JP3043080B2 - Air conditioning system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for houses and buildings.

[0002]

2. Description of the Related Art Generally, in a building air conditioning system,
Normally, water is used as a heat medium for transferring heat between the heat source device and the air conditioner. By the way, if this air conditioner is installed in a room to be air-conditioned (living room), there is a risk of a water leakage accident in the living room, which is not preferred.

Therefore, in an air-conditioning system of a modern building, heat obtained by a heat source device is stored in a heat storage tank, and a refrigerant such as Freon is used as a heat medium between the heat storage tank and a heat exchanger in a living room. It has been proposed (for example,
No. 35216).

[0004]

According to this proposal, refrigerant is supplied to a refrigeration circuit (refrigeration cycle) in a heat source device and a heat transfer circuit (circulation cycle) connecting a heat storage tank and a heat exchanger in a living room. It is conceivable that the amount of the refrigerant increases due to being enclosed. For example, when this proposal is applied to a high-rise building, if the distance between the heat storage tank and the heat exchanger in the living room increases, the length of the pipe connecting the two will also increase, and the refrigerant sealed in this pipe will become longer. Usage increases.

An object of the present invention is to propose an air conditioning system capable of reducing the amount of refrigerant used and performing cooling operation even when the amount of stored heat is reduced.

[0006]

According to the present invention, a compressor, a condenser, a decompressor, an evaporator, and a gas-liquid separator are sequentially connected to form a refrigeration cycle. The heat exchanger provided in the utilization side chamber is placed in parallel with the evaporator, and the refrigerant pipe on the inlet side of the heat exchanger is connected to the liquid refrigerant layer of the gas-liquid separator. A refrigerant circulation pump is arranged on either the inlet side or the outlet side of the refrigerant pipe, ice is formed in the heat storage layer in the refrigeration cycle by operation of the compressor during heat storage operation, and by operation of the refrigerant circulation pump during cooling operation. In an air conditioning system that has a circulation cycle that circulates the refrigerant liquefied by the ice in the heat storage layer to the heat exchanger in the utilization side chamber, if the amount of liquid refrigerant in the gas-liquid separator falls below a predetermined value during heat storage operation, the compressor Was operated and condensed in the condenser It is obtained so as to guide the refrigerant to the gas-liquid separator.

[0007]

[Action] The refrigeration cycle is operated at night or the like to produce ice by the action of the evaporator of the heat storage tank. Then, by operating the refrigerant circulation pump in the daytime, the refrigerant circulates between the evaporator in the heat storage tank and the heat exchanger in the use side chamber, and the refrigerant cooled by the ice in the heat storage tank passes through the heat exchanger. It is sent in and can cool the use side room. Here, when the cooling capacity of ice in the heat storage tank decreases (insufficient), the amount of refrigerant liquefied in the evaporator in the heat storage tank decreases, and the amount of liquid refrigerant in the gas-liquid separator decreases. When the pressure falls below a predetermined value, the compressor is operated to guide the liquid refrigerant condensed by the condenser to the gas-liquid separator. As a result, a certain amount or more of the liquid refrigerant is always stored in the gas-liquid separator, and the liquid refrigerant is guided to the heat exchanger in the use side chamber.

[0008]

FIG. 1 shows an air conditioning system 1 installed in a high-rise building or the like.
And a heat exchanger 4 arranged in the use side room (living room) 3 of the building
And refrigerant tubes 18 and 19 on the inlet and outlet sides of the heat exchanger 4. This heat source device is installed on the rooftop or basement of a high-rise building.

In this heat source device 2, 6 is a compressor, 7
Is a condenser, 8 is a heat exchange fan of the condenser 7, 9 is a decompressor, 10 is an evaporator, 11 is a gas-liquid separator, and these devices are connected in a ring by a refrigerant pipe to constitute a refrigeration cycle. I have. Reference numeral 12 denotes a float switch housed in the gas-liquid separator 11, the operation of which will be described later. A heat storage tank 13 stores water 14 as a heat storage agent. The evaporator 10 is disposed in the heat storage tank 13. Reference numeral 15 denotes a bypass pipe, which bypasses the decompressor 9 and the evaporator 10, and has an outlet end connected to a gas layer (upper part) 16 of the gas-liquid separator 11. Reference numeral 17 denotes a bypass valve provided in the bypass pipe 15.

The refrigerant pipe 18 on the outlet side of the heat exchanger 4 is
The refrigerant pipe 19 is connected to a refrigerant pipe connecting the decompressor 9 and the evaporator 10, and the refrigerant pipe 19 on the inlet side is a liquid medium layer part (lower part) of the gas-liquid separator 11.
Connected to 20. Reference numeral 21 denotes a refrigerant circulation pump provided in the refrigerant pipe 19 on the outlet side.

In the air-conditioning system having such a configuration, first, a heat storage operation is performed at night (from 10:00 pm to 8:00 am the next day). Electricity rate during this time (nighttime power)
Is inexpensive, about 1/4 of the daytime electricity rate, and ice is made in the heat storage tank 13 using this inexpensive nighttime electric power. That is, the compressor 6 is operated (the operation of the refrigerant circulation pump 21 is stopped), and the refrigerant discharged from the compressor 6 flows as shown by the solid arrow. Then, the water in the heat storage tank 13 is frozen by the heat absorbing action of the evaporator 10. The refrigerant evaporated by the evaporator 10 during the heat storage operation passes through the gas-liquid separator 11, is compressed again by the compressor 6, and is led to the condenser 7.

In the daytime (8:00 am to 10:00 pm), the use side room is cooled by the heat of the ice in the heat storage tank 13.
That is, during the cooling operation, the refrigerant circulating pump 21 is operated (the operation of the compressor 6 is stopped), and the refrigerant liquefied by the ice in the heat storage tank 13 is sent to the heat exchanger 4 of the use side chamber 3 by the refrigerant circulating pump 21. . Then, the gas refrigerant vaporized in the heat exchanger 4 is condensed by the ice in the heat storage tank 13 and enters the gas-liquid separator 11. That is, the heat exchanger 4 acts as a condenser, and the utilization side chamber 3 is cooled by the vaporization of the cooling. During this cooling operation, the refrigerant circulating through the evaporator 10 and the heat exchanger 4 of the heat storage tank 13 is the same as the refrigerant flowing through the refrigeration cycle during the above-described heat storage operation. That is, in this air-conditioning system 1, the refrigerant used in the refrigeration cycle and the refrigerant used in the circulation cycle are the same, and are compared with the amount of refrigerant sealed in the air-conditioning system in which both cycles are independent as in the related art. The amount can be reduced.

Further, when the cooling capacity of the heat storage tank 13 by the ice in the heat storage tank 13 is reduced (insufficient), the amount of refrigerant liquefied in the evaporator 10 in the heat storage tank 13 is reduced, and the gas-liquid separator 1
The storage amount of the liquid refrigerant in 1 also decreases. This decrease is detected by the float switch 12 in the gas-liquid separator 11, and when this switch is operated, the heat exchange fan 8 of the compressor 6 and the condenser 7 is operated and the bypass valve 17 is opened. Thus, the liquid refrigerant condensed in the condenser 7 flows into the gas-liquid separator 11 via the bypass pipe 15 together with the liquid refrigerant condensed in the evaporator 10 of the heat storage tank 13.

In this way, a certain amount or more of the liquid refrigerant is always stored in the gas-liquid separator 11 so that the liquid refrigerant always flows to the heat exchanger 4.

Therefore, even if a shortage occurs only with the cooling capacity of the ice in the heat storage tank 13, the shortage can be covered by the operation of the compressor 6. here,
If the cooling capacity (accumulation capacity of daytime cooling) exceeds the heat storage capacity of the ice in the heat storage tank 13, the compressor 6 → condenser 7
The cooling is performed by the refrigerant circulation cycle of the bypass valve 17 and the gas-liquid separator 11.

In the daytime (8:00 am to 10:00 pm)
The reason why the cooling operation is performed by the operation of the circulation pump 21 is to smooth the power consumption by not operating the compressor 6 at the peak time of the power.

In the nighttime heat storage operation, the cooling operation can be performed by operating the circulation pump 21 and opening the bypass valve 17.

In the above embodiment, the refrigerant circulating pump 21 is provided in the refrigerant pipe 19 on the inlet side of the heat exchanger 4, and the pump 2
Although 1 functions as a so-called “liquid pump”, this pump may be provided in the refrigerant pipe 18 on the outlet side of the heat exchanger 4 to function as a “gas pump”.

[0019]

As described above, according to the air conditioning system of the present invention, a refrigeration cycle for storing heat in a heat storage tank,
Since the same refrigerant is used for the circulation cycle in which the heat stored in the heat storage tank is transferred to the heat exchanger in the utilization side chamber, the amount of refrigerant used in the air conditioning system constituted by both cycles can be reduced. In addition, when the cooling capacity by the ice in the heat storage tank is insufficient during the heat storage operation by the circulation cycle, and the amount of the liquid refrigerant in the gas-liquid separator falls below a predetermined value, the cooling capacity may be reduced. According to the present invention, at this time, by operating the compressor, the refrigerant is condensed by the condenser to be a liquid refrigerant, and the liquid refrigerant is guided to the gas-liquid separator, so that the decrease in the cooling capacity can be suppressed. . Further, the gas-liquid separator functions to prevent the liquid refrigerant from returning to the compressor during the refrigeration cycle (heat storage) operation, and adjusts the liquid refrigerant amount during the circulation cycle (cooling) operation. Therefore, the cost can be reduced by utilizing one container in any cycle.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of the air conditioning system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioning system 4 Heat exchanger 6 Compressor 7 Condenser 9 Decompressor 10 Evaporator 11 Gas-liquid separator 13 Heat storage tank 18, 19 Refrigerant pipe 21 Refrigerant circulation pump

Claims (1)

(57) [Claims] 1. A refrigeration cycle is constructed by connecting a compressor, a condenser, a decompressor, an evaporator, and a gas-liquid separator sequentially in a ring shape, and the evaporator is housed in a heat storage tank and provided in a heat exchanger provided in a utilization side chamber.
A heat exchanger is arranged in parallel with the evaporator and the heat exchanger
One connecting the refrigerant pipe on the mouth side to the liquid refrigerant layer of the gas-liquid separator
On the other hand, either the inlet side or the outlet side refrigerant pipe
A refrigerant circulation pump is disposed in the compressor during the heat storage operation.
Forming ice in the heat storage layer in the refrigeration cycle by the operation of
During the cooling operation, the heat storage is performed by operating the refrigerant circulation pump.
The refrigerant liquefied by the ice layer is circulated to the heat exchanger in the side chamber.
In an air conditioning system that forms a circulation cycle,
During the heat storage operation, the amount of the liquid refrigerant in the gas-liquid separator becomes a predetermined value.
When the following is reached, operate the compressor and condense in the condenser.
An air conditioning system , wherein the liquid refrigerant is guided to the gas-liquid separator .