JPH0138232B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat recovery type heat pump device that has a high coefficient of performance (cooling coefficient/compressor input) and can perform cooling and heating simultaneously.

A conventional device of this type is shown in FIG. As shown in the figure, two condensers were connected in parallel to provide cooling and heating at the same time.

In the figure, 1 is an evaporator, 2 is a compressor, 3 is a first condenser, 4 is a heating hot water coil, 5 is a hot water pipe, 6 is a second condenser, 7 is a cooling tower, 8 is a cooling water pipe, 9 is an expansion valve, 10 is a cold water coil for cooling, 11
12 indicates a cold water pipe, and 12 indicates a refrigerant pipe.

One of the two condensers, for example the first condenser 3
In order to use it for heating, it is necessary to extract high-temperature thermal energy from the first condenser 3, so the condensation temperature must be made high. In this case, it is necessary to control the amount of heat released so that the condensation temperature in the two condensers is equalized in the condenser that releases excess heat outdoors when the outside temperature is low.

Also, because the condensation temperature was high, the coefficient of performance was low.

In order to eliminate the conventional drawbacks, the present invention connects a first condenser, a gas-liquid separator, an ejector, and a second condenser in series, and connects the evaporator and ejector with piping, so that the first condenser is connected to the first condenser. The exiting gas-liquid mixed refrigerant is separated into a gas-phase refrigerant and a liquid-phase refrigerant in the gas-liquid separator, and the separated liquid-phase refrigerant is returned to the evaporator through an expansion valve, while the separated gas-phase refrigerant The refrigerant is injected by the ejector and a part of the refrigerant going to the compressor from the evaporator is sucked and guided to the second condenser, and the refrigerant coming out of the second condenser is returned to the evaporator through an expansion valve. When the outside temperature is low, the high-temperature heating energy of the refrigerant is extracted and, at the same time, uncontrolled condensation is performed using the low-temperature outside air, resulting in simultaneous heating and cooling operation that maintains a high coefficient of performance.

The present invention will be explained based on the drawings.

FIG. 2 shows a configuration diagram of the heat recovery type heat pump device of the present invention, and FIG. 3 shows a state change diagram of the refrigerant in the device of the present invention.

In the figure, the same symbols as in FIG. 1 indicate the same parts.

In the figure, 13 is a gas-liquid separator, 14 is a supersonic ejector, and 15 is an expansion valve.

The present invention differs from conventional devices in that the first and second condensers are used in series, and a gas-liquid separator and a supersonic ejector are connected by piping in series between them. In order to make the gas-liquid separator and supersonic ejector function,
The refrigerant piping of the evaporator 1 and the compressor 2 are branched and connected to a supersonic ejector 14, while the gas-liquid separator 13 is connected to the evaporator 1 through an expansion valve 15.

The second condenser 6 is conventionally connected to the evaporator 1 via an expansion valve 9. FIG. 3 shows the state changes of the refrigerant in the apparatus of the present invention on a Mollier diagram.

The operation of the device of the present invention will be explained.

A portion of the low-pressure dry saturated vapor refrigerant (FIG. 3A) discharged from the evaporator 1 is sent to the compressor 2. The refrigerant is polytropically compressed in the compressor 2 and becomes a high-pressure superheated vapor (FIG. 3B). This refrigerant is transferred to the first condenser 3
The refrigerant is cooled by the return hot water from the heating hot water coil 4 and becomes a high-pressure wet vapor refrigerant. The hot water discharged from the first condenser 3 reaches a sufficiently high temperature for heating and is sent to the heating hot water coil 4. 1st
The high-pressure wet vapor refrigerant leaving the condenser 3 enters the gas-liquid separator 13 and is separated into a high-pressure liquid refrigerant (FIG. 3C) and a high-pressure dry saturated vapor refrigerant (FIG. 3D). This high-pressure dry saturated vapor refrigerant enters the supersonic ejector 14 and is ejected from the nozzle at high speed.
The remaining low-pressure dry saturated vapor refrigerant from the evaporator 1 is sent to the inlet of the ejector 14, where it is attracted when the high-pressure dry saturated vapor refrigerant is injected at high speed from the nozzle. The refrigerant injected at high speed from the nozzle expands adiabatically and becomes low pressure (Fig. 3E). The pressure of the refrigerant that is attracted and enters the ejector 14 also decreases slightly (Fig. 3F), and these are mixed under equal pressure (Fig. 3F). 3G), the velocity is reduced at the differential user of the ejector 14, the velocity energy is converted to pressure, and the refrigerant becomes a dry, saturated medium-pressure refrigerant gas (FIG. 3H). This exits from the ejector 14 and enters the second condenser 6.
In the second condenser 6, the refrigerant is condensed by the low-temperature cooling water produced in the cooling tower 7, and becomes a medium-pressure liquid refrigerant (FIG. 3 I).

The high-pressure liquid refrigerant (FIG. 3C) coming out of the gas-liquid separator 13 is sent to the expansion valve 15, and the medium-pressure liquid refrigerant (FIG. 3 I) coming out of the second condenser 6 is sent to the expansion valve 9. Low-pressure liquid refrigerant (the one coming out of the expansion valve 9 is
What comes out of the expansion valve 15 (Fig. Figure A). The above is just one example, and if the second condenser 6 is air-cooled, the cooling tower 7 is not necessary. Further, the first condenser 3 and the evaporator 1 can be directly connected to the refrigerant coil and used as a cooling/heating coil without exchanging heat with hot water or cold water.

As explained above, this device is capable of efficiently performing cooling and heating at the same time when the outside temperature is low, so it is useful for office buildings that generate a large amount of heat in the winter, such as communication facility buildings, and that require air conditioning even in the winter. It has the advantage of being able to efficiently cool and heat buildings that require heating. In addition, hot water can be obtained even in the summer, so it can be used for hot water supply.

Since the present invention has such a structure, (1)
It has a high coefficient of performance and can perform cooling and heating at the same time with a small compressor power. By using an accumulator for gas-liquid separation to separate the low-pressure vaporized refrigerant from the evaporator into the compressor and the ejector, the balance of refrigerant circulation can be improved. produce an effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional heat recovery type heat pump device, FIG. 2 is a block diagram of a heat recovery type heat pump device of the present invention, and FIG. 3 is a diagram of state changes of a refrigerant in the device of the present invention. 1: evaporator, 2: compressor, 3: first condenser,
4: Hot water coil for heating, 5: Hot water piping, 6: Second
Condenser, 7: Cooling tower, 8: Cooling water piping, 9: Expansion valve, 10: Cooling water coil 11: Chilled water piping, 1
2: refrigerant piping, 13: gas-liquid separator, 14: supersonic ejector 15: expansion valve, A to K: refrigerant status display symbols.

Claims (1)

[Claims] 1. In a heat recovery heat pump device composed of an evaporator, a compressor, two condensers, and an expansion valve, a first condenser, a gas-liquid separator, an ejector, and a second condenser are connected in series, and the evaporator The gas-liquid mixed refrigerant coming out of the first condenser is separated into gas-phase refrigerant and liquid-phase refrigerant by the gas-liquid separator, and the separated liquid-phase refrigerant is passed through an expansion valve. On the other hand, the separated gas phase refrigerant is injected from the ejector, and a part of the refrigerant going to the compressor is sucked from the evaporator and guided to the second condenser. A heat recovery type heat pump device configured to return refrigerant discharged from a condenser to the evaporator through an expansion valve.