KR20060012519A - Heat pump system - Google Patents

Abstract

The present invention relates to a heat pump system, and more particularly, in a heat pump system consisting of a compressor-> condenser-> expansion valve-> evaporator-> compressor, a second condenser of a coil type is placed after the condenser. The present invention relates to a heat pump system further configured to supply a condensation heat generated to an evaporator, and to extract a part of liquid refrigerant from an outlet of the condenser and to mix dry saturated steam introduced into a compressor.

In the present invention, a coil condenser is placed next to the condenser, and the condenser heat is supplied to the evaporator, and the liquid condenser for extracting a part of the liquid refrigerant from the outlet of the condenser and mixing the dry saturated steam introduced into the compressor. Since the additional configuration is used without wasting very little energy, to ensure the stability of the entire heat pump system, there is an effect of reducing the load of the compressor by increasing the temperature of the refrigerant flowing into the compressor.

Heat Pump, Heat Absorption, Freon, Heat Source, Energy

Description

Heat Pump System {HEAT PUMP SYSTEM}             

1 is a schematic diagram of a heat pump system in the prior art;

Figure 2 is a schematic diagram of a heat pump system showing one embodiment according to the present invention.

*** Explanation of main parts of drawing ***

10. Compressor 20. Condenser 22. Auxiliary tank

24. Hot water tank 30. Expansion valve 40. Evaporator

42. Fan 50. Second condenser 60. Heater

62. Sensor

The present invention relates to a heat pump system, and more particularly, in a heat pump system consisting of a compressor-> condenser-> expansion valve-> evaporator-> compressor, a second condenser of a coil type is placed after the condenser. In addition, the condensation heat is supplied to the evaporator, and a liquid heater for extracting a part of the liquid refrigerant from the outlet of the condenser and mixing it with the dry saturated steam introduced into the compressor is used, so that very little energy is used without wasting. The present invention relates to a heat pump system that has the effect of reducing the load on the compressor by increasing the temperature of the refrigerant flowing into the compressor and stabilizing the entire heat pump system.

1 is a typical conventional heat pump system.

Referring to FIG. 1, the refrigerant is introduced into the compressor 10 via the compressor 10, the condenser 20, the expansion valve 30, and the evaporator 40 in the heat pump system.

Since the compressor 10 needs to compress the refrigerant, electricity is consumed to drive the compression motor. In the evaporator 40, a fan 42 must be installed to supply external heat, and the fan 42 is blown to blow external air. When you turn), electricity is consumed.

The superheated steam passed through the compressor 10 is converted into a liquid phase in a condenser, which is a heat exchanger, emits latent heat, and heat-exchanged with the hot water line passing through the condenser 20 is filled in the hot water tank. The auxiliary tank 22 is connected to the hot water line, the raw water pipe may be directly connected.

Republic of Korea Utility Model Registration No. 20-281266 (Application No. 20-2002-4826), Compressor for compressing the refrigerant gas in a state of high temperature and high pressure discharge; A condenser condensing the refrigerant compressed by the compressor into the liquid phase; An expansion valve for expanding the liquid refrigerant in a high temperature and high pressure state condensed in the condenser into a liquid refrigerant in a low pressure state; A receiver installed between the condenser and the expansion valve and between the second condenser and the expansion valve to supply only the liquid refrigerant to the expansion valve, respectively; An evaporator which evaporates each of the refrigerants expanded by the expansion valve while evaporating while achieving a refrigerating effect by heat exchange with the object to be cooled using latent heat of evaporation of the refrigerant; An auxiliary condenser recovering heat from the high temperature refrigerant liquid condensed in the condenser; An ejector which boosts the refrigerant vapor evaporated in the evaporator through the ejector to increase the refrigerant circulation by reducing the specific volume of the compressor inlet; A superheat degree adjusting device for automatically adjusting the superheat degree of the refrigerant vapor at the compressor inlet; A capacity control device for automatically controlling the flow rate of the refrigerant to control the capacity; A multi-stage condensation pressure control valve for controlling the condensation pressure in multiple stages; Hot condenser and cold condenser systems to produce hot and moderate hot water; A heat pump system is disclosed.

However, the conventional superheat control device of the heat pump system requires a heat exchanger for heat exchange between the refrigerant passing through the condenser and the refrigerant vapor at the compressor inlet, and the excessive temperature of the refrigerant flowing into the expansion valve (expansion valve). There was a problem such that the refrigerant through the expansion valve is not converted to the wet steam state due to degradation. In addition, the auxiliary condenser of the conventional heat pump system, which uses water as the capacity of the main condenser, is inevitably installed, and has a problem in that it cannot sufficiently extract energy from the refrigerant.

The present invention is to solve the problems of the prior art as described above, to place the second condenser of the coil type next to the condenser, supply the generated heat of condensation to the evaporator, and extracts a part of the liquid refrigerant from the outlet of the condenser compressor By further configuring a liquid heater to mix the dry saturation steam flowing into the, to provide a heat pump system that has the effect of reducing the load on the compressor by increasing the temperature of the refrigerant flowing into the compressor to stabilize the entire heat pump system For that purpose.

The heat pump system according to the present invention comprises a compressor for compressing a refrigerant in a dry saturated vapor state delivered from an evaporator to a saturated steam state at a high temperature, and condensing the refrigerant delivered from the compressor by converting the refrigerant into a liquid phase. A condenser, a second condenser for additionally condensing the refrigerant passing through the condenser, and introducing the heat source into the evaporator, an expansion valve for expanding the refrigerant passing through the second condenser and converting it into wet steam, and a refrigerant passing through the expansion valve. And an evaporator for converting into a dry saturated vapor state, and a liquid heater for extracting a part of the liquid refrigerant from the outlet of the condenser or the second condenser and mixing the dry saturated steam introduced into the compressor.

It is preferable that the amount of the coolant delivered from the outlet of the condenser is adjusted according to the temperature of the coolant detected from the sensor installed at the outlet of the compressor.

The liquid heater is preferably mixed with the dry saturated vapor introduced into the compressor by evaporating the refrigerant delivered from the outlet of the condenser.

Preferably, the second condenser is located inside the evaporator.

Hereinafter, with reference to the drawings will be described in detail. However, these drawings are for illustrative purposes only and the present invention is not limited thereto.

Figure 2 is a schematic diagram of a heat pump system showing one embodiment according to the present invention.

2, the heat pump system according to the present invention, the compressor 10, the condenser 20, the auxiliary tank 22, the hot water tank 24, the expansion valve 30, the evaporator 40, the cooling fan 42 ), A second condenser 50, a liquid heater 60, and a sensor 62.

In the heat pump system, the refrigerant passes through the compressor 10, the condenser 20, the second condenser 50, the expansion valve 30, and the evaporator 40, and is introduced into the compressor 10 again. A part of the refrigerant at the outlet of the () is introduced into the compressor 10 via the liquid heater 60. The line leading into the column 60 may be drawn from the outlet of the second condenser 50.

In one embodiment of the present invention, the refrigerant uses R22 freon gas.

The compressor 10 compresses the refrigerant in the dry saturated state transferred from the evaporator 40 and converts the refrigerant into a superheated steam state.

The superheated steam passed through the compressor 10 is converted into a liquid phase in the condenser 20, which is a heat exchanger, and releases latent heat. The hot water exchanged with the hot water line passing through the condenser 20 is filled in the hot water tank. The auxiliary tank 22 is connected to the hot water line, the raw water pipe may be directly connected.

In an embodiment of the present invention, the condenser 20 uses a plate heat exchanger, but in some cases, various types of heat exchangers may be used.

The refrigerant passing through the condenser 20 passes through the second condenser 50. The second condenser 50 uses a coil type condenser. The second condenser 50 is to extract additional heat source from the refrigerant passing through the condenser 20, the coil-type condenser is located in the evaporator 40 to achieve the purpose. The heat generated in the second condenser 50 is used as a heat source of the evaporator 40.

The refrigerant passing through the second condenser 50 is introduced into the expansion valve 30 and converted into wet steam.

Although not shown, a receiver for converting a liquid that is not changed into a liquid phase from the refrigerant passing through the previous stage of the expansion valve 30 may be further included. The receiver lowers the temperature by causing the line at the outlet of the second condenser 50 to pass through the evaporator 40, thereby changing the gaseous refrigerant into a liquid state.

The refrigerant in the wet steam state via the expansion valve 30 is introduced into the evaporator 40. The wet steam introduced into the evaporator 40 instantaneously drops in temperature from -20 to -30 ° C, exchanges heat with the outside, and increases in temperature. Looking at the external part without considering the instantaneous temperature drop, the low temperature and low pressure steam of about 15 ° C. introduced into the evaporator 40 by the wind by the fan 42 is a low temperature of 0 ° C. to 5 ° C. via the evaporator 40. Converted into low pressure dry saturated steam.

The low temperature low pressure dry saturated vapor passing through the evaporator 40 is introduced into the compressor 10 and compressed.

When the temperature of the outside air falls below 5 ° C or below freezing, the temperature of the low temperature low pressure dry saturated vapor passing through the evaporator 42 becomes lower than 0 ° C to 5 ° C, and when the low temperature refrigerant enters the compressor 10, the compressor Since the temperature of the outlet of 10 is low, the temperature of the hot water in the condenser 20 cannot be properly increased. Accordingly, the low temperature and low pressure drying introduced into the compressor 10 is provided by interposing a liquid heater 60 through which a small amount of refrigerant is extracted at the outlet of the condenser 20 or the second condenser 50 and injected into the inlet of the compressor 10. Raise the temperature of saturated steam. The liquid heater is formed in a valve structure that can adjust the amount of refrigerant to be drawn out from the outlet of the condenser 20 or the second condenser 50 as necessary. The valve of the liquid heater 60 is opened or closed according to the temperature of the refrigerant detected by the sensor 62 mounted at the outlet of the compressor 10 is adjusted. The temperature of the refrigerant coming out of the outlet of the compressor 10 by the liquid heater 60 may be adjusted to an appropriate temperature.

Refrigerant via compressor 10 enters condenser 20 and forms a new cycle.

Conventional heat pump has a low pressure of 6 ~ 7kgf / ㎠ and a high pressure of 15kgf / ㎠ at the time of compression, the refrigerant compression temperature was designed based on 54.5 ℃. Moreover, there was little function of regulation according to the change of the outside temperature, and thus the flow of the refrigerant could not be kept constant. Increasing the pressure of the compressor without adjusting the temperature of the refrigerant according to the change in the outside temperature causes a sudden load on the heat pump system, so that the system cannot tolerate as described above. Thus, 15 kgf / cm 2 is an appropriate design pressure.

In the heat pump of the present invention, by directly controlling the temperature of the refrigerant gas flowing into the compressor, the pressure of the compressor is increased from 15 kgf / cm 2 to 21 kgf / cm 2, thereby performing the performance up to 97.8 ° C., which is the critical temperature of the R22 freon gas. It raises the coefficient to the extreme and operates more than B80 ~ 90% even if the outside temperature drops below zero.

As described above, according to the present invention, the second condenser of the coil type is placed after the condenser, the generated condensation heat is supplied to the evaporator, and a part of the liquid refrigerant is extracted from the outlet of the condenser and mixed with the dry saturated steam introduced into the compressor. Since the heat sink is configured to be additionally used, it is possible to use very little energy without wasting, to stabilize the entire heat pump system, and to increase the temperature of the refrigerant flowing into the compressor, thereby reducing the load on the compressor.

Claims (5)

In a heat pump system, A compressor for compressing a refrigerant in a dry saturated vapor state transferred from an evaporator to a saturated steam state at a high temperature; A condenser which phase-converts the refrigerant delivered from the compressor into a liquid phase and condenses it to form heat exchange with the outside; A second condenser for additionally condensing the refrigerant having passed through the condenser and introducing the heat source into the evaporator; An expansion valve for expanding the refrigerant passing through the second condenser and converting it into wet steam; An evaporator for evaporating the refrigerant passing through the expansion valve to a dry saturated vapor state; A heat pump system having a liquid heater for extracting a part of the liquid refrigerant from the outlet of the condenser or the second condenser and mixed with the dry saturated steam introduced into the compressor. The method of claim 1, The heat pump is heat pump system, characterized in that the amount of the refrigerant delivered from the outlet of the condenser is adjusted according to the temperature of the refrigerant detected from the sensor installed at the outlet of the compressor. The method according to claim 1 or 2, The heat pump is a heat pump system, characterized in that for evaporating the refrigerant delivered from the outlet of the condenser and mixed with the dry saturated steam introduced into the compressor. The method according to claim 1 or 2, And the second condenser is located inside the evaporator. The method of claim 3, And the second condenser is located inside the evaporator.

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