WO2019234824A1

WO2019234824A1 - Refrigeration cycle system

Info

Publication number: WO2019234824A1
Application number: PCT/JP2018/021537
Authority: WO
Inventors: 栗田　慎
Original assignee: 三菱電機株式会社
Priority date: 2018-06-05
Filing date: 2018-06-05
Publication date: 2019-12-12
Also published as: TWI704320B; TW202004095A; JPWO2019234824A1; JP7004811B2

Abstract

This refrigeration cycle system comprises: a refrigerant circuit including a compressor; a flowmeter that detects the flow rate of a refrigerant circulating through the refrigerant circuit; an intake temperature detector that detects the intake gas temperature of the refrigerant entering the compressor; a discharge temperature detector that detects the discharge gas temperature of the refrigerant that is discharged from the compressor; a condensation temperature detector that detects the condensation temperature of the refrigerant; an evaporation temperature detector that detects the evaporation temperature of the refrigerant; a supercooling detector that is provided between an expansion valve and the compressor, and that detects the supercooling temperature; a determination means for determining whether the compressor is in normal operation on the basis of the discharge gas temperature; a usability calculation means for calculating, if the compressor is determined to be in normal operation, refrigeration usability on the basis of the flow rate and the enthalpy difference determined from the evaporation temperature, the condensation temperature, the intake gas temperature, the discharge gas temperature, and the supercooling temperature; and a fee calculation means for calculating the fee for using the refrigeration cycle system on the basis of the refrigeration usability.

Description

Refrigeration cycle system

The present invention relates to a refrigeration cycle system having a compressor.

A compressor for compressing refrigerant circulating in the refrigerant circuit is combined with refrigerant equipment such as a condenser, an evaporator and an expansion valve, and used as a refrigeration cycle apparatus. Among a plurality of types of compressors, for example, a screw compressor is relatively expensive, and therefore, when a user purchases a refrigeration cycle apparatus including the screw compressor, a large cost is initially required.

After purchasing the refrigeration cycle device, the user needs to perform daily inspection and periodic maintenance so that the operation does not stop, and to manage the refrigeration cycle device. The screw compressor is a semi-hermetic type in which a casing does not have a welded portion, and is a compressor on the premise that regular maintenance is performed. Therefore, the user regularly maintains the screw compressor in order to use the refrigeration cycle apparatus for many years. In this case, the user has to determine the maintenance time many times over a long period of time, which is a heavy burden.

2. Description of the Related Art Conventionally, there is disclosed a fee management device that sets a unit price of a usage fee for a used refrigeration capacity and charges a user for a usage fee for facilitating investment recovery in an air conditioner (for example, see Patent Document 1). .

The charge management device of Patent Document 1 uses the refrigerant temperature of the condenser and the evaporator, the temperature of the refrigerant inlet side of the expansion valve, the intake gas temperature and the discharge gas temperature of the compressor, and Obtain the enthalpy of each part on the refrigeration and air conditioning cycle such as supercooling at the discharge side and condenser outlet. In addition, the charge management device stores data on the refrigerant circulation amount of the compressor with the evaporation pressure and the condensation pressure of the compressor as variables, and stores the refrigerant circulation amount during operation from the measured evaporation temperature and condensation temperature. presume. In the case of cooling operation, the charge management device calculates the used refrigeration capacity by adding the estimated refrigerant circulation amount to the enthalpy difference between the outlet and the inlet of the evaporator.

JP 2001-76041 A

In Patent Document 1, the compressor is not damaged, and the refrigerant circulation amount is estimated using the performance characteristic data of the compressor during normal operation. However, the estimated refrigerant circulation amount is different from the actual refrigerant circulation amount. Sometimes. For example, if the wear of the parts constituting the compression unit is progressing, the amount of refrigerant circulation decreases. Therefore, although the compressor is damaged and maintenance is required for the compressor, the user may be charged for the use of the refrigeration cycle apparatus in an abnormal operation state.

The present invention has been made to solve the above-described problems, and provides a refrigeration cycle system that charges a user a usage fee for normal operation of a compressor.

A refrigeration cycle system according to the present invention includes a refrigerant circuit in which a compressor, a condenser, an evaporator, and an expansion valve are connected, in which a refrigerant circulates, a flow meter that detects a flow rate of the refrigerant that circulates in the refrigerant circuit, and the compression An intake temperature detector for detecting an intake gas temperature of refrigerant sucked into the machine, a discharge temperature detector for detecting an exhaust gas temperature of refrigerant discharged from the compressor, and a condenser provided in the condenser A condensing temperature detector for detecting the temperature, an evaporating temperature detector for detecting the evaporating temperature of the refrigerant, provided between the expansion valve and the condenser, for detecting the supercooling temperature. A subcooling detector; determination means for determining whether or not the compressor is operating normally based on the discharge gas temperature; and if it is determined that the compressor is operating normally, the evaporation Temperature, condensing temperature, before Use capacity calculation means for calculating the use refrigerating capacity from the enthalpy difference obtained from the intake gas temperature, the discharge gas temperature and the supercooling temperature and the flow rate, and the use charge of the refrigerating cycle system is calculated based on the use refrigerating capacity. Charge calculation means.

According to the present invention, the use refrigeration capacity is calculated when it is determined that the compressor is normal based on the discharge gas temperature of the compressor, and the use fee corresponding to the calculated use refrigeration capacity is imposed on the user. A usage fee is not charged to the user when the compressor is used in an abnormal state.

It is a figure which shows the example of 1 structure of the refrigerating cycle system which concerns on Embodiment 1 of this invention. It is a figure which shows the example of 1 structure of the control apparatus shown in FIG. FIG. 3 is a functional block diagram illustrating a configuration example of a control unit illustrated in FIG. 2. It is a flowchart which shows the operation | movement procedure of the refrigerating cycle system shown in FIG. It is a figure which shows the example of 1 structure of the refrigerating cycle system which concerns on Embodiment 2 of this invention. It is a figure which shows the example of 1 structure of the control apparatus shown in FIG. It is a figure which shows the example of 1 structure of the management apparatus shown in FIG. FIG. 8 is a functional block diagram illustrating a configuration example of a control unit illustrated in FIG. 7. It is a sequence diagram which shows the operation | movement procedure of the refrigerating cycle system shown in FIG.

Embodiment 1 FIG.
The configuration of the refrigeration cycle system according to the first embodiment will be described. FIG. 1 is a diagram illustrating a configuration example of a refrigeration cycle system according to Embodiment 1 of the present invention. As shown in FIG. 1, the refrigeration cycle system 1 includes a compressor 2, a condenser 3, an evaporator 4, an expansion valve 5, a four-way valve 6, and a control device 18. The compressor 2, the condenser 3, the evaporator 4, and the expansion valve 5 are connected by refrigerant piping, and the refrigerant circuit 40 through which the refrigerant circulates is configured.

In Embodiment 1, it is assumed that the manufacturer of the refrigeration cycle system 1 entrusts the operation of the refrigeration cycle system 1 including the compressor 2 to a maintenance company. A user of the refrigeration cycle system 1 makes a contract with a maintenance company to pay a rental fee for the refrigeration cycle system according to use of the compressor 2 in a normal operation state. The maintenance company receives the rental fee of the refrigeration cycle system from the user, and manages and manages the compressor 2 so that the compressor 2 can stably operate.

FIG. 1 shows a case where the operation state of the refrigeration cycle system 1 is a cooling operation, and shows a case where the load side heat exchanger functions as the evaporator 4 and the heat source side heat exchanger functions as the condenser 3. Yes. When the operation state of the refrigeration cycle system 1 is heating operation, the load side heat exchanger of the evaporator 4 shown in FIG. 1 functions as a condenser, and the heat source side heat exchanger of the condenser 3 shown in FIG. 1 serves as an evaporator. Although functional, the illustration in this case is omitted. In the following description, a case where the load side heat exchanger functions as the evaporator 4 and the heat source side heat exchanger functions as the condenser 3 will be described.

Referring to FIG. 1, each configuration of the refrigeration cycle system 1 will be described. In the first embodiment, the compressor 2 is a single-stage single screw compressor that is driven by an inverter 9. Power is supplied to the inverter 9 via the power supply line Pw. A distribution board 10 and a wattmeter 11 are provided on the power supply line Pw. The wattmeter 11 detects the power consumption of the inverter 9. The expansion valve 5 is an expansion device that decompresses and expands the refrigerant. The expansion valve 5 is, for example, an electronic expansion valve. The four-way valve 6 is a flow path switching device that switches the flow direction of the refrigerant according to the operating state of the refrigeration cycle system 1.

A flow meter 7 and a flow meter 8 for detecting the flow rate of the refrigerant flowing through the refrigerant circuit 40 are provided. The flow meter 7 is provided between the condenser 3 and the expansion valve 5. The flow meter 7 detects the flow rate per unit time of the refrigerant flowing between the condenser 3 and the expansion valve 5 in the cooling operation, converts the detected value into an electric signal, and outputs it. The flow meter 8 is provided between the evaporator 4 and the expansion valve 5. The flow meter 8 detects the flow rate per unit time of the refrigerant flowing between the evaporator 4 and the expansion valve 5 in the heating operation, converts the detected value into an electric signal, and outputs it.

In the refrigeration cycle system 1, as a means for detecting an operating state, a condensation temperature detector 12, an evaporation temperature detector 13, an intake temperature detector 14, a discharge temperature detector 15, and

supercooling detectors

16 and 17. And are provided. The condensation temperature detector 12 is provided in the condenser 3. The condensing temperature detector 12 detects the condensing temperature of the refrigerant in the condenser 3, converts the detected value into an electric signal, and outputs it. The evaporation temperature detector 13 is provided in the evaporator 4. The evaporating temperature detector 13 detects the evaporating temperature of the refrigerant in the evaporator 4, converts the detected value into an electric signal, and outputs it.

The suction temperature detector 14 is provided in the refrigerant pipe on the refrigerant suction side of the compressor 2. The suction temperature detector 14 detects the suction gas temperature of the refrigerant sucked into the compressor 2, converts the detected value into an electrical signal, and outputs it. The discharge temperature detector 15 is provided in the refrigerant pipe on the refrigerant discharge side of the compressor 2. The discharge temperature detector 15 detects the discharge gas temperature of the refrigerant discharged from the compressor 2, converts the detected value into an electric signal, and outputs it.

The

supercooling detectors

16 and 17 are for detecting the supercooling temperature. The supercooling detector 16 is provided between the expansion valve 5 and the condenser 3. The supercooling detector 16 detects the supercooling temperature of the refrigerant flowing between the expansion valve 5 and the condenser 3 in the cooling operation, converts the detected value into an electrical signal, and outputs it. The supercooling detector 17 is provided between the expansion valve 5 and the evaporator 4. The supercooling detector 17 detects the supercooling temperature of the refrigerant flowing between the expansion valve 5 and the evaporator 4 in the heating operation, converts the detected value into an electric signal, and outputs it.

FIG. 2 is a diagram illustrating a configuration example of the control device illustrated in FIG. FIG. 3 is a functional block diagram illustrating a configuration example of the control unit illustrated in FIG. The control device 18 collectively manages the operation state and operation command information of the refrigeration cycle system 1. As illustrated in FIG. 2, the control device 18 includes a storage unit 50, a display unit 51, and a control unit 30. The control unit 30 includes a memory 31 that stores a program, and a CPU (Central Processing Unit) 32 that executes processing according to the program. The memory 31 is a non-volatile memory such as a flash memory, for example. The storage unit 50 is, for example, a hard disk drive device. The display unit 51 is, for example, a liquid crystal display device.

3, the control unit 30 includes a refrigeration cycle control means 33, a data acquisition means 34, a determination means 35, a use capacity calculation means 36, and a charge calculation means 37. When the CPU 32 executes the program, the refrigeration cycle control means 33, the data acquisition means 34, the determination means 35, the use capacity calculation means 36, and the charge calculation means 37 are configured in the refrigeration cycle system 1.

The refrigeration cycle control means 33 controls the four-way valve 6 in accordance with the input operation command when the user inputs an operation command for heating operation or cooling operation to the control device 18 via an operation unit not shown. The refrigeration cycle control means 33 calculates the supercooling degree SC from the temperature difference between the supercooling temperature and the condensation temperature, and controls the refrigerant circuit 40 so that the supercooling degree SC matches the target supercooling degree SCs.

The data acquisition means 34 stores the detection values received from the respective meters of the wattmeter 11, the

flow meters

7 and 8, the suction temperature detector 14, the discharge temperature detector 15, and the

supercooling detectors

16 and 17. Stored in the unit 50. The determination unit 35 determines whether or not the operation state of the compressor 2 is normal based on the discharge gas temperature. When the operating state of the compressor 2 is normal, the usage capacity calculating unit 36 calculates the enthalpy difference from the evaporation temperature, the condensation temperature, the suction gas temperature, the discharge gas temperature, and the supercooling temperature. Then, the use capacity calculation means 36 calculates the use refrigerating capacity Q from the integrated value of the value obtained by multiplying the enthalpy difference and the flow rate detected by the

flow meter

7 or 8. The charge calculation unit 37 calculates a use charge C based on the calculated use refrigeration capacity Q.

3 shows a case where the refrigeration cycle control means 33 receives detection values from the

supercooling detectors

16 and 17, but reference may be made to the detection values of each instrument stored in the storage unit 50. . Although not shown in FIG. 3, the refrigeration cycle control unit 33 may store information on the rotation frequency of the inverter 9, the flow path state of the four-way valve 6, and the opening degree of the expansion valve 5 in the storage unit 50. In this case, the determination means 35 can refer to information on the rotational frequency of the inverter 9, the flow path state of the four-way valve 6, and the opening degree of the expansion valve 5 when determining the operation state of the compressor 2.

FIG. 1 shows the case of an air conditioner that can switch the flow direction of the refrigerant circulating in the refrigerant circuit 40, but the refrigeration cycle system 1 is not limited to an air conditioner. For example, the refrigeration cycle system 1 may be a refrigerator, and in this case, the four-way valve 6 may not be provided. Further, a temperature sensor not shown in FIG. 1 may be provided in the air conditioning target space. In this case, the refrigeration cycle control means 33 may control the refrigerant circuit 40 so that the temperature of the air-conditioning target space becomes the set temperature.

Next, the operation of the refrigeration cycle system 1 of the first embodiment will be described. FIG. 4 is a flowchart showing an operation procedure of the refrigeration cycle system shown in FIG. Here, the case where the operation state of the refrigeration cycle system 1 is the cooling operation will be described.

When the compressor 2 starts operation, the condensation temperature detector 12 outputs a detection value indicating the condensation temperature. As for the evaporation temperature, the evaporation temperature detector 13 outputs a detection value indicating the evaporation temperature. The supercooling detector 16 outputs a detection value indicating the supercooling temperature. The intake temperature detector 14 outputs a detection value indicating the intake gas temperature. The discharge temperature detector 15 outputs a detection value indicating the discharge gas temperature. The flow meter 7 outputs a detection value indicating the flow rate of the refrigerant. The data acquisition unit 34 stores the detection values received from these instruments in the storage unit 50 (step S101). At that time, the refrigeration cycle control means 33 may store information on the rotational frequency of the inverter 9 in the storage unit 50.

判定 Determining means 35 confirms that the condensation temperature, the evaporation temperature, and the supercooling temperature are stable within the determined ranges as a pre-stage of the determination process of the operation state of the compressor 2. This is because the determination means 35 cannot correctly determine the operating state of the compressor 2 if these temperatures are not stable. In the operation state in which the condensation temperature, the evaporation temperature, and the supercooling temperature are stable, the determination unit 35 determines whether or not the operation state of the compressor 2 is normal based on the discharge gas temperature (step S102). Specifically, the determination unit 35 calculates a temperature difference ΔTd between the detected discharge gas temperature Td1 and the assumed discharge gas temperature Tdsup assumed from the operating state of the compressor 2. Information indicating the relationship between the operating state of the compressor 2 and the assumed discharge gas temperature Tdsup is stored in the memory 31. For example, information indicating the relationship between the rotation frequency of the inverter 9 and the assumed discharge gas temperature Tdsup is stored in the memory 31.

When the determination means 35 calculates ΔTd = | Td1−Tdsup |, it compares the temperature difference ΔTd with the determined threshold value Tth. The threshold Tth is stored in the memory 31. As a result of the comparison, if the temperature difference ΔTd <the threshold value Tth, the determination unit 35 determines that the operating state of the compressor 2 is normal. On the other hand, when the temperature difference ΔTd ≧ the threshold value Vth, the determination unit 35 determines that the operating state of the compressor 2 is abnormal.

In step S102, the determination means 35 may determine whether the maintenance of the compressor 2 is necessary when it is determined that the operation state of the compressor 2 is abnormal. Specifically, the determination unit 35 calculates an assumed refrigerant circulation amount M that is assumed from the condensation temperature, the evaporation temperature, the intake gas temperature, and the rotation frequency of the inverter 9. Then, the determination unit 35 calculates the ratio of the refrigerant circulation amount M1 detected by the flow meter 7 to the assumed refrigerant circulation amount M. Further, the determination unit 35 compares the ratio (M1 / M) of the refrigerant circulation amount with the determined threshold value Mth, and determines that the maintenance of the compressor 2 is necessary when the ratio (M1 / M) is less than the threshold value Mth. To do. The threshold value Mth is stored in the memory 31. If the discharge gas temperature tends to increase and the flow rate of the circulating refrigerant tends to decrease, the compressor 2 is likely to develop a failure. When the discharge gas temperature increases and the flow rate of the circulating refrigerant decreases, the ratio (M1 / M) of the refrigerant circulation amount tends to decrease, so that the necessity of maintenance of the compressor 2 can be determined.

In step S102, when the determination unit 35 determines that the compressor 2 is abnormal, the determination unit 35 displays on the display unit 51 that the compressor 2 is abnormal (step S103). When determining that the maintenance is necessary, the determination unit 35 may display not only that the compressor 2 is abnormal but also that the maintenance is necessary on the display unit 51.

When the display unit 51 displays that the compressor 2 is abnormal, the user contacts the maintenance company of the refrigeration cycle system 1. When the maintenance company receives a notification from the user, the maintenance company dispatches a worker to the place where the refrigeration cycle system 1 is installed on the maintenance inspection work day of the refrigeration cycle system 1. An operator can restore the compressor 2 or replace it with a new compressor so that the compressor 2 can be brought into a normal state before the compressor 2 is suddenly shut down. As a result, it is possible to prevent the operation of the refrigeration cycle system 1 from being suddenly stopped due to a failure of the compressor 2.

When the operation state of the compressor 2 is normal as a result of the determination in step S102 shown in FIG. 4, the usage capacity calculation means 36 uses the detected value accumulated in the storage unit 50 at regular intervals to use the refrigerant circuit. The data of the Mollier diagram corresponding to 40 operating states is calculated, and each enthalpy difference is calculated. Specifically, the use capacity calculation unit 36 obtains a saturation pressure from the detected evaporation temperature, and obtains a first enthalpy h1 from the saturation pressure and the detected intake gas temperature. Further, the use capacity calculating unit 36 obtains a saturation pressure from the detected condensation temperature, and obtains a third enthalpy h3 from the saturation pressure and the detected subcooling temperature.

The used capacity calculation means 36 calculates the used refrigeration capacity Q in the cooling operation by adding the refrigerant circulation amount M1 to the enthalpy difference (h1-h3) (step S104). Specifically, the use capacity calculation means 36 calculates the refrigeration capacity for each determined detection time interval Δt by integrating with time according to the equation (1).

In Equation (1), T is the normal operation time of the compressor 2, and M1 is the refrigerant circulation amount. h 1 is a first enthalpy on the refrigerant suction side of the compressor 2, and h 3 is a third enthalpy on the refrigerant outlet side of the evaporator 4. dt is an operation state detection time interval Δt.

When the usage capacity calculation means calculates the usage refrigeration capacity Q according to the equation (1), the charge calculation means 37 calculates the usage fee C of the refrigeration cycle system according to the expression (2) (step S105).

In equation (2), C is the charge for use of the refrigeration cycle system, and Q is the use refrigeration capacity calculated by equation (1). A is the unit price of the refrigeration capacity used, and B is the basic charge. D is a discount fee. After calculating the usage fee C, the fee calculation unit 37 displays the calculation result on the display unit 51 (step S106). At that time, the charge calculation means 37 calculates the electricity cost of the compressor 2 by multiplying the value obtained by integrating the detected value of the wattmeter 11 by the normal operation time T and the electricity charge per unit time, and calculates the calculation result. You may display on the display part 51. FIG.

The user bears the usage fee C and the electricity bill displayed on the display unit 51. The user can know the cost for the refrigeration cycle system from the information displayed on the display unit 51. The user pays the usage fee C to the maintenance company and pays the electricity bill to the electric company. On the other hand, the maintenance company of the refrigeration cycle system 1 bears the repair cost and replacement cost for maintenance of the compressor 2.

When the refrigeration cycle system 1 is in the heating operation, in step S104 in FIG. 4, the use capacity calculation unit 36 uses the detection values of the flow meter 8 and the supercooling detector 17 for calculation of the heating capacity. In this case, similarly to the first enthalpy h1, the use capacity calculating unit 36 obtains the saturation pressure from the detected condensation temperature, and obtains the second enthalpy h2 from the saturation pressure and the discharge gas temperature. Then, the used capacity calculating means 36 replaces (h1-h3) in the formula (1) with (h2-h3), and calculates the used refrigeration capacity Q. In this way, the used refrigeration capacity Q can be calculated according to the operating state of the refrigeration cycle system 1.

Further, in step S103 shown in FIG. 4, the determination unit 35 may notify the maintenance company of the determination result while displaying the determination result on the display unit 51. For example, an information processing terminal is provided in a maintenance company, and the information processing terminal and the control unit 30 are communicatively connected via a network or the like. In this case, the operation manager of the maintenance company can know the abnormality of the compressor 2 being used by the user earlier.

In the first embodiment, the case where the compressor 2 is a single-stage single screw compressor has been described. However, the compressor 2 is not limited to a single-stage single screw compressor. Even when the compressor 2 is applied to a two-stage single screw compressor, the effect of the first embodiment can be obtained. The compressor 2 is not limited to a single screw compressor. The compressor 2 may be a compressor such as a twin screw compressor, a semi-hermetic reciprocating compressor, and a turbo compressor.

Further, in the first embodiment, the case where the wattmeter 11 detects the power consumption of the inverter 9 has been described. However, it is sufficient that the power consumption of the compressor 2 can be detected, and the compressor 2 is a compressor that does not use the inverter 9. There may be.

The refrigeration cycle system 1 according to the first embodiment includes a determination unit 35 that determines an operating state of the compressor 2, a use capacity calculation unit 36 that calculates a use refrigeration capacity Q when the compressor 2 is normal, and a use Charge calculation means 37 for calculating a charge C for use of the compressor 2 by using the refrigerating capacity Q;

According to the first embodiment, the used refrigeration capacity Q is calculated when it is determined that the compressor 2 is normal based on the discharge gas temperature of the compressor 2, and according to the calculated used refrigeration capacity Q. A usage fee C is imposed on the user. Therefore, a usage fee is not charged to the user when the compressor 2 is used in an abnormal state. Regarding the sharing of the usage charge of the refrigeration cycle system, both the user and the operation manager of the compressor 2 are easily convinced, and the burden is appropriately distributed to each person. Furthermore, the user can suppress not only expenses for operation and management such as maintenance and inspection of the compressor but also a large amount of expenditure due to purchase of the refrigeration cycle system.

The refrigeration cycle system 1 of the first embodiment monitors the operating state of the compressor 2, determines the presence / absence of an abnormality due to a failure of the compressor 2, etc., obtains the used refrigeration capacity Q when there is no abnormality, The usage fee C of the refrigeration cycle system 1 imposed on the user is determined. By imposing a usage fee during normal operation of the compressor 2 on the user, it is possible to reduce the burden on the user regarding the operation management of the refrigeration cycle system 1 and provide an environment in which the refrigeration cycle system 1 can be easily used by the user.

Further, in the first embodiment, when the determination unit 35 determines that the compressor 2 is abnormal, it outputs an alarm. Therefore, the maintenance company can take measures such as repair and replacement of the compressor 2 before the user receives the damage that suddenly causes the operation stop of the compressor 2. As a result, it is possible to prevent the operation of the refrigeration cycle system 1 from being suddenly stopped due to a failure of the compressor 2.

Embodiment 2. FIG.
The refrigeration cycle system of the second embodiment has a management device that manages the operating state of the compressor 2. In the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The configuration of the refrigeration cycle system according to the second embodiment will be described. FIG. 5 is a diagram illustrating a configuration example of a refrigeration cycle system according to Embodiment 2 of the present invention. As shown in FIG. 5, the refrigeration cycle system 1a includes a refrigeration cycle apparatus 60 including a refrigerant circuit 40 and a control device 18a, and a management apparatus 19 that collectively manages information on the operating state and operation commands of the refrigeration cycle apparatus 60. . The control device 18 a is connected to the management device 19 via the network 20. The network 20 is, for example, a LAN (Local Area Network) and the Internet. In this case, the network 20 may be configured by a dedicated LAN, or may be configured by combining the LAN and the Internet.

The server 22 is connected to the network 20. The server 22 is an information processing apparatus used by the maintenance company 21 that manages the operation of the refrigeration cycle apparatus 60. The maintenance company 21 is provided with an information processing terminal 23 that is operated by an operation manager. The information processing terminal 23 is connected to the network 20 via the server 22. The operation manager can access the information stored in the management device 19 via the server 22 by operating the information processing terminal 23. The information processing terminal 23 is, for example, a personal computer (PC). The information processing terminal 23 has a display unit 61. FIG. 5 shows a case where the server 22 is installed in the maintenance company 21, but the server 22 may not be installed in the maintenance company 21. For example, the server 22 may be a server in which a maintenance company has a rental contract with a cloud service provider.

The information processing terminal 25 is connected to the network 20. The information processing terminal 25 is a terminal used by a user of the refrigeration cycle apparatus 60. The information processing terminal 25 is a terminal for a user to input an operation command to the refrigeration cycle apparatus 60. In the second embodiment, the user can change the operation state of the refrigeration cycle apparatus 60 from a location geographically separated from the refrigeration cycle apparatus 60. FIG. 5 shows a case where the information processing terminal 25 is installed in the office 24 separated from the refrigeration cycle apparatus 60 by a certain distance. For example, when the compressor 2 and the heat source side heat exchanger are installed on the roof of a building, the office 24 is installed on the first floor of the building. The information processing terminal 25 has a display unit 51. The information processing terminal 25 is, for example, a PC.

The

information processing terminals

23 and 25 may be desktop PCs or portable information terminals such as smartphones.

FIG. 6 is a diagram illustrating a configuration example of the control device illustrated in FIG. As shown in FIG. 6, the control device 18 a includes a refrigeration cycle control means 33 and a data acquisition means 34. The data acquisition means 34 manages the detection values received from the respective meters of the wattmeter 11, the

flow meters

supercooling detectors

16 and 17. Transmit to device 19. The data acquisition unit 34 may transmit control information of each refrigerant device of the refrigerant circuit 40 to the management device 19. The data acquisition unit 34 transmits, for example, information on the rotational frequency of the inverter 9, the flow path state of the four-way valve 6, and the opening degree of the expansion valve 5 to the management device 19 as the control information of the refrigerant device.

FIG. 7 is a diagram illustrating a configuration example of the management apparatus illustrated in FIG. FIG. 8 is a functional block diagram showing a configuration example of the control unit shown in FIG. As illustrated in FIG. 7, the management device 19 includes a storage unit 50 and a control unit 52. The control unit 52 includes a memory 53 that stores a program, and a CPU 54 that executes processing according to the program. The memory 53 is a non-volatile memory such as a flash memory, for example. As shown in FIG. 8, the control unit 52 includes a determination unit 35, a usage capability calculation unit 36, and a fee calculation unit 37. When the CPU 54 executes the program, the determination unit 35, the use capacity calculation unit 36, and the charge calculation unit 37 are configured in the management device 19.

The determination unit 35 stores the detection value received from the control device 18a in the storage unit 50. Further, when the determination unit 35 determines that the operation state of the compressor 2 is abnormal, the determination unit 35 notifies the charge calculation unit 37 of the determination result. Further, when the determination unit 35 receives a data request signal for requesting operation data of the refrigeration cycle apparatus 60 from the information processing terminal 23, the determination unit 35 transfers the request signal to the fee calculation unit 37. The operation data is detected values of the power meter 11, the

flow meters

supercooling detectors

16 and 17. The operation data may include control information for each refrigerant device of the refrigerant circuit 40.

In the second embodiment, the charge calculation means 37 calculates the use charge C of the refrigeration cycle apparatus 60 according to the equation (2) as the use charge of the refrigeration cycle system. This is because the user does not bear the maintenance cost of the information processing apparatus such as the management apparatus 19 and the server 22. However, when the maintenance company owns the management device 19 and rents the management device 19 to the user, the rental cost of the management device 19 may be included in the usage fee for the refrigeration cycle system.

The fee calculating unit 37 transmits information on the usage fee C to the information processing terminal 25 via the network 20. In addition, when the charge calculation unit 37 receives the determination result that the compressor 2 is abnormal from the determination unit 35, the fee calculation unit 37 transmits the abnormality information indicating that the compressor 2 is abnormal via the network 20 to the information processing terminal 23. Send to. The abnormality information may include information indicating that maintenance is necessary. Furthermore, when the fee calculation unit 37 receives the data request signal from the determination unit 35, the fee calculation unit 37 transmits the operation data to the information processing terminal 23 via the network 20.

Next, the operation of the refrigeration cycle system 1a according to the second embodiment will be described. FIG. 9 is a sequence diagram showing an operation procedure of the refrigeration cycle system shown in FIG. In the second embodiment, detailed description of the same processing as that described with reference to FIG. 4 is omitted. Here, it is assumed that the operation state of the refrigeration cycle apparatus 60 is the cooling operation.

The data acquisition means 34 manages the detection values received from the respective meters of the wattmeter 11, the

flow meters

supercooling detectors

16 and 17. It transmits to the apparatus 19 (step S201). The determination unit 35 stores the detection value received from the control device 18a in the storage unit 50 (step S202).

When the determination unit 35 confirms that the condensation temperature, the evaporation temperature, and the supercooling temperature stored in the storage unit 50 are within the determined ranges, the discharge gas temperature Td1 stored in the storage unit 50 and the memory 53 store them. A temperature difference ΔTd from the assumed discharge gas temperature Tdsup is calculated. And the determination means 35 determines whether the compressor 2 is normal by determining whether it is temperature difference (DELTA) Td <threshold Vth (step S203). Here, a description of whether or not the compressor 2 needs maintenance is omitted.

When the operation state of the compressor 2 is normal as a result of the determination in step S203, the use capacity calculation means 36 calculates the use refrigerating capacity Q according to the equation (1) with reference to the operation data accumulated in the storage unit 50. (Step S204). Subsequently, the charge calculation unit 37 calculates the use charge C according to the equation (2) using the used refrigeration capacity Q calculated in step S204 (step S205). Then, the fee calculation unit 37 transmits information on the usage fee C to the information processing terminal 25 via the network 20. At that time, the charge calculation unit 37 may calculate the electricity cost of the compressor 2 and transmit the information on the electricity cost to the information processing terminal 25.

When the information processing terminal 25 receives the usage fee C information from the management device 19 (step S206), the information processing terminal 25 outputs the usage fee C to the display unit 51 (step S207). The user can know the cost of the compressor 2 from the information displayed on the display unit 51.

On the other hand, if the determination unit 35 determines that there is an abnormality in the compressor 2 in step S203, the charge calculation unit 37 transmits abnormality information indicating that the compressor 2 is abnormal via the network 20 to the information processing terminal 23. (Step S208). When receiving the abnormality information from the management device 19 (Step S209), the information processing terminal 23 outputs an alarm including the abnormality information to the display unit 61 (Step S210). The operation manager of the maintenance company 21 can know that there is an abnormality in the compressor 2 of the user. Furthermore, the operation manager can analyze the operation state of the refrigeration cycle apparatus 60 including the compressor 2 in detail by operating the information processing terminal 23 and accessing the operation data stored in the management apparatus 19.

In the second embodiment, the case where the management device 19 and the server 22 are connected to the network 20 has been described with reference to FIG. 5, but the server 22 may not be provided. The server 22 may have the function of the management device 19. In this case, the server 22 and the management device 19 may be integrated.

Further, the management device 19 is not limited to the operation data of one refrigeration cycle device, but may store operation data of a plurality of refrigeration cycle devices 60. In this case, a plurality of management devices 19 may be provided, and the server 22 may collect operation data stored in each management device 19 from the plurality of management devices 19. The maintenance company 21 can collectively manage the operations of many refrigeration cycle apparatuses 60 scattered over a wide area. In addition, the operation manager of the maintenance company 21 analyzes the operation data of many compressors 2, so that for each type of the compressor 2, the cause of the failure that is likely to occur in the compressor 2 and the appropriate maintenance of the compressor 2. The period and the more accurate life of the compressor 2 can be grasped.

The refrigeration cycle system 1a according to the second embodiment includes a management device 19 connected to the data acquisition unit 34 via the network 20. The management device 19 includes a determination unit 35, a use capacity calculation unit 36, and a charge calculation unit 37. Is included.

According to the second embodiment, the operation data that the management device 19 acquires from the refrigeration cycle device 60 via the network 20 is accumulated. Even if the user of the refrigeration cycle apparatus 60 is remote from the refrigeration cycle apparatus 60, the user can check the usage fee C and the operation data of the refrigeration cycle apparatus 60 by operating the information processing terminal 25 and accessing the management device 19. it can.

The operation manager of the maintenance company 21 can monitor the operation data of the refrigeration cycle apparatus 60 at a remote location of the refrigeration cycle apparatus 60 by operating the information processing terminal 23 and accessing the management apparatus 19. Then, the operation manager operates the information processing terminal 23 and analyzes the operation data accumulated by the management device 19, so that not only the necessity of maintenance of the compressor 2 but also the cause of failure and the life of the compressor 2, etc. Various characteristics can be analyzed.

Conventionally, for example, even if a manufacturer develops a high-efficiency compressor with high energy efficiency for a screw compressor, the manufacturer expresses the degree of energy saving as a numerical value when the high-efficiency compressor is installed in the refrigeration cycle apparatus. It was difficult. One reason for this is that there is no actual data that allows the user to understand how much cost merit is obtained when the compressor used is replaced with a high-efficiency compressor. Therefore, conventionally, it has been difficult to save energy by replacing the compressor in use with a high efficiency compressor.

On the other hand, according to the second embodiment, since the management device 19 accumulates the operation data of the refrigeration cycle device 60, the use refrigeration capacity when the compressor 2 is replaced with a high efficiency compressor is used. The corresponding fee can be calculated. As a result, the user can understand that the usage fee and the electricity bill are cheaper when the high-efficiency compressor is used. The effect of replacement with a high-efficiency compressor can be provided to the user as a numerical value. As a result, both the manufacturer and the user of the refrigeration cycle apparatus 60 are convinced, and replacement with a high efficiency compressor is performed. Replacement with high-efficiency compressors will become active and energy saving will be promoted.

1, 1a refrigeration cycle system, 2 compressor, 3 condenser, 4 evaporator, 5 expansion valve, 6 4-way valve, 7, 8 flow meter, 9 inverter, 10 switchboard, 11 wattmeter, 12 condensation temperature detector, 13 Evaporation temperature detector, 14 suction temperature detector, 15 discharge temperature detector, 16, 17 supercooling detector, 18, 18a control device, 19 management device, 20 network, 21 maintenance company, 22 server, 23 information processing terminal, 24 offices, 25 information processing terminals, 30 control units, 31 memory, 32 CPU, 33 refrigeration cycle control means, 34 data acquisition means, 35 determination means, 36 use capacity calculation means, 37 charge calculation means, 40 refrigerant circuit, 50 Storage unit, 51 display unit, 52 control unit, 53 memory, 54 CPU, 60 cold Cycle device, 61 display unit.

Claims

A refrigerant circuit in which a compressor, a condenser, an evaporator, and an expansion valve are connected and the refrigerant circulates;
A flow meter for detecting the flow rate of the refrigerant circulating in the refrigerant circuit;
An intake temperature detector for detecting an intake gas temperature of refrigerant sucked into the compressor;
A discharge temperature detector for detecting a discharge gas temperature of refrigerant discharged from the compressor;
A condensation temperature detector provided in the condenser for detecting a condensation temperature of the refrigerant;
An evaporation temperature detector provided in the evaporator for detecting the evaporation temperature of the refrigerant;
A subcooling detector provided between the expansion valve and the condenser for detecting a supercooling temperature;
Determining means for determining whether or not the compressor is operating normally based on the discharge gas temperature;
When it is determined that the compressor is operating normally, the refrigeration capacity used from the enthalpy difference and the flow rate determined from the evaporation temperature, the condensation temperature, the suction gas temperature, the discharge gas temperature, and the supercooling temperature Use capacity calculation means for calculating
Charge calculation means for calculating a charge for use of the refrigeration cycle system based on the use refrigeration capacity;
Having a refrigeration cycle system.
Data acquisition means for acquiring detection values from the flow meter, the suction temperature detector, the discharge temperature detector, the condensation temperature detector, the evaporation temperature detector, and the supercooling detector;
A management device connected to the data acquisition means via a network and including the determination means, the usage capacity calculation means, and the charge calculation means;
The refrigeration cycle system according to claim 1, further comprising:
Further comprising a refrigeration cycle apparatus comprising the refrigerant circuit;
The refrigeration cycle system according to claim 1 or 2, wherein the fee calculation means calculates a usage fee for the refrigeration cycle apparatus as a usage fee for the refrigeration cycle system.
The use capacity calculation means includes:
When the operation state is a cooling operation, the first enthalpy obtained from the saturation pressure of the evaporation temperature and the suction gas temperature, and the third enthalpy obtained from the saturation pressure of the condensation temperature and the subcooling temperature are calculated as the enthalpy difference. The difference between the second enthalpy obtained from the saturated pressure of the condensation temperature and the discharge gas temperature is calculated as the enthalpy difference when the operation state is heating operation. Item 4. The refrigeration cycle system according to any one of Items 1 to 3.