JP2010175179A - Heat storage type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat storage type air conditioner capable of preventing excessive ice making during heating operation using heat storage and of protecting a heat storage tank from the excessive ice making even when an abnormality occurs in water temperature sensors. <P>SOLUTION: The heat storage type air conditioner 1 includes the heat storage tank 15 where a refrigerant circulating coil 16, a float switch 42 and the water temperature sensors 39a, 39b are arranged. During cooling, by using the refrigerant circulating coil 16, ice is made, and by using the cold heat, cooling operation using heat storage is performed. During heating, by using the refrigerant circulating coil 16, warm water is produced, and by using the warm heat, heating operation using heat storage is performed. The water temperature sensors 39a, 39b and the float switch 42 are interposed in a control system for controlling the heating operation using heat storage, and the control system includes a control part 43 finishing the heating operation using heat storage when the detection temperature by the water temperature sensors 39a, 39b becomes set temperature or lower or when the float switch 42 is operated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention uses late-night power to produce ice in a heat storage tank during cooling in the summer, etc., and uses it for daytime cooling, and generates hot water in the heat storage tank during heating in the winter, for example. The present invention relates to a regenerative air conditioner used for heating.

  Conventionally, using midnight power, during cooling in the summer, etc., the water in the heat storage tank is cooled to produce ice, ice is stored as ice, and this cold is used to perform cooling operation using stored heat, during the winter, etc. A heat storage air conditioner that heats water in a heat storage tank during warming, stores the heat as hot water, and uses the heat during the day to perform a heat storage heating operation is widely known. In such a heat storage type air conditioner, a refrigerant circulation coil is provided in the heat storage tank, and ice is made by evaporating the refrigerant in the refrigerant circulation coil during the cooling heat storage operation (ice making operation). During the heating and heat storage operation (during hot water production), hot water is produced by dissipating heat from the refrigerant in the refrigerant circulation coil.

  The heat storage tank is provided with a lower float switch that detects the amount of stored water, an upper float switch that detects the amount of ice making disposed above the water switch, and a water temperature sensor that detects the temperature of the water. . Then, using the upper float switch and the water temperature sensor, during the cooling heat storage operation, when the upper float switch is operated or when the detected temperature of the water temperature sensor becomes lower than a set value (for example, −2 ° C.), ice is detected. It is determined that the ice has been made in a certain amount, and the cooling and heat storage operation is terminated.In the cooling operation using the heat storage, the heating storage operation, and the heating operation using the heat storage, each operation is performed when the detected temperature of the water temperature sensor reaches the set value. It was made to finish (for example, refer patent document 1, 2).

JP 2005-282993 A JP 2008-122016 A

  In the above heat storage type air conditioner, during the cooling heat storage operation, the ice making amount is controlled by using the upper float switch and the water temperature sensor, and the operation is finished. On the other hand, during the heat storage heating operation, the water temperature sensor is detected. When the value dropped to a set value (for example, 4 ° C.), the use of hot water was stopped and the heat storage use heating operation was terminated. However, if an abnormality occurs in the water temperature sensor, if the detected temperature remains high, the hot water will continue to be used no matter what time until the actual water temperature drops to 0 ° C and the hot water changes from water to ice. It will be continued.

  However, even in such a case, there is no particular problem on the refrigerant circuit side that is in the heating operation, and the operation is continued without operating the abnormality detection means and the protection means. For this reason, it reached the situation where ice was made excessively, and as a result, the problem that a thermal storage tank might be damaged by the volume expansion of ice was inherent.

  The present invention has been made in view of such circumstances, and even when an abnormality occurs in the water temperature sensor, it prevents excessive ice-making during the heat-storage-use heating operation, and the heat storage tank can be easily and reliably removed from the excessive ice-making. An object of the present invention is to provide a heat storage type air conditioner that can be protected.

In order to solve the above problems, the heat storage type air conditioner of the present invention employs the following means.
That is, a heat storage type air conditioner according to the present invention includes a refrigerant circulation coil through which refrigerant is circulated, a float switch that detects the amount of ice making, and a heat storage tank in which a water temperature sensor that detects water temperature is disposed. Ice is made in the heat storage tank using the refrigerant circulation coil, the cold storage is used to perform cooling operation using the heat storage, and during heating, hot water is produced in the heat storage tank using the refrigerant circulation coil, In a regenerative air conditioner that performs a regenerative heating operation using the heat, the water temperature sensor and the float switch are interposed in a control system that controls the regenerative heating operation, and the detection of the water temperature sensor When the temperature is equal to or lower than a set temperature, or when the float switch is activated, a control unit is provided that terminates the heat storage use heating operation.

  According to the present invention, when the water temperature sensor and the float switch are interposed in the control system for controlling the heat storage use heating operation, and the detected temperature of the water temperature sensor is equal to or lower than the set temperature or the float switch is activated, the heat storage use heating is performed. Since the controller that terminates the operation is provided, even if the water temperature sensor malfunctions during the heat storage heating operation, and the water temperature cannot be detected and the heat storage heating operation cannot be completed normally, ice making When a predetermined amount of ice is detected by the float switch that detects the amount, the heating operation using the heat storage can be terminated. Accordingly, it is possible to reliably prevent an accident in which the ice temperature is excessively made and the heat storage tank is damaged due to an abnormality occurring in the water temperature sensor during the heat storage use heating operation. Further, such a function can be easily realized by using an existing float switch provided for detecting the amount of ice making when making ice during cooling.

  Furthermore, the regenerative air conditioner of the present invention is the regenerative air conditioner described above, wherein the control unit determines that the water temperature sensor is abnormal when the float switch is activated and the regenerative heating operation is terminated. It is characterized by determining and displaying an abnormality.

  According to the present invention, when the float switch is activated and the heat storage use heating operation is finished, the water temperature sensor is determined to be abnormal and the abnormality display is performed. It can be easily identified that the cause of the abnormal termination is due to the occurrence of an abnormality in the water temperature sensor. Therefore, maintenance can be facilitated.

  Furthermore, the regenerative air conditioner of the present invention is the regenerative air conditioner according to any one of the above, wherein the controller is provided with a plurality of the water temperature sensors, and a temperature difference between the detected temperatures is equal to or higher than a set temperature. The water temperature sensor is determined to be abnormal and is configured to display an abnormality.

  According to the present invention, a plurality of water temperature sensors are provided in the control unit, and when the temperature difference between the detected temperatures is equal to or higher than the set temperature, the water temperature sensor is determined to be abnormal and configured to display an abnormality. The detected temperatures of the water temperature sensors provided individually can be compared, and the presence or absence of abnormality of the water temperature sensor can be determined using the temperature difference. Therefore, the presence or absence of abnormality of the water temperature sensor can be identified early and easily.

  Furthermore, the regenerative air conditioner of the present invention is the regenerative air conditioner according to any one of the above, wherein the control unit is provided with a plurality of the water temperature sensors, and any one of the detected temperatures is below a set temperature. When it reaches, it is comprised so that the said heat storage utilization heating operation may be complete | finished.

  According to the present invention, the controller is provided with a plurality of water temperature sensors, and when the detected temperature of any one of them reaches a set temperature or lower, the heat storage utilization heating operation is configured to end. Even if an abnormality occurs in any of the water temperature sensors, or even if the sensor itself is normal or a detection error has occurred for some reason, backup operation is normally performed using another water temperature sensor, and heat storage is used. The heating operation can be terminated normally. Therefore, the reliability of the product and the stability of control can be improved.

  According to the present invention, even when an abnormality occurs in the water temperature sensor during the heat storage use heating operation and the water temperature cannot be detected and the heat storage use heating operation cannot be terminated normally, the float switch for controlling the ice making amount is used. When a certain amount of ice is made, the heat storage and heating operation can be terminated.Therefore, the water temperature sensor is operated abnormally during the heat storage and heating operation. Accidents leading to damage can be reliably prevented. In addition, such a function can be realized easily and easily by using an existing float switch provided for detecting the amount of ice making when making ice during cooling.

1 is an overall configuration diagram including a refrigerant circuit of a regenerative air conditioner according to a first embodiment of the present invention. It is a control flowchart figure at the time of the heat storage utilization heating operation of the heat storage type air conditioner shown in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The heat storage type air conditioner 1 includes at least one indoor heat exchanger 2 installed in an air-conditioned area, an outdoor heat exchanger 3 installed outdoors, and a liquid pipe 4 through which liquid refrigerant is circulated. A gas pipe 5 through which the gas refrigerant is circulated, a refrigerant compressor 6 that compresses the refrigerant, a four-way switching valve 8 that switches the circulation direction of the refrigerant, an accumulator 10 that adjusts the circulation amount of the refrigerant and performs gas-liquid separation, And a heat storage tank 15 in which a predetermined amount of water is stored.

  The indoor heat exchanger 2 and the outdoor heat exchanger 3 are connected by a liquid pipe 4 and a gas pipe 5. The discharge pipe 7 of the refrigerant compressor 6 is connected to a four-way switching valve 8 interposed in the middle of the gas pipe 5, and the suction pipe 9 of the refrigerant compressor 6 is connected to the four-way switching valve 8 via an accumulator 10. It is connected to the. When the four-way switching valve 8 is off, the refrigerant compressor 6, the outdoor heat exchanger 3, the indoor heat exchanger 2, and the accumulator 10 are sequentially connected. When the four-way switching valve 8 is on, the refrigerant compressor 6, the indoor side heat exchanger 2, the outdoor side heat exchanger 3, and the accumulator 10 are comprised in order.

  In the heat storage tank 15, a refrigerant circulation coil 16 in which refrigerant is circulated is accommodated and disposed in water, and one end of the refrigerant circulation coil 16 is connected to the gas pipe 5 and the outdoor side via a pipe 16a. A pipe branched from the pipe 16a is connected between the heat exchanger 3 and the four-way switching valve 8, and the other end is connected between the outdoor heat exchanger 3 and the four-way switching valve 8 via the pipe 16b. Merged and connected. Further, a pipe 18 that communicates the pipe 16 a and the liquid pipe 4 and a pipe 19 that communicates the pipe 16 b and the liquid pipe 4 are provided. The pipe 19 is branched into a pipe 19a and a pipe 19b on the liquid pipe 4 side. In addition, as shown in the drawings, each of the pipes is provided with solenoid valves SV1 to SV8, expansion valves 21 to 23, throttles 25a to 25h, check valves 32a to 32i, and the like. Such refrigerant circuits are known.

  Also, in the heat storage tank 15, water temperature sensors 39a and 39b for detecting the water temperature, a lower float switch 41 for controlling the amount of water stored in the water, and an upper float switch (float switch) 42 for controlling the ice making amount are installed. ing. The water temperature sensors 39a and 39b are disposed at positions apart from each other in the heat storage tank 15, detect the water temperature at the respective positions, and control units 40 installed outside the heat storage tank 15 with the detection signals. Is configured to input.

  The lower float switch 41 is a switch that detects whether or not a predetermined amount of water is stored in the heat storage tank 15, and outputs an ON signal to the control unit 40 when the water level has reached the predetermined water level. When the water supply is stopped and the water level falls below a predetermined water level, an off signal is output to the control unit 40 to supply the water. Further, the upper float switch (float switch) 42 is a switch for detecting whether or not a certain amount of ice is made in the heat storage tank 15, and when a certain amount of ice is made in the heat storage tank 15, An ON signal is output to the control unit 40.

  The control unit 40 includes a CPU, a ROM, a RAM, and the like (not shown), and various operation control programs and the like are stored in the ROM. Thus, when operating the regenerative air conditioner 1, the CPU expands the operation control program stored in the ROM to the RAM, and controls each part of the regenerative air conditioner 1 based on the execution procedure of the expanded program. Thus, operations such as normal cooling operation, cooling heat storage operation, heat storage use cooling operation, normal heating operation, heating heat storage operation, and heat storage use heating operation can be performed. The outline of these operation modes will be described below.

  In the normal cooling operation, the refrigerant compressed by the refrigerant compressor 6 is converted into the four-way switching valve 8, the outdoor heat exchanger 3, the check valve 32 i, the liquid pipe 4, the expansion valve 21, the indoor heat exchanger 2, and the gas pipe 5. The four-way switching valve 8 and the accumulator 10 are circulated in this order, and the refrigerant condensed and liquefied in the outdoor heat exchanger 3 is evaporated in the indoor heat exchanger 2 to cool the indoor air. .

  In the cooling heat storage operation in which ice is made in the heat storage tank 15 using midnight power, the refrigerant condensed and liquefied in the outdoor heat exchanger 3 is supplied via the pipe 19a, the expansion valve 22, the throttle 25e, and the pipe 16b. It is circulated through the refrigerant circulation coil 16, evaporated by heat exchange with the water in the heat storage tank 15, cooling the water, and making ice. The refrigerant evaporated in the refrigerant circulation coil 16 is circulated to the refrigerant compressor 6 through the pipe 16 a, the gas pipe 5, the four-way switching valve 8, and the accumulator 10, and the amount of ice produced in the heat storage tank 15 is The upper float switch 42 is controlled.

  The regenerative cooling operation using the cold heat of the ice stored in the heat storage tank 15 uses the check valve 32i, the liquid pipe 4, the pipe 19b, the electromagnetic valve SV8, and the pipe 16b for the refrigerant led to the outdoor heat exchanger 3. The refrigerant is then circulated through the refrigerant circulation coil 16, where it is supercooled by the cold heat of ice and then introduced into the indoor heat exchanger 2 via the pipe 18, the electromagnetic valve SV 3, and the expansion valve 21. A so-called peak shift operation is performed by evaporating and cooling the room air. Further, the refrigerant from the refrigerant compressor 6 is circulated directly to the refrigerant circulation coil 16 through the four-way switching valve 8, the electromagnetic valve SV7, the check valve 32f and the pipe 16b, where it is condensed and liquefied by the cold heat of ice, and then the pipe 18 The so-called peak cut operation is performed by introducing the air into the indoor heat exchanger 2 through the electromagnetic valve SV3 and the expansion valve 21 and evaporating the air in the indoor heat exchanger 2 to cool the indoor air. At this time, the refrigerant evaporated in the indoor heat exchanger 2 is circulated to the refrigerant compressor 6 via the gas pipe, the four-way switching valve 8 and the accumulator 10 in any case.

  In normal heating operation, the refrigerant compressed by the refrigerant compressor 6 is converted into the four-way switching valve 8, the gas pipe 5, the indoor heat exchanger 2, the liquid pipe 4, the expansion valve 23, the outdoor heat exchanger 3, and the four-way switching valve 8. The accumulator 10 is circulated in this order, and the indoor air is heated by the heat radiated by the indoor heat exchanger 2.

  Further, in the heating and heat storage operation in which hot water is produced in the heat storage tank 15 using midnight power, the refrigerant compressed by the refrigerant compressor 6 is directly refrigerant through the four-way switching valve 8, the gas pipe 5, the electromagnetic valve SV5, and the pipe 16a. It is made to circulate through the circulation coil 16, and radiates heat to the water in the heat storage tank 15 to heat the water. The refrigerant condensed in the refrigerant circulation coil 16 is the pipe 16b, the pipe 19, the throttle 25f, the check valve 32d, the liquid pipe 4, the expansion valve 23, the throttle 25h, the outdoor heat exchanger 3, the four-way switching valve 8, and the accumulator 10. After that, the refrigerant is circulated to the refrigerant compressor 6.

  Heat storage use heating operation using the temperature of hot water stored in the heat storage tank 15 introduces the refrigerant compressed by the refrigerant compressor 6 into the indoor heat exchanger 2 through the four-way switching valve 8 and the gas pipe 5. Heating is performed by heating indoor air with the heat dissipated here, and further, the refrigerant condensed by radiating heat is supplied to the refrigerant circulation coil 16 via the liquid pipe 4, the pipe 19a, the expansion valve 22, the throttle 25e, and the pipe 16b. It is conducted by absorbing heat from hot water and evaporating. The evaporated refrigerant is circulated to the refrigerant compressor 6 through the pipe 16a, the electromagnetic valve SV6, the check valve 32g, the four-way switching valve 8, and the accumulator 10.

  At the time of this regenerative heating operation, the end of the operation is conventionally configured to end when the temperature of the hot water detected by the water temperature sensor drops to a set temperature, for example, 4 ° C. In the embodiment, the heat storage use heating operation control unit (control unit) 43 provided in the control system that controls the heat storage use heating operation is configured to be terminated as follows according to the control flowchart of FIG.

  In step S1, when the heat storage utilization heating operation is started, the detected values Th1 and Th2 of the two water temperature sensors 39a and 39b are compared with each other in step S2, and whether or not the difference is equal to or less than a set value (for example, 10 deg). Determined. If "YES" is determined, the process proceeds to step S3. If "NO" is determined, it is displayed in step S4 that an abnormality has occurred in the detected values Th1 and Th2 of the water temperature sensors 39a and 39b. Then, the process proceeds to step S3. In step S3, it is determined whether or not the upper float switch (float switch) 42 for controlling the ice making amount is operated.

  When the upper float switch 42 is off (NO), the process proceeds to step S5. When the upper float switch 42 is on (YES), the process proceeds to step S6 to forcibly end the heat storage use heating operation, and the water temperature sensors 39a and 39b are abnormal. The occurrence is displayed in step S4. When the upper float switch 42 is off and the process proceeds to step S5, it is determined whether or not the detection values Th1 and Th2 of the water temperature sensors 39a and 39b are equal to or less than a set value (for example, 4 ° C.). As a result, if “NO”, the process returns to step S1, the heat storage use heating operation is continued, and the same operation is repeated thereafter. On the other hand, in step S5, if any one of the detection values Th1 and Th2 of the water temperature sensors 39a and 39b is equal to or less than the set value, the process proceeds to step S6, and the regenerative heating operation is normally terminated. Yes.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
In the heat storage type air conditioner 1 described above, during the heat storage use heating operation, the heat storage use heating operation control unit 43 has a difference between the detected values Th1 and Th2 of the water temperature sensors 39a and 39b of 10 deg or less, and any of the water temperature sensors 39a and 39b. If both are determined to be normal, one of the detection values Th1 and Th2 of the water temperature sensors 39a and 39b reaches 4 ° C. or lower unless the upper float switch (float switch) 42 for controlling the ice making amount is activated and turned on. Continue heating operation using heat storage. Then, when the temperature of the hot water stored by this operation gradually decreases to 4 ° C. or less, one of the water temperature sensors 39a and 39b detects it, and the heat storage use heating operation is normally terminated. The

  When an abnormality occurs in any of the water temperature sensors 39a and 39b and the temperature difference between the detection values Th1 and Th2 exceeds 10 degrees during the above-described heat storage use heating operation, any of the water temperature sensors 39a and 39b is determined to be abnormal. The abnormality of the water temperature sensors 39a and 39b is displayed on the control unit 40. However, the operation is continued as it is, and when the detection value Th1 or Th2 of the normally operating water temperature sensor 39a or 39b becomes 4 ° C. or less, the heat storage use heating operation is normally terminated.

  On the other hand, if both of the water temperature sensors 39a and 39b become abnormal, it becomes difficult to detect the water temperature as described above and normally terminate the heat storage use heating operation. Therefore, even if the temperature of the hot water in the heat storage tank 15 falls below the set temperature of 4 ° C., the heat storage type air conditioner 1 continues to operate as it is, even if the hot water cuts 0 ° C. and changes from water to ice. I keep driving. As a result, there is a possibility that the ice is excessively made and the heat storage tank 15 is damaged by the volume expansion. However, in this embodiment, since the heat storage utilization heating operation control unit 43 includes the water temperature sensors 39a and 39b and the upper float switch (float switch) 42 for controlling the ice making amount, a certain amount of ice is made. At that time, the upper float switch 42 is turned on, and the heat storage use heating operation can be forcibly terminated.

  Therefore, during the heat storage-based heating operation, an abnormality occurs in the water temperature sensors 39a and 39b, so that the heat storage type air conditioner 1 continues to operate, and an accident in which the ice is excessively made and the heat storage tank 15 is damaged is ensured. Can be prevented. Further, such a function can be easily realized by using an existing upper float switch (float switch) 42 provided for detecting the amount of ice making when making ice during cooling.

  Further, when the upper float switch (float switch) 42 is operated to forcibly end the heat storage use heating operation, the water temperature sensors 39a and 39b are displayed with an abnormality, and the cause of the abnormal termination is the water temperature. It can be easily recognized that the abnormality is caused by the sensors 39a and 39b, thereby facilitating maintenance. In addition, two water temperature sensors 39a and 39b are provided, and when the difference between the detected values is 10 degrees or more, for example, one of the water temperature sensors 39a and 39b is determined to be abnormal, and an abnormal display is performed. The presence or absence of abnormality in the water temperature sensors 39a and 39b can be identified early and easily.

  In addition, two water temperature sensors 39a and 39b are provided, and when one of the detected temperatures reaches a set value or less, the heating operation using the heat storage is terminated. Even if an abnormality occurs in any of 39a and 39b, or even if the sensor itself is normal or a detection error occurs for some reason, backup operation is normally performed using another water temperature sensor 39a or 39b. Thus, the heat storage use heating operation can be normally terminated. Therefore, the reliability of the product and the stability of control can be improved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
This embodiment is different from the first embodiment described above in that the number of water temperature sensors is one. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present embodiment, the water temperature sensor provided in the heat storage utilization heating operation control unit 43 is only one of the water temperature sensors 39a and 39b (for example, the water temperature sensor 39a).

  As described above, even when the water temperature sensor provided in the heat storage utilization heating operation control unit 43 is the heat storage air conditioner 1 in which only the water temperature sensor 39a is provided, when an abnormality occurs in the water temperature sensor 39a. When the ice is made to a certain amount by the upper float switch (float switch) 42 provided in the control unit 43, the heat storage use heating operation can be forcibly terminated. Therefore, also in the present embodiment, as in the first embodiment, the heat storage type air conditioner 1 continues to operate due to an abnormality occurring in the water temperature sensor 39a during the heat storage use heating operation, and the ice is excessively made and the heat storage tank. It is possible to reliably prevent an accident that 15 is damaged. Further, such a function can be easily realized by using an existing upper float switch (float switch) 42 provided for detecting the amount of ice making when making ice during cooling.

  Further, when the upper float switch 42 is activated and the heat storage use heating operation is forcibly ended, the water temperature sensor 39a determines that the water temperature sensor 39a is abnormal and displays the abnormality, whereby the heat storage use heating operation is ended abnormally. It is possible to easily identify that the cause is due to an abnormality in the water temperature sensor 39a, and the maintenance can be facilitated.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, the refrigerant circuit can be variously modified, and any refrigerant circuit having any configuration can be used as long as the refrigerant circulation coil 16 is provided in the heat storage tank 15 to produce ice and hot water. Good. Moreover, the arrangement | positioning position of the water temperature sensors 39a and 39b provided in the thermal storage tank 15 is not restrict | limited in particular.

DESCRIPTION OF SYMBOLS 1 Thermal storage type air conditioner 15 Thermal storage tank 16 Refrigerant circulation coil 39a, 39b Water temperature sensor 40 Control unit 42 Upper float switch (float switch)
43 Heat Storage Heating Operation Control Unit (Control Unit)

Claims (4)

A refrigerant circulation coil through which refrigerant is circulated, a float switch for detecting the amount of ice making, and a heat storage tank in which a water temperature sensor for detecting water temperature is provided are provided, and during cooling, the ice is stored in the heat storage tank using the refrigerant circulation coil. The ice is made, and the cold storage is used to perform the cooling operation using the stored heat. During heating, the refrigerant circulation coil is used to produce hot water in the storage tank, and the stored heat is used to perform the heating operation using the stored heat. In the heat storage air conditioner
When the water temperature sensor and the float switch are interposed in a control system for controlling the heat storage use heating operation, and the detected temperature of the water temperature sensor is equal to or lower than a set temperature, or the float switch is activated, the heat storage use heating is performed. A regenerative air conditioner characterized in that a controller for terminating the operation is provided.   2. The control unit according to claim 1, wherein when the float switch is operated and the heat storage utilization heating operation is terminated, the water temperature sensor determines that the water temperature sensor is abnormal and displays an abnormality. The regenerative air conditioner described.   The control unit is provided with a plurality of water temperature sensors, and when the temperature difference between the detected temperatures is equal to or higher than a set temperature, the water temperature sensor is determined to be abnormal and is configured to display an abnormality. The regenerative air conditioner according to claim 1 or 2. The said control part is provided with two or more of the said water temperature sensors, and when either detected temperature reaches below setting temperature, it is comprised so that the said heat storage utilization heating operation may be complete | finished. Item 4. The regenerative air conditioner according to any one of Items 1 to 3.

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