JPH09113000A - Thermal storage air conditioner system and controlling method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent energy conservation to reduce the operation cost by decreasing the heat loss of a tube connected to an air-cooled brine heat pump unit. SOLUTION: The method for controlling thermal storage air conditioner system comprises the steps of predicting the air conditioning load of next day by an air conditioning load predicting unit 32, detecting the necessary thermal storage amount A of a thermal storage tank necessary to process the cooling load when the predicted load mixes cooling and heating loads, further detecting the residual thermal storage amount B of the tank 21, and inhibiting the thermal storage operation (cooling operation) of an air-cooled brine heat pump unit 23 in a night power time zone if the amount B is more than the amount A. Thus, the operation of the unit 23 is limited only to the heating of the daytime, and the heat loss of the tube connected to the unit 23 is largely reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage air conditioning system apparatus and a control method thereof for storing heat in a heat storage tank by using inexpensive nighttime electric power and utilizing heat radiated from the heat storage tank for daytime air conditioning.

[0002]

2. Description of the Related Art A heat storage tank and a heat source unit for storing heat in the heat storage tank and processing an air-conditioning load are provided. The heat source unit is operated with inexpensive nighttime electric power to store heat in the heat storage tank. There is a thermal storage air-conditioning system device that uses heat radiation from a thermal storage tank for air conditioning in daytime.

According to this apparatus, for example, cold heat can be stored in the heat storage tank and the stored cold heat can be used as an auxiliary capacity for the cooling operation during the daytime. For example, the amount of electric power used in the normal operation during the daytime can be suppressed to a low level by covering the peak portion of the cooling load in the midsummer with the stored cold heat. As a result, it becomes possible to set a low contract power with the power company.

The contracted electric power is the upper limit of the electric power consumption contracted with the electric power company, and is set to a certain level throughout the year. The lower this setting level, the lower the price paid to the power company.

It is also possible to store warm heat in the heat storage tank and use the stored heat as an auxiliary capacity for the heating operation during the daytime. By the way, as a usage pattern of such a heat storage air conditioning system device, there is simultaneous air conditioning of a plurality of rooms. That is,
The air conditioning load of one room can be processed by heat storage while the air conditioning load of another room can be processed by the normal operation of the heat source device.

For example, there is a cooling load throughout the year in a room in which a heat generating device such as a computer is installed, and the cooling load is generated in the winter or the middle period (spring, autumn) while being processed by the stored heat. The heating load of other rooms can be processed by the heating operation of the heat source unit.

[0007]

When the cooling load and the heating load are mixed, the heat source machine performs a heat storage operation (cooling operation) for storing the cold heat in the heat storage tank at night, and processes the heating load at noon. Perform heating operation for. That is,
Mode change from cooling to heating occurs from night to day,
Mode switching from heating to cooling occurs from day to night.

Each time the mode is changed twice a day,
Heat loss occurs in the piping connected to the heat source machine. This heat loss leads to an increase in operating costs. The present invention takes the above circumstances into consideration, and an object of the heat storage air conditioning system device of the first invention is to reduce heat loss, reduce operating costs, and be excellent in energy saving. A control method for a heat storage air conditioning system device according to a second aspect of the present invention aims to reduce heat loss, reduce operating costs, and obtain an energy saving effect.

[0009]

A heat storage air conditioning system device according to a first aspect of the present invention operates a heat source device during nighttime power hours to store cold heat or warm heat in a heat storage tank, and releases heat from the heat storage tank and the heat source device. A means for processing an air conditioning load by cooling or heating operation, and means for predicting the air conditioning load for the next day, and when the predicted air conditioning load includes a cooling load and a heating load, the cooling load or the heating load is processed. Means for detecting the necessary heat storage amount of the required heat storage tank, means for detecting the remaining heat storage amount of the heat storage tank, and when the remaining heat storage amount is larger than the required heat storage amount detected, the above in the nighttime power time zone Means for prohibiting the heat storage operation of the heat source machine.

That is, when the air-conditioning load for the next day is predicted and the predicted air-conditioning load includes both cooling load and heating load,
The required heat storage amount of the heat storage tank required for processing the cooling load or the heating load is detected. Then, when the remaining heat storage amount of the heat storage tank is detected and the remaining heat storage amount is larger than the detected required heat storage amount, the heat storage operation of the heat source device during the nighttime power time period is prohibited.

According to a second aspect of the present invention, there is provided a heat storage air conditioning system control method, wherein a heat source device is operated in a nighttime electric power time zone to store cold or hot heat in the heat storage tank, and the heat is dissipated from the heat storage tank and the heat source machine is cooled or heated. In a heat storage air conditioning system device that processes an air conditioning load by operation, a step of predicting the air conditioning load of the next day, and when a cooling load and a heating load are mixed in this predicted air conditioning load, it is necessary to process the cooling load or the heating load. When the required heat storage amount of the heat storage tank is detected, the remaining heat storage amount of the heat storage tank is detected, and the remaining heat storage amount is larger than the detected required heat storage amount, the heat source device in the nighttime power time zone And a step of prohibiting the heat storage operation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a cold water header, 2 is a cold water header, 3 is a hot water header, and 4 is a hot water header, each of which is connected to a load-side device (not shown) by piping.

A two-way valve 41, between the headers 1 and 2 for cold water,
The heat pump device 6 is connected to the piping via the pump 42 and the pump 5. The heat pump device 6 is also connected between the headers 3 and 4 for hot water via the two-way valves 43 and 44 and the pump 5 described above. The heat pump device 6 is
It is a heat source machine for processing the air conditioning load (cooling load and heating load), equipped with a heat pump type refrigeration cycle,
The water circulated by the operation of the pump 5 is cooled during cooling,
Heat when heating.

A two-way valve 51, between the headers 1 and 2 for cold water,
The load-side coil 11b of the heat exchanger 11 is pipe-connected via 52 and the pump 7. The load side coil 12b of the heat exchanger 12 is connected between the headers 1 and 2 for cold water via the two-way valves 61 and 62 and the pump 8. A load side coil 12b is also connected between the hot water headers 3 and 4 via the two-way valves 63 and 64 and the pump 8.

A heat storage tank 21 stores either cold heat for cooling or hot heat for heating. An ice heat storage method is used for cold heat and a hot water heat storage method is used for hot heat.

An air-cooled brine heat pump device 23 is pipe-connected to the heat storage tank 21 via two-way valves 71 and 72 and a pump 22. Air-cooled brine heat pump device 23
Is a heat source device that is installed, for example, on the roof of a building to store heat in the heat storage tank 21 (cooled heat and stored heat) and process an air conditioning load (cooling load and heating load). Equipped with a pump 2
The brine circulated by the operation of 2 is cooled during cooling,
Heat when heating. Of these, the cooled brine obtained by the cooling action circulates through the heat storage tank 21 to form ice in the heat storage tank 21 and store cold heat.

The heat source side coil 11a of the heat exchanger 11 is connected to the heat storage tank 21 through the two-way valves 73 and 74 and the pump 24. Further, the heat source side coil 1 of the heat exchanger 12 is placed in parallel with the pump 22 and the air-cooled brine heat pump device 23 via the two-way valves 75 and 76.
2a is connected by piping.

On the other hand, reference numeral 30 is a controller that controls the entire apparatus. This controller 30
The heat pump device 6, the air-cooled brine heat pump device 23, and the pumps 5, 7, 8, 22, 24 are connected to the.

The two-way valves 41, 42, 43, 44, 5
1,52,61,62,63,64,71,72,7
3, 74, 75, and 76 are all electromagnetic type, and these two-way valves are also connected to the controller 30.

The controller 30, as shown in FIG.
The main control unit 31 is mainly used. In the main control unit 31,
The air conditioning load prediction unit 32, the remaining heat amount detection unit 33, the clock unit 34, and the memory 35 are connected.

The air conditioning load predicting unit 32 predicts the air conditioning load for the next day, for example, based on statistical weather data, current weather data, weather forecast data for the next day, and the like. With regard to weather data and weather forecast data, it is becoming easier to obtain reliable data, such as the emergence of a specialized organization that creates highly reliable data and appropriately supplies it through a communication line or the like. Accordingly, the air conditioning load can be predicted with high accuracy.

The remaining heat amount detecting section 33 is, for example, the temperature in the heat storage tank 21 and the heat storage tank 2 which is predetermined.
Based on the heat radiation characteristics of No. 1 and the like, the amount of heat storage remaining in the heat storage tank 21 is detected as the remaining heat storage amount B.

The clock unit 34 functions as a clock.
The memory 35 stores nighttime power time zone data for knowing the nighttime power time zone (for example, from 10:00 pm to 8:00 the next morning).

The main controller 31 has the following [1] to [4] as main functional means. [1] Nighttime power hours (for example, night 1 that is predetermined for heat storage operation by the air-cooled brine heat pump device 23)
It is executed from 0:00 to 8:00 the next morning), and during the time period other than the nighttime power time period, cooling or heating operation of the heat pump device 6 or cooling of the air-cooling brine heat pump device 23 is performed according to the predicted air conditioning load of the air conditioning load prediction unit 32. Alternatively, heat source control means for controlling heating operation, operation of each pump, and opening / closing of each two-way valve.

[2] Means for determining whether or not the cooling load and the heating load are mixed in the predicted air conditioning load of the air conditioning load prediction unit 32 at a predetermined time before entering the nighttime power time zone. [3] Means for detecting the required heat storage amount A of the heat storage tank 21 necessary for processing the cooling load or the heating load when it is determined that the cooling load and the heating load are mixed.

[4] A means for prohibiting the heat storage operation of the air-cooled brine heat pump device 23 during the nighttime power time period when the remaining heat storage amount B detected by the remaining heat storage amount detecting section 33 is larger than the required heat storage amount A.

Next, the operation of the above configuration will be described with reference to the flowchart of FIG. (1) First, a case where cold heat is stored in the heat storage tank 21 will be described as an example. At the predetermined time before entering the night power hours,
It is determined whether the cooling load and the heating load are mixed in the air conditioning load of the next day predicted by the air conditioning load predicting unit 32.

For example, in a room in which a heat-generating device such as a computer is installed, a cooling load is generated throughout the year. However, in winter or in the middle period (spring / autumn), a heating load is generated separately from the cooling load. become.

When it is determined that the cooling load and the heating load are mixed, the necessary heat storage (cold heat) amount A of the heat storage tank 21 necessary for the processing of the cooling load is detected, and the remaining heat storage (cold heat) amount of the heat storage tank 21 is detected. B is detected. Then, the required heat storage amount A and the remaining heat storage amount B are compared.

If the remaining heat storage amount B is equal to or smaller than the required heat storage amount A (A ≧ B), the flag f for designating the permission or prohibition of the heat storage operation is set to "1". f = 1 means allowance, f = 0 means prohibition.

The start time of the night power hours (10 pm)
Then, the contents of the flag f are confirmed. When f = 1, the two-way valves 71 and 72 are opened and the heat storage operation (cooling operation) of the air-cooled brine heat pump device 23 and the operation of the pump 22 are started. As a result, ice is formed in the heat storage tank 21, and cold heat is stored in the heat storage tank 21. Two-way valve 71, 72
The remaining two-way valves except for are all closed.

That is, when it is judged that the remaining heat storage amount B at present is insufficient, the heat storage operation (cooling operation) of the air-cooled brine heat pump device 23 during the nighttime power period is allowed, and the heat storage of the air-cooled brine heat pump device 23 is allowed. Driving is maximized from the beginning to the end of the night power hours. As a result, as much cold heat as possible (amount capable of processing a cooling load for several days) is stored in the heat storage tank 21.

At the end of the nighttime power time zone (8:00 am), the heat storage operation of the air-cooled brine heat pump device 23 and the operation of the pump 22 are stopped, and the two-way valve 71,
72 is closed.

After that (after 8:00 am), according to the predicted air conditioning load (cooling load and heating load) of the air conditioning load predicting unit 32 obtained the day before, the stored heat from the heat storage tank 21 is released, the heating operation of the heat pump device 6 is performed, The heating operation of the air-cooling brine heat pump device 23 and the operation of each pump are selectively executed, and the opening / closing of each two-way valve is controlled.

First, for the cooling load, the two-way valve 51,
52, 73, 74 are opened and the pumps 7, 24 are operated. When the pump 24 is operated, brine circulates between the heat storage tank 21 and the heat source side coil 11a of the heat exchanger 11,
The cold storage heat of the heat storage tank 21 is transferred to the brine (ice is gradually melted due to heat dissipation). Further, by operating the pump 7, water circulates between the load side coil 11b of the heat exchanger 11 and the load side. This circulating water receives the cold heat of the brine, that is, the heat radiation from the heat storage tank 21, via the heat exchanger 11, and is cooled. In this way, the cold storage heat is supplied to the load side, and the cooling load is processed.

For the heating load, the two-way valves 43 and 44 are opened to start the heating operation of the heat pump device 6 and the operation of the pump 5. In this case, the water is heated by the heat pump device 6 to become hot water, and the hot water flows to the load side by the operation of the pump 5, and the heating load is processed.

In the situation where all the heating loads cannot be processed only by the heating operation of the heat pump device 6, the two-way valve 6
3, 64, 75 and 76 are opened and the heating operation of the air-cooled brine heat pump device 23 and the operation of the pumps 8 and 22 are started.

In this case, the brine is heated by the air-cooled brine heat pump device 23, and the brine is circulated through the heat source side coil 12a of the heat exchanger 12 by the operation of the pump 22. Further, by operating the pump 8, water circulates between the load side coil 12b of the heat exchanger 12 and the load side. This circulating water receives the heat of brine through the heat exchanger 12 and is warmed. Thereby, heat is supplied to the load side.

Therefore, it is possible to process the heating load of another room at the same time while processing the cooling load of the room in which equipment such as a computer that generates heat is installed, such as in the winter season or the middle period (spring / fall).

However, when the required heat storage amount A and the remaining heat storage amount B are compared and the remaining heat storage amount B is larger than the required heat storage amount A (A <B), the flag f is set to "0". f = 0
In this case, the heat storage operation (cooling operation) of the air-cooled brine heat pump device 23 is prohibited during the nighttime power hours. This is for the following reason.

When the cooling load and the heating load are mixed, the air-cooling brine heat pump device 23 performs the heat storage operation (cooling operation) at night and the heating operation as needed during the day, as described above.

In such a situation, in the air-cooled brine heat pump device 23, the mode is switched from cooling to heating from night to day, and the mode is switched from heating to cooling from day to night. The air-cooled brine heat pump device 23 is used every time mode switching occurs twice a day.
Heat loss occurs in the piping connected to. That is, the brine in the pipe is used for night heat storage operation (cooling operation).
The temperature sometimes drops and the temperature rises during the daytime heating operation. This temperature fluctuation is large from about -5 ℃ to about 55 ℃, which causes a considerable heat loss and leads to an increase in operating cost.

Therefore, when the cooling load of the next day can be sufficiently processed by the cold storage heat remaining in the heat storage tank 21, the night-time heat storage operation of the air-cooling brine heat pump device 23 (cooling operation).
Is prohibited, and the operation of the air-cooled brine heat pump device 23 is limited to daytime heating only.

In this way, the operation of the air-cooled brine heat pump device 23 is limited to only heating, so that the heat loss in the pipe connected to the air-cooled brine heat pump device 23 can be greatly reduced. Thereby, the operating cost can be reduced and the energy saving effect can be obtained.

(2) Next, a case where warm heat is stored in the heat storage tank 21 will be described as an example. At a predetermined time before entering the nighttime power time zone, it is determined whether the cooling load and the heating load are mixed in the air conditioning load of the next day predicted by the air conditioning load predicting unit 32.

When it is determined that the cooling load and the heating load are mixed, the necessary heat storage (hot heat) amount A of the heat storage tank 21 necessary for processing the heating load is detected, and the remaining heat storage (hot heat) amount of the heat storage tank 21 is detected. B is detected. Then, the required heat storage amount A and the remaining heat storage amount B are compared.

When the remaining heat storage amount B is equal to or smaller than the required heat storage amount A (A ≧ B), the flag f is set to "1". Start time of nighttime power hours (10 pm)
Then, the contents of the flag f are confirmed.

When f = 1, the two-way valves 71 and 72 are opened and the heat storage operation (heating operation) of the air-cooled brine heat pump device 23 and the operation of the pump 22 are started. This allows
Hot water is stored in the heat storage tank 21. The remaining two-way valves except the two-way valves 71 and 72 are all closed.

That is, when it is determined that the current remaining heat storage amount B is insufficient, the heat storage operation (heating operation) of the air-cooling brine heat pump device 23 during the nighttime power time period is allowed, and the heat storage of the air-cooling brine heat pump device 23 is allowed. Driving is maximized from the beginning to the end of the night power hours. As a result, as much heat as possible is stored in the heat storage tank 21.

At the end of the nighttime power time zone (8:00 am), the heat storage operation of the air-cooled brine heat pump device 23 and the operation of the pump 22 are stopped, and the two-way valve 71,
72 is closed.

Thereafter (after 8:00 am), according to the predicted air conditioning load (cooling load and heating load) of the air conditioning load predicting section 32 obtained the day before, the stored heat is released from the heat storage tank 21, the cooling operation of the heat pump device 6, The cooling operation of the air-cooled brine heat pump device 23 and the operation of each pump are selectively executed, and the opening / closing of each two-way valve is controlled.

First, for the heating load, the two-way valve 51,
52, 73, 74 are opened and the pumps 7, 24 are operated. When the pump 24 is operated, brine circulates between the heat storage tank 21 and the heat source side coil 11a of the heat exchanger 11,
The heat storage heat of the heat storage tank 21 is transferred to the brine. Further, by operating the pump 7, the load side coil 11 of the heat exchanger 11 is
Water circulates between b and the load side. This circulating water is heated by receiving the heat of brine, that is, heat radiation from the heat storage tank 21, via the heat exchanger 11. In this way, the stored heat is supplied to the load side, and the heating load is processed.

With respect to the cooling load, the two-way valves 41 and 42 are opened to start the cooling operation of the heat pump device 6 and the operation of the pump 5. In this case, the water is cooled by the heat pump device 6 to become cold water, and the cold water flows to the load side by the operation of the pump 5, and the cooling load is processed.

In a situation where all the cooling loads cannot be processed only by the cooling operation of the heat pump device 6, the two-way valves 61, 62, 75, 76 are further opened to perform the cooling operation of the air-cooling brine heat pump device 23 and the pump 8, The operation of 22 is started.

In this case, the brine is cooled by the air-cooled brine heat pump device 23, and the brine is circulated through the heat source side coil 12a of the heat exchanger 12 by the operation of the pump 22. Further, by operating the pump 8, water circulates between the load side coil 12b of the heat exchanger 12 and the load side. This circulating water receives the cold heat of the brine via the heat exchanger 12 and is cooled. As a result, cold heat is supplied to the load side.

Therefore, it is possible to process the heating load of one room and simultaneously process the cooling load of another room. However, when comparing the required heat storage amount A and the remaining heat storage amount B, if the remaining heat storage amount B is larger than the required heat storage amount A (A <
B), the flag f is set to "0".

When f = 0, the heat storage operation (heating operation) of the air-cooled brine heat pump device 23 is prohibited during the nighttime power hours. This is for the following reason. When the cooling load and the heating load are mixed, the air-cooling brine heat pump device 23, as described above, performs the heat storage operation (heating operation) at night.
And perform cooling operation as needed during the day.

In such a situation, in the air-cooled brine heat pump device 23, the mode is switched from heating to cooling from night to day, and the mode is switched from cooling to heating from day to night. The air-cooled brine heat pump device 23 is used every time mode switching occurs twice a day.
Heat loss occurs in the piping connected to. That is, the brine in the pipe is used for night heat storage operation (heating operation).
The temperature sometimes rises and the temperature drops during the daytime cooling operation. This temperature fluctuation is large from about 55 ° C to about -5 ° C, which causes a considerable heat loss and leads to an increase in operating cost.

Therefore, when the heating load of the next day can be sufficiently processed by the stored heat remaining in the heat storage tank 21, the night-time heat storage operation of the air-cooled brine heat pump device 23 (heating operation).
Is prohibited, and the operation of the air-cooled brine heat pump device 23 is limited to daytime cooling only.

In this way, since the operation of the air-cooled brine heat pump device 23 is limited to the cooling only, the heat loss in the pipe connected to the air-cooled brine heat pump device 23 can be greatly reduced. Thereby, the operating cost can be reduced and the energy saving effect can be obtained.

(3) During the summer when only the cooling load is present, cold heat is stored in the heat storage tank 21, and the next operation control is executed.
When the temperature is not high and the cooling load is low, as in the morning, the two-way valves 41 and 42 are opened to start the cooling operation of the heat pump device 6 and the operation of the pump 5.

In this case, the water cooled by the heat pump device 6 flows to the load side by the operation of the pump 5, and the cooling load is processed. When the temperature rises and the cooling load increases, in addition to the cooling operation by the heat pump device 6, the two-way valves 61, 62, 75, 76 are further opened to perform the cooling operation of the air-cooling brine heat pump device 23 and the pumps 8, 22. The operation of is started.

In this case, the brine is cooled by the air-cooled brine heat pump device 23, and the brine is circulated through the heat source side coil 12a of the heat exchanger 12 by the operation of the pump 22. Further, by operating the pump 8, water circulates between the load side coil 12b of the heat exchanger 12 and the load side. This circulating water receives the cold heat of the brine via the heat exchanger 12 and is cooled.

When the temperature rises further in the afternoon and the cooling load reaches its peak, in addition to the cooling operation by the heat pump device 6 and the air-cooled brine heat pump device 23, two-way valves 51, 52, 71, 72, 7 are added.
3, 74 are opened and the pumps 7, 24 are started to operate.

In this case, by operating the pump 24, brine circulates between the heat storage tank 21 and the heat source side coil 11a of the heat exchanger 11. At this time, the cold storage heat of the heat storage tank 21 is transferred to the brine (ice is gradually melted by heat radiation). Further, by operating the pump 7, water circulates between the load side coil 11b of the heat exchanger 11 and the load side. The circulating water receives heat radiated from the heat storage tank 21, that is, cold heat via the heat exchanger 11, and is cooled.

In this way, the processing of the peak portion of the cooling load is brought into a state of being covered by the cold storage heat of the heat storage tank 21.
In this way, the cold energy is stored in the heat storage tank 21 and the peak portion of the cooling load is processed by the cold storage heat, so that the amount of electric power used in the cooling operation of the heat pump device 6 and the air-cooled brine heat pump device 23 is suppressed to a small amount. You can Accordingly, the contract power with the electric power company can be set low.

The air-cooled brine heat pump device 23
The energy consumption increases due to the heat storage operation, but since the discounted charge is applied during the nighttime power hours, the increase in the operating cost due to the heat storage operation itself is slight. Rather, the reduction in operating costs by lowering the contracted electric power is more remarkable.

Conventionally, it is common to determine the contracted electric power based on the afternoon of a summer day when the electric power consumption increases extremely, and it is irrational that a high tariff system is decided only for a few days in the summer. It was the actual situation that caused. This absurdity can be eliminated by using cold storage heat.

In the above embodiment, the normal operation during the daytime except the nighttime power hours is controlled according to the predicted air conditioning load, but it may be controlled while detecting the actual air conditioning load. Further, in the above-described embodiment, the case where the heat storage tank 21 is the ice heat storage system that makes ice and stores cold heat has been described, but it is a cold water heat storage system that stores cold heat by holding cold water or a system that uses a latent heat storage agent. Good. In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

[0070]

As described above, the heat storage air conditioning system device of the first invention predicts the air conditioning load of the next day, and when the predicted air conditioning load includes the cooling load and the heating load, the cooling load or the heating load is mixed. Detects the required heat storage amount of the heat storage tank required for load processing, and detects the remaining heat storage amount of the heat storage tank. If the remaining heat storage amount is greater than the above required heat storage amount, the heat storage operation of the heat source unit during the nighttime power hours Since the configuration is prohibited, the heat loss can be reduced, the operating cost can be reduced, and the energy saving can be achieved.

The control method of the heat storage air conditioning system apparatus of the first invention predicts the air conditioning load of the next day, and when the predicted air conditioning load includes the cooling load and the heating load, it is necessary for processing the cooling load or the heating load. The required heat storage amount of the heat storage tank is detected, and the remaining heat storage amount of the heat storage tank is detected.If the remaining heat storage amount is larger than the above required heat storage amount, the heat storage operation of the heat source device in the nighttime power time zone is prohibited. Therefore, the heat loss can be reduced, the operating cost can be reduced, and the energy saving effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of an embodiment.

FIG. 2 is a block diagram showing a configuration of a main part of a controller in the embodiment.

FIG. 3 is a flowchart for explaining the operation of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cold water return header, 2 ... Cold water return header, 3 ... Hot water return header, 4 ... Hot water return header, 5 ... Pump, 6 ... Heat pump device, 7, 8 ... Pump, 11, 12 ... Heat exchanger, 21 ...
Heat storage tank, 22 ... Pump, 23 ... Air-cooled brine heat pump device, 24 ... Pump, 30 ... Controller, 31 ... Main control unit, 32 ... Air conditioning load prediction unit, 33 ... Residual heat storage amount detection unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahide Yanagi Masahide Yanagi, 4-33 Roppongi, Minato-ku, Tokyo, NTT F. Facilities (72) Inventor Noboru Makita 11 Asahi-cho, Haneda, Ota-ku, Tokyo No. 1 in EBARA CORPORATION (72) Inventor Tomotsu Ishiyama 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Inside EBARA CORPORATION

Claims (2)

[Claims] 1. A heat storage air conditioning system device for operating a heat source device during nighttime power hours to store cold heat or warm heat in a heat storage tank and processing an air conditioning load by heat radiation from the heat storage tank and cooling or heating operation of the heat source device. In the following, means for predicting the air conditioning load for the next day, and means for detecting the required heat storage amount of the heat storage tank necessary for processing the cooling load or the heating load when the predicted air conditioning load includes a cooling load and a heating load. A means for detecting the amount of remaining heat stored in the heat storage tank, and a means for prohibiting the heat storage operation of the heat source device during the nighttime power time period when the amount of remaining heat stored is greater than the detected required amount of heat storage. A heat storage air conditioning system device characterized by the above. 2. A heat storage air conditioning system device for operating a heat source device during nighttime electric power hours to store cold or hot heat in the heat storage tank, and processing an air conditioning load by heat radiation from the heat storage tank and cooling or heating operation of the heat source device. In the following, a step of predicting the air conditioning load of the next day, and a step of detecting a necessary heat storage amount of the heat storage tank necessary for processing the cooling load or the heating load when the cooling load and the heating load are mixed in the predicted air conditioning load, A step of detecting the remaining heat storage amount of the heat storage tank, and a step of prohibiting the heat storage operation of the heat source device during the nighttime power time period when the remaining heat storage amount is larger than the detected required heat storage amount. A method for controlling a heat storage air conditioning system device, which is characterized by the above.