JPH0476331A - Cooling and heating device - Google Patents

Abstract

PURPOSE:To provide a smooth circulation of refrigerant and perform a positive circulation of refrigerant with a relatively small-sized liquid pump by a method wherein a condensor for cooling refrigerant in the sixth pipe line is disposed at a position above a liquid accepting tank in the sixth pipe line. CONSTITUTION:When a cooling operation is carried out, a cooling source such as cold water is supplied to a cooling source supplying pipe 27 of a condensor 25 and then a liquid pump 31 is operated. Refrigerant within a liquid accepting tank 21 passes through the first pipe passage 29, flows into an indoor evaporator and condensor 23, where it receives an evaporating action so as to cool air in the indoor area. The air passes through the second pipe line 37 and flows into the condensor 25, where it receives a condensing action, thereafter it passes through the third pipe line 39 and is circulated within the liquid accepting tank 21. In turn, when a heating operation is carried out, hot source such as hot water is supplied to a temperature source also acting as supplying pipe 28 for the evaporator 26 and then the liquid pump 31 is operated. Then, refrigerant within the liquid accepting tank 21 passes through the fourth pipe line 41, flows into the evaporator 26, where it receives an evaporating action, it is gasified, it passes through the fifth pipe line 45, flows into the indoor evaporator also acting as a condensor 23, it receives a condensing action to heat indoor air and thereafter it passes through the sixth pipe line 47 and circulates in the liquid accepting tank 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] 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.

[Conventional technology]

BACKGROUND ART Conventionally, as a heating and cooling apparatus using a refrigerant that undergoes a gas-liquid phase change, such as a fluorocarbon-based refrigerant, there is known, for example, the one disclosed in Japanese Patent Laid-Open No. 2-57835, which was previously filed by the present applicant.

FIG. 7 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 I7 that performs a heat cycle by these, and further , 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.

In this air-conditioning system, during heating, the liquid pump 1
7 is activated, the refrigerant in the liquid receiving tank 11 flows into the condenser/evaporator 13 through the first pipe line 18, as shown by the bold line in the figure, where it is subjected to evaporation action, and then transferred to the second pipe line. The liquid flows into the indoor evaporator/condenser 15 through 19, where it undergoes a condensing action to heat the indoor air, and then circulates into the liquid receiving tank 11 through the sixth pipe line 20. .

[Problem to be solved by the invention]

However, in such conventional heating and cooling systems, the refrigerant is forced to circulate through the operation of the liquid pump 17.
Relatively large liquid pump 17 with sufficient forced circulation capacity
The problem was that it required

In particular, an indoor evaporator/condenser 15 is installed below the liquid receiving tank 17.
is arranged, or the resistance of each pipe line 18, 19, 20 is large, and when heating using the sixth pipe line 20,
There were times when the actual head became so large that it became difficult to perform sufficient forced circulation.

The present invention solves the above-mentioned problems, and aims to provide a heating and cooling device that can reliably circulate a refrigerant using a relatively small liquid pump.

[Means to solve the problem]

A heating and cooling device according to a first aspect of 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/condenser that exchanges heat between the refrigerant and indoor air; An example of 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 the room evaporator/condenser. a first pipe line that connects the other side of the room evaporator/condenser and the example of the condenser, and a second pipe line that connects the other side of the room evaporator/condenser and the other side of the condenser; and an inlet side of the liquid receiving tank, a fourth pipe line connecting the outlet side of the liquid receiving tank and the example of the evaporator, and the other side of the evaporator and the chamber side. a fifth pipe line connecting the other side of the evaporator/condenser; and a sixth pipe line connecting one side of the indoor evaporator/condenser and the inlet side of the liquid receiving tank; 6th
A liquid condenser for cooling the refrigerant in the sixth pipe is disposed at a position above the liquid receiving tank in the pipe.

The air conditioning system according to claim 2 is the air conditioning system according to claim 1, in which the indoor evaporator and condenser is disposed below the liquid receiving tank, the liquid pump in the first pipe is bypassed, and an on-off valve is provided. The system is equipped with a bypass pipe.

[For production]

In the invention of claim 1, during cooling, the refrigerant in the liquid receiving tank flows into the indoor evaporator/condenser through the first pipe, where it receives the evaporation action and cools the indoor air. , flows through a second line into a condenser where it is subjected to a condensing action, and then circulates through a third line into a receiving tank.

On the other hand, during heating, the refrigerant in the liquid receiving tank flows into the evaporator through the fourth pipe, receives the evaporation effect there, and flows into the indoor evaporator/condenser through the fifth pipe, Here, the condensing action heats the indoor air, which is then circulated into the liquid receiving tank through the sixth pipe.

In the invention of claim 1, since the condenser for cooling the refrigerant in the sixth pipe is disposed above the liquid receiving tank in the sixth pipe, the gas in the sixth pipe is is recondensed in the condenser, the internal pressure in the condenser and the liquid receiving tank is reduced, and as a result, the refrigerant in the sixth pipe line is drawn toward the condenser.

In the air conditioning system according to claim 2, in claim 1, the indoor evaporator/condenser is disposed below the liquid receiving tank, the liquid pump in the first pipe is bypassed, and an on-off valve is interposed. Since a bypass pipe is provided, when cooling the air conditioner, by opening the on-off valve of the bypass pipe, the refrigerant in the liquid receiving tank can be transferred to the 11th! It will surely flow into the room evaporator/condenser in a natural circulation state through the pipe 1 and the bypass pipe.

〔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 an example of the indoor evaporator/condenser 23. , 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 an example 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 21.

A fourth pipe line 41 is formed by connecting the outlet side of the liquid receiving tank 21 and an example 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 51 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 for measuring the differential pressure before and after the liquid pump 31 is disposed in the first conduit 29, and a liquid level sensor 63 is disposed in the fourth conduit 41. Is the operation of the liquid pump 31 controlled by the surface sensor 63? 11.

In this embodiment, the liquid receiving tank 2 of the sixth pipe line 47
A condenser 65 that cools the refrigerant in the sixth pipe line 47 is disposed above the sixth pipe line 47 .

This condenser 65 has a cold water supply pipe 67 that supplies cold water.
A control valve 71 whose opening degree is controlled by a signal from a pressure sensor 69 disposed in the liquid receiving tank 21 is disposed in the cold water supply pipe 67 .

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 operated.

Then, the refrigerant in the liquid receiving tank 21 flows into the evaporator 26 through the fourth pipe line 41, where it is gasified by the evaporation action, and passes through the fifth pipe line 45 into the indoor evaporator and condenser. The liquid flows into the container 23 where it is condensed to heat the indoor air, and then circulates into the liquid receiving tank 21 through the sixth pipe 47.

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 sixth conduit 47 is located above the liquid receiving tank 21.
Since the condenser 65 that cools the refrigerant in the pipe line 47 is arranged, during heating, the gas in the sixth pipe line 47 is recondensed in the condenser 65, and the condenser 65 and liquid receiving tank 21 are recondensed. As a result, the refrigerant in the sixth pipe line 47 is drawn toward the condenser 65 side.

Therefore, the fourth conduit 41. Fifth conduit 45 and sixth conduit 4
The circulation of the refrigerant in 7 becomes very smooth, and it becomes possible to reliably circulate the refrigerant using the relatively small liquid pump 31.

In particular, when the indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21, or when each pipe line 41,
Even when the resistance of 45.47 is large, sufficient forced circulation can be easily achieved.

Furthermore, since it is possible to reduce the capacity of the liquid pump 31, it is possible to reduce manufacturing costs and power consumption costs.

Furthermore, in the air conditioning system configured as described above, the condenser 65 only needs to re-condense the gas that has been depressurized and flashed within the sixth pipe line 47, for example.
5, it is possible to use a relatively simple device with a small capacity.

FIG. 4 shows another embodiment of the air conditioning system of the present invention. In this embodiment, the indoor evaporator/condenser 23 is located below the liquid receiving tank 21, and Bypassing the liquid pump 31 of the first conduit 29, a bypass conduit 75 is provided in which an on-off valve 73 is interposed.

In the air-conditioning system configured as above, during cooling,
As shown in FIG. 5, the on-off valve 73 of the bypass line 75 is opened, the liquid pump 31 is stopped, and the refrigerant in the liquid receiving tank 21 is transferred from the liquid receiving tank 21 to the indoor evaporator/condenser 23.
Since it is located at the bottom, it flows through the first pipe line 29 and the bypass pipe line 75 into the indoor evaporator/condenser 23 in a natural circulation state, where it receives the evaporation action and cools the indoor air. The liquid then flows into the condenser 25 through the second pipe line 37, where it is subjected to a condensing action, and then circulates into the receiving tank 21 through the third pipe line 39.

On the other hand, during heating, as shown in FIG. 6, the on-off valve 73 of the bypass line 75 is closed, the liquid pump 31 is operated, and the refrigerant in the liquid receiving tank 21 passes through the fourth line 41 and evaporates. It flows into the vessel 26, where it is subjected to evaporation action, and then flows into the fifth pipe line 45.
The air flows through the indoor evaporator/condenser 23, where it receives a condensing action and heats the indoor air, and then flows into the sixth pipe 4.
7 and is subjected to a condensing action in a condenser 65, after which it is circulated into the liquid receiving tank 21.

Although the air-conditioning system configured as described above can achieve almost the same effect as the embodiment shown in FIG. 1,
In this embodiment, the indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21, and the liquid pump 31 of the first pipe line 29 is bypassed to form a bypass pipe in which an on-off valve 73 is interposed. 75, during cooling, by opening the on-off valve 73 of the bypass pipe 75, the liquid receiving tank 2 can be opened.
Since the refrigerant in 1 reliably flows into the indoor evaporator/condenser 23 through the first pipe line 29 and the bypass pipe line 75 in a natural circulation state, the operation of the liquid pump 31 can be stopped during cooling. .

〔Effect of the invention〕

As described above, according to the air conditioning system of claim 1, since the condenser for cooling the refrigerant in the sixth pipe line is disposed above the liquid receiving tank of the sixth pipe line, The gas in the 6th pipeline is recondensed in the condenser, the internal pressure in the condenser and the liquid receiving tank is reduced, and the refrigerant in the 6th pipeline is drawn toward the condenser. Therefore, the circulation of the refrigerant in each pipe line and the sixth pipe line becomes very smooth, and there is an advantage that the refrigerant can be reliably circulated using a relatively small liquid pump.

In the air conditioning system according to claim 2, in claim 1, the indoor evaporator/condenser is disposed below the liquid receiving tank, the liquid pump in the first pipe is bypassed, and an on-off valve is interposed. Since a bypass pipe has been installed, during cooling, by opening the on-off valve of the bypass pipe, the refrigerant in the liquid receiving tank passes through the first pipe and the bypass pipe and naturally enters the indoor evaporator/condenser. Since the liquid flows in in a circulating state, there is an advantage that the operation of the liquid pump can be stopped during cooling.

[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 another embodiment of the air conditioning system of the present invention. FIG. 5 is a piping system diagram showing the state of FIG. 4 during cooling. FIG. 6 is a piping system diagram showing the state of FIG. 4 during heating. FIG. 7 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 65...Liquid condenser . Figure Figure Figure Figure

Claims (2)

[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 indoor evaporator/condenser and the inlet side of the liquid receiving tank, the sixth pipe line connecting an upper side of the liquid receiving tank A heating and cooling device characterized in that a condenser for cooling the refrigerant in the sixth pipe line is disposed at a position where the condenser cools the refrigerant in the sixth pipe. (2) The indoor evaporator/condenser is placed below the liquid receiving tank, and the liquid pump in the first pipeline is bypassed.
2. The heating and cooling system according to claim 1, further comprising a bypass pipe line in which an on-off valve is interposed.