JPH02103347A - Cooling and heating apparatus - Google Patents

Abstract

PURPOSE:To sufficiently exhibit the ability of a first auxiliary heat exchanger while preventing a refrigerant liquid from flowing backward into a compressor, and to make a supercooling degree larger to enhance the ability of a heat source side refrigerant cycle by providing a third auxiliary heat exchanger in the heat source side refrigerant cycle and by exchanging heat between the outlet side refrigerant of a heat source side heat exchanger and the outlet side refrigerant of the first auxiliary heat exchanger during a cooling operation. CONSTITUTION:A third auxiliary heat exchanger 13 carries out heat-exchanging between the outlet side refrigerant of a heat source side heat exchanger 3 and the outlet side refrigerant to a first auxiliary heat exchanger 8 and is arranged so as to be actuated by means of a solenoid valve 14 in a cooling operation. The solenoid valve 14 is opened during the cooling operation, and the outlet side refrigerant of the heat source side heat exchanger 3 and the outlet side refrigerant of the first auxiliary heat exchanger 8 exchange heat with each other in the third auxiliary heat exchanger 13. Accordingly, even if the outlet side refrigerant of the first auxiliary heat exchanger is brought into a two-phase state by making the opening degree of a cooling decompressor larger in order to permit the first auxiliary heat exchanger to sufficiently exhibit its ability, the refrigerant liquid is prevented from flowing backward into a compressor and the supercooling degree can be made larger. Therefore, the ability of a heat source side refrigerant cycle can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a refrigerant cycle for a heating and cooling system.

BACKGROUND OF THE INVENTION Conventionally, the refrigerant cycle of an air-conditioning system is divided into a heat source-side refrigerant cycle and a user-side refrigerant cycle, as shown in FIG. In Fig. 2, 1 is a compressor, 2 is a four-way valve on the heat source side, 3 is a heat exchanger on the heat source side, 4 is a cooling pressure reducing device, 5 is a heating pressure reducing device, and 6 is a cooling pressure reducing device 4 that is closed during heating. 7 is a check valve that closes the pressure reducing device 6 for heating during cooling, and 8 is a first auxiliary heat exchanger, which are connected in an annular manner to form a heat source side refrigerant cycle. A second auxiliary heat exchanger 9 is integrally formed to exchange heat with the first auxiliary heat exchanger 8. 10 is a refrigerant amount adjustment tank that adjusts the amount of refrigerant during cooling and heating. Reference numeral 11 denotes a refrigerant conveying device which has a reversible characteristic such that the outflow direction of the refrigerant is opposite during cooling and heating, and is housed in the heat source side cabinet (a).

Reference numeral 12 denotes a heat exchanger on the user side, which is housed in the user side unit b and is connected to the heat source side unit a through connection pipes c and c'.

The second auxiliary heat exchanger 9 and the refrigerant amount adjustment tank 10° refrigerant conveying device 11. Usage side heat exchanger 12 and connection piping a
, c' are connected in an annular manner to form a user-side refrigerant cycle.

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

During cooling operation, the refrigerant cycle is indicated by the solid arrow in the figure. In the heat source side refrigerant cycle, high temperature, high pressure gas from the compressor 1 passes through the four-way valve 2, radiates heat in the heat source side heat exchanger 3, condenses and liquefies, and passes through the check valve 6. The air is depressurized by the cooling expansion valve 4, evaporated by the first auxiliary heat exchanger 8, and circulated to the compressor 1 through the heat source side four-way valve 2. At this time, the second auxiliary heat exchanger 9 of the refrigerant cycle on the user side
The first auxiliary heat exchanger 8 exchanges heat, and the gas refrigerant in the user-side refrigerant cycle is cooled and liquefied, and is sent to the refrigerant conveyance device 11 through the refrigerant amount adjustment tank 1o. It is sent to the user-side heat exchanger 12 through the connecting pipe C, where it is cooled, endothermically evaporated, gasified, and circulated through the connecting pipe C' to the second auxiliary heat exchanger 9.

On the other hand, during heating operation, the refrigerant cycle shown by the broken line arrow in the figure is υ, and in the heat source side refrigerant cycle, the high temperature and high pressure refrigerant from the compressor 1 is transferred from the heat source side four-way valve 2 to the first auxiliary heat exchanger 8.
It radiates heat, condenses and liquefies, reduces the pressure through the check valve 7 with the heating pressure reducing device 6, absorbs heat and evaporates in the heat source side heat exchanger 3, and circulates through the heat source side four-way valve 2 to the compressor 1. At this time, the second auxiliary heat exchanger 9 of the user-side refrigerant cycle and the first auxiliary heat exchanger 8 exchange heat, and the liquid refrigerant in the user-side refrigerant cycle is heated and gasified, passing through the connecting pipe C'. The refrigerant is sent to the user side heat exchanger 12, heated and liquefied with heat radiation, and sent to the refrigerant conveying device 11 through the connection pipe C, and circulated from the refrigerant amount adjustment tank 10 to the second auxiliary heat exchanger 9.

Problems to be Solved by the Invention However, in the above configuration, in order to fully utilize the ability of the first auxiliary heat exchanger 8, it is necessary to bring the outlet refrigerant of this heat exchanger into a two-phase state to increase the heat transfer coefficient. need to,
The opening degree of the cooling pressure reducing device 4 will be slightly increased.

Therefore, there is a problem in that the capacity of the refrigerant cycle on the heat source side decreases because the liquid back up to the compressor 1 and the degree of supercooling decrease.

In view of the above-mentioned problems, the present invention provides an air-conditioning system that can fully utilize the ability of the first auxiliary heat exchanger while preventing liquid backflow to the compressor, increase the degree of subcooling, and improve the ability of the heat source side refrigerant cycle. It is something to do.

Means for Solving the Problems In order to solve the above problems, the air conditioning system of the present invention includes a third auxiliary heat exchanger in the heat source side refrigerant cycle, and during cooling, the outlet side refrigerant of the heat source side heat exchanger and the first It exchanges heat with the refrigerant on the outlet side of the auxiliary heat exchanger.

Effects of the Invention With the above-described configuration, the present invention can increase the degree of subcooling of the heat source side refrigerant cycle even if the opening degree of the cooling expansion valve is increased, and can prevent liquid backflow to the compressor.

EXAMPLE Hereinafter, a heating and cooling system according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a refrigerant cycle of a heating and cooling system according to an embodiment of the present invention. In FIG. 1, a third auxiliary heat exchanger 13 exchanges heat between the refrigerant on the outlet side of the heat source side heat exchanger 3 and the refrigerant on the outlet side of the first auxiliary heat exchanger 8. When it's working. The rest is the same as the conventional example, and the same reference numerals are used here to omit the explanation. The operation of this refrigerant cycle is also the same as that of the conventional example, and the details are omitted. During cooling operation, the solenoid valve 14 opens and the refrigerant on the outlet side of the heat source side heat exchanger 3 is exchanged with the third auxiliary heat exchanger 13. The refrigerant on the outlet side of the first auxiliary heat exchanger 8 exchanges heat.

As described above, according to this embodiment, in order to fully utilize the capacity of the first auxiliary heat exchanger, the opening degree of the cooling pressure reducing device is increased to bring the refrigerant at the outlet side of this heat exchanger into a two-phase state. Also, since liquid backflow to the compressor can be prevented and the degree of subcooling can be increased, the capacity of the heat source side refrigerant cycle can be improved.

Effects of the Invention As described above, the present invention provides a third auxiliary heat exchanger in the heat source side cycle, and exchanges heat between the outlet side refrigerant of the heat source side heat exchanger and the outlet side refrigerant of the first auxiliary heat exchanger during cooling. In order to make full use of the capacity of the first auxiliary heat exchanger,
Even if the opening degree of the air-conditioning pressure reducing device is increased and the refrigerant on the outlet side of the first auxiliary heat exchanger is in a two-phase state, it is possible to prevent liquid packs into the compressor and increase the degree of superrefrigeration. This has the effect of improving the capacity of the side refrigerant cycle.

[Brief explanation of drawings]

FIG. 1 is a refrigerant cycle diagram of a heating and cooling system according to an embodiment of the present invention, and FIG. 2 is a diagram of a refrigerant cycle of a conventional heating and cooling system. 3... Heat source side heat exchanger, 8... First auxiliary heat exchanger, 9... Second auxiliary heat exchanger, 11...
. . . Refrigerant conveyance device, 12 . . . User-side heat exchanger, 13 . . . Third auxiliary heat exchanger.

Claims (1)

[Claims] A heat source side refrigerant cycle is formed by connecting a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger in an annular manner, and this first auxiliary heat exchanger is integrally formed. A user-side refrigerant cycle includes a second auxiliary heat exchanger to be exchanged, a refrigerant conveying device, and a user-side heat exchanger connected in an annular manner. An air-conditioning/heating device characterized by being provided with a third auxiliary heat exchanger for exchanging heat with the refrigerant on the outlet side of the air conditioner.