JPH0476333A - Cooling and heating device - Google Patents

Abstract

PURPOSE:To enable an operation of a liquid pump to be stopped during a heating operation by a method wherein an indoor evaporator also acting as a condensor is disposed at a location above a liquid accepting tank and an evaporator is disposed at a location below the liquid accepting tank. CONSTITUTION:During a heating operation, a cold source of cold water is supplied to a cold heat source supplying pipe 27 of a condensor 25, for example. A liquid pump 31 is operated. Then, refrigerant in a liquid accepting tank 21 passes through the first pipeline 29, flows into an indoor evaporator also acting as a condensor 23 so as to cool indoor air while accepting an evaporating action and it passes through the second pipe line 37, flows into the condensor 25, where it receives a condensing action. After this operation, it passes through the third pipe line 39 and it circulates within the liquid accepting tank 21. In turn, during a heating operation, hot source of hot water, for example, is supplied to a hot heat source supplying pipe 28 of an evaporator 26 and then a liquid pump 31 is stopped. The refrigerant within the liquid accepting tank 21 passes through the fourth pipe line 41 and flows into the evaporator 26 due to the fact that the evaporator 26 is disposed below the liquid accepting tank 21, where it receives an evaporating action and is gasified. The refrigerant passes through the third pipe passage 45, flows into an indoor evaporator also acting as the condensor 23, where it receives a condensing action to heat indoor air and thereafter it passes through the sixth pipe line 47 by its own weight and naturally circulated within the liquid accepting tank 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an air conditioning system, and more particularly to an air conditioning system using a refrigerant that undergoes a gas-liquid phase change.

[Prior Art] Conventionally, as a heating and cooling device using a refrigerant that changes gas-liquid phase, such as a fluorocarbon-based refrigerant, there is one disclosed in Japanese Patent Laid-Open No. 2-57835, which was previously filed by the present applicant. Are known.

FIG. 4 shows the air-conditioning system disclosed in this publication. It is configured by disposing at least one indoor evaporator/condenser 15 that exchanges heat with the indoor evaporator/condenser 15, necessary piping and cooling/heating switching valves, and a liquid pump 17 that performs a heat cycle using these. , Freon-based refrigerants are used as heat transport means.

In the above-mentioned air-conditioning equipment, a fluorocarbon-based refrigerant is circulated as a heat transport means, which reduces the amount of refrigerant transported, reduces power consumption, and reduces the size of piping to save installation space. It becomes possible to save money.

In addition, conventional liquid pump systems can only perform air conditioning, but this air conditioning system has a reversible cycle, so it can be used for both cooling and heating purposes.It is also suitable for use as a DHC heat source, and can reduce indoor loads. Unbalance can also be easily controlled.

[Problem to be solved by the invention]

However, in such conventional heating and cooling systems, it is necessary to constantly operate the liquid pump 17 to forcefully circulate the refrigerant during both cooling and heating, and a large amount of electrical energy is required to operate the liquid pump 17. There was a problem.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a heating and cooling device that can stop the operation of a liquid pump during heating.

[Means to solve the problem]

The air conditioning system according to the present invention includes a liquid receiving tank that stores a refrigerant in a liquid state that undergoes a gas-liquid phase change, an indoor evaporator and condenser that exchanges heat between the refrigerant and indoor air, and a a condenser that exchanges heat with a cold source during cooling; an evaporator that exchanges heat between the refrigerant and an external heat source during heating; and an outlet side of the liquid receiving tank and one of the indoor evaporator and condenser. a second pipe line connecting the other side of the room evaporator/condenser and one side of the condenser; a third pipe line connecting the other side and the inlet side of the liquid receiving tank, a fourth pipe line connecting the outlet side of the liquid receiving tank and one side of the evaporator, and the other side of the evaporator. a fifth pipe line connecting the other side of the room evaporator/condenser; and a sixth pipe line connecting one side of the room evaporator/condenser and the inlet side of the liquid receiving tank. The indoor evaporator/condenser is disposed above the liquid receiving tank, and the evaporator is disposed below the liquid receiving tank.

[For production]

In the present invention, during cooling, the liquid pump is operated;
The refrigerant in the receiving tank flows into the indoor evaporator/condenser through the first pipe, where it undergoes evaporative action to cool the indoor air, and then passes through the second pipe to the condenser. The liquid flows therein, undergoes a condensation action, and then circulates into the receiving tank through the third pipe.

On the other hand, during heating, the liquid pump is stopped, and since the evaporator is located below the liquid receiving tank, the refrigerant in the liquid receiving tank flows into the evaporator through the fourth pipe in a natural circulation state. Here, the air undergoes evaporative action and flows through the fifth pipe to the indoor evaporator/condenser, where it receives the condensing action and heats the indoor air, and then passes through the sixth pipe. Natural circulation within the liquid receiving tank.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 shows an embodiment of the air conditioning system of the present invention, and in the figure, reference numeral 21 indicates a liquid receiving tank that stores a refrigerant that changes gas-liquid phase, such as a fluorocarbon refrigerant, in a liquid state. ing.

Reference numeral 23 indicates a plurality of indoor evaporators/condensers (only one is shown) that exchange heat between the refrigerant and indoor air.

Reference numeral 25 indicates a condenser for exchanging heat between the refrigerant and a cold source from the outside, and a cold source supply pipe 27 for supplying a cold source such as cold water from the outside is inserted through the condenser 25. ing.

Reference numeral 26 indicates an evaporator that exchanges heat between the refrigerant and an external heat source, and a heat source supply pipe 28 for supplying a heat source such as hot water from the outside is inserted through the evaporator 26. ing.

A first pipe line 29 is formed by connecting the outlet side of the liquid receiving tank 21 and one side of the indoor evaporator/condenser 23. In order, liquid pump 31. Open/close valve 33. A control valve 35 is arranged.

Further, a second pipe line 37 is formed by connecting the other side of the indoor evaporator/condenser 23 and one side of the condenser 25.

Further, a third pipe line 39 is formed by connecting the other side of the condenser 25 and the inlet side of the liquid receiving tank 210.

A fourth pipe line 41 is formed by connecting the outlet side of the liquid receiving tank 21 and one side of the evaporator 26, and an on-off valve 43 is disposed in this fourth pipe line 41.

Further, a fifth pipe line 45 is formed by connecting the other side of the evaporator 26 and the other side of the indoor evaporator/condenser 23.

Furthermore, a sixth pipe branched from between the on-off valve 33 and the control valve 35 of the first pipe line 29 and connected to the inlet side of the liquid receiving tank 21.
A pipe line 47 is arranged, and an on-off valve 49 is arranged in this sixth pipe line 47.

A control valve 53 whose opening degree is controlled by a signal from a pressure sensor 51 arranged in the second pipe line 37 is arranged in the cold source supply pipe 27.
The condensation of the refrigerant in the condenser 25 is controlled.

Further, a control valve 57 whose opening degree is controlled by a signal from a pressure sensor 55 arranged in the fifth pipe line 45 is arranged in the heat source supply pipe 28.
The evaporation of the refrigerant in the evaporator 26 is controlled.

Further, the control valve 35 disposed in the first conduit 29 is configured to have its opening degree controlled by a temperature sensor 59 disposed indoors.

Further, a differential pressure sensor 61 that measures the differential pressure before and after the liquid pump 31 is disposed in the first pipe line 29, and is configured so that the operation of the liquid pump 31 is controlled by this differential pressure sensor 61. ing.

In this embodiment, the indoor evaporator/condenser 23 is
It is disposed above the connection portion between the liquid receiving tank 21 and the sixth pipe line 47 by a height H.

Further, the evaporator 26 is disposed a height below the liquid level in the liquid receiving tank 21.

In addition, in the figure, numerals 63 and 65 indicate on-off valves.

In the air conditioning system configured as described above, as shown in FIG. 2, during cooling, the cold source supply pipe 27 of the condenser 25
For example, a cold source consisting of cold water is supplied to the liquid pump 31, and the liquid pump 31 is operated.

Then, the refrigerant in the liquid receiving tank 21 flows into the indoor evaporator/condenser 23 through the first pipe line 29, where it receives the evaporation action and cools the indoor air. through the condenser 25, where it is subjected to condensing action, and then the third
The liquid is circulated through the pipe line 39 into the liquid receiving tank 21 .

In addition, in FIG. 2, the black-colored on-off valves each indicate a closed state, and the white on-off valves indicate an open state.

On the other hand, during heating, as shown in FIG. 3, a heat source made of, for example, hot water is supplied to the heat source supply pipe 28 of the evaporator 26, and the liquid pump 31 is stopped.

Since the evaporator 26 is disposed below the liquid receiving tank 21, the refrigerant in the liquid receiving tank 21 is transferred to the fourth pipe line 4.
1 and flows into the evaporator 26, where it is gasified by evaporation, and passes through the fifth pipe 45 to the indoor evaporator/condenser 2.
The liquid flows into the liquid receiving tank 21, where it condenses and heats the indoor air, and then naturally circulates through the sixth pipe line 47 into the liquid receiving tank 21 due to its own weight.

In addition, in FIG. 3, the black-colored on-off valves each indicate a closed state, and the white on-off valves indicate an open state.

Therefore, in the air conditioning system configured as described above, the indoor evaporator/condenser 23 is disposed above the liquid receiving tank 21, and the evaporator 23 is disposed below the liquid receiving tank 21.
6, during heating, the refrigerant in the liquid receiving tank 21 flows through the fourth pipe 41 to the evaporator 26, where it is subjected to evaporation action, and passes through the fifth pipe 45 to the indoor evaporator. The liquid flows into the container/condenser 23, where it undergoes a condensing action to heat the indoor air, and then passes through the sixth pipe line 47 to the liquid receiving tank 2.
This results in natural circulation within the liquid pump 31, making it possible to stop the operation of the liquid pump 31 during heating.

Therefore, during heating, there is no need for a power source to operate the liquid pump 31, making it possible to significantly reduce heating costs compared to conventional systems.

〔Effect of the invention〕

As described above, according to the present invention, the indoor evaporator/condenser is placed above the liquid receiving tank, and the evaporator is placed below the liquid receiving tank, so that during heating,
The refrigerant in the liquid receiving tank flows into the evaporator through the fourth pipe, where it undergoes an evaporation action, and flows through the fifth pipe into the indoor evaporator/condenser, where it undergoes a condensation action. The receiver heats the indoor air, which is then naturally circulated through the sixth pipe into the liquid receiving tank.Therefore, during heating, the liquid pump has the advantage of being able to stop operating. be.

[Brief explanation of the drawing]

FIG. 1 is a piping system diagram showing an embodiment of the air conditioning system of the present invention. FIG. 2 is a piping system diagram showing the state of FIG. 1 during cooling. FIG. 3 is a piping system diagram showing the state of FIG. 1 during heating. FIG. 4 is a piping system diagram showing a conventional heating and cooling system. [Explanation of symbols of main parts] 21...Liquid receiving tank 23...Room evaporator/condenser 25...Condenser 26...Evaporator 29...First pipe line 31... -Liquid pump 37...Second pipe line 39...Third pipe line 41...Fourth pipe line 45...Fifth pipe line 47...Sixth pipe line.箪 2 cause

Claims (1)

[Claims] (1) A liquid receiving tank that stores a refrigerant that undergoes a gas-liquid phase change in a liquid state, an indoor evaporator/condenser that exchanges heat between the refrigerant and indoor air, and a cooling source that cools the refrigerant and an external cold source. a condenser that exchanges heat during heating; an evaporator that exchanges heat between the refrigerant and an external heat source during heating; and an outlet side of the liquid receiving tank and one side of the indoor evaporator and condenser. a first pipe line in which a liquid pump is interposed, a second pipe line connecting the other side of the room evaporator/condenser and one side of the condenser, and the other side of the condenser and a liquid receiver; No. 3, which connects to the inlet side of the tank.
a fourth pipe line connecting the outlet side of the liquid receiving tank and one side of the evaporator; and a fourth pipe line connecting the other side of the evaporator and the other side of the room evaporator/condenser. a fifth pipe line, and a sixth pipe line connecting one side of the room evaporator/condenser and the inlet side of the liquid receiving tank, the room evaporator being connected to the liquid receiving tank at a position above the liquid receiving tank. 1. An air-conditioning and heating system characterized in that a double-condenser is disposed, and the evaporator is disposed below a liquid receiving tank.