WO2020090112A1

WO2020090112A1 - Air conditioning device

Info

Publication number: WO2020090112A1
Application number: PCT/JP2018/040866
Authority: WO
Inventors: 耕司松澤; 服部　太郎
Original assignee: 三菱電機株式会社
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2020-05-07
Also published as: JPWO2020090112A1; DE112018008116T5; JP6972378B2

Abstract

This air conditioning device is provided with: a first heat medium circuit in which a first pump that delivers a first heat medium supplied from a heat source apparatus and a heat storage tank, through which flows the first heat medium delivered by the first pump, are connected by piping; a second heat medium circuit in which a second pump that delivers a second heat medium, a heat storage tank in which heat exchange is performed between the first heat medium and the second heat medium, and aa usage-side heat exchanger that performs heat exchange between the second heat medium delivered by the second pump and a usage-side heat medium to be air-conditioned are connected by piping; and a control unit that continues the operation of the first pump and stops the operation of the second pump when a surplus power detecting unit for detecting a surplus of power supplied from an independent power generator detects that there is a surplus of generated power, and when a target temperature detected by a usage-side temperature detecting unit for detecting the target temperature of an air conditioning target, is equal to or greater than an upper limit temperature threshold.

Description

Air conditioner

The present invention relates to an air conditioner that works with an in-house power generator.

Conventionally, in a relatively small building such as a private house or an apartment, an air conditioner that works with an in-house power generator is installed. Examples of the private power generation device include a power generation device using natural energy such as a solar power generation device. The air conditioner stores heat supplied from a heat source device such as a heat pump outdoor unit using a refrigerant and an electric heater, for example, in a heat storage tank connected to the heat medium circuit, by hot or cold heat stored in the heat storage tank. Perform heating or cooling.

Here, in Europe, floor heating by water circulation, air conditioning systems such as radiators or fan coils are generally used. 2. Description of the Related Art In recent years, photovoltaic power generation has become widespread in general houses, and a heat storage tank that temporarily stores heat obtained by photovoltaic power generation is connected to an air conditioning circuit. Patent Document 1 discloses a control device that controls a bathroom hot water supply device that operates in conjunction with a solar power generation device. In Patent Document 1, before the start time of using the bathtub, the generated power acquired by the power acquisition unit becomes larger than the demand power, and the hot water serving as the heat medium can be provided for the user. At this time, the control device operates electric heating devices such as a bathroom hot water supply device and an air conditioner so that the temperature of the heat medium becomes higher than the temperature during actual use. As a result, when the user actually takes a bath, the temperature of the bathtub falls to an appropriate temperature over time. That is, in Patent Document 1, when the generated power becomes excessive, the set temperature of the air-conditioning room or the set temperature of the bathroom hot water is changed to store heat, thereby attempting to save energy.

JP, 2017-156018, A

However, the control device disclosed in Patent Document 1 changes the preset temperature of the air-conditioning room or the preset hot water supply for the bathroom to raise the temperature of the heat medium in advance above the temperature during actual use. Therefore, if the bathing time is earlier than planned, the temperature of the bathtub is not lowered, which may impair the comfort of the user.

The present invention has been made to solve the above problems, and provides an air conditioner that does not impair the comfort of the user.

In the air conditioner according to the present invention, the first pump that conveys the first heat medium supplied from the heat source device and the heat storage tank in which the first heat medium that is conveyed by the first pump flows are connected by piping. The first heat medium circuit connected, the second pump that conveys the second heat medium, the heat storage tank that exchanges heat between the first heat medium and the second heat medium, and the second pump A second heat medium circuit in which a second heat medium that has been conveyed and a heat exchanger on the use side for exchanging heat with the heat medium on the use side to be air-conditioned are connected by piping, and the generated power supplied from the private power generator Is detected as surplus by the surplus power detection unit that detects that the target temperature of the air conditioning target is detected by the user side temperature detection unit that is equal to or higher than the upper limit temperature threshold value. In that case, continue the operation of the first pump, One and a control unit for stopping the operation of the second pump, the.

According to the present invention, when it is detected that the generated power is excessive and the target temperature is equal to or higher than the upper limit temperature threshold, the operation of the first pump is continued and the operation of the second pump is stopped. Since the first pump operates, heat is stored in the heat storage tank, and the second pump stops, so that heat is not supplied to the air conditioning target. In this way, the air conditioner stores heat in the heat storage tank without changing the set temperature of the air conditioning target when the generated power becomes excessive. Therefore, the comfort of the user is not impaired regardless of the time when the user uses the object to be air-conditioned.

It is a circuit diagram which shows the heat-source system of the air conditioning apparatus 1 which concerns on Embodiment 1 of this invention. It is a hardware block diagram which shows the connection structure of the heat source system and the control part 50 of the air conditioning apparatus 1 which concerns on Embodiment 1 of this invention. It is a functional block diagram which shows the control part 50 which concerns on Embodiment 1 of this invention. 5 is a flowchart showing an operation of the control unit 50 according to the first embodiment of the present invention. 5 is a timing chart showing an operation of the control unit 50 according to the first embodiment of the present invention. 8 is a timing chart showing the operation of the control unit 50 of the comparative example. 7 is a graph showing an intermittent operation of the second pump 41 according to the second embodiment of the present invention.

Embodiment 1.
Hereinafter, embodiments of an air conditioner according to the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a heat source system of an air conditioner 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, the air conditioner 1 includes a heat source device 5, a first heat medium circuit 3, a second heat medium circuit 4, a supply temperature detection unit 10, a return temperature detection unit 11, and The tank temperature detection unit 12 is provided. The heat source unit 5 is, for example, the outdoor unit 20 and the electric heater 26. The outdoor unit 20 is provided with a compressor 21, a flow path switching device 22, an outdoor heat exchanger 23, an expansion section 24, and a cascade heat exchanger 25. Here, as the air conditioner 1, for example, radiant floor heating with hot water can be cited.

The compressor 21, the flow path switching device 22, the outdoor heat exchanger 23, the expansion unit 24, and the cascade heat exchanger 25 are connected by piping to form the refrigerant circuit 2. The compressor 21 sucks in a low-temperature and low-pressure refrigerant, compresses the sucked refrigerant, and discharges it as a high-temperature and high-pressure refrigerant. The flow path switching device 22 switches the direction in which the refrigerant flows in the refrigerant circuit 2, and is, for example, a four-way valve. The outdoor heat exchanger 23 exchanges heat between, for example, outdoor air and a refrigerant, and functions as an evaporator during heating operation and as a condenser during cooling operation. The expansion unit 24 is a pressure reducing valve or an expansion valve that decompresses and expands the refrigerant, and is, for example, an electronic expansion valve whose opening is adjusted. The cascade heat exchanger 25 exchanges heat between the first heat medium flowing through the first heat medium circuit 3 and the refrigerant, and acts as a condenser during heating operation and as an evaporator during cooling operation. To do.

The electric heater 26 heats the first heat medium by the supplied electricity. Although the outdoor unit 20 and the electric heater 26 are used as the heat source device 5 in the first embodiment, either one of them may be used, or another device may be used.

The first heat medium circuit 3 includes a first pump 31, a cascade heat exchanger 25, an electric heater 26, and a heat storage tank 32 connected by piping. The first pump 31 conveys the first heat medium supplied from the heat source device 5 including the outdoor unit 20 and the electric heater 26. The first heat medium carried by the first pump 31 flows through the heat storage tank 32, and the heat of the first heat medium is stored therein. Further, the heat storage tank 32 exchanges heat between the second heat medium flowing through the second heat medium circuit 4 and the first heat medium. The heat of the first heat medium is warm when the outdoor unit 20 is in heating operation, and is cold when the outdoor unit 20 is in cooling operation. The first heat medium is, for example, water or brine.

The second heat medium circuit 4 is formed by connecting the second pump 41, the heat storage tank 32, and the use side heat exchanger 42 by piping. The second pump 41 conveys the second heat medium that has exchanged heat with the first heat medium in the heat storage tank 32. The utilization side heat exchanger 42 is provided in the space of the air conditioning target 9 and exchanges heat between the second heat medium conveyed by the second pump 41 and the utilization side heat medium of the air conditioning target 9. .. When warm heat is stored in the heat storage tank 32, the use side heat exchanger 42 acts as a radiator, and when cold heat is stored in the heat storage tank 32, the use side heat exchanger 42 acts as a cooler. The air-conditioning target 9 is, for example, the interior of a building. The second heat medium is, for example, water or brine.

The supply temperature detection unit 10 is provided in the second heat medium circuit 4, and detects the supply temperature of the second heat medium that flows out from the heat storage tank 32 and flows into the usage-side heat exchanger 42. The return temperature detection unit 11 is provided in the second heat medium circuit 4, and detects the return temperature of the second heat medium that flows out from the usage-side heat exchanger 42 and flows into the heat storage tank 32. The tank temperature detection unit 12 detects the heat storage temperature of the heat storage tank 32. The first embodiment exemplifies a case where the supply temperature detection unit 10, the return temperature detection unit 11, and the tank temperature detection unit 12 are thermistors.

FIG. 2 is a hardware configuration diagram showing a connection configuration between the heat source system and the control unit 50 of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention. The air conditioner 1 includes a remote controller 6 and a controller 50. The remote controller 6 sets, for example, the target supply temperature to the air conditioning target 9 during heating, the target heat storage temperature of the heat storage tank 32, and the like.

The control unit 50 controls the operation of the air conditioning apparatus 1. Here, the surplus power detection unit 7a and the use side temperature detection unit 8a will be described. The surplus power detection unit 7a detects that the generated power supplied from the private power generation device 13 such as a solar power generation device is surplus. Here, the surplus of the generated power means a state in which, for example, the power that exceeds the power required in the house is being generated by the private power generation device 13. The usage-side temperature detection unit 8a detects the target temperature of the air conditioning target 9. The control unit 50 acquires the information on the generated power transmitted from the surplus power detection unit 7a via the first external device 7, and the information on the target temperature transmitted from the usage-side temperature detection unit 8a as the second external device. It is acquired via the device 8.

Here, the first external device 7 has a function of determining whether heat can be stored in the heat storage tank 32 based on the detection result of the surplus power detection unit 7a, and transmits a heat storage command to the control unit 50. .. The second external device 8 is, for example, an indoor temperature detecting thermostat, determines whether to permit or prohibit the air conditioning operation based on the set temperature of the air conditioning target 9 and the target temperature of the air conditioning target 9, and informs the control unit 50 of the air conditioning request information. Command is sent. The control unit 50 selects the temperature detection unit to be controlled based on the air conditioning request information from the second external device 8 and controls the operations of the first pump 31 and the second pump 41. The temperature detection unit to be controlled is the supply temperature detection unit 10 or the tank temperature detection unit 12.

For example, when the set temperature of the air conditioning target 9 is 20 ° C. and the target temperature of the air conditioning target 9 becomes 21 ° C. in the heating operation, the second external device 8 suppresses the further temperature increase, and thus the air conditioning operation is performed. The prohibition command is transmitted to the control unit 50. Moreover, when the target temperature of the air conditioning target 9 reaches 20 ° C. again, the second external device 8 transmits a command to permit the air conditioning operation to the control unit 50. The upper limit temperature threshold and the lower limit temperature threshold, which are the temperature ranges in which the air conditioning operation is permitted, are determined by the second external device 8 or the control unit 50.

FIG. 3 is a functional block diagram showing the control unit 50 according to the first embodiment of the present invention. As shown in FIG. 3, the control unit 50 includes a data collection unit 51, a condition determination unit 52, and a control command unit 53. The data collection means 51 collects data such as the set temperature in the remote controller 6, the detection result of the supply temperature detection unit 10, the detection result of the return temperature detection unit 11 and the detection result of the tank temperature detection unit 12.

The condition determining unit 52 of the air conditioner 1 is based on the data collected by the data collecting unit 51, the information on the generated power acquired from the first external device 7 and the information on the target temperature acquired from the second external device 8. Determine the motion. The operation of the air conditioner 1 is, for example, heat storage in the heat storage tank 32, heat supply to the air conditioning target 9 or stop of heat supply to the air conditioning target 9. The condition determining means 52 determines whether the generated power is surplus by the surplus power detection unit 7a, and also determines whether the target temperature detected by the usage side temperature detection unit 8a is equal to or higher than the upper limit temperature threshold. When the generated power is surplus and the target temperature is equal to or higher than the upper limit temperature threshold, the condition determining means 52 stores heat in the heat storage tank 32 and stops the heat supply to the air conditioning target 9 so as to stop the heat supply. Request to 53.

Further, the condition determining means 52 determines whether the target temperature detected by the use side temperature detecting unit 8a is equal to or lower than the lower limit temperature threshold value during the heating operation. When the target temperature is equal to or lower than the lower limit temperature threshold, the condition determination unit 52 requests the control command unit 53 to stop the heat storage in the heat storage tank 32 and supply the heat to the air conditioning target 9. Further, the condition determination means 52 determines whether the heat storage temperature detected by the tank temperature detection unit 12 is equal to or lower than the heat storage temperature threshold value during the heating operation. When the heat storage temperature is equal to or lower than the heat storage temperature threshold, the condition determination means 52 requests the control command means 53 to store heat in the heat storage tank 32 and supply heat to the air conditioning target 9.

The control command means 53 determines the operation of the heat source device 5 including the outdoor unit 20 and the electric heater 26, the first pump 31 and the second pump 41 based on the determination result of the condition determination means 52, and determines the operation. Instruct each device to perform the specified operation. When the surplus power detection unit 7a detects that the generated power is surplus and the target temperature detected by the usage-side temperature detection unit 8a is equal to or higher than the upper limit temperature threshold, the control command unit 53 operates as follows. It is instructed to continue the operation and stop the operation of the second pump 41. Further, the control command means 53 stops the operation of the first pump 31 and the operation of the second pump 41 when the target temperature detected by the usage-side temperature detection unit 8a is equal to or lower than the lower limit temperature threshold value during the heating operation. Command to start. At that time, the control unit 50 stops the heat source device 5. Further, the control command means 53 starts the operation of the first pump 31 and the operation of the second pump 41 when the heat storage temperature detected by the tank temperature detection unit 12 is equal to or lower than the heat storage temperature threshold value during the heating operation. Command to continue.

(Operation mode, heating operation)
Next, the heating operation of the operation modes of the air conditioner 1 will be described. First, the refrigerant circuit 2 will be described. In the heating operation, the refrigerant sucked into the compressor 21 is compressed by the compressor 21 and discharged in a high temperature and high pressure gas state. The high-temperature, high-pressure gas-state refrigerant discharged from the compressor 21 passes through the flow path switching device 22 and flows into the cascade heat exchanger 25 that functions as a condenser, and in the cascade heat exchanger 25, Is heat-exchanged with the first heat medium flowing in the heat medium circuit 3 to be condensed and liquefied. At this time, the first heat medium is warmed. The condensed liquid state refrigerant flows into the expansion section 24, and is expanded and decompressed in the expansion section 24 to become a low temperature and low pressure gas-liquid two-phase state refrigerant. Then, the refrigerant in the gas-liquid two-phase state flows into the outdoor heat exchanger 23 that functions as an evaporator, and is heat-exchanged with the outdoor air in the outdoor heat exchanger 23 to be evaporated and gasified. The evaporated low-temperature low-pressure gas-state refrigerant passes through the flow path switching device 22 and is sucked into the compressor 21.

Next, the first heat medium circuit 3 will be described. The first heat medium carried by the first pump 31 is heat-exchanged with the refrigerant flowing through the refrigerant circuit 2 by the cascade heat exchanger 25 to be heated. The heated first heat medium is further heated by the electric heater 26 and flows into the heat storage tank 32. As a result, heat is stored in the heat storage tank 32. The first heat medium that has flowed into the heat storage tank 32 is heat-exchanged with the second heat medium that flows into the second heat medium circuit 4, is cooled, and is sucked into the first pump 31.

Next, the second heat medium circuit 4 will be described. The second heat medium transported by the second pump 41 is heat-exchanged with the first heat medium in the heat storage tank 32 to be heated. The heated second heat medium is cooled by heat exchange with the use side heat medium in the use side heat exchanger 42. At this time, the heat medium on the utilization side is heated, and the air conditioning target 9 is heated. The cooled second heat medium is sucked into the second pump 41.

(Operation mode, cooling operation)
Next, the cooling operation will be described. In the cooling operation, the refrigerant sucked into the compressor 21 is compressed by the compressor 21 and discharged in a high temperature and high pressure gas state. The high-temperature, high-pressure gas-state refrigerant discharged from the compressor 21 passes through the flow path switching device 22 and flows into the outdoor heat exchanger 23 that functions as a condenser, and in the outdoor heat exchanger 23, the outdoor air is discharged. Is heat-exchanged with and condensed to liquefy. The condensed liquid state refrigerant flows into the expansion section 24, and is expanded and decompressed in the expansion section 24 to become a low temperature and low pressure gas-liquid two-phase state refrigerant. Then, the refrigerant in the gas-liquid two-phase state flows into the cascade heat exchanger 25 that acts as an evaporator, and is heat-exchanged with the first heat medium flowing in the first heat medium circuit 3 in the cascade heat exchanger 25. Vaporize and gasify. The evaporated low-temperature low-pressure gas-state refrigerant passes through the flow path switching device 22 and is sucked into the compressor 21.

Next, the first heat medium circuit 3 will be described. In the cooling operation, the heater is stopped. The first heat medium carried by the first pump 31 is heat-exchanged with the refrigerant flowing through the refrigerant circuit 2 by the cascade heat exchanger 25 to be cooled, and then flows into the heat storage tank 32. As a result, cold heat is stored in the heat storage tank 32. The first heat medium that has flowed into the heat storage tank 32 is heat-exchanged with the second heat medium that flows into the second heat medium circuit 4, is heated, and is sucked into the first pump 31.

Next, the second heat medium circuit 4 will be described. The second heat medium transported by the second pump 41 is cooled by exchanging heat with the first heat medium in the heat storage tank 32. The cooled second heat medium is heated by heat exchange with the use side heat medium in the use side heat exchanger 42. At this time, the heat medium on the utilization side is cooled, and the air conditioning target 9 is cooled. The heated second heat medium is sucked into the second pump 41.

FIG. 4 is a flowchart showing the operation of the control unit 50 according to the first embodiment of the present invention. Next, the operation of the control unit 50 will be described. As shown in FIG. 4, in the normal heating operation, the control command means 53 operates the first pump 31 and the second pump 41 (step ST1). The condition determination means 52 determines whether the generated power is surplus and the target temperature is equal to or higher than the upper limit temperature threshold (step ST2). If the generated power is surplus and the target temperature is equal to or higher than the upper limit temperature threshold, the control command unit 53 continues the operation of the first pump 31 and stops the operation of the second pump 41 (step ST3). ..

Then, the condition determination means 52 determines whether the target temperature is less than or equal to the lower limit temperature threshold (step ST4). If the target temperature is less than or equal to the lower limit temperature threshold, the control command means 53 causes the operation of the first pump 31. Is stopped and the operation of the second pump 41 is started (step ST5). Then, the condition determination means 52 determines whether the heat storage temperature is equal to or lower than the heat storage temperature threshold (step ST6), and if the heat storage temperature is equal to or lower than the heat storage temperature threshold, the control command means 53 causes the operation of the first pump 31. And the operation of the second pump 41 is continued (step ST7).

FIG. 5 is a timing chart showing the operation of the control unit 50 according to the first embodiment of the present invention. As shown in FIG. 5, in normal heating operation, the target temperature of the air conditioning target 9 is about 19 ° C., the heat storage temperature of the heat storage tank 32 is about 35 ° C., and the supply temperature to the air conditioning target 9 is about 40 ° C. Is. The target temperature is set to maintain a range of 19 ° C to 21 ° C as a comfort region in order to maintain user comfort. That is, the upper limit temperature threshold is 21 ° C and the lower limit temperature threshold is 19 ° C.

From 12:00 to 16:00, private power generation is performed by the private power generator 13, heat is stored in the heat storage tank 32, and heating operation is also performed on the air-conditioning target 9. At that time, continuation of heating of the air-conditioning target 9 is prioritized. Therefore, the target supply temperature to the air conditioning target 9 is raised to the maximum temperature at which the use side heat exchanger 42 can operate. For example, the target supply temperature is raised from 40 ° C to 50 ° C. The temperature may be set as the target heat storage temperature by the remote controller 6 or the like. While the heat storage to the heat storage tank 32 progresses, the heat storage temperature of the heat storage tank 32 rises, and accordingly, the supply temperature to the air conditioning target 9 also rises, and the target temperature of the air conditioning target 9 also rises. Here, even if the heat is stored in the heat storage tank 32, the heat is supplied to the air-conditioning target 9. Therefore, when the heat storage temperature rises to a predetermined temperature, it does not rise any further. Therefore, when the supply temperature to the air-conditioning target 9 also rises to 60 ° C., for example, 60 ° C. is maintained.

If the target temperature becomes 21 ° C. at 16:00, if the target temperature of the air conditioning target 9 further rises, the comfort of the user may be impaired, so heating is prohibited. Specifically, the control unit 50 stops the operation of the second pump 41. Note that as long as the generated power is surplus, the control unit 50 continues the operation of the first pump 31 and the heat storage in the heat storage tank 32 is continued. Here, since heat is not supplied to the air conditioning target 9, the heat storage temperature of the heat storage tank 32 rises. In the first embodiment, the upper limit temperature of the heat storage tank 32 is set to 60 ° C, and if it exceeds 60 ° C, further heat storage is not performed. When the air conditioning operation is permitted, warm heat is supplied to the use side heat exchanger 42, but when the air conditioning operation is prohibited, the heat stored in the heat storage tank 32 is not cooled. Therefore, the target heat storage temperature = heat storage temperature of the heat storage tank 32.

At 21:00, when the target temperature becomes 19 ° C, if the target temperature of the air conditioning target 9 further decreases, the comfort of the user may be impaired, so heating is restarted. Here, since the heat storage tank 32 sufficiently stores heat, the control unit 50 does not operate the first pump 31 while stopping the heat source device 5, but starts the operation of the second pump 41. To do. As a result, the target temperature of the air conditioning target 9 rises due to the heat stored in the heat storage tank 32. When the control unit 50 receives a command for prohibiting the air conditioning operation from the second external device 8 while the second pump 41 is operating, the heat source device 5, the first pump 31, and the second pump 41. Are stopped and the system waits until a command for permitting air conditioning operation is received from the second external device 8.

According to the first embodiment, when the generated power is detected to be excessive and the target temperature is equal to or higher than the upper limit temperature threshold, the operation of the first pump 31 is continued and the operation of the second pump 41 is continued. Stop. Since the first pump 31 operates, heat is stored in the heat storage tank 32, and the second pump 41 stops, so that heat is not supplied to the air conditioning target 9. In this way, the air conditioner 1 stores heat in the heat storage tank 32 without changing the set temperature of the air conditioning target 9 when the generated power becomes excessive. Therefore, the comfort of the user is not impaired regardless of the time when the user uses the air conditioning target 9.

Further, the control unit 50 stops the operation of the first pump 31 and starts the operation of the second pump 41 when the target temperature detected by the use side temperature detection unit 8a is equal to or lower than the lower limit temperature threshold. Since the first pump 31 is stopped, heat is not stored in the heat storage tank 32, and the second pump 41 operates, so that the heat in the heat storage tank 32 is supplied to the air conditioning target 9. In this way, the target temperature of the air conditioning target 9 can be raised only by the heat stored in the heat storage tank 32, which contributes to energy saving.

FIG. 6 is a timing chart showing the operation of the control unit of the comparative example. Here, the operation of the control unit of the comparative example will be described. In the comparative example, when the generated power becomes surplus, the air-conditioned room set temperature, the bathroom hot water set temperature, etc. are changed so that the temperature of the heat medium becomes higher than the temperature at the time of actual use. As a result, when the user actually takes a bath, the temperature of the bathtub falls to an appropriate temperature over time. Here, the temperature at the time of actual use is 40 ° C., and the scheduled bath time is 21:00. As shown in FIG. 6, if the generated power becomes excessive at 12:00, the bathroom hot water supply set temperature is changed from 40 ° C. to 60 ° C. This raises the bathroom to 60 ° C. Although the scheduled bathing time is 21:00, if the bathing time is earlier than planned, the temperature of the bathtub has not dropped and the user feels heat and is uncomfortable.

On the other hand, in the first embodiment, when the generated power becomes excessive, the heat is stored in the heat storage tank 32 without changing the set temperature of the air conditioning target 9. Therefore, the comfort of the user is not impaired regardless of the time when the user uses the air conditioning target 9.

Embodiment 2.
FIG. 7 is a graph showing the intermittent operation of the second pump 41 according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in that the second pump 41 is intermittently operated when the air-conditioning target 9 is heated only by the heat stored in the heat storage tank 32. In the second embodiment, the same parts as those in the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted. Differences from the first embodiment will be mainly described.

As shown in FIG. 7, the control unit 50 intermittently operates the second pump 41 at set time intervals. The ON time and the OFF time of the intermittent operation are set by the remote controller 6. When sufficient heat is stored in the heat storage tank 32 as in the control from 21:00 in FIG. 5 of the first embodiment, the supply temperature to the air-conditioning target 9 is higher than the normal target supply temperature. Become. In the second embodiment, it is possible to prevent the target temperature of the air-conditioning target 9 from rapidly increasing due to the intermittent operation of the second pump 41.

Embodiment 3.
In the second embodiment, the case where the ON time and the OFF time of the intermittent operation of the second pump 41 are set by the remote controller 6 has been described. The third embodiment differs from the second embodiment in that the ON time and the OFF time of the intermittent operation are set based on the temperature of the second heat medium.

First, the remote controller 6 sets the calculation cycle time for intermittent operation. Here, the target value of the supply temperature to the air conditioning target 9 in the normal heating operation using the heat source device 5 is the target supply temperature. Further, the specific heat during normal heating operation is referred to as the specific heat during normal operation, and the flow rate during normal heating operation is referred to as the normal flow rate. The ON time is obtained from the ratio of the heat supply amount calculated from the target temperature of the air conditioning target 9 and the heat supply amount calculated from the heat storage temperature of the heat storage tank 32. That is, the ON time is obtained from the following equation (1) using the specific heat during the main control and the flow rate during the main control. In the formula (1), the heat storage temperature of the heat storage tank 32 is used as the temperature of the second heat medium.

[Equation 1]
ON time = calculation cycle time × [{specific heat at normal time × (target supply temperature−target temperature of air conditioning target 9) × flow rate at normal time} / {specific heat at this control × (heat storage temperature of heat storage tank 32−air conditioning target) Target temperature of 9) × flow rate at the time of this control}] (1)

Then, the OFF time is obtained from the following equation (2).

[Equation 2]
OFF time = calculation cycle time-ON time (2)

If the specific heat at the normal time and the specific heat at the main control are regarded as the same, and the flow rate at the normal time and the flow rate at the main control are regarded as the same, the formula (1) is simplified as the following formula (3). Be converted.

[Equation 3]
ON time = calculation cycle time × {(target supply temperature−target temperature of air conditioning target 9) / (heat storage temperature of heat storage tank 32−target temperature of air conditioning target 9)} (3)

In the third embodiment, the heat storage temperature of the heat storage tank 32 is used as the temperature of the second heat medium, but the supply temperature to the air conditioning target 9 may be used.

According to the third embodiment, the time interval of the intermittent operation of the second pump 41 is set based on the temperature of the second heat medium. The higher the temperature of the second heat medium, the shorter the ON time, and the less heat is supplied to the air conditioning target 9. The lower the temperature of the second heat medium is, the longer the ON time is, and the more heat is supplied to the air conditioning target 9. In this way, since the amount of heat supplied to the air conditioning target 9 is changed based on the temperature of the second heat medium, it is possible to further prevent the target temperature of the air conditioning target 9 from rapidly increasing.

Note that the time interval may be set for each intermittent operation. In this case, the heat storage temperature of the heat storage tank 32 used for the calculation of the ON time and the OFF time is the latest heat storage temperature of the heat storage tank 32 for each calculation cycle time. Here, in the heating operation, when the initial heat storage temperature of the heat storage tank 32 is high, the ON time of the second pump 41 is shorter than the OFF time. When the second pump 41 operates, the second heat medium that has been heat-exchanged and cooled by the use-side heat exchanger 42 flows into the heat storage tank 32, so that the heat storage temperature of the heat storage tank 32 gradually increases. descend. Therefore, the latest heat storage temperature of the heat storage tank 32 is used as the heat storage temperature of the heat storage tank 32 for each calculation cycle time, so that the ON time and the OFF time are reviewed to a time suitable for the heat storage temperature of the heat storage tank 32. You can Therefore, the heat can be appropriately supplied to the air conditioning target 9. In this case as well, the heat storage temperature of the heat storage tank 32 may be the supply temperature to the air conditioning target 9.

1 air conditioner, 2 refrigerant circuit, 3 first heat medium circuit, 4 second heat medium circuit, 5 heat source device, 6 remote controller, 7 first external device, 7a surplus power detector, 8 second external device , 8a user side temperature detection unit, 9 air conditioning target, 10 supply temperature detection unit, 11 return temperature detection unit, 12 tank temperature detection unit, 13 private power generator, 20 outdoor unit, 21 compressor, 22 flow path switching unit, 23 Outdoor heat exchanger, 24 expansion section, 25 cascade heat exchanger, 26 electric heater, 31 first pump, 32 heat storage tank, 41 second pump, 42 usage side heat exchanger, 50 control section, 51 data collection means , 52 condition determination means, 53 control command means.

Claims

A first pump in which a first pump that conveys a first heat medium supplied from a heat source device and a heat storage tank in which the first heat medium that is conveyed by the first pump flows are connected by piping A medium circuit,
A second pump that conveys a second heat medium, the heat storage tank that exchanges heat between the first heat medium and the second heat medium, and the second pump that is conveyed by the second pump. A second heat medium circuit in which a heat medium and a user-side heat exchanger for exchanging heat with the user-side heat medium to be air-conditioned are connected by pipes;
The surplus power detection unit that detects that the generated power supplied from the private power generation device is surplus is detected as the surplus power generation power, and is detected by the usage-side temperature detection unit that detects the target temperature of the air conditioning target. A controlled unit that continues the operation of the first pump and stops the operation of the second pump when the determined target temperature is equal to or higher than the upper limit temperature threshold value;
An air conditioner equipped with.
The control unit is
The operation of the first pump is stopped and the operation of the second pump is started when the target temperature detected by the usage-side temperature detection unit is equal to or lower than a lower limit temperature threshold value. Air conditioner.
The control unit is
The air conditioner according to claim 2, wherein the second pump is intermittently operated at a set time interval.
The time interval is
The air conditioner according to claim 3, wherein the air conditioner is set based on the temperature of the second heat medium.
Further comprising a tank temperature detection unit for detecting the heat storage temperature of the heat storage tank,
The time interval is
The air conditioner according to claim 4, which is obtained from a ratio of a heat supply amount calculated from the target temperature detected by the usage-side temperature detection unit and a heat supply amount calculated from the heat storage temperature detected by the tank temperature detection unit. apparatus.
Further comprising a supply temperature detector for detecting a supply temperature of the second heat medium flowing into the utilization side heat exchanger,
The time interval is
The air conditioner according to claim 4, which is obtained from a ratio of a heat supply amount calculated from the target temperature detected by the usage-side temperature detection unit and a heat supply amount calculated from the supply temperature detected by the supply temperature detection unit. apparatus.
The time interval is
The air conditioner according to any one of claims 4 to 6, which is set for each intermittent operation.