KR20140121038A - System for Cycling Refrigerant of Heat Pump - Google Patents

Abstract

The present invention relates to a coolant circulation system of a heat pump and, more specifically, to a coolant circulation system of a heat pump which produces water at a preferred temperature without generating frost on a evaporator of the heat pump. The present invention comprises a first heat exchanger; a second heat exchanger; solenoid valves; expansion valves; a sensor for the temperature of discharged gas; a sensor for the temperature of compressed gas; and a controller. The first heat exchanger exchanges the heat of coolant gas, which was generated in a compressor by high temperature and high pressure and transferred through a pipeline, with water being circulated through a pipeline by a circulation pump, and provides the hot water which has completed the heat transfer to a hot water tank.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a refrigerant circulation system for a heat pump,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a refrigerant circulation system of a heat pump that generates hot water, and more particularly, to a refrigerant circulation system of a heater pump capable of producing hot water of a desired water temperature without causing a malfunction in the evaporator of the heat pump.

Generally, a heat pump is a refrigeration cycle in which a refrigerant evaporates in an evaporator, takes heat away from it, becomes a gas, and again discharges heat to the surroundings by a condenser, thereby liquefying the heat. Refrigerator when used. It is called a heat pump in the sense that the heat is sucked from the low temperature part to the high temperature part. The heat source is air, well water, solar heat, and geothermal heat.

The heat pump is equipped with a compressor, an evaporator and a condenser for compressing, evaporating and condensing the refrigerant. The heat pump uses the cold air generated by the heat exchange with the surrounding air due to the evaporation of the refrigerant, and is used for the cooling. The heat pump reverses the refrigerating cycle operation of the refrigerant and generates heat through the heat exchange with the ambient air due to evaporation of the refrigerant. It is used for heating by heating hot water with hot air. At this time, except for the condenser, heating is generally used as an air-heating boiler.

In the heat pump, the surface of the evaporator is frozen as the outdoor temperature is lowered, or snow is piled up in the evaporator. In such a case, the refrigerant does not evaporate when the outdoor heat is generated, and the resistance of the heat transfer between the air and the refrigerant So that the heat exchange efficiency of the evaporator is remarkably lowered.

As a conventional technique for preventing the evaporation of the evaporator, Korean Patent Registration No. 10-0835328 discloses that when the evaporator surface is frozen or unstable due to the decrease of the outdoor temperature at the time of heating in the control unit, the heat pump is stopped, At this time, the heated defrost water is supplied to the sprinkling panel by the operation of the pressurizing pump, and the defrosted water discharged from the upper part of the evaporator is spilled down and defrosted in a short time to improve the heat exchange efficiency of the evaporator, The water spraying hole of the spraying panel facing the refrigerant pipe exposed to the radiating fins is opposed to the refrigerant pipe exposed to the space between the radiating fins so that the defrosted water injected through the spraying hole is concentrated on the refrigerant pipe and the defrosting time can be shortened A defrost apparatus is disclosed.

Also, as a related art, Korean Patent Laid-Open Publication No. 10-2010-0110027 discloses that the moisture contained in the auxiliary heat source is frozen on the surface of a heat exchanger used as an evaporator at the time of supplying an auxiliary heat source under the control of a control unit, A heat pump system using untamed air heat and water heat storage which can stably operate the system can be prevented.

Also, as a conventional technique, Korean Patent Registration No. 10-1044616 has a function of setting a time interval, a repetition time, and a temperature range where an opening operation is performed, in which the control unit operates the three-way valve to open in the direction of the supply line, It is possible to solve the problem that the operation of the evaporator is not normally performed due to the occurrence of the heat pump and thus the efficiency of the heat pump is lowered. In particular, since the configuration and operation can be effectively eliminated, There is disclosed a defrosting method of a heat pump evaporator using a solar heat that can expect a smooth and efficient operation of a heat pump, such as maintaining a long lifetime and improving the coefficient of performance (COP) without waste of energy.

Therefore, in order to prevent the evaporation of the evaporator from occurring, conventionally, water is sprinkled to remove the red light, or the frost preventing means according to the bypass pipe, or the fruit heated by the solar collector is supplied to the radiator. The method of eliminating the enemy by spraying causes a problem that the water is contaminated in the air and the foreign material is generated in the evaporator, thereby deteriorating the performance of the evaporator, and the method using the bypass pipe essentially eliminates the enemy generated in the evaporator It is impossible to defrost a solar collector with a heat radiator as a heat that is heated by a solar heat, and it is not able to exert its function properly on a cloudy day such as snowfall or rainfall.

In addition, conventionally, when the condensation temperature rises in the process of producing hot water in the heat pump, a problem arises in that the temperature of the hot water can not be raised because the compressor is unstable.

Korean Registered Patent No. 10-0835328 (2008. 29. 2008 Announcement) Korean Patent Publication No. 10-2010-0110027 (published on October 12, 2010) Korean Registered Patent No. 10-1044616 (issued on June 21, 2011)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to easily control the condensation temperature of a heat pump and to prevent the occurrence of an accident on a surface of an evaporator by using latent heat generated in a heat pump.

In order to achieve the above-mentioned object, the present invention provides a refrigerating machine comprising: a compressor for supplying a refrigerant gas compressed and generated at a high temperature and a high pressure through a pipe, heat-exchanging heat with the circulating water circulated through a pipe by a circulating pump, A first heat exchanger for supplying the hot water to the hot water tank; A second heat exchanger for exchanging the heat of the refrigerant gas introduced from the first heat exchanger with the refrigerant gas introduced from the receiver and discharging the heat-exchanged refrigerant gas to the compressor; A first solenoid valve installed in a pipe connected between the first heat exchanger and the receiver for controlling the flow of the refrigerant gas; A second solenoid valve installed in a pipe connected between the first heat exchanger and the second heat exchanger to intermittently flow the refrigerant gas; A third solenoid valve installed in a pipe connected between the first heat exchanger and the condenser for controlling the flow of the refrigerant gas; A fourth and a fifth solenoid valve installed in a pipe connected between the receiver and the evaporator for controlling the flow of the refrigerant gas; Sixth, seventh and eighth solenoid valves installed in parallel in a pipe connected between the receiver and the second heat exchanger to intermittently flow the refrigerant gas; A ninth solenoid valve installed in a pipe connected between the receiver and the compressor for controlling the flow of the refrigerant gas; First and second expansion valves installed in series in a pipe connected between the fourth and fifth solenoid valves and the evaporator to evaporate the refrigerant gas; Third, fourth and fifth expansion valves installed in series in a pipe connected between the sixth, seventh and eighth solenoid valves and the second heat exchanger to evaporate the refrigerant gas; A discharge gas temperature sensor installed in a pipe connected between the compressor and the first heat exchanger to sense the temperature of the refrigerant gas discharged from the compressor; A condensing gas temperature sensor installed in a pipe connected between the fourth and fifth solenoid valves in the receiver to sense the temperature of the refrigerant gas discharged from the receiver, And a controller for controlling the operation of the circulation pump by controlling the opening and closing of the first to ninth solenoid valves, and a refrigerant circulation system of the heat pump.

Further, in the present invention, the controller may open the third solenoid valve when the refrigerant gas pressure discharged from the compressor becomes equal to or higher than a predetermined pressure.

Further, in the present invention, the controller may open the sixth, seventh and eighth solenoid valves when the temperature of the refrigerant gas sensed by the discharge gas temperature sensor reaches a predetermined temperature or more.

Further, in the present invention, when the temperature of the refrigerant gas sensed by the condensed-gas temperature sensor reaches 35 ° C, the control device closes the first solenoid valve and opens the second solenoid valve to condense the refrigerant gas in the second heat exchanger The fourth, seventh and eighth solenoid valves are closed and the fifth and sixth solenoid valves are opened respectively so that the refrigerant gas is evaporated through the second and third expansion valves, The first solenoid valve is closed and the second solenoid valve is opened to lower the condensation temperature of the refrigerant gas in the second heat exchanger, and the fifth, sixth, and eighth solenoid valves And the fourth and seventh solenoid valves are opened so that the refrigerant gas is evaporated through the first and fourth expansion valves, and the control device detects that the temperature of the refrigerant gas detected by the condensed gas temperature sensor is 45 ° C The first solenoid valve is closed and the second solenoid valve is opened to lower the condensation temperature of the refrigerant gas in the second heat exchanger and the fifth, sixth and seventh solenoid valves are closed and the fourth and eight solenoid valves are opened The control device causes the first solenoid valve to be closed and the second solenoid valve to be opened when the temperature of the refrigerant gas detected by the discharge gas temperature sensor reaches 120 ° C. The fifth, sixth, and seventh solenoid valves are closed, the fourth and eighth solenoid valves are opened, and the refrigerant gas is evaporated through the first and fifth expansion valves by lowering the condensation temperature of the refrigerant gas in the second heat exchanger .

According to the present invention, when the refrigerant gas is compressed in the heat pump, the condensation temperature can be controlled to a desired temperature while producing hot water at high temperature through heat exchange, and the temperature generated on the surface of the evaporator by using the latent heat generated in the circulation system The temperature of the hot water can be raised up to about 95 ° C without any defrosting time in the winter, so that the efficiency reduction due to the defrosting can be solved and the reliability of the heat pump realized according to the present invention is improved.

1 is a block diagram showing a refrigerant circulation system of a heat pump according to an embodiment of the present invention.
2 shows the control of the control device according to the refrigerant gas temperature of the heat pump in the present invention.

Hereinafter, a refrigerant circulation system of a heat pump according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, in the construction of the heat pump, the compressor 10 compressively generates the refrigerant gas flowing from the outside at high temperature and high pressure.

The first heat exchanger 12 is supplied through a pipe for circulating a refrigerant gas compressed and generated at a high temperature and a high pressure in the compressor 10, circulates through the pipe for circulating water by the circulation pump P, Exchanged with the circulating water, and then supplies the heat-exchanged hot water to the hot water tank 18. In other words, the temperature of the refrigerant gas flowing into the compressor 10 from the first heat exchanger 12 is about 90 to 115 ° C. Correspondingly, the other side of the first heat exchanger (12) is circulated to the hot water tank (18) after the temperature of the water introduced from the hot water tank (18) is increased by heat exchange with the heat of the high temperature refrigerant gas.

A discharge gas temperature sensor S1 for sensing the temperature of the refrigerant gas discharged from the compressor 10 is installed in a pipe connected between the compressor 10 and the first heat exchanger 12. [

The second heat exchanger 14 heat-exchanges the heat of the refrigerant gas introduced from the first heat exchanger 12 with the refrigerant gas introduced from the receiver 16. The refrigerant gas heat-exchanged in the second heat exchanger (14) is discharged to the compressor (10). That is, one side of the second heat exchanger 14 is to be discharged to the compressor 10 through the heat exchange with the refrigerant gas flowing in the first heat exchanger 12 and the refrigerant gas flowing in from the receiver 16 corresponding thereto. A second solenoid valve SV2 for controlling the flow of the refrigerant gas is installed in a pipe connected between the first heat exchanger 12 and the second heat exchanger 14. [ A first solenoid valve (SV1) for interrupting the flow of the refrigerant gas is installed in the pipe connected between the second heat exchanger (14) and the receiver (16).

A third solenoid valve SV3 for controlling the flow of the refrigerant gas is installed in the pipe connected between the first heat exchanger 12 and the condenser 22. The third solenoid valve SV3 is opened when the refrigerant gas pressure discharged from the compressor 10 is higher than a certain pressure, that is, approximately 15 Mpa or more, and is closed when the pressure is approximately 14 Mpa. The third solenoid valve SV3 is opened and closed in accordance with the refrigerant gas condensing pressure, and the latent heat is sent to the condenser 22 in accordance with the circulating cycle to remove the droplet on the surface of the evaporator and increase the evaporation pressure on the low- .

The opening and closing of the fourth solenoid valve SV4 and the fifth solenoid valve SV5 is provided in a pipe connected between the receiver 16 and the evaporator 20 to intercept the flow of the refrigerant gas.

 The fourth solenoid valve SV4 and the fifth solenoid valve SV5 are connected to the inlet of the evaporator 20, respectively. The fourth solenoid valve SV4 and the fifth solenoid valve SV5 are connected in series to a pipe connected between the first expansion valve TX1 and the second expansion valve TX2 to connect the evaporator 20, I will. The first expansion valve TX1 and the second expansion valve TX2 are selectively opened and closed under the control of the controller 30. [ The other side of the evaporator 20 is connected to the suction side of the compressor 10 by a pipe.

The sixth solenoid valve SV6, the seventh solenoid valve SV7 and the eighth solenoid valve SV8 are installed in parallel in a pipe connected between the receiver 16 and the second heat exchanger 14, . That is, the sixth solenoid valve SV6, the seventh solenoid valve SV7 and the eighth solenoid valve SV8 are connected in parallel from the receiver. A third expansion valve TX3, a fourth expansion valve TX4 and a fifth expansion valve TX5 are connected to the sixth solenoid valve SV6, the seventh solenoid valve SV7 and the eighth solenoid valve SV8. 2 heat exchanger (14) so as to evaporate the refrigerant gas. The third expansion valve TX3, the fourth expansion valve TX4 and the fifth expansion valve TX5 are selectively opened and closed under the control of the control device 30. [

The ninth solenoid valve SV9 is installed in a pipe connected between the receiver (16) and the compressor (10) to intercept the flow of the refrigerant gas. The ninth solenoid valve SV9 is opened when the temperature of the refrigerant gas sensed by the discharge gas temperature sensor S1 becomes equal to or higher than a predetermined temperature, that is, approximately 115 deg. This is for controlling the discharged temperature by supplying the low-temperature refrigerant gas to the compressor 10 when the temperature discharged from the compressor 10 is 115 ° C.

The condensing gas temperature sensor S2 is installed in a pipe connected between the fourth solenoid valve SV4 and the fifth solenoid valve SV5 in the receiver 16 to sense the temperature of the refrigerant gas discharged from the receiver 16 .

The controller 30 receives the signals sensed by the discharge gas temperature sensor S1 and the condensing gas temperature sensor S2 and controls opening and closing of the first solenoid valve SV1 to the ninth solenoid valve SV9, And controls the operation of the pump P. The controller 30 controls the evaporator to remove the adverse effect of the evaporator by using the hot water supply and the latent heat in the refrigerant circulation system of the heat pump.

The evaporator 20 and the condenser 22 are installed in the heat pump. One side of the evaporator 20 is connected to the first expansion valve TX1 and the second expansion valve TX2 by piping and the other side of the evaporator 20 is connected to the second heat exchanger 14 by piping. One side of the condenser 22 is connected to the first heat exchanger 12, the second heat exchanger 14 and the receiver 16 by piping and the other side of the condenser 22 is connected to the receiver 16 by piping .

The operation of the refrigerant circulation system of the heat pump according to the present invention will be described.

1, the high-temperature, high-pressure refrigerant gas compressed and discharged from the compressor 10 produces hot water from the hot water tank 18 by heat exchange in the first heat exchanger 12 and supplies it to the hot water tank 18 . At this time, the controller 30 operates the circulation pump P to circulate hot water. When the hot water temperature rises in the first heat exchanger (12), the temperature of the refrigerant gas passing through the first heat exchanger (12) also rises. Therefore, the refrigerant gas whose temperature has risen after the heat exchange in the first heat exchanger 12 flows into the receiver 16 via the first solenoid valve SV1 opened along the pipe, and the refrigerant discharged from the receiver 16 The temperature of the gas also increases.

The temperature of the refrigerant gas discharged from the receiver 16 and supplied to the evaporator 20 is sensed by the condensing gas temperature sensor S2 and the sensed temperature signal is received by the controller 30. [

2, the control device 30 closes the first solenoid valve SV1 and closes the second solenoid valve SV1 when the temperature of the refrigerant gas sensed by the condensing gas temperature sensor S2 reaches a set temperature, SV2 are opened to lower the condensation temperature of the refrigerant gas in the second heat exchanger (14). Then, the control device 30 closes the fourth solenoid valve SV4, the seventh solenoid valve SV7 and the eighth solenoid valve SV8, and opens the fifth solenoid valve SV5 and the sixth solenoid valve SV6 So that 50% of the refrigerant gas is evaporated in the second expansion valve TX2 and 50% of the refrigerant gas is evaporated in the third expansion valve TX3.

The controller 30 closes the first solenoid valve SV1 and closes the second solenoid valve SV2 when the temperature of the refrigerant gas sensed by the condensing gas temperature sensor S2 reaches a predetermined temperature, So that the condensation temperature of the refrigerant gas is lowered in the second heat exchanger (14). The control device 30 then closes the fifth solenoid valve SV5, the sixth solenoid valve SV6 and the eighth solenoid valve SV8 and opens the fourth solenoid valve SV4 and the seventh solenoid valve SV7 And 25% of the refrigerant gas is evaporated in the first expansion valve TX1 and 75% of the refrigerant gas is evaporated in the third expansion valve TX3.

The control device 30 closes the first solenoid valve SV1 and closes the second solenoid valve SV2 when the temperature of the refrigerant gas sensed by the condensing gas temperature sensor S2 reaches a predetermined temperature, So that the condensation temperature of the refrigerant gas is lowered in the second heat exchanger (14). Then, the control device 30 closes the fifth solenoid valve SV5, the sixth solenoid valve SV6 and the seventh solenoid valve SV7, and opens the fourth solenoid valve SV4 and the eighth solenoid valve SV8 So that refrigerant gas is evaporated 10% in the first expansion valve TX1 and evaporated 90% in the fifth expansion valve TX5.

The control device 30 closes the first solenoid valve SV1 and closes the second solenoid valve SV2 when the temperature of the refrigerant gas sensed by the discharge gas temperature sensor S1 reaches a predetermined temperature, The fifth solenoid valve SV5, the sixth solenoid valve SV6 and the seventh solenoid valve SV7 are closed and the fourth solenoid valve SV6 is closed by closing the fifth solenoid valve SV6, The fourth solenoid valve SV4 and the eighth solenoid valve SV8 are opened to allow the refrigerant gas to evaporate 10% in the first expansion valve TX1 and to evaporate 90% in the fifth expansion valve TX5.

Therefore, the control device 30 can control the temperature of the condensed gas of the refrigerant and the temperature of the discharged gas by controlling the opening and closing of the plurality of solenoid valves.

The control device 30 opens the third solenoid valve SV3 when the pressure of the refrigerant gas discharged from the compressor 10 is equal to or higher than a predetermined pressure, To control the condensation pressure. In the circulation process of the refrigerant circulation system of the heat pump according to the present invention, the latent heat is sent to the condenser 22 to raise the evaporator 20 to the evaporation pressure on the low pressure side.

When the temperature of the refrigerant gas sensed by the discharge gas temperature sensor S1 reaches a predetermined temperature or higher, that is, about 115 DEG C, the control device 30 opens the ninth solenoid valve SV9, So that the temperature of the refrigerant discharged from the compressor 10 is not raised by about 115 ° C or more.

In the present invention, when the refrigerant gas is compressed in the heat pump, heat is generated at a temperature of about 90 to 115 ° C, so that hot water can be produced and the condensation temperature can be controlled to a desired temperature. It is possible to defrost the enemy of the evaporator by using the generated latent heat, so that the temperature of the hot water can be elevated up to about 95 ° C without a separate defrosting time.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who has it will know it easily.

The present invention relates to a condenser gas temperature sensor, and more particularly, it relates to a condenser gas temperature sensor, a condenser gas temperature sensor, a circulation pump, and a solenoid valve, -TX5: expansion valve

Claims (4)

A first heat exchanger that receives refrigerant gas compressed and generated in the compressor at a high temperature and a high pressure through piping, heat-exchanges the heat of the refrigerant gas with the circulating water circulated through the pipe by the circulation pump, and supplies the heat-exchanged hot water to the hot water tank;
A second heat exchanger for exchanging the heat of the refrigerant gas introduced from the first heat exchanger with the refrigerant gas introduced from the receiver and discharging the heat-exchanged refrigerant gas to the compressor;
A first solenoid valve installed in a pipe connected between the first heat exchanger and the receiver for controlling the flow of the refrigerant gas;
A second solenoid valve installed in a pipe connected between the first heat exchanger and the second heat exchanger to intermittently flow the refrigerant gas;
A third solenoid valve installed in a pipe connected between the first heat exchanger and the condenser for controlling the flow of the refrigerant gas;
A fourth and a fifth solenoid valve installed in a pipe connected between the receiver and the evaporator for controlling the flow of the refrigerant gas;
Sixth, seventh and eighth solenoid valves installed in parallel in a pipe connected between the receiver and the second heat exchanger to intermittently flow the refrigerant gas;
A ninth solenoid valve installed in a pipe connected between the receiver and the compressor for controlling the flow of the refrigerant gas;
First and second expansion valves installed in series in a pipe connected between the fourth and fifth solenoid valves and the evaporator to evaporate the refrigerant gas;
Third, fourth and fifth expansion valves installed in series in a pipe connected between the sixth, seventh and eighth solenoid valves and the second heat exchanger to evaporate the refrigerant gas;
A discharge gas temperature sensor installed in a pipe connected between the compressor and the first heat exchanger to sense the temperature of the refrigerant gas discharged from the compressor;
A condensate gas temperature sensor installed in a pipe connected between the fourth and fifth solenoid valves in the receiver to sense the temperature of the refrigerant gas discharged from the receiver,
And a controller for controlling the operation of the circulation pump by controlling the opening and closing of the first to ninth solenoid valves and receiving signals sensed by the discharge gas temperature sensor and the condensed gas temperature sensor, .
The refrigerant circulation system according to claim 1, wherein the controller opens the third solenoid valve when the pressure of the refrigerant gas discharged from the compressor becomes equal to or higher than a predetermined pressure.
The refrigerant circulation system of claim 1, wherein the controller opens the sixth, seventh and eighth solenoid valves when the temperature of the refrigerant gas detected by the discharge gas temperature sensor reaches a predetermined temperature or more.
The control apparatus according to claim 1, wherein when the temperature of the refrigerant gas sensed by the condensed-gas temperature sensor reaches 35 ° C, the control device closes the first solenoid valve and opens the second solenoid valve to condense the refrigerant gas in the second heat exchanger The fourth, seventh and eighth solenoid valves are respectively closed and the fifth and sixth solenoid valves are opened respectively so that the refrigerant gas is evaporated through the second and third expansion valves,
The controller closes the first solenoid valve and opens the second solenoid valve to lower the condensation temperature of the refrigerant gas in the second heat exchanger when the temperature of the refrigerant gas sensed by the condensed gas temperature sensor reaches 40 DEG C, The fifth, sixth and eighth solenoid valves are closed and the fourth and seventh solenoid valves are opened so that the refrigerant gas is evaporated through the first and fourth expansion valves,
The controller closes the first solenoid valve and opens the second solenoid valve to lower the condensation temperature of the refrigerant gas in the second heat exchanger when the temperature of the refrigerant gas sensed by the condensing gas temperature sensor reaches 45 DEG C, The fifth, sixth and seventh solenoid valves are closed and the fourth and eighth solenoid valves are opened so that the refrigerant gas is evaporated through the first and fifth expansion valves,
The controller closes the first solenoid valve and opens the second solenoid valve to lower the condensation temperature of the refrigerant gas in the second heat exchanger when the temperature of the refrigerant gas sensed by the discharge gas temperature sensor reaches 120 ° C., 5, 6 and 7, and the fourth and eighth solenoid valves are opened to allow the refrigerant gas to evaporate through the first and fifth expansion valves.

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