JPH03144236A - Cooling and heating device for multi rooms - Google Patents

Abstract

PURPOSE:To cope with a peak load of a short period of time by a method wherein a thermal accumulating heat exchanger, a thermal radiating heat exchanger and a thermal accumulating tank are arranged in parallel respectively in the first auxiliary heat exchanger of a refrigerant cycle at a heating source and the second auxiliary heat exchanger of utilization side refrigerant cycle heat exchanger with the first auxiliary heat exchanger. CONSTITUTION:A thermal accumulating operation of a heat source side cycle when a cooling is to be required is performed such that refrigerant from a compressor 11 is flowed to a thermal accumulating heat exchanger 24 through a thermal accumulating expansion valve 14 and a three-way changing-over valve 26a. The refrigerant heat exchanges with thermal accumulating material, passes through a three-way changing-over valve 26b and circulates. Under a peak load of a utilization cycle, refrigerants from the utilization heat exchangers 22a and 22b pass through pipes i' and j'. A part of refrigerant adjusted in compliance with a load is sent from a three-way flow rate valve 27a to a thermal radiating heat exchanger 25. The refrigerant is condensed with the thermal accumulating material and sent to a three- way flow rate valve 27b. The remaining refrigerant flows to the second auxiliary heat exchanger 19, the refrigerant is liquefied by the heat exchanger 18. The refrigerant is sent to the three-way flow rate valve 27b, merges with refrigerant from the heat exchanger 25 and the merged refrigerant is circulated. With such an arrangement, a cooling capability is increased and it can cope with a peak load of a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a refrigerant cycle for a multi-room heating and cooling system.

2. Description of the Related Art A conventional multi-room air conditioning system separated into a heat source side refrigerant cycle and a user side refrigerant cycle μ is disclosed in Japanese Patent Laid-Open No. 62-272040.

This will be explained below with reference to the drawings. In Figure 2, 1
1 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 1
4 is a pressure reducing device for cooling, 16 is a heating pressure reducing device, 16 is a check valve that closes the cooling pressure reducing device 14 during heating, 17 is a check valve that closes the heating pressure reducing device 1B during cooling, and 18 is a check valve that closes the heating pressure reducing device 1B. These are connected in an annular manner by the first auxiliary heat exchanger to form a heat source side refrigerant cycle. A second auxiliary heat exchanger 19 is integrally formed to exchange heat with the first auxiliary heat exchanger 18. 2o is a refrigerant amount adjustment tank that adjusts the amount of refrigeration during cooling and heating. Reference numeral 21 denotes a refrigerant conveying device which has a reversible characteristic in which the outflow direction of the refrigerant is opposite during cooling and heating, and is housed in an outdoor unit) f. 22a, 2
2b is the heat exchanger on the user side, which is housed in the indoor unit (x e h) and connected to the outdoor unit (f) through the connecting pipes 1゜i/, J, s/.

The second auxiliary heat exchanger 19, the refrigerant amount adjustment tank 20°, and the refrigerant conveyance device 21. The utilization side heat exchangers 22a, 22b and the connecting pipes i, t/, t, and I are connected in a ring to form a utilization side refrigerant cycle.

The operation of the multi-room heating and cooling system configured as described above will be explained.

During cooling operation, the refrigerant cycle shown by the solid line in the figure is used.In the refrigerant cycle on the heat source side, high temperature and high pressure gas from the compressor 11 passes through the four-way valve 12, radiates heat in the heat exchanger 13 on the heat source side, condenses and liquefies, and then It passes through the valve 16 and is depressurized by the cooling expansion valve 14.
It is evaporated in the auxiliary heat exchanger 18 and passed through the four-way valve 12 to the compressor 1.
Cycle to 2.

At this time, the second auxiliary heat exchanger 19 of the user side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the Ganu refrigerant in the user side refrigerant cycle is cooled and liquefied, and the refrigerant amount adjustment tank 2o The refrigerant is sent to the refrigerant conveying device 21 through the refrigerant conveying device 21, and is sent to the user-side heat exchangers 22a, 22b through the connecting pipes 1 and 1, where it is endothermically evaporated, gasified, and transferred to the connecting pipe i'.

j' to be circulated to the second auxiliary heat exchanger 1e.

On the other hand, during heating operation, the refrigerant cycle is indicated by the broken line in the figure, and in the heat source side refrigerant cycle, the high-temperature, high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18, radiates heat and condenses. It is liquefied, the pressure is reduced by the heating pressure reducing device 16 from the check valve 17, and it is endothermically evaporated in the heat source side heat exchanger 13.
It circulates through the four-way valve 12 to the compressor 11. At this time, the second auxiliary heat exchanger 19 of the user-side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the liquid refrigerant in the user-side refrigerant cycle is heated and gasified, and is used through the connecting pipe 1MI. The refrigerant is sent to the side heat exchanger 22, heated, radiated, liquefied, passed through the connecting pipes i and 1, sent to the refrigerant transport device 21, and circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19.

Problems to be Solved by the Invention However, in the above configuration, the maximum capacity is limited, and the device capacity must be adjusted to match the peak load.

As a result, the equipment capacity increases, leading to increases in initial costs and running costs, leading to energy saving issues.

In view of the above-mentioned problems, the present invention provides a multi-room air conditioning and heating system that is equipped with a device that can handle short-term peak loads and that reduces initial costs and running costs by reducing equipment capacity, as well as saves energy.

Means for Solving the Problems In order to solve the above problems, the multi-room air conditioning system of the present invention has the following features:
Compressor, heat source side heat exchanger, cooling/heating pressure reducing device, and first
A heat source side refrigerant cycle formed by connecting auxiliary heat exchangers in a ring, a second auxiliary heat exchanger formed integrally with the first auxiliary exchanger and exchanging heat, a refrigerant conveying device, and a plurality of user side heat exchangers. a heat storage heat exchanger in parallel with the first auxiliary heat exchanger, a heat radiation heat exchanger that radiates the stored heat in parallel with the second auxiliary heat exchanger, and the heat storage heat exchanger in parallel with the second auxiliary heat exchanger. It is equipped with an exchanger and a heat storage tank having a heat exchanger for heat radiation.

Effect The present invention has the above-described configuration, and stores heat in the heat storage tank at night.
For example, by storing heat (as ice during cooling) and using this heat storage for short-term peak loads, the capacity of the compressor can be reduced and the installed capacity can be reduced.

EXAMPLE Hereinafter, a multi-room air conditioning system according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a refrigerant cycle diagram of the multi-room air conditioning system of the present invention. In the figure, the basic refrigerant cycle that does not use heat storage is the same as in FIG. 2, and here we will explain the difference, that is, the refrigerant cycle that uses heat storage.

A heat storage tank 23 is filled with a heat storage material such as water, and a heat storage heat exchanger 24 stores heat by exchanging heat with the heat storage material, and a heat radiation heat exchanger 2 stores heat by exchanging heat with the heat storage material and radiates hot heat.
1.

26a and 26b are three-way switching valves that switch the refrigerant flow to the first auxiliary heat exchanger and the heat storage heat exchanger 24; 27a;
27b is the second auxiliary heat exchanger 19 and the heat radiation heat exchanger 2;
The operation of a multi-room air-conditioning/heating system having a three-way flow rate valve that adjusts the flow rate of refrigerant to 6 will be described below.

During the heat storage operation of the heat source side refrigerant cycle during cooling, the cooling expansion valve 14 becomes the heat storage expansion valve, and the compression Ia 11° four-way valve 12
．． The refrigerant from the heat source TIII heat exchanger and the check valve 16 passes through the heat storage expansion valve 14, passes through the three-way switching valve 26a, and flows to the heat storage heat exchanger 24, where it exchanges heat with the heat storage material and absorbs heat and evaporates.
It circulates from the four-way valve to the compressor 11 through the three-way switching valve 2eb.

On the other hand, during cooling peak load operation of the user refrigerant cycle,
The heat source side refrigerant cycle enters normal cooling operation using the first auxiliary heat exchanger 18 as an evaporator, and the user side heat exchanger 22 a
The refrigerant from #22b passes through the connecting pipes 1/ and 3/, and a part of the refrigerant adjusted according to the load is sent from the three-way flow valve 27a to the heat exchanger 26 for heat radiation, and is transferred to the heat storage material at about 0°C. The liquid is cooled, condensed, liquefied, and sent to the three-way flow valve 27b.

In addition, the remaining refrigerant adjusted according to the load is discharged through the three-way flow valve 27m, which passes through the connecting pipes 1/ and 3/, through the three-way flow valve 27a.
The refrigerant flows from the auxiliary heat exchanger 19 to the second auxiliary heat exchanger 19, is cooled and liquefied by the first auxiliary heat exchanger 18, is sent to the three-way flow valve 27b, joins with the refrigerant from the heat radiating heat exchanger 26, and enters the refrigerant amount adjustment tank 2o. The refrigerant is circulated from there to the refrigerant conveying device 21. Therefore,
At this time, the cooling capacity of the user-side refrigerant cycle increases as it becomes the sum of the capacity of the heat source-side refrigerant cycle and the capacity of the heat radiation heat exchanger 26.

In addition, the heat storage operation of the heat source side refrigerant cycle during heating is performed by the compressor 1.
1. The refrigerant from the four-way valve 12 is sent from the three-way switching valve 26b to the heat storage heat exchanger 24, where it is cooled by a heat storage material, condensed, and liquefied.
It passes from the three-way switching valve 26a through the check valve 17, is depressurized by the heating expansion valve 16, is endothermically evaporated in the heat source side heat exchanger 13, and is circulated from the four-way valve 12 to the compressor 11.

On the other hand, during peak heating load operation of the user side refrigerant cycle, the heat source side refrigerant cycle has a three-way switching valve 26Jl.

26b is switched to perform normal heating operation using the first auxiliary heat exchanger 18 as a condenser. At this time, the user side heat exchanger 22&,
The refrigerant heat-radiated and condensed in 22b is passed through the connecting pipes l and S.
The refrigerant is sent from the refrigerant transport device 21 to the three-way flow valve 27b through the refrigerant amount adjustment tank 2o. In this three-way flow valve 27b, according to the load, a part of the refrigerant is sent to the radiation heat exchanger 25 where it is heated and gasified by the heat storage material, and the remaining refrigerant is sent to the second auxiliary heat exchanger 19 and the second auxiliary heat exchanger 19. 1 is heated and gasified in the auxiliary heat exchanger 18, and the respective gas refrigerants are combined at the three-way flow valve 27a, and passed through the connecting pipe 11.1/ to the user-side heat exchanger 22.
a, circulates to 22b.

Therefore, at this time, the heating capacity of the user-side refrigerant cycle increases as it becomes the sum of the heating capacity of the heat source-side refrigerant cycle and the capacity of the heat radiation heat exchanger 26.

As described above, according to this embodiment, by storing heat at night, the capacity of the heat source side refrigerant cycle and the capacity of the heat radiation heat exchanger installed inside the heat storage tank are increased during peak loads during cooling and heating. Since the compressor can handle peak loads, the capacity of the compressor can be reduced and the equipment capacity can be reduced. Therefore, it is useful for reducing initial cost and running cost and for energy saving.

In this example, the heat storage utilization was explained by operating the heat source side refrigerant cycle. However, in some cases, it is also possible to perform cooling/heating operation using only heat storage without operating the heat source side refrigerant cycle. Needless to say, the mechanical properties are improved. Further, in the embodiment, an outdoor unit including a heat storage tank is used, but the heat storage tank may be separated from the heat source side cycle.

Effects of the Invention As described above, the present invention separates the refrigerant cycle into a heat source side refrigerant cycle and a user side refrigerant cycle, and includes a heat storage heat exchanger in parallel with the first auxiliary heat exchanger and a heat radiating heat exchanger in parallel with the second auxiliary heat exchanger. By providing a heat exchanger for heating and cooling, and a heat storage tank having the heat exchanger for heat storage and the heat exchanger for heat radiation, heat is stored at night and the heat source side refrigerant cycle is used during peak cooling/heating loads of the user side refrigerant cycle. The capacity of the heat exchanger for heat dissipation is added to the capacity, and it becomes possible to cope with the peak load. Therefore, the capacity of the compressor can be made small and the capacity of the equipment can be reduced, which is effective in reducing initial cost and running cost, as well as energy saving.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant cycle diagram of an air conditioning system according to an embodiment of the present invention, FIG. 2 is a connection diagram of an indoor unit according to another embodiment of the invention, and FIG. 3 is a refrigerant cycle diagram of a conventional air conditioning system. 13... Heat source side heat exchanger, 18... First auxiliary heat exchanger, 19... Second auxiliary heat exchanger,
21... Refrigerant conveyance device, 22... Usage side heat exchanger, 23... Heat storage tank, 24...
- Heat exchanger for heat storage, 26...Heat exchanger for heat radiation.

Claims (1)

[Scope of Claims] (1) A heat source side refrigerant cycle formed by connecting a compressor, a heat source side heat exchanger, a pressure reducing device for heating and cooling, and a first auxiliary heat exchanger in an annular manner, and the first auxiliary heat exchanger. a user-side refrigerant cycle having a second auxiliary heat exchanger and a refrigerant conveyance device integrally formed to exchange heat, and a plurality of user-side heat exchangers;
A heat storage tank having a heat storage heat exchanger in parallel with the auxiliary heat exchanger, a heat radiation heat exchanger that radiates stored heat in parallel with the second auxiliary heat exchanger, and the heat storage exchanger and the heat radiation heat exchanger. Multi-room air conditioning and heating system equipped with (2) The multi-room air conditioning system according to claim 1, wherein the compressor is equipped with a capacity control compressor. (3) The multi-room air conditioning system according to claim 1, in which the heat source side refrigerant cycle and the usage side refrigerant cycle use different refrigerants. (4) The multi-room air-conditioning system according to claim 1, wherein stacked heat exchangers are used as the first auxiliary heat exchanger and the second auxiliary heat exchanger.