JPH0363433A - Operation controller of heat accumulation type air conditioner - Google Patents

Abstract

PURPOSE:To avoid abnormal stop of a compressor by reducing evaporating capacity of a whole air conditioner and to extend a continuous operation range by reducing the evaporation capacity of the whole air conditioner when both heat accumulation medium temperature and the atmospheric air temperature are respectively raised to predetermined set values or more. CONSTITUTION:If balance of evaporating capacity and condensing capacity is collapsed due to an increase in cold accumulation capacity owing to the rise of heat accumulation medium temperature in a heat accumulation tank 11 to be detected by heat accumulation medium temperature detecting means Thw at the time of cold storage and room cooling operation of an air conditioner, and a reduction in the capacity of a heat source side heat exchanger 3 owing to a rise of the atmospheric air temperature to be detected by atmospheric air temperature detecting means Tha so that the condensing capacity becomes insufficient with the result that there is a fear of abnormal stop of a compressor 1 due to an excess rise of high pressure, a user side heat exchanger 7 is so controlled as to be forcibly thermally interrupted by operation control means. Accordingly, it is corrected in a direction for recovering the balance of the capacities by reducing the evaporating capacity to prevent the abnormal stop of the compressor 1 due to an excess rise of the high pressure. Therefore, a continuous operation range can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an operation control device for a regenerative air conditioner,
In particular, it relates to measures to expand the range of continuous operation of the compressor during simultaneous cold storage and cooling operations.

(Prior Art) Conventionally, as proposed in, for example, Japanese Unexamined Patent Publication No. 64-10068, a refrigerant circuit has been provided with a compressor, a heat source side heat exchanger, a main pressure reducing mechanism, and a user side heat exchanger connected in sequence. A heat storage tank storing a heat storage medium capable of storing cold through heat exchange with a refrigerant, a heat storage heat exchanger for cooling the heat storage medium by evaporating the refrigerant, and a pressure reduction mechanism for cold storage are disposed in the air conditioner,
By exchanging heat with a refrigerant in a thermal storage heat exchanger to store cold energy when electricity rates are low, such as at night, and by extracting that cold energy during the day and using it for cooling operation, we aim to reduce power consumption. The heat storage type air conditioner that attempts to achieve this is a well-known technology.

(Problem to be Solved by the Invention) By the way, in the conventional regenerative air conditioner described above, when the demand for cooling the indoor side becomes small during daytime cooling operation, the storage heat exchange is performed at the same time while performing the cooling operation. By evaporating the refrigerant in the heat exchanger, in other words, performing simultaneous cold storage and cooling operation, the capacity of the heat exchanger on the heat source side is effectively used to store cold heat, and the cold heat can be used when there is a large demand for cooling. It is possible to further improve the power reduction effect.

On the other hand, since such a heat storage type air conditioner is based on the premise that heat storage is used for air conditioning, the capacity on the indoor side is designed to be larger than the capacity on the outdoor side. During the simultaneous cold storage and cooling operation as described above, the evaporation capacity on the storage heat exchanger side is further added to the evaporation capacity on the indoor side, so that the evaporation capacity has a considerable margin compared to the condensation capacity. Therefore, during simultaneous cold storage and cooling operation, if the evaporation capacity of the thermal storage heat exchanger increases at the same time due to a rise in the temperature of the heat storage medium, and the condensation capacity decreases due to the rise in outside air temperature, the entire system will evaporate. The capacity balance between the capacity and the condensing capacity cannot be maintained, and as a result, there is a risk that the high pressure will rise excessively due to the lack of condensing capacity, causing the compressor to abnormally stop due to high pressure cut.

The present invention has been made in view of the above, and its purpose is to reduce high pressure when there is a risk that the condensing capacity will be insufficient compared to the evaporating capacity during simultaneous cold storage and cooling operation of a regenerative air conditioner. The purpose is to prevent abnormal stoppage of the compressor and expand the range of continuous operation by taking measures to prevent an excessive rise in the compressor.

(Means for Solving the Problem) In order to achieve the above object, the solving means of the present invention reduces the evaporation capacity of the entire device when both the heat storage medium temperature and the outside air temperature rise above a predetermined set value. There is a particular thing.

Specifically, the first solution, as shown in FIG. 1A, includes a compressor (1), a heat source side heat exchanger (3), and a pressure reducing mechanism (6
) and a user-side heat exchanger (7) connected in sequence, and a heat storage tank (11) that stores a heat storage medium that can store cold by heat exchange with the refrigerant in the refrigerant circuit (10). )
This assumes a regenerative air conditioner equipped with

As an operation control device for the air conditioner, a heat storage medium temperature detection means (Thv
) and outside air temperature detection means (T
ha), and during simultaneous cold storage and cooling operation, the heat storage medium temperature detection means (T hv) and the outside air temperature detection means (T ha
), and when the heat storage medium temperature and outdoor air temperature are both higher than predetermined set values, the user-side heat exchanger (
7) is provided with an operation control means (5IA) for controlling the thermostat to forcibly turn off the thermostat.

The second solution is a compressor (1
), a refrigerant circuit (10) formed by sequentially connecting a heat source side heat exchanger (3), a pressure reduction mechanism (6), and a user side heat exchanger (7), and the refrigerant in the refrigerant circuit (10). A heat storage tank (11) having a heat storage medium capable of storing cold by exchange;
1) Thermal storage heat exchange W (
12) and a cold storage pressure reducing valve (14) whose opening degree can be adjusted to reduce the pressure of the refrigerant to the thermal storage heat exchanger (12) during cold storage operation. The operation control device includes a heat storage medium temperature detection means (T hv) that detects the temperature of the heat storage medium, an outside air temperature detection means (T ha) that detects the outdoor air temperature, and a heat storage medium temperature detection means (T ha) that detects the temperature of the heat storage medium, and a In response to the outputs of the medium temperature detection means (Thw) and the outside air temperature detection means (Tha), when the heat storage medium temperature and the outdoor air temperature are both higher than predetermined set values, the cold storage pressure reducing valve (14) is activated. This configuration includes an operation control means (51B) that controls the opening degree to be limited to a predetermined opening degree or less.

The third solution is a compressor (1
), a heat source side heat exchanger (3), a user side pressure reducing valve (6) whose opening degree can be adjusted, and a user side heat exchanger (7) are connected in sequence, and a refrigerant circuit (10), and the refrigerant circuit ( 10) A heat storage tank (1
1), a thermal storage heat exchanger (12) for exchanging heat between the thermal storage medium and the refrigerant in the thermal storage [(11), and an opening degree to reduce the pressure of the refrigerant to the thermal storage heat exchanger (12) during cold storage operation. A heat storage medium temperature detection means (Thv
) and outside air temperature detection means (T
ha), and during simultaneous cold storage and cooling operation, the heat storage medium temperature detection means (T hw) and the outside air temperature detection means (T ha
), the higher the heat storage medium temperature or the outdoor air temperature, the higher the usage-side pressure reducing valve (6) and the cold storage pressure reducing valve (14).
) to reduce the maximum opening of the
51C).

(Function) With the above configuration, in the invention of claim (1), the heat storage medium in the heat storage tank (11) is detected by the heat storage medium temperature detection means (Thv) during the simultaneous cold storage and cooling operation of the air conditioner. The capacity of the evaporation capacity and the condensation capacity increases due to the increase in the cold storage capacity due to the rise in temperature and the decrease in the capacity of the heat source side heat exchanger (3) due to the rise in the outside air temperature detected by the outside air temperature detection means (T ha). If the balance is lost and there is a risk that the compressor (1) will stop abnormally due to insufficient condensing capacity and an excessive rise in high pressure, the operation control means (51A) will cause the user side heat exchanger (
7) is controlled to be in a forced thermo-off state, so
The evaporation capacity is reduced and the capacity balance is corrected to recover, thereby preventing the compressor (1) from abnormally stopping due to an excessive rise in high pressure.

In the invention of claim (2), when cold storage and cooling are operated simultaneously, the temperature of the heat storage medium and the outside air temperature rise, the balance between the evaporation capacity and the condensation capacity is disrupted, and the high pressure rises excessively due to the lack of condensation capacity. If there is a risk that the compressor (1) will stop abnormally, the operation control means (51B) limits the maximum DR degree of the cold storage pressure reducing valve (14) to a predetermined opening degree or less, so that the evaporation capacity is reduced. The capacity balance is corrected in the direction of decreasing and recovering, and abnormal stoppage of the compressor (1) is prevented while maintaining the comfort of the air conditioning provided by the normal thermo-on permitted operation indoors.

In the invention of claim (3), when cold storage and cooling are operated simultaneously, the balance between the evaporation capacity and the condensation capacity is disrupted, and the lack of condensation capacity causes the high pressure to rise excessively, causing the compressor (1) to abnormally stop. If a risk arises, the operation control means (51C) limits the maximum opening degree of the user-side pressure reducing valve (6) and the cold storage pressure reducing valve (14) to a smaller value as the water temperature or outside air temperature increases. As a result, the total evaporation capacity decreases and the equipment This will prevent abnormal stoppage of the compressor (1) while continuing simultaneous cold storage and cooling operations that are adapted to the cold storage utilization plan.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

Fig. 2 shows the overall configuration of the air conditioner according to the first embodiment, and is a so-called multi-type air conditioner in which a plurality of indoor units (A), (B), ... are connected to an outdoor unit (X). It is an air conditioner.

In the above outdoor unit (X), (1) is a compressor, (
2) is a four-way switching valve that switches as shown in the solid line in the figure during cooling operation and as shown in the broken line in the figure during heating operation;
) is an outdoor heat exchanger as a heat source side heat exchanger that functions as a condenser during cooling operation and as an evaporator during heating operation, and (4) is a depressurizer that adjusts the refrigerant flow rate during cooling operation and reduces the pressure of the refrigerant during heating operation. The outdoor electric expansion valve functions as a mechanism, (5) is a receiver for storing condensed liquid refrigerant, and (8) is an accumulator for removing liquid components in the suction refrigerant.

On the other hand, each indoor unit (A), (B), ... has the same configuration, and (6) is an indoor electric expansion valve that functions as a pressure reduction mechanism during cooling operation and adjusts the refrigerant flow rate during heating operation; (7) is an indoor heat exchanger as a user-side heat exchanger that is equipped with an indoor fan (7a) and functions as an evaporator during cooling operation and as a condenser during heating operation.

The above-mentioned devices (1) to (8) are sequentially connected through refrigerant piping (9) so that refrigerant can flow therethrough, and have a heat pump effect that releases heat obtained through heat exchange with outdoor air to indoor air. A main refrigerant circuit (10) is configured.

Further, the apparatus is provided with a heat storage unit (Y) for storing cold and heat through heat exchange with the refrigerant flowing through the main refrigerant circuit (10), or for utilizing the cold and warm heat. In the heat storage unit (Y), (11) is a heat storage tank storing water (W) which is a heat storage medium capable of storing cold heat and warm heat, and (12) is disposed in the heat storage tank (11), and water (W) is stored in the heat storage tank (12).
A regenerative heat exchanger for performing heat exchange between the refrigerant and the refrigerant, the regenerative heat exchanger (12) and the above-mentioned outdoor electric expansion valve (4) of the main refrigerant circuit (10) - the indoor electric expansion valve ( 6) is connected through a first branch pipe (13a) and a second branch pipe (13b) so that refrigerant can flow sequentially from the indoor electric expansion valve (6) side. . The first branch pipe (13a) is provided with a heat storage electric expansion valve (14) as a pressure reduction mechanism for cold storage that reduces the pressure of the refrigerant when storing cold heat in water (W), and the second branch pipe (13b) includes a first on-off valve (15) that opens and closes the second branch pipe (13b).
) is provided.

Further, the first on-off valve (15) of the second branch pipe (13a)
- Intermediate piping between the storage heat exchanger (12) and the main refrigerant circuit (1
0) is connected to the gas line (9b) through a third branch pipe (13c) so that refrigerant can flow therethrough, and the third branch pipe (13c) has a second branch pipe (13c) that opens and closes the branch pipe (13c). An on-off valve (16) is provided.

On the other hand, the above-mentioned first line of the liquid line (9a) of the main refrigerant circuit (10). A flow control valve (17) for variably adjusting the flow rate of the refrigerant is interposed between the two joints with the second branch pipes (13a) and (13b).

That is, each of the above valves (2), (4), (6) (14)
, (15), (16), and (17), or by adjusting the degree of opening, the refrigerant circulation route is switched according to each operation mode.

In addition, the flow rate control valve (17), the first on-off valve (15), and the heat storage electric expansion valve (14) direct the flow of refrigerant during the cold storage recovery cooling operation between the second branch pipe (13b) side and the main refrigerant circuit (10). ) side and the other side.

In addition, the device is equipped with sensors (Thv
) is a water temperature sensor (T
ha) is arranged at the air suction port of the outdoor heat exchanger (3),
An outside air temperature sensor (Th1) is an outside air temperature sensor as an outside air temperature detection means for detecting outside air temperature Ta, and (Th1) is a cooling air temperature sensor disposed on the upstream side of the junction with the second branch pipe (13b) of the liquid line (9a) during cooling operation. The sensor (Tho) is the liquid line (9a
A cooling outlet sensor (Ths) disposed on the downstream side during cooling operation of the junction with the first branch pipe (13a) of ) is disposed in the suction line (9d) and is used to detect the suction pipe temperature. The pipe sensor (Sp) is a pressure sensor that is arranged in the gas line (9d) and detects high pressure Tc during the heating cycle and low pressure (suction pressure) Te during the cooling cycle. A controller (not shown) controls the operation of each device of the air conditioner according to the outputs of the sensors.

Next, to explain the refrigerant circulation path, during normal cooling operation, the four-way switching valve (
2) switches as shown by the solid line in the figure, and the outdoor electric expansion valve (4
), flow control valve (17), indoor electric expansion valve (6),...
・ is opened, all other valves are closed, and the refrigerant condensed in the outdoor heat exchanger (3) is transferred to the main refrigerant circuit (
10), each indoor electric expansion valve (6),...
The pressure is reduced in the indoor heat exchanger (7), . . . , and the air is evaporated and returned to the compressor (1).

On the other hand, during cold storage and cooling operation at the same time, the outdoor electric expansion valve (4) and the flow control valve (17
), indoor electric expansion valve (6), ... thermal storage electric expansion valve (1
4) and the second on-off valve (16) open, and the first on-off valve (15) opens.
) is closed, a part of the liquid refrigerant condensed in the outdoor heat exchanger (3) flows through the main refrigerant circuit (10), and the indoor electric expansion valve (
6),... is depressurized and transferred to the indoor heat exchanger (7),...
While the remaining liquid refrigerant evaporates in the first branch pipe (13a)
It flows to the side, is depressurized by the heat storage electric expansion valve (14), and evaporates in the heat storage heat exchanger (12). Then, these refrigerants in a gaseous state join together in the gas line (9b) and circulate back to the compressor (1).

Here, the claims regarding the simultaneous operation of cold storage and air conditioning (
Regarding the control contents according to the inventions 1) to (3), Figs.
This will be explained based on the control state transition diagram or flowchart of FIG.

In the invention of claim (1), as shown in FIG.
After performing initialization (NON) in state ①, cold storage and cooling operation are performed simultaneously while allowing thermomoon in state ①, and the water temperature T%N of heat storage Wa (11) detected by the water temperature sensor (Thv) is When the outside air temperature Ta detected by the outside temperature sensor (T ha) is higher than the predetermined set value of 25°C and higher than the predetermined set value of 35°C, the capacity of the indoor side and the heat storage side, that is, the evaporation capacity and the indoor It is determined that the balance with the outside capacity, that is, the condensing capacity, is tilted towards a lack of condensing capacity, and each indoor unit (A) shifts to state ■.

... is forcibly controlled to be in a thermo state. In other words, by closing each indoor electric expansion valve (6), ... and operating the indoor fan (7a), ... at the standard air volume, the air conditioning effect in the room can be maintained to some extent. The amount of heat exchanged in the heat exchangers (7), . . . is controlled to be reduced. Then, during the forced thermo-off operation in each of the indoor units (A), . When it becomes lower than ℃, it is determined that the capacity balance has been recovered, and the state returns to state (2), and simultaneous cold storage and cooling operation is performed to permit thermo-on of the indoor units (A), . . . .

According to the control in the above state (2), during the simultaneous cold storage and cooling operation, the water temperature Tv and An operation control means (51A) is configured to forcibly control the user-side heat exchanger (7) to turn off the thermostat when the outside air temperature Ta is equal to or higher than a predetermined set value.

Therefore, in the invention of claim (1), when the air consistency device is operating simultaneously for cold storage and cooling, the water temperature Tv in the heat storage tank (11) is
When the temperature rises, the amount of heat exchanged in the regenerative heat exchanger (12) increases. Moreover, when the outside air temperature Ta increases, the capacity of the outdoor heat exchanger (3) decreases. That is, when both the water temperature Tw and the outside air temperature Ta rise above a certain level, the balance between the evaporation capacity and the condensation capacity is disrupted, and the condensation capacity tends to be insufficient. Therefore, if the operation continues as it is, there is a risk that the high pressure will rise excessively and the compressor (1) will abnormally stop due to high pressure cut.

In that case, in the present invention, both the water temperature Tw and the outside air temperature Ta are set to predetermined values (in the above embodiment, each is 25°C
and 35°C), the operation control means (51A
), each indoor unit (A), ... is controlled to be in a forced thermo-off state.
),... side is reduced and the capacity balance is corrected in the direction of recovery, thus preventing the compressor (1) from constantly stopping due to an excessive rise in high pressure as described above. Therefore, the continuous operation range can be expanded.

Next, the control content of the invention of claim 2 will be explained based on the control state B transition diagram in FIG.
NON), the heat storage electric expansion valve (14) is activated in state ■.
The maximum opening degree E vaax is the rated maximum value of 2000
(pulse) while performing simultaneous cold storage and cooling operation with unlimited cold storage, if the water temperature Tv detected by the water temperature sensor (T hw) is higher than the set value of 25°C, and if the water temperature Tv detected by the outside air temperature sensor (T ha) is The outside air temperature Ta is the set value 3.
When the temperature rises above 5°C, it is determined that the balance between the evaporation capacity and the condensation capacity has collapsed to the point where the condensation capacity is insufficient, and the state shifts to state (3) and cold storage limited operation is performed. That is, the maximum opening degree E va + ax of the heat storage electric expansion valve (14) is set to 1000 (
pulse) (i.e., 50% of the rated maximum).

Then, during operation under the control of this state (■), either the water temperature Tw becomes lower than the recovery value of 22°C, or the outside air temperature Ta decreases to the recovery value of 3.
When the temperature rises above 2°C, it is determined that the capacity balance has been corrected in the direction of recovery, and the system returns to state (2) and performs simultaneous cold storage and cooling operation using unlimited cold storage.

According to the control in the above state (2), when cold storage and air conditioning are operated simultaneously, when the outputs of the water temperature sensor (Thv) and the outside air temperature sensor (Tha) are received, and the water temperature Tw and the outside air temperature Ta are both above a predetermined set value, An operation control means (51B) is configured to limit the maximum opening of the heat storage electric expansion valve (cool storage pressure reducing valve') (14) to a predetermined opening or less.

Therefore, in the invention of claim (21), the heat storage tank (11)
When the water temperature Tw and the outside air temperature Ta rise, the balance between evaporation capacity and condensation capacity is disrupted, and there is a risk that the high pressure will rise excessively due to insufficient condensation capacity and the compressor (1) may stop abnormally. Since the operation control means (51B) limits the maximum opening EVlaX of the thermal storage electric expansion valve (14) to a predetermined opening (50% of the normal opening in the above embodiment), the evaporation capacity decreases and the capacity decreases. The balance is corrected, and cooling operation can continue indoors with the normal thermo-on permission enabled, thereby preventing abnormal stoppage of the compressor (1) while maintaining the comfort of the air-conditioned feeling. By preventing this, it is possible to expand the continuous operation range.

Next, the control contents according to the invention of claim (3) will be explained based on the flowchart of FIG.
1, the water temperature sensor (T hw) and the outside temperature sensor (T h
In step S2, the signals for the water temperature Tv and the outside air temperature Ta are input manually, and in step S2, the maximum opening E vsax is determined from the signals using the following formula (%)).
6), . . . and the heat storage electric expansion valve (14) are calculated. However, Evl is the rated maximum opening value, CI.

C is a constant, T ws and T as are water temperature TV, respectively.
, a predetermined standard value of the outside air temperature Ta, for example, for each indoor electric expansion valve (6), the following formula (1) % formula %) -40x (Ta -32) (1) Thermal storage electric expansion valve (14 ), use the following formula (2) % formula %
) (2) Calculations are performed based on the following.

Then, in steps S3 to S5, the opening degree is calculated for each indoor electric expansion valve (6), . . . Compare Ev with the maximum opening value Evsax, and if the opening value Ev is greater than or equal to the maximum opening value Evsax, set it to the maximum opening value Evaax, and if it is smaller than the maximum opening value Evmax. If the calculated value remains unchanged, the process proceeds to step S6, and each indoor electric expansion valve (6
), . . . and the opening Ev of the heat storage electric expansion valve (14).

In the above flow, in steps 31 to S6, during the simultaneous cold storage and cooling operation, the indoor electric expansion increases as the water temperature Tv or the outside air temperature Ta increases, according to the outputs of the water temperature sensor (Thw) and the outside air temperature sensor (T ha). Valve (6),・
...and the maximum opening degree E va+ of the heat storage electric expansion valve (14)
Operation control means (51C) that controls to reduce ax
is configured.

Therefore, in the invention of claim (3), during the simultaneous operation of cold storage and cooling, the balance between the evaporation capacity and the condensation capacity is disrupted, and the lack of condensation capacity causes the high pressure to rise excessively, causing the compressor (
1) if there is a risk of abnormal stoppage, the operation control means (
51C), the maximum opening value Ev of the opening degree Ev of each indoor electric expansion valve (6), ... and the heat storage electric expansion valve (14) is determined.
iax is smaller as the water temperature Tw is higher, and the outside air temperature Ta is smaller.
Since the higher the value, the smaller the limit is, the cooling capacity and cold storage capacity are reduced according to the ratio determined by various conditions such as required capacity, liquid refrigerant temperature, refrigerant circulation amount, etc., and the evaporation capacity is reduced. The total will decrease, resulting in
This makes it possible to prevent abnormal stoppage of the compressor (1) and expand the range of continuous operation while continuing simultaneous cold storage and cooling operations that are adapted to the cold storage usage plan of the device.

Although the above embodiment describes a multi-type air conditioner in which a plurality of indoor units (A) to (C) are installed, the present invention relates to a so-called pair-type air conditioner in which only - indoor units are installed. Needless to say, it also applies to scales.

(Effect of the invention) As explained above, according to the invention of claim (1), when the heat storage medium temperature and the outside air temperature become higher than the set value when the heat storage type air conditioner is operating the cold storage and cooling simultaneously, ,
By forcing the heat exchanger on the user side to enter the thermo-off state, the imbalance between evaporation capacity and condensation capacity has been corrected, and the lack of condensation capacity causes the high pressure to rise excessively and cause the compressor to stop abnormally. It is possible to prevent this risk from occurring, and it is therefore possible to expand the range of continuous operation.

According to the invention of claim (2), when the heat storage medium temperature and the outside air temperature become higher than the set values during the simultaneous cold storage and cooling operation of the regenerative air conditioner, the opening degree of the cold storage pressure reducing valve is opened to a predetermined value. Since the compressor is limited to less than 100°C, it is possible to avoid abnormal stoppage of the compressor due to insufficient condensing capacity without impairing the feeling of air conditioning in the room, and it is therefore possible to expand the range of continuous operation.

According to the invention of claim (3), when the regenerative air conditioner is operating simultaneously for cold storage and cooling, the opening degree of the usage-side pressure reducing valve and the opening degree of the cold storage pressure reducing valve are increased as the heat storage medium temperature or the outside air temperature increases. This makes it possible to avoid abnormal stoppage of the compressor due to insufficient condensing capacity while continuing simultaneous cold storage and cooling operation according to the plan for using stored cold heat, thereby expanding the range of continuous operation. be able to.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. Tei 2
The following figures show embodiments of the present invention, FIG. 2 is a refrigerant piping system diagram showing the overall configuration of an air conditioner, and FIG.
4 is a control state transition diagram showing the control contents of the invention of claim 2, and Fig. 5 is a control state transition diagram showing the control contents of the invention of claim 2.
The figure is a flowchart showing the control contents of the invention according to claim (3). 1 Compressor 3 Outdoor heat exchanger (heat source side heat exchanger) Indoor electric expansion valve (user side pressure reducing valve) Indoor heat exchanger (user side heat exchanger) 10 Main refrigerant circuit 11 Heat storage tank 12 Thermal storage heat exchanger 14 Heat storage Electric expansion valve (pressure reducing valve for cold storage) 51 Operation control means Thv Water temperature sensor (thermal storage medium temperature detection means) Tha Outside temperature sensor (outside air temperature detection means)

Claims (3)

[Claims] (1) A refrigerant circuit (10) formed by sequentially connecting a compressor (1), a heat source side heat exchanger (3), a pressure reduction mechanism (6), and a user side heat exchanger (7); ) A heat storage tank (1
1), a heat storage medium temperature detection means for detecting the temperature of the heat storage medium (
Thw), an outside air temperature detection means (Tha) that detects the outdoor air temperature, and when cold storage and cooling are operated simultaneously, the heat storage medium temperature detection means (Thw) and the outside air temperature detection means (Tha).
), and when the heat storage medium temperature and outdoor air temperature are both higher than predetermined set values, the user-side heat exchanger (
7) An operation control device for a regenerative air conditioner, comprising an operation control means (51A) for controlling the thermostat to be forcibly turned off. (2) A refrigerant circuit (10) formed by sequentially connecting a compressor (1), a heat source side heat exchanger (3), a pressure reducing mechanism (6), and a user side heat exchanger (7); ) A heat storage tank (11) having a heat storage medium that can store cold through heat exchange with the refrigerant in
, a regenerative heat exchanger (12) for exchanging heat between the refrigerant and the refrigerant medium in the thermal storage tank (11), and an adjustable opening for reducing the pressure of the refrigerant to the refrigerant during cold storage operation. In a regenerative air conditioner equipped with a cold storage pressure reducing valve (14),
Heat storage medium temperature detection means for detecting the temperature of the heat storage medium (
Thw), an outside air temperature detection means (Tha) that detects the outdoor air temperature, and when cold storage and cooling are operated simultaneously, the heat storage medium temperature detection means (Thw) and the outside air temperature detection means (Tha).
), and when the heat storage medium temperature and outdoor air temperature are both above predetermined set values, the cold storage pressure reducing valve (1
4) Operation control means (51B) for controlling the opening degree to be limited to a predetermined opening degree or less. (3) Compressor (1), heat source side heat exchanger (3), user side pressure reducing valve with adjustable opening (6), and user side heat exchanger (7)
a refrigerant circuit (10) formed by sequentially connecting the refrigerant circuit (10);
10) a heat storage tank (11) having a heat storage medium capable of storing cold through heat exchange with a refrigerant therein; and a heat storage heat exchanger (12) that performs heat exchange between the heat storage medium of the heat storage tank (11) and the refrigerant; During cold storage operation, in a regenerative air conditioner equipped with a cold storage pressure reducing valve (14) whose opening degree is adjustable to reduce the pressure of the refrigerant to the thermal storage heat exchanger (12), the temperature of the heat storage medium is detected. A heat storage medium temperature detection means (Thw), an outside air temperature detection means (Tha) that detects the outdoor air temperature, and a Depending on the output, the higher the heat storage medium temperature or outdoor air temperature, the more the above-mentioned user-side pressure reducing valve (6)
and an operation control means (51C) for controlling the maximum opening of the cold storage pressure reducing valve (14) to be small.