JP2000257920A - Heat storage type air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operating efficiency of a refrigerating machine and reduce the heat loss of a heat storage tank by a method, wherein a first air conditioner, cooling or heating outdoor air by the heat source of heat storage water in the heat storage tank and supplying the outdoor air into respective rooms of a building, and a second air conditioner, series different from the first air conditioner and processing the cooling or heating load of respective rooms, are provided. SOLUTION: A heat storage tank ST is constructed under the ground of a building 1. A second air conditioner or an absorption type cold/hot water producer AR, a first air conditioner for processing outdoor air load or a water heat source type cooling and concurrent heating air conditioner OHU, an air heat source type heat pump chiller CR1 for heat storage, and a year-round cold water manufacturing air-cooled refrigerating machine CR2 are installed at the outside of the building 1. In summer, an outdoor air load is dealt with by the heat pump chiller CR1 and the first air conditioner OHU, treating the outdoor air load. An indoor load is dealt with by the second air conditioner or the absorption type cold and hot water producer AR and an FCU. According to this method, the heat storage temperature of the heat storage tank ST can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a regenerative air conditioning system.

[0002]

2. Description of the Related Art A conventional regenerative air conditioning system will be described with reference to FIGS. A heat storage tank ST is constructed under the building 1, and an absorption type cold / hot water generator (second
Air conditioner) AR, a water heat source type cooling / heating air conditioner (first air conditioner) OHU for external air load treatment, and an air heat source type heat pump chiller (heat pump type refrigerator) CR1 for heat storage.
And an air-cooled refrigerator CR2 for producing chilled water throughout the year. Cold and hot water supply headers A1 and A2 and cold and hot water return headers B1 and B2 are provided, and a heat pump chiller CR1 or a refrigerator CR2 is connected to the headers A1 and B1 via a primary pump P1. The water connected to the heat exchanger HX via the heat storage tank ST is cooled or heated. Also, header A
1, B1 are connected to a fan coil unit FCU for air-conditioning the inside of each room R via a secondary pump P2,
A refrigerator CR2 is connected to 2 and B2 via a primary pump P1, and is connected to a year-round cooling system FCU (not shown) such as a computer room via a secondary pump P2. Further, the outside air cooled or heated by the air conditioner OHU is configured to be supplied to each room R via the duct D.

[0003] An operation method of the regenerative air conditioning system having the above configuration will be described with reference to FIG. In summer, the heat pump chiller CR1 is operated at night using electric power at midnight, and cold water of about 7 ° C. is stored in the heat storage tank ST. During the daytime,
The air conditioner OHU is operated using the cold water in the heat storage tank ST as a heat source,
The outside air is cooled and supplied to each room R, and the absorption-type cold / hot water generator AR is operated to supply cold water of about 7 ° C. to the secondary pump P2.
Circulates through each room R and the FCU of the year-round cooling system. In winter, the heat pump chiller CR1 is operated at night using electric power at midnight to store hot water of about 45 ° C. in the heat storage tank ST. During the daytime, the air conditioner OHU is operated by using the hot water in the heat storage tank ST as a heat source, the outside air is heated and supplied to each room R, and the absorption-type cold / hot water generator AR is operated, and hot water of about 45 ° C. is supplied to each room. R is circulated to the RCU, and the refrigerator CR2 is operated to circulate low-temperature chilled water of about 7 ° C. to the FCU of the annual cooling system.

[0004]

However, in the above-mentioned conventional system, the heat source water of the air conditioner OHU for processing the outside air load and the cold / hot water generated in the absorption type cold / hot water generator AR are mixed in the supply header A1. Therefore, it is necessary to maintain 7 ° C. cold water in summer to increase dehumidification capacity and 45 ° C. warm water in winter, and as a result, as shown in FIG. 7, the refrigerator COP (operating efficiency) decreases. In addition, there is a problem that heat loss of the heat storage tank increases.

In particular, in a classroom such as a school, a conference room, or a building accommodating a large number of people in a room, the required air supply (ventilation) per person is determined from various standards. As shown, the external air load to be processed increases, and the conventional air conditioning system has a problem that the efficiency is further reduced.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and improves the operating efficiency of a refrigerator by using energy stored only when the external air load is large to process the external air load. An object of the present invention is to provide a regenerative air conditioning system capable of reducing heat loss in a tank.

[0007]

For this purpose, a regenerative air conditioning system according to claim 1 of the present invention comprises a heat storage tank ST installed in a building and a heat pump refrigerator CR1 for storing cold and hot water in the heat storage tank. A first air conditioner O that uses the heat storage water in the heat storage tank as a heat source to cool or heat the outside air and supply it to each room of the building.
An HU and a second air conditioner AR, FCU for processing a cooling / heating load of each room in a separate system from the first air conditioner are provided. In item 1, when the outside air load is large, the outside air load is processed by the stored energy, and when the outside air load is small,
It is characterized in that the outside air load and the cooling / heating load of each room are processed by the stored energy. The numbers added to the above configuration are for comparison with the drawings for easy understanding, and do not limit the configuration of the present invention at all.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of a regenerative air conditioning system of the present invention. In the basement of the building 1, a heat storage tank ST is constructed, and outside the building 1, an absorption-type cold / hot water generator AR, a water-heat source-type cooling / heating air conditioner OHU for treating an external air load, and an air-heat source type for storing heat are provided. A heat pump chiller CR1 and an air-cooled refrigerator CR2 for producing cold water all year round are installed. The cold / hot water supply header A and the cold / hot water return header B are configured such that the heat storage side headers A1, B1, the use side headers A2, B2, and the yearly cold water side headers A3, B3 can be communicated or divided by opening and closing the valves V1, V2. I have.

A heat pump chiller CR1 or a refrigerator C is connected to the heat storage side headers A1 and B1 via a primary pump P1.
R2 is connected and connected to the heat exchanger HX via the primary pump P1 to cool or heat water circulating in the heat storage tank ST. User side header A2, B2
Is connected to a fan coil unit FCU for air-conditioning the inside of each room R via a secondary pump P2, and a refrigerator CR2 is connected to the year-round chilled water side headers A3 and B3 via a primary pump P1, It is connected via a secondary pump P2 to an FCU (not shown) for a year-round cooling system such as a computer room. Further, the outside air cooled or heated by the air conditioner OHU is configured to be supplied to each room R via the duct D.

An operation method of the regenerative air conditioning system of the present invention having the above configuration will be described with reference to FIGS. 1 and FIGS. 3 to 5 are diagrams showing each operation mode, and FIG. 2 is a diagram for explaining the water supply temperature and the heat storage temperature in each mode.

FIG. 1 shows a summer mode (mid-June to 9 in FIG. 2).
Mon), the valve V1 is closed, the valve V2 is opened, and the heat storage side headers A1, B1 and the use side headers A2, B2
In addition, the headers A3 and B3 for the cold water side all year are made independent.
The heat pump chiller CR1 is operated at night (using CR2 if necessary) using electric power at midnight, and one is stored in the heat storage tank ST.
High-temperature cold water of about 5 ° C. is stored. During the daytime, the air conditioner OHU is operated using the high-temperature cold water in the heat storage tank ST as a heat source,
The outside air is cooled and supplied to each room R, and the absorption-type cold / hot water generator AR is operated so that low-temperature cold water of about 7 ° C. is circulated to each room R and the FCU of the year-round cooling system by the secondary pump P2. ing.

FIG. 3 shows the winter mode (from December to February in FIG. 2).
And the valves V1 and V2 are connected to the heat storage side header A1,
B1, the use-side headers A2 and B2, and the year-round chilled water-side headers A3 and B3 are independent of each other. The heat pump chiller CR1 is operated at night using electric power at midnight, and low-temperature hot water of about 20 ° C. is stored in the heat storage tank ST. During the daytime, the air conditioner OHU is operated by using the low-temperature hot water in the heat storage tank ST as a heat source, the outside air is heated and supplied to each room R, and the absorption-type cold / hot water generator AR is operated to supply high-temperature hot water of about 45 ° C. The refrigerant is circulated to the FCU of each room R, and the refrigerator CR2 is operated to circulate low-temperature chilled water of about 7 ° C. to the FCU of the annual cooling system.

FIG. 4 shows the operation in the first period (March, April, November in FIG. 2) near winter, in which the valve V1 is opened, the valve V2 is closed, and the heat storage side headers A1, B1 are used. The side headers A2 and B2 communicate with each other, and the year-round chilled water side headers A3 and B3 are made independent. The heat pump chiller CR1 is operated at night using electric power at midnight, and the heat storage tank S is operated.
A low temperature hot water of about 30 ° C. is stored in T. During the daytime, the air conditioner OHU is operated using the low-temperature hot water in the heat storage tank ST as a heat source, and the outside air is heated and supplied to each room R, and the low-temperature hot water in the heat storage tank ST as the heat source is circulated through the FCU in each room R, The operation of the absorption-type cold / hot water generator AR is not performed unless it is necessary.

FIG. 5 shows the operation in the intermediate period 2 mode (May and October in FIG. 2) near summer, in which the valve V1 is opened, the valve V2 is closed, and the heat storage side headers A1, B1 and the usage side header A2. , B2 and the header A
3, B3 is independent. The heat pump chiller CR1 is operated at night using electric power at night, and 10 hours is stored in the heat storage tank ST.
Store low-temperature hot water of about ℃. During the daytime, the air conditioner OHU is operated using the low-temperature chilled water in the heat storage tank ST as a heat source to cool the outside air and supply it to each room R, and circulate the low-temperature chilled water from the heat storage tank ST to the FCU in each room R, The operation of the absorption-type cold / hot water generator AR is not performed unless it is necessary.

The operation and effect of the present invention described above will be described. FIG. 6 is a diagram for explaining the basic concept of the present invention. That is, in the psychrometric chart shown in FIG. 6A, in the summer season, when the outside air temperature is 32 ° C. and the target value of the room temperature is 26 ° C., the outside air load is equal to the heat pump chiller CR1 that stores heat in the heat storage tank ST. The indoor interior and the perimeter load, which are covered by the air conditioner OHU that processes the outside air load, are covered by the absorption-type cold / hot water generators AR and FCU, thereby lowering the heat storage temperature of the heat storage tank ST. Becomes possible. This method is effective when the ratio of the outside air load is large as in the summer, as shown in FIG. As shown in FIG. 6 (C), in the interim period, the ratio of the outside air load is small, so the method of FIG. 6 (A) is not adopted, and as described in FIGS. The system is switched to a system in which air conditioning is performed only by a heat storage source without operating the AR.

FIG. 7 is a diagram for explaining the effect of the present invention, which is calculated by assuming the case of an underground pit type using a building frame. In both heating and cooling / heating in the middle period, the operation efficiency of the refrigerator can be improved and the heat loss of the heat storage tank can be reduced.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, in the above embodiment, the absorption-type cold / hot water generator AR is adopted as the second air conditioner, and the cold / hot water is circulated to the FCU of each room R.
Cooling / heating water is supplied to each room R by the
U may be circulated, or a package air conditioner may be provided in each room R. In addition, the heat storage tank is not limited to the one using the building frame, but is also effective in the above-ground tank type.

[0018]

As is clear from the above description, according to the present invention, by using the energy stored when the external air load is large only for the processing of the external air load, the heat storage temperature is high during cooling and during heating. Since the temperature can be reduced, the operating efficiency of the refrigerator can be improved and the heat loss of the heat storage tank can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a regenerative air conditioning system of the present invention.

FIG. 2 is a diagram for explaining an operation method of the regenerative air conditioning system of the present invention.

FIG. 3 is a diagram for explaining an operation method of the regenerative air conditioning system of the present invention.

FIG. 4 is a diagram for explaining an operation method of the regenerative air conditioning system of the present invention.

FIG. 5 is a diagram for explaining an operation method of the regenerative air conditioning system of the present invention.

FIG. 6 is a diagram for explaining a basic concept of the present invention.

FIG. 7 is a diagram for explaining the effect of the present invention.

FIG. 8 is a configuration diagram of a conventional thermal storage type air conditioning system.

9 is a diagram for explaining an operation method of the air conditioning system of FIG.

FIG. 10 is a diagram for explaining a problem of the present invention.

[Explanation of symbols]

 1: Building R: Room ST: Heat storage tank CR1: Heat pump refrigerator OHU: First air conditioner AR, FCU: Second air conditioner

Claims (2)

[Claims] 1. A heat storage tank installed in a building, a heat pump refrigerator for storing cold and hot water in the heat storage tank, and cooling or heating the outside air using the heat storage water in the heat storage tank as a heat source to supply to each room of the building. A regenerative air conditioning system, comprising: a first air conditioner that performs cooling and a second air conditioner that processes a cooling / heating load of each room in a system different from the first air conditioner. 2. When the outside air load is large, the outside air load is processed by the stored energy, and when the outside air load is small, the outside air load and the cooling / heating load of each room are processed by the stored energy. The regenerative air conditioning system according to claim 1.