (54), when the work amount of the reverse Carnot cycle is relatively large, is because the circulation amount of the refrigerant has increased due to an increase in the air conditioning load. Since the loss value increases, it is not determined that the diagnosis target component is in a deterioration tendency even if the loss of the circuit component increases.

  On the other hand, as shown in FIG. 23B, the diagnosis unit (54) indicates that the air-conditioning load has not increased, that is, the refrigerant circulation amount has increased when the work amount of the reverse Carnot cycle has hardly changed. Although the loss has increased, the portion corresponding to the circuit component having the increased loss value is determined to be in a deterioration tendency. In this case, the diagnosis unit (54) can detect that the window of the indoor space is open based on a change in the air conditioning load, and can display the window on the display unit (55) so as to close the window. .

  In addition, the time-dependent change pattern of the loss of circuit components when starting the refrigeration system (10) and the time-dependent change pattern of the loss of circuit components during defrost operation that melts ice attached to the evaporator are also parts to be diagnosed. It is possible to use for the diagnosis of the condition.

-Fourth modification-
About the said Embodiment 1, you may provide the temperature sensor (45) and pressure sensor (46) for directly detecting the temperature and entropy of the refrigerant | coolant of an inlet_port | entrance of an expansion valve (36), and an exit. Specifically, a temperature sensor (45) and a pressure sensor (46) are provided between the outdoor heat exchanger (34) and the expansion valve (36), and between the expansion valve (36) and the gas side end of the outdoor circuit (21). ). As a result, the state of the refrigerant pipe connecting the outdoor heat exchanger (34) and the expansion valve (36) and the refrigerant pipe connecting the expansion valve (36) and the indoor heat exchanger (37) can also be diagnosed. It becomes possible to diagnose as.

  In the first embodiment, four sets of the temperature sensor (45) and the pressure sensor (46) may be provided. Specifically, unlike the first embodiment, between the outdoor heat exchanger (34) and the four-way switching valve (33), between the gas side end of the indoor circuit (22) and the indoor heat exchanger (37). Are not provided with a temperature sensor (45) and a pressure sensor (46).

  Moreover, about the said Embodiment 1, the said Embodiment 2, and the said Embodiment 3, you may make only two pressure sensors (46), what measures the pressure of a high pressure refrigerant | coolant, and what measures the pressure of a low pressure refrigerant | coolant. . For example, only the suction pressure sensor (46a) and the discharge pressure sensor (46b) are provided in the refrigerant circuit (20). In this case, the measured values of the discharge pressure sensor (46b) are used to calculate the entropy at the inlet and outlet of the heat exchanger (34, 37), which is a radiator, and evaporation is performed using the measured value of the suction pressure sensor (46a). Calculate the entropy of the inlet and outlet of the heat exchanger (34, 37) that is the heat exchanger.

  Moreover, about the said Embodiment 1, the said Embodiment 2, and the said Embodiment 3, a temperature sensor is provided in the heat exchanger (34,37) used as a radiator, without providing a discharge pressure sensor (46b), and the temperature sensor The high pressure of the refrigeration cycle may be calculated using the measured value. In addition, even if the suction pressure sensor (46a) is not provided, a temperature sensor is provided in the heat exchanger (34, 37) serving as an evaporator, and the low pressure of the refrigeration cycle is calculated using the measured value of the temperature sensor. Good.

-Fifth modification-
About the said embodiment, you may make it perform the loss memory | storage driving | operation for calculating the loss reference value which a loss memory | storage part (53) memorize | stores. The loss memory operation is performed when the refrigeration apparatus (10) is in a normal operation state (for example, immediately after installation of the refrigeration apparatus (10) or before product shipment). In the loss memory operation, a loss value generated in each circuit component calculated by the loss calculation unit (52) is stored in the loss storage unit (53). By performing the loss memory operation before shipping the product, it becomes possible to detect a defective product based on the loss value calculated by the loss calculation unit (52).

-Sixth Modification-
About the said embodiment, a display part (55) may display what represented the loss value for every circuit component, and the loss value for every circuit component. For example, as shown in FIG. 24, the display unit (55) displays a pie chart showing the ratio of the loss value (instantaneous value) for each circuit component (main component device) with the total loss as 100%. Also good.

  In addition, as shown in FIG. 25, the display unit (55) displays a rate of increase / decrease in loss value (instantaneous value) assuming that the normal operation state is 50% for each circuit component (main component device). A chart may be displayed.

  Further, as shown in FIG. 26, the display unit (55) may display the loss value (instantaneous value) for each circuit component (main component device) converted into electric power, and further converted into the amount of money. May be displayed.

  Moreover, the display part (55) may be provided with the lighting part corresponding to each circuit component (main component apparatus) as shown in FIG. In this case, the loss value (instantaneous value) of each circuit component is quantized into a plurality of values, and the state of each circuit component is represented by the state of the lighting unit. For example, in the case of quantizing the loss value of each circuit component into a binary value, the lighting unit is configured to turn off when normal and turn on when abnormal. In addition, when quantizing the loss value of each circuit component into three values, the lighting unit is configured to light up in green during normal operation, light up in yellow during warning, and light up in red during abnormality. Note that when a loss of circuit components is in a predetermined state close to a state where it is determined that there is a failure, it is determined that a warning has occurred.

  In addition, as shown in FIG. 28, the display unit (55) may show the change over time in the loss value for each circuit component (main component device) in a separate chart. Further, as shown in FIG. 29, the display unit (55) may display the change over time in the value of loss for each circuit component (main component device) on the same chart. In this case, the outside air temperature, the room temperature, the cooling capacity, etc. may be displayed together.

-Seventh modification-
In the first to third embodiments, the controller (50) may not have the diagnosis unit (54). Moreover, about the said Embodiment 4 and Embodiment 5, the analyzer (60) does not need to have a diagnostic part (54). In these cases, the display unit (55) displays the loss state of the circuit component based on the calculated value calculated by the change amount calculating means (52). Specifically, the loss value for each circuit component and the loss value for each circuit component are displayed as a chart. The state of loss of circuit components is displayed as information for diagnosing the state of the refrigeration apparatus (10). The loss state of the circuit component corresponds to the state of the circuit component and the state of the fluid component (12, 14, 28, 75, 76b). Who have technical knowledge diagnoses the status of circuit components and fluid components (12, 14, 28, 75, 76b) from the loss status of circuit components displayed on the display (55) Is possible.

-Eighth Modification-
In the above embodiment, the magnitude of the refrigerant energy change generated in each circuit component calculated from the thermodynamic analysis is calculated as the value of the loss generated in each circuit component. May be calculated as the use of power, required power, and power distribution corresponding to each circuit component. In this case, instead of the loss calculation unit (52), a power calculation unit (52) that calculates the use of power, required power, or power distribution in each circuit component is provided as a change amount calculation unit.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for a refrigeration apparatus having a function of analyzing the state of a refrigeration apparatus, and an analysis apparatus for a refrigeration apparatus.

It is a schematic block diagram of the freezing apparatus which concerns on Embodiment 1 of this invention. It is a Ts diagram divided into each area | region so that it may correspond to the circuit component which calculates the value of loss in Embodiment 1 of this invention. It is a graph showing the change of the state of the refrigerant | coolant from the inlet_port | entrance of an evaporator to an exit. (A) is a Ts diagram of a normal driving | running state, (B) is an example of the Ts diagram at the time of diagnosis. It is a graph which shows the correlation with the loss which arises in a compressor, and the fall degree of the capability of a compressor. (A) is a Ts diagram of a normal driving | running state, (B) is an example of the Ts diagram at the time of diagnosis. It is a graph which shows the correlation with the loss in an evaporator, and the fall degree of the air volume of a fan. (A) is a Ts diagram of a normal driving | running state, (B) is an example of the Ts diagram at the time of diagnosis. It is a graph which shows the correlation with the increase in the loss in an evaporator, and the pressure loss of the refrigerant | coolant in an evaporator. It is a graph which shows the correlation with the loss in a condenser, and the fall degree of the air volume of a fan. It is a graph showing the distribution condition of the loss which arises in each circuit component. It is a chart which shows an example of field division of a Ts diagram. It is a Ts diagram divided into each area | region so that it may correspond to the circuit component which calculates the value of loss in the modification of Embodiment 1 of this invention. It is a schematic block diagram of the freezing apparatus which concerns on Embodiment 2 of this invention. It is a circuit diagram for demonstrating Formula 6 to Formula 9 in Embodiment 2 of this invention. It is a Ts diagram divided into each area so as to correspond to a circuit component which calculates a value of loss in Embodiment 2 of the present invention, and (A) is a Ts diagram corresponding to an indoor circuit. And (B) is a Ts diagram corresponding to the bypass pipe. It is a schematic block diagram of the freezing apparatus which concerns on the modification of Embodiment 2 of this invention. It is a schematic block diagram of the outdoor unit of the freezing apparatus which concerns on the modification of Embodiment 2 of this invention. It is a schematic block diagram of the freezing apparatus which concerns on Embodiment 3 of this invention. It is a Ts diagram divided into each area | region so that it might correspond to the circuit component which calculates the value of loss in Embodiment 3 of this invention. It is a schematic block diagram of the diagnostic apparatus of the freezing apparatus which concerns on Embodiment 4 of this invention. It is a schematic block diagram of the diagnostic apparatus of the freezing apparatus which concerns on Embodiment 5 of this invention. It is a graph which shows the time change of the loss of a circuit component in the refrigeration apparatus which concerns on the 3rd modification of other embodiment. It is a figure which shows the display method of the loss of the circuit component in the display part which concerns on the 6th modification of other embodiment. It is a figure which shows the other example of the display method of the loss of the circuit component in the display part which concerns on the 6th modification of other embodiment. It is a figure which shows the other example of the display method of the loss of the circuit component in the display part which concerns on the 6th modification of other embodiment. It is a figure which shows the other example of the display method of the loss of the circuit component in the display part which concerns on the 6th modification of other embodiment. It is a figure which shows the other example of the display method of the loss of the circuit component in the display part which concerns on the 6th modification of other embodiment. It is a figure which shows the other example of the display method of the loss of the circuit component in the display part which concerns on the 6th modification of other embodiment.

Explanation of symbols

10 Air conditioning equipment (refrigeration equipment)
20 Refrigerant circuit
30 Compressor (circuit components)
34 Outdoor heat exchanger (heat exchanger, circuit components)
36 Expansion valves, outdoor expansion valves (pressure reduction means, circuit components)
37 Indoor heat exchangers (heat exchangers, circuit components)
39 Indoor expansion valves (pressure reduction means, circuit components)
45 Temperature sensor
46 Pressure sensor
51 Refrigerant state detection unit (refrigerant state detection means)
52 Loss calculation part (change amount calculation means)
53 Loss storage unit (loss storage means)
54 Diagnostic department (diagnostic means)
55 Display (display means)
56 Flow rate calculation unit (flow rate calculation means)
60 Analyzer
65 Refrigerant state detection sensor
66 Main circuit
67 Branch circuit

Claims (20)

A refrigerant circuit (20) configured by connecting circuit components including a compressor (30), a decompression means (36, 39), and a plurality of heat exchangers (34, 37) is provided, and the refrigerant circuit (20 ) In which a refrigerant is circulated to perform a refrigeration cycle,
Refrigerant state detection means (51) for detecting the temperature and entropy of the refrigerant at the respective inlets and outlets of the compressor (30), the decompression means (36,39), and the heat exchanger (34,37);
Change amount calculation means (52) for individually calculating the magnitude of the change in energy of the refrigerant generated in each of the circuit components using the refrigerant temperature and entropy detected by the refrigerant state detection means (51). A refrigeration apparatus characterized by comprising: In claim 1,
Fluid components (12, 14, 28, 75, 76b) through which a fluid that exchanges heat with the refrigerant flows in the heat exchanger (34, 37);
Using at least one of the circuit component and the fluid component (12, 14, 28, 75, 76b) as a diagnosis target component, the diagnosis target component based on the calculated value calculated by the change amount calculation means (52) A refrigeration apparatus comprising: diagnostic means (54) for diagnosing the state of the above. In claim 2,
The fan (12,14) for sending air to the heat exchanger (34,37) constitutes the fluid component (12,14,28,75,76b),
The diagnosis means (54) diagnoses the state of the fan (12, 14) based on the calculated value calculated by the change amount calculation means (52) using the fan (12, 14) as the diagnosis target component. A refrigeration apparatus characterized by that. In claim 2 or 3,
The change amount calculation means (52) calculates the magnitude of the refrigerant energy change occurring in each of the circuit components as a value of the loss generated in each of the circuit components,
The refrigeration apparatus, wherein the diagnosis means (54) diagnoses the state of the diagnosis target part based on the calculated value calculated by the change amount calculation means (52) as the loss value. In claim 4,
The change amount calculation means (52) individually calculates a plurality of types of loss values generated in each heat exchanger (34, 37),
The diagnosis means (54) is configured to detect the loss generated in each heat exchanger (34, 37) based on the calculated values for each of a plurality of types of loss calculated by the change amount calculation means (52). A refrigeration apparatus characterized by diagnosing the state of In claim 4 or 5,
The refrigerant circuit (20) includes a main circuit (66) provided with a compressor (30) for compressing the refrigerant to the high pressure of the refrigeration cycle, and a plurality of parallel circuits connected to the main circuit (66). While comprising a branch circuit (67),
Provided with a flow rate calculating means (56) for calculating the refrigerant flow rate of each branch circuit (67),
The change amount calculating means (52) calculates a value of loss generated in the circuit component using the refrigerant flow rate of each branch circuit (67) calculated by the flow rate calculating means (56). apparatus. In claim 6,
In the refrigerant circuit (20), there are a plurality of branch circuits (67) provided with the heat exchanger (34, 37),
The change amount calculating means (52) is a refrigerant of the branch circuit (67) in which the flow rate calculating means (56) calculates a value of loss generated in the heat exchanger (34, 37) of the branch circuit (67). A refrigeration apparatus that calculates using a flow rate. In any one of Claims 4 thru | or 7,
Loss storage means (53) for storing, as a loss reference value, the magnitude of the loss that occurs in each of the circuit components under normal operating conditions,
The diagnosis means (54) diagnoses the state of the diagnosis target part based on the calculated value calculated by the change amount calculation means (52) and the loss reference value stored by the loss storage means (53). Refrigeration equipment characterized. In claim 8,
The diagnostic means (54) compares the calculated value calculated by the change amount calculating means (52) with the loss reference value stored by the loss storage means (53) for each loss generated in each circuit component. A refrigeration apparatus characterized by diagnosing the state of the part to be diagnosed. In claim 8 or 9,
The loss storage means (53) stores a normal reference loss value for a plurality of operating conditions,
The diagnosis means (54) uses the loss reference value of the operation condition corresponding to the operation condition at the time of diagnosis among the loss reference values stored in the loss storage means (53) for the diagnosis of the state of the diagnosis target part. Refrigeration equipment characterized. In any one of Claims 2 thru | or 7,
The refrigeration apparatus characterized in that the diagnosis means (54) diagnoses the state of the diagnosis target part based on a change with time of the calculated value calculated by the change amount calculation means (52). In any one of claims 2 to 11,
A refrigeration apparatus comprising display means (55) for displaying a diagnosis result relating to the state of the diagnosis target part by the diagnosis means (54). In any one of claims 1 to 12,
In the refrigerant circuit (20), in order to measure the temperature and pressure of the refrigerant at the inlet and outlet of the compressor (30) and the heat exchangers (34, 37), While one set of temperature sensor (45) and one pressure sensor (46) is provided on each of the one end side and the other end side of the heat exchanger (34, 37),
The refrigerant state detecting means (51) sets the refrigerant temperature and entropy at the inlet of the pressure reducing means (36, 39) to the same values as the values at the outlet of the heat exchanger (34, 37) serving as a radiator. A refrigerating apparatus characterized in that the temperature and entropy of the refrigerant at the outlet of the means (36, 39) are set to the same value as the value at the inlet of the heat exchanger (34, 37) serving as an evaporator. In claim 1,
As information for diagnosing the refrigeration apparatus (10), display means (55) for displaying the state of energy change of the refrigerant generated in each circuit component based on the calculated value calculated by the change amount calculating means (52) A refrigeration apparatus comprising: A refrigerant circuit (20) configured by connecting circuit components including a compressor (30), a decompression means (36, 39), and a plurality of heat exchangers (34, 37) is provided, and the refrigerant circuit (20 ) Is connected to a refrigeration apparatus (10) that circulates a refrigerant to perform a refrigeration cycle, and analyzes the state of the refrigeration apparatus (10),
Refrigerant state detection means (51) for detecting the temperature and entropy of the refrigerant at the respective inlets and outlets of the compressor (30), the decompression means (36,39), and the heat exchanger (34,37);
Change amount calculation means (52) for individually calculating the magnitude of the energy change of the refrigerant generated in each of the circuit components using the refrigerant temperature and entropy detected by the refrigerant state detection means (51),
A refrigeration apparatus analyzer comprising: display means (55) for displaying an analysis result of the state of the refrigeration apparatus (10) based on the calculated value calculated by the change amount calculation means (52). In claim 15,
The refrigeration apparatus (10) is provided with fluid components (12, 14, 28, 75, 76b) through which a fluid that exchanges heat with refrigerant in the heat exchanger (34, 37) flows.
Using at least one of the circuit component and the fluid component (12, 14, 28, 75, 76b) as a diagnosis target component, the diagnosis target component based on the calculated value calculated by the change amount calculation means (52) Diagnostic means (54) for diagnosing the condition of
The refrigeration apparatus analysis apparatus, wherein the display means (55) displays a diagnosis result relating to a state of a diagnosis target part by the diagnosis means (54) as an analysis result of the state of the refrigeration apparatus (10). In claim 15 or 16,
The display means (55), as an analysis result of the state of the refrigeration apparatus (10), is a state of energy change of the refrigerant generated in each circuit component based on the calculated value calculated by the change amount calculating means (52) A refrigeration apparatus characterized by displaying. In any one of Claims 15 thru | or 17,
The refrigerant circuit (20) required for detecting the temperature and entropy of the refrigerant at the respective inlets and outlets of the compressor (30), the decompression means (36, 39), and the heat exchanger (34, 37) A first component (47) provided in the refrigeration apparatus (10) with at least a refrigerant state detection sensor (65) for detecting the state of the refrigerant of
A second component (48) provided at least at the display means (55) and installed at a position away from the refrigeration apparatus (10),
The analyzer for a refrigeration apparatus, wherein the first component (47) and the second component (48) are connected to each other via a communication line (63). In any one of Claims 15 thru | or 17,
It is attached to the refrigerant circuit (20) and detects the temperature and entropy of the refrigerant at the inlet and outlet of the compressor (30), the decompression means (36, 39), and the heat exchanger (34, 37). A refrigerant state detection sensor (65) for detecting the refrigerant state of the refrigerant circuit (20) required for
The refrigerant state detection means (51) calculates the refrigerant temperature and entropy at the inlet and outlet of the compressor (30), the decompression means (36, 39), and the heat exchanger (34, 37), respectively. An analysis apparatus for a refrigeration apparatus, wherein the measurement value of the refrigerant state detection sensor (65) is used. In claim 19,
The refrigerant state detection sensor (65) includes a plurality of temperature sensors (65), one of which is attached to a heat exchanger (34, 37) serving as a radiator, and the other one is a heat exchange serving as an evaporator. While attached to the vessel (34,37)
The refrigerant state detection means (51) calculates the high pressure of the refrigeration cycle based on the measured value of the temperature sensor (65) attached to the heat exchanger (34, 37) serving as a radiator, and serves as an evaporator. By calculating the low pressure of the refrigeration cycle based on the measured value of the temperature sensor (65) attached to the heat exchanger (34, 37), the compressor (30), the pressure reducing means (36, 39), and An analyzer for a refrigerating apparatus, characterized in that the temperature and entropy of refrigerant at each inlet and outlet of a heat exchanger (34, 37) are calculated.

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