JPS6158745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a direct-fired absorption refrigerator capable of producing cold water for cooling or hot water for heating by burning gas or kerosene, a reciprocating compressor driven by an electric motor,
The present invention relates to a heating and cooling system in which a pressurized refrigerator having a screw compressor or the like as a component of the refrigeration cycle is combined through heat medium piping.

Conventionally, various types of refrigerators that can be used for both cooling and heating have been put into practical use. for example,
A pressurized refrigerator drives a reciprocating compressor or screw compressor with an electric motor to pressurize a refrigerant such as Freon, and uses the latent heat of condensation of this refrigerant for heating and the latent heat of vaporization for cooling. While the temperature can be any low temperature below 0℃, the temperature during heating is 45℃.
The practical limit temperature is ~50℃. On the other hand, the absorption liquid and refrigerant are separated by heating by burning gas or kerosene.
Absorption refrigerators use the latent heat of vaporization of the refrigerant for cooling, and the absorption liquid or the sensible heat and latent heat of the cooling for heating. The practical limit temperature is 6°C.

For this reason, Japanese Patent Application Laid-Open No. 51-3039 proposes a system that combines an absorption refrigerator and a compression refrigerator to obtain a sufficiently low temperature heat medium during cooling, but the temperature is too low during heating. The problem was that it was not possible to obtain a high heat medium.

Furthermore, Japanese Patent Application Laid-Open No. 53-43266 discloses that high-temperature hot water can be extracted from the absorber of an absorption heat pump by evaporating the water in the evaporator of the absorption heat pump at the discharge temperature of the compressor of the compression heat pump. Japanese Unexamined Patent Publication No. 48-2428 discloses a system in which low-temperature cold water is obtained from the evaporator of a screw compressor by cooling the condenser of the screw compressor with cooling water cooled by an absorption refrigerator. However, in both of these methods, one of the refrigerators is used as a heat source for the other refrigerator, so there is a problem that the heat exchange efficiency decreases due to the heat exchange between the heat medium of both refrigerators. Ta.

In view of this problem, the present invention transfers the heat medium of the temperature controller installed in the room to be cooled or heated from the condenser of the pressure refrigerator to the heat medium heating device of the absorption refrigerator during heating, and from the absorption refrigerator during cooling. By switching the flow from the evaporator to the evaporator of the pressurized refrigerator using a switching valve, it is possible to efficiently generate a sufficiently high temperature heat medium during heating and a sufficiently low temperature heat medium during cooling. The present invention provides an air-conditioning device that improves the build-up coefficient.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is the reciprocating compressor described earlier;
2 is a direct-fired absorption refrigerator that can generate cold water and hot water; 3 is a temperature controller installed in the room to be cooled or heated; 4 is a pressure refrigerator with a screw compressor as a component of the refrigeration cycle; heat medium circulation pump,
5 and 5' are switching valves, and these devices are connected to the heat exchange section (condenser or evaporator, etc.) 6 of the pressure refrigerator and the heat exchange section (heat medium heating device, evaporator, etc.) of the absorption refrigerator. 7 is connected by a heat medium pipe 8.

In addition, 9 indicates the absorption refrigerator 2 and the pressure refrigerator 1,
This is an auxiliary pipe that is thermally connected as required, as will be described later.

When the air-conditioning device of the present invention having such a configuration is used for cooling, the heat medium is circulated by the pump 4 as shown by the solid line arrow in the figure, and the heat pre-cooled in the heat exchange section 7 of the absorption refrigerator is transferred. The medium is a heat exchange section 6 of a pressurized refrigerator.
The air flows into the air conditioner, is cooled to a temperature sufficient for air conditioning, and is supplied to the temperature controller 3. During this operation, another fluid pre-cooled in the heat exchange section 7 of the absorption refrigerator is supplied to the auxiliary pipe 9.
After cooling the condenser of the pressurized refrigerator 6, the heat of the fluid whose temperature has risen due to this cooling is recovered by the absorption refrigerator 2, thereby further improving the build-up coefficient. In this way, the heating medium is cooled to a low temperature sufficient for air conditioning (for example, -2°C to -4°C), and air conditioning is performed.

In this case, in the pressurized refrigerator, the difference between the condensing pressure and the evaporating pressure becomes smaller, and a higher coefficient of performance can be obtained than when operating alone.

On the other hand, when the device of the present invention is used for heating, the switching valves 5 and 5' are switched as shown by the broken line, and the heat medium is circulated by the pump 4 shown by the broken line. A heating medium heated to a high temperature (70° C. or higher) that cannot be obtained with the pressure refrigerator is supplied to the temperature controller 3. At the same time during this operation, another fluid heated in the heat exchange section 6 of the pressure refrigerator was used to heat the evaporator of the absorption refrigerator 2 via the auxiliary pipe 9, and the temperature conversely decreased due to this heating. If the heat of the fluid is recovered by the pressurized refrigerator 1, the build-up coefficient will be further improved.

In this case, the heating temperature of the heat medium in the pressurized refrigerator 1 only needs to be small, and there is no need to enlarge the shape of the heat exchange part or to extremely increase the degree of pressurization of the refrigerant, as in the case of the conventional method. It is possible to operate with a higher coefficient of performance than when driving.

Furthermore, in the air conditioning system of the present invention, the temperature difference between the temperature of the room being cooled and heated and the temperature controller can be increased both during cooling and heating, so the heat exchanger is small and compact. This temperature controller also has the same heating and cooling functions as conventional ones, and has the effect of reducing heating and cooling operation costs as well as equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a piping configuration diagram showing one embodiment of the air conditioning system according to the present invention, and FIG. 2 is a piping configuration diagram showing another embodiment. 1 - Pressure refrigerator, 2 - Direct-fire absorption refrigerator, 3
~ Temperature controller, 8 ~ Heat medium piping.

Claims (1)

[Claims] 1. Pressurized refrigeration, in which a refrigeration cycle is composed of a compressor such as a reciprocating compressor or screw compressor, a condenser, and an evaporator, and the condenser heats the heat medium during heating, and the evaporator cools the heat medium during cooling. There are two types of absorption refrigerators: absorption refrigerators, which form a refrigeration cycle with a heating medium heating device, a heating medium heating device, and an evaporator, and heat the heating medium with the heating medium heating device during heating, and cool the heating medium with an evaporator during cooling, and pressure refrigerators. The condenser, the evaporator, the heat medium heating device of the absorption chiller, and the evaporator are connected to the heat medium piping and installed in the room to be cooled and heated. The condenser of the compression refrigerator, the heat medium heating device of the absorption refrigerator, and the temperature controller are sequentially connected in an annular manner to form a heating circuit, and the evaporator of the absorption refrigerator and the pressure An air-conditioning/heating device characterized by being provided with a switching valve that sequentially connects an evaporator and a temperature controller in an annular manner to form a cooling circuit.