JP2006275449A - Heat storage type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat storage type air conditioner having sufficient cold storage capability while quickly coping with the case that the amount of heat storage medium in a heat storage tank is less than a proper amount. <P>SOLUTION: The heat storage type air conditioner capable of cold storage operation comprises a pressure sensor 33 provided on the suction side of a compressor 1 which entraps refrigerant passing through a heat storage heat exchanger 21, for detecting the suction pressure of the compressor, and an operation control means 50 for performing protecting operation of at least either stopping the compressor 1 or issuing an alarm when the pressure sensor 33 detects a preset pressure value which defines the heat storage medium in the heat storage tank to be in an insufficient condition in a preset target cold storage time during cold storage operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a regenerative air conditioner that includes an outdoor unit, a heat storage tank that has a built-in heat storage medium capable of storing cold heat and has a heat exchanger for cold storage heat, and an indoor unit, and that can perform air conditioning.

  The heat storage type air conditioner has an advantage that it can perform peak cut-compatible operation such as during daytime cooling operation by using cold storage heat operation at night (for example, Patent Document 1). In addition, an ice storage operation protection device that detects a temperature corresponding to the evaporation temperature in an ice storage type heat exchanger and stops the compressor when the detected temperature falls below a predetermined temperature is also known. (For example, Patent Document 2).

Patent Registration No. 3284582 (paragraph [0106], FIG. 2) Patent Registration No. 2836411 (paragraph [0014], FIG. 1)

However, conventional heat storage air conditioners do not recognize the heat storage medium (usually water) in the heat storage tank, or if the cold storage heat medium drops below the reference water level, and perform cold storage operation and heat storage operation without noticing them. Repeatedly, for this reason, there was a problem that sufficient capacity as a regenerative air conditioner could not be exhibited.
This invention has been made in response to the above-mentioned problem, and when the heat storage medium in the heat storage tank becomes less than the appropriate amount, it is possible to respond quickly, and the regenerative heat capacity of the regenerative air conditioner is sufficient without waste. The present invention proposes a regenerative air conditioner that can be used in the future.

The heat storage type air conditioner of the present invention stores an outdoor unit having a compressor and a heat source side heat exchanger, an indoor unit having a load side heat exchanger, a heat storage medium, and performs heat exchange between the heat storage medium and the refrigerant. A heat storage type air conditioner having a refrigerant circuit including a heat storage tank having a heat storage heat exchanger and connected to the compressor, the heat source side heat exchanger, the load side heat exchanger, and the heat storage heat exchanger. A pressure detection device that detects the suction pressure of the compressor provided on the suction side of the compressor that takes in the refrigerant that has passed through the heat storage heat exchanger, and the pressure within a preset target cold storage time during the cold storage operation When the detection device detects a preset pressure value that considers the heat storage medium in the heat storage tank to be in a deficient state, the operation control means performs a protective operation of at least one of stopping the compressor or issuing an alarm. With .
Also, an outdoor unit having a compressor and a heat source side heat exchanger, an indoor unit having a load side heat exchanger, and a heat storage unit having a heat storage heat exchanger that stores the heat storage medium and performs heat exchange between the heat storage medium and the refrigerant. A heat storage air conditioner having a refrigerant circuit to which the compressor, the heat source side heat exchanger, the load side heat exchanger, and the heat storage heat exchanger are connected, the temperature of the heat storage medium being A heat storage medium temperature detection device for detecting, a refrigerant condensation temperature detection device for detecting a condensation temperature of the refrigerant that has passed through the heat storage heat exchanger, a temperature by the heat storage medium temperature detection device during the heat storage operation, and the refrigerant condensation temperature detection device Operation that performs at least one of the protective operation of stopping the compressor or issuing an alarm when the difference from the temperature by the temperature becomes a preset value that regards the heat storage medium in the heat storage tank as a shortage state And control means It is intended.

The heat storage type air conditioner of the present invention includes a pressure detection device that detects the suction pressure of the compressor provided on the suction side of the compressor that takes in the refrigerant that has passed through the heat storage heat exchanger, and a preset target cold storage during the cold storage operation. Within a time, when the pressure detection device detects a preset pressure value that considers the heat storage medium in the heat storage tank to be in a shortage state, at least one of the protective operation of stopping the compressor or issuing an alarm is performed. Operation control means. For this reason, it is possible to quickly cope with the shortage of the heat storage medium in the heat storage tank, and it is possible to fully utilize the cooling capacity of the heat storage type air conditioner without wasting it.
Also, a heat storage medium temperature detection device that detects the temperature of the heat storage medium, a refrigerant condensation temperature detection device that detects the condensation temperature of the refrigerant that has passed through the heat storage heat exchanger, and the temperature and refrigerant generated by the heat storage medium temperature detection device during the heat storage operation When the difference from the temperature by the condensing temperature detection device becomes a preset value that considers the heat storage medium in the heat storage tank to be in a shortage state, at least one of the protective operation of stopping the compressor or issuing an alarm is performed. Operation control means to perform. For this reason, it is possible to quickly cope with the shortage of the heat storage medium in the heat storage tank, and it is possible to fully utilize the heating capacity of the heat storage type air conditioner without wasting it.

  Hereinafter, the present invention will be described based on the embodiments. FIG. 1 is a configuration diagram of a regenerative air conditioner according to an embodiment of the present invention. This heat storage type air conditioner constitutes a refrigeration cycle to which an outdoor unit A (outdoor unit), a heat storage tank B (heat storage unit), and indoor units C1 and C2 (indoor units) are connected. The outdoor unit A and the heat storage tank B are connected by a liquid pipe P3, a low pressure gas pipe P2, and a high pressure gas pipe P1, and the heat storage tank B and the indoor units C1 and C2 are a liquid side extension pipe P5 and a gas side extension. It is connected by piping P4. In this example, two indoor units are provided. However, the number is not limited to two.

  Furthermore, the heat storage type air conditioner is provided with operation control means 50 for controlling each operation described later, and is related to operation control among the constituent devices of the outdoor unit A, the heat storage tank B, and the indoor units C1 and C2. Connected to the device. The operation control means 50 can be composed of a program in which an operation control algorithm is described and a CPU (central processing unit) or a microcomputer for operating the program. The operation control means 50 is usually installed in the outdoor unit A, but the installation location is not particularly limited and may be determined as appropriate.

  The outdoor unit A has a compressor 1, a four-way valve 2 as a flow switching device, an outdoor heat exchanger 3 as a heat source side heat exchanger, a supercooling heat exchanger 4, and a third flow control valve 5 connected by piping. Has been configured. Also, piping between the supercooling heat exchanger 4 and the outdoor heat exchanger 3, piping between the supercooling heat exchanger 4 and the third flow control valve 5, supercooling heat exchanger 4 and the compressor 1 The first, second, and third temperature sensors 6, 7, and 8 are respectively provided in the pipes between the two. Furthermore, the discharge side refrigerant circuit and the suction side refrigerant circuit of the compressor 1 are each provided with a high pressure sensor 32 and a low pressure sensor 33 for measuring the pressure in the circuit.

The heat storage tank B has a heat storage heat exchanger 21 that stores a heat storage medium such as water and performs heat exchange between the heat storage medium and the refrigerant. One end of the heat storage heat exchanger 21 is connected to the liquid pipe P <b> 3 via the second flow control valve 23 and the first flow control valve 22. The other end of the heat storage heat exchanger 21 is divided into three, a high pressure gas pipe P1 via a first on-off valve 24, a low pressure gas pipe P2 via a second on-off valve 25, and a first The first check valve 28 and the fourth on-off valve 27 are connected to the liquid extension pipe P5.
A pipe branched from a connection pipe between the second flow control valve 23 and the first flow control valve 22 is connected to a first check valve 28 and a fourth open / close valve via a third open / close valve 26. 27 is connected to the connection pipe.
In addition, the second branch pipe is connected to the middle of the pipe connecting the third on-off valve 26 and the first flow control valve 22, branching off from the connection portion of the liquid side extension pipe P5 with the fourth on-off valve 27. A check valve 29 is provided.
Furthermore, the entrance and exit piping of the heat storage heat exchanger 21 is provided with fourth and fifth temperature sensors 30 and 31 for detecting the temperature of the refrigerant passing through the entrance and exit piping.
In addition to these, the heat storage tank B is also provided with a heat storage medium temperature sensor 34 for measuring the temperature of the stored heat storage medium.

  The indoor unit C1 includes an indoor heat exchanger 40a as a load-side heat exchanger, an indoor flow rate control valve 41a, and sixth and seventh temperature sensors 42a and 43a provided in the inlet / outlet piping of the indoor heat exchanger 40a. . Similarly, the indoor unit C2 includes an indoor heat exchanger 40b as a load-side heat exchanger, an indoor flow rate control valve 41b, and eighth and ninth temperature sensors 42b and 43b provided in the inlet / outlet piping of the indoor heat exchanger 40b. Prepare.

  The compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the supercooling heat exchanger 4 and the third flow control valve 5 constituting the outdoor unit A are connected via a high pressure gas pipe P1 and a gas side extension pipe P4. Connected to one inlet / outlet of the indoor heat exchangers 40a and 40b constituting the indoor units C1 and C2, and further connected to the other inlet / outlet of the indoor heat exchangers 40a and 40b via the liquid pipe P3 and the liquid side extension pipe P5. Has been. And the heat storage heat exchanger 21 is connected between the refrigerant circuit which consists of this outdoor unit A and indoor unit C1, C2.

Next, the operation of the regenerative air conditioner configured as described above will be described. The operation operation of this heat storage type air conditioner includes cooling, cold storage, and utilization cooling operations as cooling-related operations, and heating, heat storage, utilization heating, combined heating, and utilization defrost operations as heating-related operations. Hereinafter, these driving operations will be sequentially described.
Table 1 summarizes the operating state of the control valve during cooling-related operation.

(Cooling operation)
FIG. 2 is a diagram showing a refrigerant flow during the cooling operation of the heat storage type air conditioner of FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 through the four-way valve 2 and is cooled and condensed into liquid. The condensed and liquefied refrigerant flows into the supercooling heat exchanger 4 and is further cooled to become supercooled liquid. The third flow rate control valve 5 controls the flow rate so that the temperature difference detected by the second temperature sensor 7 and the third temperature sensor 8 falls within a predetermined range. The supercooled liquid refrigerant flows from the liquid pipe P3 into the indoor units C1 and C2 through the first flow control valve 22 (fully open), the third on-off valve 26, and the fourth on-off valve 27, and the indoor flow control valve. The pressure is reduced to a low pressure by 41a and 41b. The low-pressure refrigerant exchanges heat with indoor air in the indoor heat exchangers 40a and 40b, evaporates and becomes a gas state, and is sucked into the compressor 1 through the pipes P4 and P1. The indoor flow control valve 41a is based on the temperatures detected by the sixth and seventh temperature sensors 42a and 43a, and the indoor flow control valve 41b is based on the temperatures detected by the eighth and ninth temperature sensors 42b and 43b. The flow rate is controlled so that the heating degree of the refrigerant falls within a predetermined range.
As described above, when the supercooling heat exchanger 4 sufficiently increases the degree of supercooling of the refrigerant coming out of the outdoor unit 1, the connection pipes P3 and P5 connecting the heat storage tank B and the indoor units C1 and C2 are long, Even if there is a height difference between these units and the pressure drops due to pressure loss, the refrigerant can be in a liquid state, and the controllability of the indoor flow control valves 41a and 41b can be ensured.

(Cool storage operation)
Next, the operation of the cold storage operation in which water, which is a heat storage medium stored in the heat storage tank B, is cooled to produce cold water or ice will be described. FIG. 3 is a diagram showing a refrigerant flow during the cold storage operation of the heat storage type air conditioner of FIG. The high-temperature high-pressure gas refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 and the supercooling heat exchanger 4 via the four-way valve 2 and becomes supercooled liquid refrigerant. The third flow rate control valve 5 controls the flow rate so that the temperature difference detected by the second temperature sensor 7 and the third temperature sensor 8 falls within a predetermined range. The supercooled liquid refrigerant flows into the first flow control valve 22 from the liquid pipe P3 and is depressurized to a low pressure. Thereafter, the liquid refrigerant passes through the second flow control valve 23 (fully opened) and flows into the heat storage heat exchanger 21, where it exchanges heat and enters a gas state, passes through the first on-off valve 24 and the second on-off valve 25. And sucked into the compressor 1. The first flow rate control valve 22 controls the flow rate so that the degree of heating is within a predetermined range based on the detected temperatures of the fourth and fifth temperature sensors 30 and 31 provided in the inlet / outlet piping of the heat storage heat exchanger 21.
The third flow rate control valve 5 controls the flow rate so that the temperature difference is within a predetermined range based on the temperature detected by the second temperature sensor 7 and the third temperature sensor 8, but at the outlet of the outdoor heat exchanger 3. The degree of supercooling of the outlet refrigerant of the heat storage heat exchanger 21 obtained based on the values of the first temperature sensor 6 provided and the high-pressure sensor 32 provided on the discharge side of the compressor 1 became a predetermined value or more. In such a case, the control is switched to the supercooling degree control so that the supercooling degree becomes a predetermined value or less.
By controlling in this way, the degree of supercooling of the refrigerant flowing into the heat storage heat exchanger 21 becomes sufficiently large, so the pressure loss of the heat storage heat exchanger 21 is small, and the degree of supercooling of the outdoor heat exchanger 3 is excessive. Therefore, high-efficiency operation is possible because the high pressure can be made appropriate without providing a liquid reservoir.

Here, the control algorithm of the cold storage operation will be described. FIG. 4 is a flowchart showing an algorithm for cold storage operation by the operation control means 50 according to the embodiment of the present invention. The cold storage operation starts upon receiving a cold storage operation command (STEP 1). Next, the air conditioning operation time during the daytime and the load state are obtained from the high and low pressures of the refrigeration cycle and the operation frequency of the compressor, and the target cold storage time t1 is calculated (STEP 2). Next, the suction pressure (low pressure) Ps of the compressor 1 is detected by the low pressure sensor 33 (STEP 3). Next, the time t2 from the start of the cool storage operation is compared with the target cool storage time t1 determined in STEP 2 (STEP 4). In STEP 4, when the cool storage operation time t2 from the start does not reach the target cool storage time t1, the low pressure Ps detected in STEP 3 is compared with a predetermined lower limit Pb of the low pressure, and Ps is equal to or greater than Pb. If the Ps is smaller than Pb, the process proceeds to STEP 6 (STEP 5). However, since the target cool storage time t1 is usually longer than the cool storage operation time t2 from the start, the progress from STEP 4 to STEP 6 is virtually not performed.
The predetermined lower limit Pb of the low pressure is a pressure value corresponding to the lower limit of the appropriate range of the amount of heat storage medium in the heat storage tank B, and when Ps is less than the lower limit Pb, The amount of heat storage medium is regarded as a shortage.
In STEP 6, the cool storage operation time t2 from the start is compared with a predetermined operation time t3, and if the cool storage operation time from the start is shorter than the predetermined operation time, the process proceeds to STEP 7. Then, in STEP 7, the compressor 1 is stopped and the cold storage operation is finished, and an alarm that the water in the heat storage tank B is insufficient is issued to the indoor units C1, C2, a remote controller (not shown), and the like. To do. This notification can be performed by lamp display and / or voice output. In this case, only one of the stop of the compressor 1 and the alarm notification may be processed. Thereby, it becomes possible to quickly cope with the shortage of the heat storage medium in the heat storage tank, and it is possible to fully utilize the cooling capacity of the heat storage type air conditioner without wasting it.
On the other hand, if the cold storage operation time from the start is greater than or equal to the predetermined operation time t3 in STEP 6, the operation of the compressor 1 is stopped and the cold storage operation is terminated.

  By the way, the predetermined time t3 in the above STEP 6 is a test in advance of the time that the cold storage operation should be terminated because the water level in the heat storage tank B has decreased before the target heat storage amount is stored in the heat storage tank B. Etc. and stored in the operation control means 50 or the like. The predetermined time t3 can be obtained in advance as, for example, relational data with the suction pressure (low pressure) Ps. In STEP 6, the time determined in accordance with the suction pressure (low pressure) Ps measured by the low pressure sensor 33 is used. Become. Accordingly, STEP 6 prevents the water in the heat storage tank B from dropping and continues the operation in which a predetermined heat storage amount cannot be stored, contributes to securing the capability, and also serves to prevent malfunction.

  Until the water level of the heat storage medium becomes normal, avoiding air conditioning operation and cold storage operation using the heat storage tank to keep the device operating in an abnormal state and prevent the device from being damaged. Can do. When it is confirmed that the water level of the heat storage medium has returned to the normal position, the normal operation using the heat storage tank may be returned by resetting the abnormality with the reset button. Furthermore, if the abnormality is automatically reset periodically and an abnormality in which the water level of the heat storage medium is lowered is detected again, the air conditioning operation using the heat storage tank may not be performed.

(Use cooling operation)
Here, the operation of the utilization cooling which uses the cold water and the cold heat of ice stored in the heat storage tank B for cooling the outdoor unit outlet refrigerant will be described. FIG. 5 is a diagram showing the refrigerant flow during the cooling use operation of the regenerative air conditioner of FIG.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 through the four-way valve 2 and is cooled and condensed into liquid. The condensed and liquefied refrigerant flows into the supercooling heat exchanger 4, but the third flow rate control valve 5 is fully closed so that it is not cooled and passes through the supercooling heat exchanger 4 and from the liquid pipe P3. It flows into the heat storage tank B, passes through the first flow control valve 22 (fully open) and the second flow control valve 23 (intermediate opening), enters the heat exchanger 21 and is cooled there to a supercooled state. Further, the refrigerant passes through the first check valve 28 and the fourth on-off valve 27, is reduced to a low pressure by the indoor flow control valves 41a and 41b, and exchanges heat with the indoor air by the indoor heat exchangers 40a and 40b. Thus, a gas state is obtained, and the refrigerant is sucked into the compressor 1 from the connection pipes P4 and P1. At this time, the indoor flow control valves 41a and 41 are controlled in the same manner as in the cooling operation. Thus, since the refrigerant is in a supercooled state by the cold heat stored in the heat storage tank B, a highly efficient cooling operation can be performed.

  Next, operations related to heating by the heat storage type air conditioner of FIG. 1, that is, operations of heating, heat storage, use heating, combined heating, and use defrost will be described. Table 2 summarizes the control valve control states of these operations.

(Heating operation)
FIG. 6 is a diagram illustrating the refrigerant flow during the heating operation of the regenerative air conditioner of FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the indoor heat exchangers 40a and 40b from the high-pressure gas pipe P1 through the heat storage unit B and the gas side extension pipe P4, and exchanges heat with indoor air to be condensed and liquefied. Then, the refrigerant liquid is depressurized to a low pressure by the indoor flow control valves 41a and 41b, and flows through the fourth on-off valve 27, the third on-off valve 26, and the second check valve 29 so as to be fully opened. Through the flow rate control valve 22, evaporates in the outdoor heat exchanger 3, becomes a gas normal state, and is sucked into the compressor 1. The indoor flow rate control valves 41a and 41b control the flow rate so that the degree of refrigerant supercooling falls within a predetermined range based on the detection values of the sixth to ninth temperature sensors 42a, 43a, 42b, and 43b. Since the outlet side of the indoor flow control valves 41a and 41b is low pressure, the differential pressure at the inlet and outlet of the control valve is large, and the appropriate flow rate is allowed to flow even when there are large pipe length differences or height differences between multiple indoor units. And no imbalance occurs in the capacity of multiple indoor units.

(Heat storage operation)
Next, a heat storage operation in which water, which is a heat storage medium stored in the heat storage tank B, is heated and stored as warm water will be described. FIG. 7 is a diagram showing the refrigerant flow during the heat storage operation of the heat storage type air conditioner of FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the heat exchanger 21 through the four-way valve 2 and the first on-off valve 24 and exchanges heat with water in the heat storage tank B to be condensed and liquefied. The liquid refrigerant passes through the fully opened second flow rate control valve 23, is reduced in pressure to the low pressure by the first flow rate control valve 22, and flows into the outdoor heat exchanger 3, where it exchanges heat with the outside air to become a gas state. It is sucked into the compressor 1. The first flow control valve 22 detects the degree of supercooling of the refrigerant from the fourth temperature sensor 30 and the high pressure sensor 32 and controls the flow rate so that the degree of supercooling falls within a predetermined range.
In the above case, the flow rate is controlled by the first flow rate control valve 22, but when the flow rate is controlled by the second flow rate control valve 23, the first flow rate control valve 23 is controlled by the opening of the second flow rate control valve 23. Since the inlet 22 refrigerant state changes, the pressure loss at this control valve changes. For this reason, it becomes the operation | movement from which a low voltage | pressure falls abnormally, it forms frost on the outdoor heat exchanger 3, or a refrigerant | coolant circulation amount reduces and it takes a long time to start.
Although the indoor flow control valves 41a and 41b are fully closed, they are opened at regular intervals, and the refrigerant accumulated in the gas side extension pipe P4 and the indoor heat exchangers 40a and 40b is recovered to the outdoor unit A side. May be.

  Here, a control algorithm of the heat storage operation will be described. FIG. 8 is a flowchart showing an algorithm for the heat storage operation by the operation control means 50 according to the embodiment of the present invention. The heat storage operation starts the heat storage operation in response to the heat storage operation command in STEP 1. In STEP2, the time t5 from the start of the heat storage operation is compared with the maximum heat storage time t4. If the time t5 from the start of the heat storage operation is equal to or greater than the maximum heat storage time t4, the process proceeds to STEP5 and the heat storage operation is terminated. The maximum heat storage time t4 is a time required for accumulating the rated heat storage amount determined for each device. If the time t5 from the start of the heat storage operation is less than the maximum heat storage time t4 in STEP2, the process proceeds to STEP3. In STEP3, the water temperature T1 of the heat storage medium is detected. If the water temperature T1 is equal to or higher than the predetermined upper limit value T2, the process proceeds to STEP5 and the heat storage operation is terminated. If the water temperature T1 is lower than the upper limit value T2 in STEP 3, the process proceeds to STEP 4. In STEP 4, a predetermined temperature difference T4 previously determined as a difference between the refrigerant condensing temperature T3 and the heat storage medium water temperature T1 is compared, and the difference between the condensing temperature T3 and the heat storage medium water temperature T1 is a predetermined temperature difference. If smaller than T4, return to STEP2. If the difference between the condensation temperature T3 and the water temperature T1 of the heat storage medium is greater than or equal to the predetermined temperature difference T4 in STEP 4, the process proceeds to STEP 6. In STEP6, the compressor 1 is stopped and the heat storage operation is terminated, and an alarm that the water in the heat storage tank B is insufficient is issued to the indoor units C1, C2, a remote controller (not shown), and the like. The warning can be issued by lamp display and / or voice output. In this case, only one of the stop of the compressor 1 and the alarm notification may be processed. Thereby, it is possible to quickly cope with the shortage of the heat storage medium in the heat storage tank, and it is possible to fully utilize the heating capacity of the heat storage type air conditioner without wasting it.

  By the way, the predetermined temperature difference T4 in STEP 4 means that the water level in the heat storage tank B is lowered, the heat transfer pipe in the heat storage tank B is not submerged, and the heat transfer state of the heat storage tank heat transfer pipe deteriorates and condenses. For the phenomenon in which the difference between the temperature T3 and the water temperature T1 widens, the relationship between the water level and the temperature difference is investigated in advance by a test or the like to determine the temperature difference that causes the water level to drop, and this is set as a predetermined temperature difference T4 to the operation control means 50 or the like. I remembered it. As a result, it is possible to prevent the water in the heat storage tank B from being lowered and to continue the operation in which the predetermined heat storage amount cannot be stored, and to secure the capacity.

  Until the water level of the heat storage medium becomes normal, do not perform air-conditioning operation or heat storage operation using the heat storage tank, and keep the device operating in an abnormal state and prevent the device from being damaged. Can do. When it is confirmed that the water level of the heat storage medium has returned to the normal position, the normal operation using the heat storage tank may be returned by resetting the abnormality with the reset button. Furthermore, if the abnormality is automatically reset periodically and an abnormality in which the water level of the heat storage medium is lowered is detected again, the air conditioning operation using the heat storage tank may not be performed.

(Use heating operation)
Next, hot water stored in the heat storage tank B and utilization heating operation for absorbing heat from the water will be described. FIG. 9 is a diagram showing a refrigerant flow during utilization heating of the heat storage type air conditioner of FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the indoor heat exchangers 40a and 40b from the four-way valve 2 and the high-pressure gas pipe P1 through the heat storage unit B and the gas side extension pipe P4, and exchanges heat with room air there. To condense. Then, the refrigerant liquid is decompressed to a low pressure by the indoor flow control valves 41a and 41b, passes through the fourth on-off valve 27, the third on-off valve 26, and the second check valve 29, and further, the second on-open state second valve. The heat storage heat exchanger 21 absorbs heat from the hot water of the heat storage medium, evaporates and enters a gas state, and returns to the compressor 1 from the second on-off valve 25 and the low-pressure gas pipe P2. The indoor flow control valves 41a and 41b are controlled in the same manner as in the heating operation.

(Combined heating operation)
The combined heating operation is a heating operation in which heat is absorbed from both the water in the heat storage tank B and the outside air when the hot water temperature of the heat storage medium is lowered and the intake saturation temperature is lower than the outside air temperature in the above-described heating. . FIG. 10 is a diagram showing a refrigerant flow during combined heating of the heat storage type air conditioner of FIG. The refrigerant discharged from the compressor 1 flows into the indoor heat exchangers 40a and 40b from the four-way valve 2 and the high-pressure gas pipe P1 through the heat storage unit B and the gas-side extension pipe P4, and is reduced in pressure by the indoor flow control valves 41a and 41b. And the refrigerant passes through the fourth on-off valve 27, the third on-off valve 26, and the second check valve 29, and a part of the refrigerant flows into the heat storage heat exchanger 21 from the second flow control valve 23. Therefore, heat is exchanged to form a gas state, and the gas is sucked into the compressor 1 from the second on-off valve 25 through the low-pressure gas pipe P2. On the other hand, the remaining refrigerant passes through the first flow control valve 22, exchanges heat with the outside air in the outdoor heat exchanger 3, enters a gas state, merges with the refrigerant from the low-pressure gas pipe P 2, and is sucked into the compressor 1. The In this case, the second flow rate control valve 23 remains in a fully opened state, and the first flow rate control valve 22 is in a state opened by a predetermined opening.

(Use defrost operation)
Finally, the utilization defrost operation which absorbs heat from the heat storage tank B and melts frost attached to the outdoor heat exchanger 3 will be described. FIG. 11 is a diagram showing the flow of the refrigerant during the use defrost operation of the heat storage type air conditioner of FIG. A high-temperature high-pressure gas refrigerant flows from the compressor 1 through the four-way valve 2 into the outdoor heat exchanger 3 to heat and defrost the frost. The refrigerant that has exchanged heat with frost and condensed passes through the first flow control valve 22 and the second flow control valve 23, flows into the heat storage heat exchanger 21, exchanges heat, and enters a gas state from the second opening / closing valve 25. It is sucked into the compressor 1 through the low-pressure gas pipe P2.
The on / off condition of the defrost operation is performed by, for example, the temperature of the first temperature sensor 6 provided in the connection pipe of the outdoor heat exchanger 3 and a timer (not shown), and the defrost on condition is the first temperature sensor 6. , When the temperature falls below a predetermined temperature and the time is counted by a timer and exceeds the predetermined time. The defrost cut condition is when the temperature of the first temperature sensor 6 is equal to or higher than a predetermined temperature. During this operation, the second flow control valve 23 is fixed at a predetermined opening.

  By the way, each temperature sensor and each pressure sensor which were demonstrated in the said embodiment may substitute with other temperature detection apparatuses and pressure detection apparatuses, such as a thermometer and a pressure gauge. Further, the four-way valve 2 provided in the outdoor unit A may be replaced with another valve or a switching device that performs the same function. Furthermore, in the said embodiment, although the operation control means 50 was set as the aspect which performs both cold storage operation control and heat storage operation control, you may make it perform only one control of these as needed.

The block diagram of the thermal storage type air conditioner which concerns on embodiment of this invention. The figure which shows the flow of the refrigerant | coolant at the time of the air_conditionaing | cooling operation of the thermal storage air conditioner of FIG. The figure which shows the flow of the refrigerant | coolant at the time of the cool storage operation of the thermal storage type air conditioner of FIG. The flowchart which shows the algorithm of the cool storage driving | operation which concerns on embodiment of this invention. The figure which shows the flow of the refrigerant | coolant at the time of utilization air_conditionaing | cooling operation of the thermal storage air conditioner of FIG. The figure which shows the flow of the refrigerant | coolant at the time of the heating operation of the thermal storage air conditioner of FIG. The figure which shows the flow of the refrigerant | coolant at the time of the thermal storage driving | operation of the thermal storage type air conditioner of FIG. The flowchart which shows the algorithm of the thermal storage driving | operation which concerns on embodiment of this invention. The figure which shows the flow of the refrigerant | coolant at the time of utilization heating of the thermal storage type air conditioner of FIG. The figure which shows the flow of the refrigerant | coolant at the time of combined heating of the thermal storage air conditioner of FIG. The figure which shows the flow of the refrigerant | coolant at the time of utilization defrost driving | operation of the thermal storage type air conditioner of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor, 2 Four way valve, 3 Outdoor heat exchanger, 4 Supercooling heat exchanger, 5 3rd flow control valve, 6-8 1st-3rd temperature sensor, 21 Heat storage heat exchanger, 24-27 , 1st to 4th on-off valve, 28, 29 1st, 2nd check valve, 30, 31 4th, 5th temperature sensor, 32 high pressure sensor, 33 low pressure sensor, 34 heat storage medium temperature sensor, 40a , 40b Indoor heat exchanger, 41a, 41b Indoor flow control valve, 42a, 43a 6th, 7th temperature sensor, 42b, 43b 8th, 9th temperature sensor, 50 operation control means, A outdoor unit, B heat storage Tank, C1, C2 indoor unit.

Claims (5)

An outdoor unit having a compressor and a heat source side heat exchanger, an indoor unit having a load side heat exchanger, a heat storage tank having a heat storage heat exchanger for storing the heat storage medium and performing heat exchange between the heat storage medium and the refrigerant, and A heat storage type air conditioner having a refrigerant circuit to which the compressor, the heat source side heat exchanger, the load side heat exchanger and the heat storage heat exchanger are connected,
A pressure detection device that detects the suction pressure of the compressor provided on the suction side of the compressor that takes in the refrigerant that has passed through the heat storage heat exchanger;
During the cold storage operation, if the pressure detection device detects a preset pressure value that considers the heat storage medium in the heat storage tank to be in a shortage state within a preset target cold storage time, the compressor is stopped or alarmed A heat storage type air conditioner comprising: an operation control means for performing at least one of the protective operation of generating   The operation control means compares the cool storage operation time from the start with a predetermined time, and executes the protection operation when the cool storage operation time from the start is shorter than the predetermined time. The regenerative air conditioner according to claim 1.   The operation control means disables the operation using the heat storage heat exchanger until the pressure detection device detects a pressure value that regards the heat storage medium in the heat storage tank as a normal amount. The regenerative air conditioner according to claim 1 or 2. An outdoor unit having a compressor and a heat source side heat exchanger, an indoor unit having a load side heat exchanger, a heat storage tank having a heat storage heat exchanger for storing the heat storage medium and performing heat exchange between the heat storage medium and the refrigerant, and A heat storage type air conditioner having a refrigerant circuit to which the compressor, the heat source side heat exchanger, the load side heat exchanger and the heat storage heat exchanger are connected,
A heat storage medium temperature detection device for detecting the temperature of the heat storage medium;
A refrigerant condensing temperature detecting device for detecting a condensing temperature of the refrigerant that has passed through the heat storage heat exchanger;
During the heat storage operation, when the difference between the temperature by the heat storage medium temperature detection device and the temperature by the refrigerant condensing temperature detection device becomes a preset value that regards the heat storage medium in the heat storage tank as an insufficient state, the compressor A regenerative air conditioner comprising: an operation control means for performing at least one protection operation of stopping the operation or issuing an alarm. The operation control means makes the operation using the heat storage heat exchanger impossible until the temperature difference becomes a temperature difference which considers the heat storage medium in the heat storage tank as a normal amount. The regenerative air conditioner according to claim 4.

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