JPH0462343A - Cooling and heating device - Google Patents

Abstract

PURPOSE:To reduce largely cooling cost by arranging a room vaporizer/ condenser downward of a liquid receiving tank and providing a bypass pipe which bypasses a liquid pump of a first pipe and into which a valve is interposed. CONSTITUTION:In a cooling and heating device, at a time of cooling, a cold source consisting of, for example, cold water is supplied to a cold/hot heat source supplying pipe 27 of a condenser/vaporizer 25, a valve 57 of a bypass pipe 59 is opened and a liquid pump 31 is stopped. Refrigerant in a liquid receiving tank 21, due to an arrangement of a room vaporizer/condesner 23 downward of the liquid receiving tank 21, flows under natural conditions through a first pipe 29 and the bypass pipe 59 into the room vaporizer/condenser 23, where it is vaporized to cool air in a room, and after that flows through a second pipe 37 into the vaporizer/condenser 25, where it is condensed, and then, circulates through a third pipe 39 into the liquid receiving tank 21. On the other hand, at a time of heating, hot liquid consisting of, for example, hot water is supplied to the cold/hot heat source supplying pipe 27 of the condenser /vaporizer 25, the valve 57 of the bypass pipe 59 is closed and the liquid pump is operated.

Description

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

[Prior Art] Conventionally, a heating and cooling system for both summer and winter using a refrigerant that changes gas-liquid phase, such as a fluorocarbon-based refrigerant, is disclosed in, for example, Japanese Patent Laid-Open No. 2-57835, which was previously filed by the present applicant. What is done is 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.

[Problems to be Solved by the Invention] However, in such a conventional air conditioning system, it is necessary to constantly operate the liquid pump 17 and circulate the refrigerant during both cooling and heating, and the operation of the liquid pump 17 requires a lot of effort. The problem was that a large amount of electrical energy was required.

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 cooling.

[Means for Solving the Problems] A heating and cooling device according to the present invention includes a liquid receiving tank that stores a refrigerant that undergoes a gas-liquid phase change in a liquid state, and an indoor evaporator and condenser that exchanges heat between the refrigerant and indoor air. a condenser/evaporator that exchanges heat with the refrigerant and an external cooling and heat source;
a first pipe line connecting the outlet side of the liquid receiving tank and one side of the indoor evaporator/condenser and having a liquid pump interposed therein; a second pipe line connecting one side of the condenser/evaporator and a third pipe line connecting the other side of the condenser/evaporator and the inlet side of the liquid receiving tank; and an outlet side of the liquid receiving tank. and the other side of the condenser/evaporator via the liquid pump; and a fourth pipe line connecting one side of the indoor evaporator/condenser and the inlet side of the liquid receiving tank. 5
In the air-conditioning device equipped with a pipe line, the indoor evaporator and condenser is disposed below the liquid receiving tank, and
By bypassing the liquid pump of the first pipeline, a bypass pipeline is provided in which an on-off valve is interposed.

[Function] In the present invention, during cooling, the on-off valve of the bypass pipe is opened, the liquid pump is stopped, and the refrigerant in the liquid receiving tank is transferred to the indoor evaporator/condenser below the liquid receiving tank. Because the air is placed in It flows through the channel into the evaporator and condenser, where it is subjected to condensation action, and then,
The liquid is circulated through the third pipe line into the liquid receiving tank.

On the other hand, during heating, the on-off valve of the bypass pipeline is closed.
The liquid pump is activated, and the refrigerant in the liquid receiving tank flows into the condenser/evaporator through the fourth pipe, where it undergoes evaporation, and then passes through the second pipe into the indoor evaporator/condenser. The air enters the room, where it undergoes a condensing action and heats the air inside the room.
The liquid is circulated through the pipe into the receiving tank.

[Example] Hereinafter, an example will be described in which details of the present invention are 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 and condensers that exchange heat between the refrigerant and indoor air.

Reference numeral 25 indicates a condenser/evaporator that exchanges heat with the refrigerant and an external cooling/heat source.
A cold/heat source supply pipe 27 for supplying a cold/heat source from the outside is inserted through the pipe 5 .

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/evaporator 25.

Furthermore, - the other side of the condenser/evaporator 25 and the liquid receiving tank 21
A third conduit 39 is formed by connecting the inlet side of the
An on-off valve 41 is arranged in this third conduit 39 .

A fourth pipe line 43 is arranged which branches from between the liquid pump 31 and the on-off valve 33 of the first pipe line 29 and connects to the other side of the condenser/evaporator 25. An on-off valve 45 is arranged.

Further, a fifth 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 210
A pipe line 47 is arranged, and an on-off valve 49 is arranged in this fifth pipe line 47.

In addition, a control valve 53 whose opening degree is controlled by a signal from a pressure sensor 51 disposed in the second pipe line 37 is arranged in the cold and heat source supply pipe 27. The condensation or vaporization of the refrigerant in the container/evaporator 25 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 55 disposed indoors.

In this embodiment, the indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21 by a height H.

Further, a bypass pipe 59 is arranged to bypass the liquid pump 31 of the first pipe 29 and include an on-off valve 57 .

In the air-conditioning system configured as described above, as shown in FIG. 2, during cooling, a cold source 8 made of, for example, cold water is supplied to the cold/hot source supply pipe 27 of the condenser/evaporator 25. The on-off valve 57 of the bypass line 59 is opened and the liquid pump 31 is stopped.

Since the indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21, the refrigerant in the liquid receiving tank 21 passes through the first pipe line 29 and the bypass pipe 59 to the indoor evaporator/condenser 23. The air flows into the condenser 23 in a natural circulation state, where it undergoes an evaporative action, cools the indoor air, and flows through the second pipe line 37 into the evaporator/condenser 25, where it undergoes a condensing action. ,
Thereafter, the liquid is circulated through the third 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.
is closed and the liquid pump 31 is activated.

Then, the refrigerant in the liquid receiving tank 21 flows into the condenser/evaporator 25 through the fourth pipe line 43, undergoes an evaporation action here, and passes through the second pipe line 37 into the indoor evaporator/condenser. The liquid flows into the liquid receiving tank 23, where the liquid receives a condensing action and heats the indoor air, and then circulates into the liquid receiving tank 21 through the fifth pipe line 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 indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21, the liquid pump 31 of the first pipe line 29 is bypassed, and the on-off valve is Since the bypass pipe 59 in which the bypass pipe 57 is interposed is provided, during cooling, by opening the on-off valve 57 of the bypass pipe 59, the refrigerant in the liquid receiving tank 21 is transferred to the first pipe 29 and the bypass pipe. 59 and into the room evaporator/condenser 23 in a natural circulation state, it is possible to stop the operation of the liquid pump 31 during cooling.

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

〔Effect of the invention〕

As described above, according to the present invention, the indoor evaporator/condenser is disposed below the liquid receiving tank, the liquid pump in the first pipeline is bypassed, and the bypass valve is installed. Since the pipe is 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 is naturally circulated to the indoor evaporator/condenser. Since the liquid flows in at a constant 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 a conventional heating and cooling system. (Explanation of symbols of main parts) 21...Liquid receiving tank Fig. 1 Room evaporator/condenser Condenser/evaporator 1st pipe Liquid pump 2nd pipe 3rd pipe 4th pipe 5 pipeline on-off valve bypass pipeline.

Claims (1)

[Claims] (1) A liquid receiving tank that stores a refrigerant that changes gas-liquid phase in a liquid state, an indoor evaporator/condenser that exchanges heat between the refrigerant and indoor air, and a source of cooling and heat from the outside that connects the refrigerant with the indoor air. a condenser and evaporator for heat exchange; a first pipe line connecting the outlet side of the liquid receiving tank and one side of the room evaporator and condenser and having a liquid pump interposed therein; a second pipe connecting the other side of the condenser/condenser and one side of the condenser/evaporator; and a third pipe connecting the other side of the condenser/evaporator and the inlet side of the liquid receiving tank. a fourth channel connecting the outlet side of the liquid receiving tank and the other side of the condenser/evaporator via the liquid pump;
In the heating and cooling apparatus, the heating and cooling apparatus includes a pipe line and a fifth pipe line connecting one side of the indoor evaporator/condenser and an inlet side of the liquid receiving tank, wherein the indoor evaporator/condenser is connected to the receiver. 1. An air-conditioning and heating system, characterized in that a bypass pipe is provided below the liquid tank, bypassing the liquid pump in the first pipe, and having an on-off valve interposed therein.