JP2012202581A - Refrigeration cycle device and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration cycle device capable of performing an efficient front-loaded operation while taking the capacity of a compressor into consideration.SOLUTION: When performing a front-loaded operation, the refrigeration cycle device 100 determines the operation time of the front-loaded operation based on an operation frequency of the compressor 1 at the time when the efficiency of the refrigeration cycle is the maximum, the operation frequency being lower than the operation frequency of the compressor 1 at the time when the compressor 1 exerts its maximum capacity.

Description

  The present invention relates to a refrigeration cycle apparatus capable of performing forward operation so that the room temperature reaches a predetermined temperature at a predetermined set time and a control method thereof.

  Conventionally, there is an air conditioner that is one of the refrigeration cycle apparatuses that can perform forward operation so that the room temperature reaches a predetermined temperature at a predetermined set time. As such, a temperature difference information calculation unit, a correction graph information holding unit, a forward time determination unit, and a rise time correction processing unit are provided, and air conditioning equipment is driven forward by the forward operation time obtained in the forward time determination unit. In addition, an air conditioner forward operation control system is disclosed in which the next or next forward operation time is determined based on the content of the correction graph information holding unit corrected by the rise time correction processing unit (for example, Patent Document 1).

  The air conditioning equipment advance operation control system described in Patent Literature 1 includes an air conditioning equipment 1-i, a sensor 2-i (sensor 2′-i), a temperature difference information calculation unit 3, a correction graph information holding unit 4, It is executed by the advance time determination unit 5, the rise time correction processing unit 6, and the corrected correction graph information holding unit in which the corrected correction graph information is stored. In FIG. 2 of Patent Document 1, the horizontal axis represents temperature difference information Δt (° C.), and the vertical axis represents forward operation time H (minutes). The right side (right side of the drawing) of FIG. 2 in Patent Document 1 corresponds to, for example, heating control, and the left side (left side of the drawing) corresponds to, for example, cooling control.

  Air conditioners 1-i (i = 1, 2,...) Indicate a plurality of air conditioners (hereinafter referred to as air conditioners) that are subject to forward control. The sensor 2-i (i = 1, 2,...) Detects the outside air temperature and the room temperature. The temperature difference information calculation unit 3 calculates temperature difference information based on the indoor temperature and the outside air temperature corresponding to the indoor target temperature and the operation start time as much as possible at least at a predetermined time. The correction graph information holding unit 4 stores correction graph information for indexing the forward operation time for starting the forward operation from the temperature difference information.

  The advance time determination unit 5 determines the advance operation time based on the output from the temperature difference information calculation unit and the contents of the correction graph information holding unit. The rise time correction processing unit 6 measures the time until the indoor target temperature is actually obtained by the air conditioner activated based on the advance operation time obtained in the advance time determination unit 5 and determines the air conditioner according to the time. The correction graph information corresponding to the advance time is corrected. The correction graph information holding unit 7 represents a corrected correction graph information holding unit in which corrected correction graph information is stored.

  The correction graph information holding unit 4 stores information related to a correction graph such as a thick line shown in FIG. For example, when the temperature difference information Δt is the value X2, the advance time H is selected as the value Y1, and the operation is started before the value Y1 (minutes). The temperature difference information calculation unit 3 acquires the indoor target temperature TR, the indoor temperature Tr, and the outside air temperature Toa, for example, in the first step of the flowchart shown in FIG. In the next step, the temperature difference information Δt is calculated and the result is output. However, in the calculation of the temperature difference information Δt, “β” is used as a coefficient.

  Based on the temperature difference information Δt obtained in the next step and the content of the correction graph information holding unit 4, the advance time determination unit 5 performs the advance operation correspondingly if the temperature difference information Δt is, for example, the value X2. The value Y1 is determined as the time H. Then, an advance operation is instructed to a predetermined air conditioner 1-i. By controlling in this way, each air conditioner 1-i is driven forward.

  However, in reality, an error occurs between the result of indexing the correction graph information and the time for actually reaching the desired indoor target temperature. If the rising time correction processing unit 6 reaches the indoor target temperature at, for example, the time H is Y′1 (minutes) after entering the forward operation under the predetermined temperature difference information value X2, the correction graph information Is rewritten from a graph passing through (X1, Y0), (X2, Y1), (X3, Y2) to a graph passing through (X1, Y0), (X2, Y′1), (X3, Y2). Then, the result is stored in the corrected correction graph information holding unit 7. The content of the holding unit is used as the content of the correction graph information holding unit 4 in the next control, for example.

JP-A-60-142136 (page 2-3, FIGS. 1-3)

  In the forward operation control as described in Patent Document 1, the advance time is basically examined based on the maximum capacity that can be supplied by the air conditioner. However, in general, in the case of an air conditioner equipped with an inverter-controlled compressor, the operating frequency (operating point) for supplying the maximum capacity is not necessarily the most efficient operating point as the air conditioner. is there. As a result, it is assumed that the driving efficiency is poor even in the time zone in which the forward driving is performed. The purpose of the forward operation is to set the room temperature to a predetermined temperature at a predetermined time, and it is not necessary to perform the process from the start of operation to the predetermined temperature at full speed operation. On the other hand, it was a lossy operation from the viewpoint of energy saving.

  The present invention was made to solve the above-described problems, and an object of the present invention is to provide a refrigeration cycle apparatus capable of efficient forward operation and a control method thereof while considering the capacity of the compressor. Yes.

  The refrigeration cycle apparatus according to the present invention has a refrigeration cycle in which an inverter compressor, a heat source side heat exchanger, a throttling device, and a use side heat exchanger are connected by piping, and a refrigerant circulates at a predetermined time. In the refrigeration cycle apparatus that performs forward operation so as to reach a predetermined target temperature, when performing the forward operation, the inverter compressor has a lower operating frequency than when the inverter compressor exhibits maximum capacity, And the operating time of the said forward operation is determined based on the operating frequency of the said inverter compressor when the efficiency of the said refrigerating cycle becomes the maximum.

  A control method for a refrigeration cycle apparatus according to the present invention has a refrigeration cycle in which an inverter compressor, a heat source side heat exchanger, a throttling device, and a use side heat exchanger are pipe-connected and a refrigerant circulates. In the control method of the refrigeration cycle apparatus that performs forward operation so as to reach a predetermined target temperature at a time, when executing the forward operation, the target temperature, the temperature of the target region at the start of the forward operation, and When the temperature difference information calculated based on the outside air temperature at the start of the forward operation, the operation frequency of the inverter compressor when the inverter compressor exhibits its maximum capacity, and the efficiency of the refrigeration cycle are maximized The operation time of the forward operation is determined based on the operation frequency of the inverter compressor.

  According to the refrigeration cycle apparatus according to the present invention, efficient forward operation can be performed while considering the capacity of the compressor. Therefore, according to the refrigeration cycle apparatus according to the present invention, although the operation time of the forward operation is longer than that of the conventional technique, it is possible to achieve energy saving as a result.

  According to the control method of the refrigeration cycle apparatus according to the present invention, efficient forward operation can be performed while considering the capacity of the compressor. Therefore, according to the control method for the refrigeration cycle apparatus according to the present invention, although the operation time of the forward operation is longer than that of the prior art, it is possible to achieve energy saving as a result.

It is a schematic block diagram which shows an example of the refrigerant circuit structure of the air conditioning apparatus which concerns on embodiment of this invention. It is the schematic conceptual diagram which showed notion the forward driving | running | working which the air conditioning apparatus which concerns on embodiment of this invention performs. It is a graph which shows an example of the correction graph of an refrigeration cycle device concerning an embodiment of the invention, and an example of the mode of correction processing. It is a flowchart which shows the flow of the control processing at the time of performing the forward running operation which the refrigeration cycle apparatus which concerns on embodiment of this invention performs. It is a graph which shows the performance characteristic of the air conditioning apparatus carrying the general inverter compressor. It is a graph which shows the result of having compared the state in the air-conditioning apparatus which concerns on embodiment of this invention, and the prior operation of a prior art. It is a graph which shows the result of having compared the state in the air-conditioning apparatus which concerns on embodiment of this invention, and the prior operation of a prior art. It is a graph which shows the result of having compared the state in the air-conditioning apparatus which concerns on embodiment of this invention, and the prior operation of a prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating an example of a refrigerant circuit configuration of an air-conditioning apparatus 100 according to an embodiment of the present invention. Based on FIG. 1, the refrigerant circuit structure and operation | movement of the air conditioning apparatus 100 are demonstrated. This air conditioner 100 shows an example of a refrigeration cycle apparatus that performs vapor compression refrigeration cycle operation. The air conditioner 100 is installed in, for example, a building or a condominium, and can perform a cooling operation or a heating operation. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

[Constitution]
The air conditioner 100 includes two outdoor units 31 (outdoor unit 31a and outdoor unit 31b) and two indoor units 32 (indoor unit 32a and indoor unit 32b). In the air conditioner 100, the outdoor unit 31 and the indoor unit 32 are connected by two pipes (a liquid pipe 102 and a gas pipe 101). Further, the air conditioner 100 includes a control device 50 that controls the operation of various actuators (the compressor 1, the blower not shown, the four-way valve 2, and the expansion device 22 to execute the operation of the air conditioner 100. Yes.

[Outdoor unit 31]
The outdoor unit 31 has a function of supplying cold or warm heat to the indoor unit 32. In FIG. 1, “a” is added after the code of each device provided in the “outdoor unit 31a”, and “b” is added after the code of each device provided in the “outdoor unit 31b”. It is illustrated. In the following description, “a” and “b” after the reference may be omitted, but it goes without saying that both the outdoor unit 31a and the outdoor unit 31b are equipped with each device.

  The outdoor unit 31 includes a compressor 1, a four-way valve 2 that is a flow path switching unit, an outdoor heat exchanger (heat source side heat exchanger) 3, and an accumulator 4, which are connected in series to form a main refrigerant. It is mounted so as to constitute a circuit. Further, the outdoor unit 31 may be provided with a blower (not shown) for supplying air to the outdoor heat exchanger 3. However, the outdoor heat exchanger 3 may perform heat exchange with a heat medium other than air.

  The compressor 1 sucks a refrigerant and compresses the refrigerant to a high temperature / high pressure state, and is composed of an inverter compressor capable of capacity control. The four-way valve 2 is provided on the discharge side of the compressor 1 and switches between a refrigerant flow during the heating operation and a heat source side refrigerant flow during the cooling operation. The outdoor heat exchanger 3 functions as an evaporator during heating operation, functions as a condenser (radiator) during cooling operation, and performs heat exchange between a heat medium (for example, air or water) and a refrigerant, The refrigerant is evaporated or condensed and liquefied. The accumulator 4 is provided on the suction side of the compressor 1 and stores excess refrigerant. Note that the four-way valve 2 is not necessarily provided in a model in which the cooling operation and the heating operation cannot be switched. Further, the accumulator 4 is not essential.

  The outdoor unit 31 is provided with at least an outdoor air temperature sensor 9 that detects the temperature of the air taken into the outdoor heat exchanger 3 (outside air temperature). The temperature information detected by the outside air temperature sensor 9 is sent to the control device 50 that controls the operation of the air conditioner 100, and the driving frequency of the compressor 1, the rotational speed of the blower (not shown), and the four-way valve 2. This is used for switching and controlling the opening degree of the expansion device 22 and the like.

[Indoor unit 32]
The indoor unit 32 receives a supply of cold or warm heat from the outdoor unit 31 and takes charge of a cooling load or a heating load. In FIG. 1, “a” is added after the code of each device provided in “indoor unit 32a”, and “b” is added after the code of each device provided in “indoor unit 32b”. It is illustrated. In the following description, “a” and “b” after the reference may be omitted, but it goes without saying that both the indoor unit 32a and the indoor unit 32b are equipped with each device.

  In the indoor unit 32, an indoor heat exchanger (use side heat exchanger) 21 and an expansion device 22 are mounted connected in series. A blower (not shown) for supplying air to the indoor heat exchanger 21 may be provided. However, the indoor heat exchanger 21 may perform heat exchange between the refrigerant and a heat medium different from the refrigerant such as water.

  The indoor heat exchanger 21 functions as a condenser (radiator) during heating operation, functions as an evaporator during cooling operation, and performs heat exchange between a heat medium (for example, air or water) and a refrigerant, The refrigerant is condensed or liquefied or evaporated. The expansion device 22 functions as a pressure reducing valve or an expansion valve, and expands the refrigerant by reducing the pressure. The throttling device 22 may be constituted by a device whose opening degree can be variably controlled, for example, a precise flow rate control means using an electronic expansion valve, an inexpensive refrigerant flow rate control means such as a capillary tube, or the like.

  The indoor unit 32 is provided with at least an indoor temperature sensor 23 that detects the temperature (indoor temperature) of the air taken into the indoor heat exchanger 21. The temperature information detected by the indoor temperature sensor 23 is sent to the control device 50 that controls the operation of the air conditioner 100, and the drive frequency of the compressor 1, the rotational speed of the blower (not shown), and the four-way valve 2. This is used for switching and controlling the opening degree of the expansion device 22 and the like.

  In addition, the compressor 1 should just be what can be inverter-controlled, and does not specifically limit a type. For example, the compressor 1 can be configured using various types such as reciprocating, rotary, scroll, or screw. Further, the type of refrigerant used in the air conditioner 100 is not particularly limited. For example, natural refrigerants such as carbon dioxide, hydrocarbons, and helium, alternative refrigerants that do not contain chlorine such as HFC410A, HFC407C, and HFC404A, or existing refrigerants. Any of chlorofluorocarbon refrigerants such as R22 and R134a used in products may be used.

  The control device 50 that controls the operation of the air conditioner 100 may be provided in either the outdoor unit 31 or the indoor unit 32, or may be provided outside the outdoor unit 31 and the indoor unit 32. . Further, the control device 50 may be divided into a plurality according to the function and provided in each of the outdoor unit 31 and the indoor unit 32. In this case, each control device 50 may be connected wirelessly or by wire to enable communication.

[Operation]
A basic operation performed by the air conditioner 100 will be described.
The air conditioner 100 can perform a cooling operation or a heating operation with the indoor unit 32 based on an instruction from the indoor unit 32. The operation mode executed by the air conditioner 100 includes a cooling operation mode in which all of the driven indoor units 32 execute a cooling operation, and a heating operation mode in which all of the driven indoor units 32 execute a heating operation. is there.

[Cooling operation mode]
The low-temperature / low-pressure refrigerant is compressed by the compressor 1 (the compressor 1a and the compressor 1b) and discharged as a high-temperature / high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 (outdoor heat exchanger 3a and outdoor heat exchanger 3b) via the four-way valve 2 (four-way valve 2a and four-way valve 2b). To do. The refrigerant flowing into the outdoor heat exchanger 3 is condensed and liquefied while dissipating heat to the outdoor air in the outdoor heat exchanger 3. The high-pressure liquid refrigerant that has flowed out of the outdoor heat exchanger 3 flows out of the outdoor unit 31 (the outdoor unit 31a and the outdoor unit 31b).

  The high-pressure liquid refrigerant that has flowed out of the outdoor unit 31 flows into the indoor unit 32 (the indoor unit 32a and the indoor unit 32b) through the liquid pipe 102. The liquid refrigerant that has flowed into the indoor unit 32 is throttled by the expansion device 22 (the expansion device 22a and the expansion device 22b) and becomes a low-temperature gas-liquid two-phase refrigerant. This low-temperature gas-liquid two-phase refrigerant flows into the indoor heat exchanger 21 (the indoor heat exchanger 21a and the indoor heat exchanger 21b), cools the air-conditioned space by taking heat away from the surroundings, and evaporates and It vaporizes and flows out from the indoor heat exchanger 21.

  The refrigerant that has flowed out of the indoor heat exchanger 21 returns to the outdoor unit 31 via the gas pipe 101. The gas refrigerant returned to the outdoor unit 31 is again sucked into the compressor 1 through the four-way valve 2 (four-way valve 2a and four-way valve 2b) and the accumulator 4 (accumulator 4a and accumulator 4b). With the above flow, the air conditioner 100 performs the cooling operation.

[Heating operation mode]
The low-temperature / low-pressure refrigerant is compressed by the compressor 1 (the compressor 1a and the compressor 1b) and discharged as a high-temperature / high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows through the gas pipe 101 via the four-way valve 2 (four-way valve 2a and four-way valve 2b), and from the outdoor unit 31 (outdoor unit 31a and outdoor unit 31b). leak. The high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 31 flows into the indoor unit 32 (the indoor unit 32a and the indoor unit 32b) through the gas pipe 101. The gas refrigerant flowing into the indoor unit 32 flows into the indoor heat exchanger 21 (the indoor heat exchanger 21a and the indoor heat exchanger 21b), and heats the air-conditioned space by dissipating heat to the surroundings with the indoor heat exchanger 21. , Itself condenses and liquefies and flows out of the indoor heat exchanger 21. The liquid refrigerant flowing out of the indoor heat exchanger 21 is throttled to an intermediate pressure by the expansion device 22 (the expansion device 22a and the expansion device 22b).

  The gas-liquid two-phase refrigerant that has been throttled to a low pressure by the throttle device 22 returns to the outdoor unit 31 via the liquid pipe 102. The gas-liquid two-phase refrigerant returned to the outdoor unit 31 flows into the outdoor heat exchanger 3 (the outdoor heat exchanger 3a and the outdoor heat exchanger 3b). The low-pressure gas-liquid two-phase refrigerant that has flowed into the outdoor heat exchanger 3 evaporates and vaporizes while taking heat from the outdoor air in the outdoor heat exchanger 3, and then flows out of the outdoor heat exchanger 3. The gas refrigerant flowing out of the outdoor heat exchanger 3 is again sucked into the compressor 1 through the four-way valve 2 and the accumulator 4 (accumulator 4a and accumulator 4b). With the above flow, the air conditioner 100 performs the heating operation.

  FIG. 2 is a schematic conceptual diagram conceptually showing the forward running operation performed by the air conditioning apparatus 100. FIG. 3 is a graph illustrating an example of a correction graph and an example of a mode of correction processing. FIG. 4 is a flowchart showing a flow of control processing when the forward driving is executed. FIG. 5 is a graph showing performance characteristics of an air conditioner equipped with a general inverter compressor. 6-8 is a graph which shows the result of having compared the state in the air-conditioning apparatus 100 and the prior operation of a prior art. Based on FIGS. 2-8, the forward operation which the air conditioning apparatus 100 performs is demonstrated, comparing with a prior art.

  As shown in FIG. 2, the control device 50 includes a temperature difference information calculation unit 53, a correction graph information holding unit 54, a forward time determination unit 55, a rise time correction processing unit 56, and corrected correction graph information. And a corrected correction graph information holding unit 57 to be stored. 2 correspond to the outside air temperature sensor 9 and the indoor temperature sensor 23 shown in FIG. The target device 51-i (i = 1, 2,...) Corresponds to the connected indoor unit 32.

  The temperature difference information calculation unit 53 calculates temperature difference information based on a predetermined indoor target temperature, an indoor temperature corresponding to the operation start time, and an outdoor air temperature at least at a time predetermined by the user. is there. The correction graph information holding unit 54 stores correction graph information for extracting the operation time of the forward operation from the temperature difference information calculated by the temperature difference information calculation unit 53. The correction graph information holding unit 54 stores information related to a correction graph such as a line C shown in FIG. The advance time determination unit 55 determines the operation time of the advance operation based on the output from the temperature difference information calculation unit 53 and the contents of the correction graph information holding unit 54.

  The rise time correction processing unit 56 measures the time until the indoor target temperature is actually obtained by the indoor unit 32 activated based on the operation time of the forward operation obtained in the advance time determination unit 55. The rise time correction processing unit 56 corrects the correction graph information corresponding to the time by moving the indoor unit 32 forward by the time. The corrected correction graph information holding unit 57 stores the correction graph information corrected by the rise time correction processing unit 56. The correction graph information holding unit 54 and the corrected correction graph information holding unit 57 may be configured to share the same storage unit, or may be configured separately by different storage units.

  Based on FIG. 5, the performance characteristic of the air conditioning apparatus which mounts a general inverter compressor is demonstrated. In FIG. 5, the left vertical axis represents the cooling energy consumption efficiency (COP), the right vertical axis represents the cooling capacity (kW), and the horizontal axis represents the operating frequency (Hz) of the compressor. In FIG. 5, the compression function force is represented by a line A, and the COP is represented by a line B.

  In general, there is an operating point at which efficiency is most improved in the middle of the control range of the inverter compressor. For example, if the line A in FIG. 5 is the control range of the inverter compressor, there is an operation frequency (operation point) that exhibits the maximum capacity as the inverter compressor somewhere in the range. However, the operating point at which the efficiency of the inverter compressor is maximized does not necessarily coincide with the operating point at which the operating efficiency of the air conditioner is maximized. The operating point for maximizing the operating efficiency of the air conditioner is often smaller than the frequency at which the efficiency of the inverter compressor is maximized. If it does so, as an inverter compressor, it will drive | operate in the point where efficiency falls.

  From FIG. 5, when the operating frequency of the inverter compressor is 60 Hz, the supply capacity of the inverter compressor (at the time of cooling) is 42 kW and COP 3.06, and when the frequency of the inverter compressor is 80 Hz, the supply capacity of the inverter compressor It can be seen that (at the time of cooling) is 56 kW and COP 3.00. Therefore, when the operating point of the inverter compressor operating frequency is 60 Hz, the supply capacity as the inverter compressor is lower than that when the operating point of the inverter compressor operating frequency is 80 Hz, but the operating efficiency is 2%. (3.06 / 3.00) will be higher.

  Therefore, in the air conditioner 100, the forward operation is executed in consideration of the relationship between “the capacity of the inverter compressor” and “the operation efficiency of the air conditioner”. The control device 50 determines the operation time of the forward operation by using the supply capability when the compressor 1 is operating at the most efficient operation frequency (for example, 60 Hz) at the time of calculating the operation time of the forward operation. Then, the compressor 1 is operated at the most efficient operating frequency of the air conditioner 100 according to the determined operating time of the forward operation.

  Based on FIG.3 and FIG.4, the forward running operation which the air conditioning apparatus 100 performs is demonstrated in detail. In FIG. 3, the horizontal axis represents the temperature difference information Δt (° C.), and the vertical axis represents the operation time H (minute) of the forward operation. 3 corresponds to, for example, heating control, and the left side from the center (left side of the sheet) corresponds to, for example, cooling control. From FIG. 3, for example, when the temperature difference information Δt is the value X2, it can be seen that Z1 corresponding to the value X2 is determined as the advance time H, and the operation is started before the value Z1. In FIG. 3, Z0 (Y0 <Z0), Z1 (Y1 <Z1), Z2 corresponding to Y0, Y1, Y2, Y3, Y4, Y′1 shown in FIG. (Y2 <Z2), Z3 (Y3 <Z3), Z4 (Y4 <Z4), Z′1 (Y′1 <Z′1), and the forward movement time is longer than that of the conventional one.

  Based on FIG. 4, the flow of the control processing when executing the forward operation will be described. First, the temperature difference information calculation unit 53 acquires the indoor target temperature TR, the indoor temperature Tr, and the outside air temperature Toa (step S101). Then, the temperature difference information calculation unit 53 calculates the temperature difference information Δt based on the acquired indoor target temperature TR, indoor temperature Tr, and outside air temperature Toa (step S102). The temperature difference information Δt may be calculated based on the expression | (TR−Tr) + (Tr−Toa) × β |. In this equation, β represents a coefficient.

  Next, the advance time determination unit 55 determines the operation time of the advance operation based on the temperature difference information Δt calculated by the temperature difference information calculation unit 53 and the contents stored in the correction graph information holding unit 54 (step S103). ). Here, the temperature difference information Δt includes an operating frequency (for example, 80 Hz) when the compressor 1 exhibits its maximum capacity and an operating frequency (for example, the operating frequency of the compressor 1 when the efficiency of the air conditioner 100 is maximized). 60 Hz) is set. That is, as shown in FIG. 3, the operation time H of the forward operation associated with the temperature difference information Δt is set in advance so as to be longer than the conventional one. For example, if the temperature difference information Δt is the value X2, the advance time determination unit 55 determines the value Z1 corresponding to the value X2 as the operation time H of the advance operation. When the operation time H of the forward operation is determined, the advance time determination unit 55 instructs the predetermined target device 51-i to perform the forward operation (step S104). In this way, each target device 51-i is driven forward.

  However, in reality, an error occurs between the result extracted from the correction graph information holding unit 54 and the time required to actually reach the desired indoor target temperature. Therefore, the rise time correction processing unit 56 measures the time until the indoor target temperature is actually obtained by the target device 51-i activated based on the operation time H of the forward operation (step S105). Then, the rise time correction processing unit 56 measures the correction graph information, for example, (X1,1) when it has measured that the indoor target temperature has been reached at, for example, Z′1 earlier than Z1 after entering the forward operation under the value X2. The graph passing through (Z0), (X2, Z1), (X3, Z2) is rewritten to a graph passing through (X1, Z0), (X2, Z′1), (X3, Z2) (step S106).

  Thereafter, the rising time correction processing unit 56 stores the corrected graph in the corrected graph correction information holding unit 57. The correction content stored in the corrected correction graph information holding unit 57 is used as the content of the correction graph information holding unit 54, for example, in the next control.

  Based on FIGS. 6-8, the result of having compared the forward operation which the air conditioning apparatus 100 performs, and the forward operation in a prior art is demonstrated. 6 to 8, the horizontal axis represents the time (minutes) including the forward operation start time to the designated time, the vertical axis represents the compressor frequency (Hz) in FIG. 6, and the supply capacity (kW) in FIG. 7. FIG. 8 shows the power consumption (kWh).

  As shown in FIG. 6, in the forward operation in the air conditioner 100, since the supply capacity of the compressor 1 is small (for example, the operation frequency is 60 Hz), the operation start time, that is, the time when the forward operation is started is compared with the prior art. Get faster. On the other hand, as shown in FIG. 7, the supply capability required when the room temperature is lowered to the set temperature is the same as that of the prior art. Therefore, as shown in FIG. 8, the final power consumption in the air-conditioning apparatus 100 is smaller than that in the prior art. As a result, according to the air conditioning apparatus 100, it is possible to save energy compared to the conventional technology. In addition, although it demonstrated on the assumption of air_conditionaing | cooling operation, the case of heating operation is also the same.

  In the air conditioner 100, although the basic control of the forward operation is the same as that of the conventional method, the operation start time of the forward operation is set earlier than the conventional method in order to calculate the operation time of the forward operation longer. . That is, the driving start time for the forward driving is set longer than that of the conventional method so that the forward driving executed by the user until a predetermined time is extended. Therefore, according to the air conditioning apparatus 100, efficient forward operation can be executed while considering the capacity of the compressor 1. Therefore, according to the air conditioning apparatus 100, it becomes possible to save energy compared with the prior art.

  The forward operation performed by the air conditioner 100 is particularly effective when there is no or almost no heat dissipation loss from the room to the outdoors. For example, in the case of a load condition with a large heat dissipation loss to the outdoors, it may be better to drive forward in a short period of time, even if the efficiency is slightly worse, rather than performing a forward drive over a long period of time. In addition to the forward operation performed by the air conditioner 100, it is preferable that the conventional forward operation can be performed. In the forward operation performed by the air conditioner 100 and the conventional forward operation, a selection means such as a remote control operation or a DIP switch (dip switch) provided on the control board is operated on the user side in consideration of installation conditions. It is good to be able to switch at the time.

  In the present embodiment, an example is shown in which there are two outdoor units 31, but it is obvious that the same effect can be obtained with three or more outdoor units 31. Moreover, although the case where the target device 51-i is the indoor unit 32 has been illustrated as an example, the target device is not limited to the indoor unit 32, and may be a water heater used as a load side, for example. . Further, in the embodiment, the case where the present invention is applied to the air conditioner 100 has been described as an example. However, the present invention is also applied to other systems in which a refrigerant circuit is configured using a refrigeration cycle such as a refrigeration system. can do.

  1 compressor, 1a compressor, 1b compressor, 2 four-way valve, 2a four-way valve, 2b four-way valve, 3 outdoor heat exchanger, 3a outdoor heat exchanger, 3b outdoor heat exchanger, 4 accumulator, 4a accumulator, 4b accumulator, 9 outdoor temperature sensor, 21 indoor heat exchanger, 21a indoor heat exchanger, 21b indoor heat exchanger, 22 expansion device, 22a expansion device, 22b expansion device, 23 indoor temperature sensor, 31 outdoor unit, 31a outdoor Machine, 31b outdoor unit, 32 indoor unit, 32a indoor unit, 32b indoor unit, 50 control device, 51 target device, 52 sensor, 53 temperature difference information calculation unit, 54 correction graph information holding unit, 55 forward time determination unit, 56 Rise time correction processing unit, 57 corrected correction graph information holding unit, 100 air conditioner, 101 gas pipe 102 liquid pipe.

Claims (6)

The inverter compressor, the heat source side heat exchanger, the expansion device, and the use side heat exchanger are connected by piping and have a refrigeration cycle in which the refrigerant circulates, so that a predetermined target temperature is reached at a predetermined time. In the refrigeration cycle apparatus that performs forward operation,
When performing the advance operation,
Based on the operating frequency of the inverter compressor when the efficiency of the refrigeration cycle is smaller than the operating frequency of the inverter compressor when the inverter compressor exhibits its maximum capacity and the efficiency of the refrigeration cycle is maximized. A refrigeration cycle apparatus characterized in that the operation time is determined. The driving time of the forward driving is
2. The temperature difference information calculated based on the target temperature, the temperature of the target region at the start of the forward operation, and the outside air temperature at the start of the forward operation, is associated in advance. Refrigeration cycle equipment. The temperature difference information is
3. The refrigeration according to claim 2, wherein the refrigeration is calculated using an expression of the following formula: | (the target temperature−the temperature of the target region) + (the temperature of the target region−the outside air temperature) × the coefficient β |. Cycle equipment. 4. The refrigeration cycle apparatus according to claim 2, wherein the association between the operation time of the forward operation and the temperature difference information can be corrected according to a time until the target temperature is reached. . A forward-running operation determined based on the operating frequency of the inverter compressor when the efficiency of the refrigeration cycle is smaller than the operating frequency of the inverter compressor when the inverter compressor exhibits its maximum capacity. Driving time,
The operation time of the forward operation determined based on the operation frequency of the inverter compressor when the inverter compressor exhibits the maximum capacity is made selectable. The refrigeration cycle apparatus according to one item. The inverter compressor, the heat source side heat exchanger, the expansion device, and the use side heat exchanger are connected by piping and have a refrigeration cycle in which the refrigerant circulates, so that a predetermined target temperature is reached at a predetermined time. In the control method of the refrigeration cycle apparatus that executes the forward operation,
When performing the advance operation,
Temperature difference information calculated based on the target temperature, the temperature of the target area at the start of the forward operation, and the outside air temperature at the start of the forward operation,
The operating frequency of the inverter compressor when the inverter compressor exhibits maximum capacity,
The control method for the refrigeration cycle apparatus, wherein the operation time of the forward operation is determined based on an operation frequency of the inverter compressor when the efficiency of the refrigeration cycle is maximized.

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