KR100572917B1 - Dehumidification and freezing circuit saving power having double cooling construction - Google Patents

Abstract

The present invention relates to an energy-saving refrigeration dehumidification refrigeration circuit having a two-stage cooling structure, wherein a three-way valve is installed in the middle of a compressor, an evaporator, an expansion valve, a condenser, a blower fan, and a condenser to provide a separate connection flow path connected to the refrigerant flow path. In a refrigerating circuit having a heating coil section for dehumidifying an evaporator by transferring a refrigerant gas having a high temperature and high pressure therethrough, the evaporator is divided into first and second evaporators, and is separated between the first and second evaporators. Arranging a heating coil; During the cooling operation of the refrigerating circuit, the channel of the riching coil part is closed and the channels of the first and second evaporators are opened, so that the high temperature and high pressure liquefied refrigerant is first and second evaporators through the first and second expansion valves, respectively. As the air is sent to the air, the indoor air is converted into low-temperature medium-humidity air and discharged into the room by the blowing fan; During the dehumidification operation, the liquefied refrigerant at room temperature passing through the Richting Coil part by opening the channels of the Richting Coil part and closing the channels of the First and Second evaporator is passed through the first and third expansion valves. As each air is discharged into the air, the air having a low temperature and medium humidity through the first evaporator is first dehumidified as it passes through the high-heating coil and changes to room temperature at the same time. It is characterized in that it is discharged to the room in a low temperature and low humidity state.

Refrigeration Circuit, Dehumidification, Energy Saving, Richting Coil, Split Evaporator

Description

Energy Saving Cooling Dehumidification Refrigeration Circuit with Two-Stage Cooling Structure {Dehumidification and Freezing Circuit Saving Power Having Double Cooling Construction}

1 is a schematic diagram of a power-saving refrigeration circuit having a two-stage cooling structure according to the present invention;

Figure 2 is a flow chart during the cold air operation of the power-saving refrigeration circuit having a two-stage cooling structure according to the present invention,

3 is a flowchart illustrating a dehumidification operation of a power saving type refrigeration circuit having a two-stage cooling structure according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: compressor 11: condenser

13: first evaporator 15: second evaporator

17: heating coil section 19: blowing fan

21-27: 1st-7th flow path 22a, 22b, 25a: branch flow path

31 to 36: first to sixth solenoid valves 41 to 43: first to third expansion valves

51, 52: first and second check valve

The present invention relates to a power-saving refrigeration circuit having a two-stage cooling structure, and in particular, by forming a pair of evaporators and placing a heating coil between the pair of evaporators, the cold air cooled by the primary evaporator is heated. Refrigerant-type refrigeration circuit having a two-stage cooling structure capable of maintaining a low indoor temperature while performing secondary cooling and dehumidification of air that has been dehumidified while passing through a coil and heated at a secondary evaporator. will be.

In general, the refrigeration circuit is a cold air or cold air generating circuit used in air conditioners or refrigerators widely used in general homes as well as various refrigeration apparatus and air conditioners.

The refrigeration circuit is mainly composed of a compressor, a condenser, an expansion valve, and an evaporator. The refrigerant compressed to high pressure by the compressor is liquefied into a high temperature and high pressure refrigerant liquid while passing through the condenser, and the high temperature and high pressure refrigerant flowed into the expansion valve. The low-temperature low-pressure refrigerant that expands and throttles the liquid flows into the evaporator, and the evaporator cools the air to be cooled through the evaporator (heat exchanger) with latent heat of evaporation.

Therefore, by sending the low temperature air to the outside by the blowing fan mounted on the evaporator, the cold or low temperature air is provided to the room.

However, the condensation condensation water is generated in the fluid pipe and the plurality of fins of the evaporator during the evaporation process in the above-described evaporator, and the wet air is dried. In the related art, a separate heater device is installed to dehumidify the indoor air by the heater heat.

However, the conventional cooling and dehumidifying method as described above is to dehumidify the indoor air by applying a power to a separate heater device to open a high temperature heater, resulting in a very high power consumption and high power consumption.

Therefore, the present applicant, as disclosed in Korean Patent Registration No. 424542 in order to solve the above problems, branched the middle part of the condenser of a conventional refrigeration circuit by a three-way valve, and separates the evaporator by two three-way valves. By connecting the re-heating coil of the reheating coil, the three-way valve mounted on the condenser changes the flow of the refrigerant gas of the high temperature and high pressure passing through the condenser so that the refrigerant gas of the high temperature and high pressure passes The wet air which passed through the evaporator was dried and dehumidified by the heat source of.

Accordingly, the dehumidification operation is performed by using the waste heat of the condenser under the basic cooling cycle without installing a separate device for dehumidification, that is, an electric heater or a magnetic switch as in the prior art. Energy could be saved.

However, in the case of dehumidifying the wet air passing through the evaporator using the heating coil which uses the waste heat of the condenser as the heat source, the wet air is dried and dehumidified while the low temperature air changed into the low temperature state by the evaporator passes the high temperature heating coil. At the same time the temperature rises again, the hot air is discharged into the room in this state to increase the room temperature and eventually there is a problem that the electrical energy is required to lower the elevated room temperature by the cooling operation again.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the object thereof is to form a pair of evaporators and to arrange the heating coils between the pair of evaporators, so that the low-temperature air cooled by the primary evaporator is used to It is to provide a power-saving refrigeration circuit having a two-stage cooling structure that can maintain a low indoor temperature while performing secondary cooling and dehumidification of air that has been dehumidified while passing and temperature rises through a secondary evaporator. .

In order to achieve the above object, the present invention relates to a power-saving refrigeration circuit having a two-stage cooling structure, a three-way valve in the middle of the compressor, evaporator, expansion valve, condenser, blower fan and condenser, In the refrigeration circuit having a heating coil for transferring the refrigerant gas of high temperature and high pressure through a separate connection flow path connected to dehumidification, the evaporator is divided into first and second evaporators, and the first And arranging the riching coil section between the second evaporator; During the cooling operation of the refrigerating circuit, the channel of the riching coil part is closed and the channels of the first and second evaporators are opened, so that the high temperature and high pressure liquefied refrigerant is first and second evaporators through the first and second expansion valves, respectively. As the air is sent to the air, the indoor air is converted into low-temperature medium-humidity air and discharged into the room by the blowing fan; During the dehumidification operation, the liquefied refrigerant of the low temperature passed through the Richting Coil part by opening the channels of the Richting Coil part and closing the channels of the First and Second evaporator, through the first and third expansion valves. As each air is discharged to the air, the air of low temperature and medium humidity through the first evaporator is first dehumidified as it passes through the high temperature heating coil and is changed to room temperature. It provides a power-saving refrigeration circuit having a two-stage cooling structure characterized by discharging the air heat-exchanged by the second low temperature and low humidity while passing through the second evaporator through a second evaporator.

Therefore, in the present invention described above, the high temperature and low humidity air firstly dehumidified by the Richting Coil is secondly cooled through the second evaporator, and the air dehumidified firstly by the Richting Coil is exchanged through the second evaporator. By applying cold and humid air to the room, the energy saving effect and the cooling and dehumidification effect can be maximized.

(Example)

Referring to the power saving type refrigeration circuit having a two-stage cooling structure according to the present invention in detail with reference to the drawings as follows.

1 is a schematic diagram of a power-saving refrigeration circuit having a two-stage cooling structure according to the present invention.

First, the refrigeration circuit according to the present invention is a low-temperature low-pressure refrigerant gas (0 ~ 5 ℃) passed through the divided first and second evaporator (13, 15) and the first and second evaporator (13, 15) Is compressed so that it can be easily cooled and liquefied in the condenser 11, the compressor 10 for converting the compressed refrigerant gas of high temperature and high pressure, and the refrigerant gas of high temperature and high pressure by the compressor 10 to condensation heat from water or air And a condenser 11 for releasing and liquefying condensation heat such as the sum of the evaporation heat taken from the first and second evaporators 13 and 15 and the compression heat obtained from the compressor 10.

In this case, the compressor 10 and the condenser 11 are connected by the first flow path 21, and the condenser 11 and the first and second evaporators 13 and 15 are connected through the second flow path 22. Are interconnected.

Furthermore, between the condenser 11 and the second flow path 22, the high-temperature and high-pressure refrigerant gas introduced into the condenser 11 through the compressor 10 is maintained at a high temperature. A third flow path 23 is disposed to be sent to the 17, and one end of the third flow path 23 is connected to the middle of the condenser 11, and a second flow path 22 is connected to the bottom of the condenser 11, respectively. It is.

In this case, first and second solenoid valves 31 and 32 are provided in the condenser 11 and the third flow path 23 so as to control the flow of the high temperature and high pressure refrigerant.

In addition, the branched flow path 22a of the sixth flow path 26 into which the high temperature and high pressure liquefied refrigerant passing through the condenser 11 is introduced into the first evaporator 13 and the riching coil part 17 from the second flow path 22. The third solenoid valve 33 for controlling the refrigerant flow of the first evaporator 13 and the fourth solenoid valve 34 for controlling the refrigerant flow of the heating coil unit 17 through the sixth flow path (26) at Is installed.

In addition, the high temperature and high pressure liquefied refrigerant passing through the condenser 11 is first and second in the branch flow passage 22b for split-heat exchange in the first and second evaporators 13 and 15 through the second flow passage 22. 2 is divided equally into the evaporator (13, 15), and controlling the refrigerant flow before entering the second evaporator (15) from the first expansion valve (41) and branch passage (22b) before the first evaporator (13) 5th and 6th solenoid valves 35 and 36, the 2nd expansion valve 42 which throttles and expands the refrigerant flow volume of a heat exchange state in the 2nd evaporator 15, and the 3rd expansion valve 43 dedicated to refrigeration dehumidification. ) Are installed respectively.

On the other hand, between the first and the second evaporator (13, 15) is a heating coil portion 17 for transferring the refrigerant gas of high temperature and high pressure to perform dehumidification.

In addition, the first and second evaporators 13 and 15 are respectively connected to fourth flow passages 24 connected to suction lines of the compressor 10.

Furthermore, as shown in FIG. 1, the seventh flow path 27 includes a first check valve for preventing liquefied refrigerant flowing to the first and second evaporators 13 and 15 from flowing back to the seventh flow path 27 during the cooling operation. 51 is provided, and the second flow passage 22 passes through the third flow passage 23 during the dehumidification operation, and the refrigerant flowing to the riching coil unit 17 through the second flow passage 22 is again flowed into the second flow passage 22. Each of the second check valves 52 for preventing the flow back to the condenser 11 through).

According to the present invention configured as described above, the evaporator is divided into first and second evaporators 13 and 15, and the rich coil unit 17 is disposed between the first and second evaporators 13 and 15. Accordingly, during the dehumidification operation, the indoor air sucked by the blower fan 19 is lowered through the first evaporator 13 and heat-exchanged with air having a low temperature and medium humidity of dehumidification, and then the low-temperature air is blown again. The second dehumidification is performed by passing through the high-limiting coil unit 17 by the fan 19.

At this time, the low-temperature air of the second dehumidification is changed to room temperature, heat exchange in the second evaporator 15 through the third expansion valve 43 for dehumidification so as to prevent the air of the room temperature is discharged to the room as it is, and again low temperature. After changing to low humidity, it is released into the room.

Accordingly, the low temperature and low temperature air exchanged by the first evaporator 13 is essentially blocked to increase the temperature by the riching coil unit 17 and to be discharged into the room at room temperature, thereby greatly improving the cooling efficiency of the refrigerating circuit. It can be improved to maintain low humidity, and can greatly contribute to saving electric energy.

Hereinafter, with reference to Figures 2 and 3 will be described in sequence the operation state during the freezing and dehumidification operation of the refrigeration circuit according to the flow of the refrigerant, respectively.

Figure 2 is a flow chart during the cold air operation of the power-saving refrigeration circuit having a two-stage cooling structure according to the present invention.

In the present invention, during the freezing operation, as shown in FIG. 2, the low-temperature low-temperature refrigerant gas, which has passed through the first and second evaporators 13 and 15, is changed into a high-temperature high-pressure refrigerant while passing through the compressor 10. Then, it moves to the condenser 11 through the 1st flow path 21.

Subsequently, when the refrigerant gas flows into the condenser 11, the second solenoid valve 32 is closed and the first solenoid valve 31 is opened, and the high temperature and high pressure half-liquid refrigerant passes through the condenser 11. In the condensed liquefied state, it moves along the second flow path 22 toward the first and second evaporators 13 and 15.

At this time, the fourth solenoid valve 34 is closed, the third solenoid valve 33 and the fifth solenoid valve 35 are opened, and the sixth solenoid valve 36 is closed.

Accordingly, the high temperature and high pressure liquefied refrigerant moving along the second flow path 22 through the condenser 11 passes through the third and fifth solenoid valves 33 and 35 and the first and second expansion valves 41 and 42. Passing through the first evaporator 13 and the fifth flow path 25 is introduced into the second evaporator 15 in a state of expansion and constriction. In this case, the refrigerant introduced into the fifth flow path 25 is expanded and throttled through the second expansion valve 42 for cooling while the sixth solenoid valve 36 is closed and the fifth solenoid valve 35 is opened. Into the second evaporator 15 in a state.

Herein, the refrigerant undergoes heat exchange while passing through the first and second evaporators 13 and 15, thereby changing indoor air having a temperature of ambient temperature above or above room temperature to a low temperature.

At this time, the low-temperature indoor air is cooled while sequentially passing through the first and second evaporators 13 and 15 by the blower fan 19 to be cooled into the room.

3 is a flowchart illustrating a dehumidification operation of a power saving type refrigeration circuit having a two-stage cooling structure according to the present invention.

Meanwhile, in the refrigerating circuit of the present invention, the refrigerant gas having a low temperature and low pressure of about 0 to 5 ° C. that passes through the first and second evaporators 13 and 15 as shown in FIG. 3 passes through the compressor 10 during the dehumidification operation. After changing to a high-temperature high-pressure refrigerant gas of 70 to 80 ℃, it is moved to the condenser 11 through the first flow path (21).

Subsequently, when the high temperature and high pressure refrigerant gas flows into the condenser 11, the second solenoid valve 32 is opened and the first solenoid valve 31 is closed so that the high temperature and high pressure half-liquid refrigerant is the condenser 11. It does not pass completely through, but flows directly into the second flow path 22 through the third flow path 23, at this time the temperature of the semi-liquefied refrigerant is about 60 ~ 65 ℃, the state passed through the compressor 10 Maintain a slightly lower temperature. The flow of the refrigerant is to use the rich coil unit 17 using the waste heat of the condenser 10 as a heat source.

Subsequently, the high temperature, high pressure, semi-liquefied refrigerant moves along the second flow path 22 toward the riching coil unit 17, and at the same time, the third solenoid valve 33 is closed and the fourth solenoid valve 34 is closed. When opened, the high temperature and high pressure refrigerant flows into the riching coil unit 17 along the sixth flow path 26.

The high temperature and high pressure refrigerant passes through the Richtering coil unit 17 and heats the Richtering coil unit 17. As a result, the low-temperature medium humidity air heat-exchanged through the first evaporator 13 is heated by the Richter Coin. While passing through the portion 17, while the heat exchange with the heating heat source (waste heat), the humidity is lowered and the temperature is increased.

Thereafter, the indoor air passing through the primary evaporator 13 passes through the riching coil unit 17, and the dehumidified air is raised in temperature, while the high temperature air passes through the second evaporator 15. It is changed to low temperature again and dehumidification is performed once again.

Meanwhile, the refrigerant passing through the riching coil unit 17 is introduced into the first evaporator 13 through the first expansion valve 41 along the seventh flow path 27 in a state where a part of the refrigerant is condensed and liquefied. At the same time, the fifth evaporator 15 is moved to the second evaporator 15 side. In this case, the fifth solenoid valve 35 is closed and the sixth solenoid valve 36 is opened so that the refrigerant is in charge of the dehumidification of the refrigerant. The low-temperature low-pressure refrigerant flowing into the second evaporator 15 through the third expansion valve 43 and passing through the first and second evaporators 13 and 15 again passes through the fourth flow path 24 to the compressor 10. Is cycled to

Accordingly, the present invention prevents the air having the temperature raised by the riching coil unit 17 from being discharged into the room as it is, and maintains the first and second evaporators 13, As the secondary cooled air is discharged into the room in a low temperature dehumidified state by 15), an excellent dehumidification effect can be obtained at the same time as efficient cooling is achieved.

In the above-described present invention, the secondary cooling heat exchanger of the high temperature and low humidity air firstly dehumidified by the Richting Coil is performed through the second evaporator, as well as the second freeze dehumidification of the air dehumidified by the Richting Coil again. Accordingly, there is an advantage to maximize the effect of energy saving and cooling and dehumidification effect by sending low-temperature and humid air into the room.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

Claims (1)

The present invention relates to a power-saving refrigeration circuit having a two-stage cooling structure, wherein a valve is installed at an intermediate part of a compressor, an evaporator, an expansion valve, a condenser, a blower fan, and a condenser to supply refrigerant gas of high temperature and high pressure through a separate connection channel connected to the refrigerant channel. In the refrigeration circuit having a heating coil portion for transferring and dehumidifying the evaporator, Dividing the evaporator into first and second evaporators and disposing a heating coil section between the first and second evaporators; During the cooling operation of the refrigerating circuit, the channel of the riching coil part is closed and the channels of the first and second evaporators are opened, so that the high temperature and high pressure liquefied refrigerant is first and second evaporators through the first and second expansion valves, respectively. As the air is sent to the air, the indoor air is converted into low-temperature medium-humidity air and discharged into the room by the blowing fan; During the dehumidification operation, the liquefied refrigerant of the low temperature passed through the Richting Coil part by opening the channels of the Richting Coil part and closing the channels of the First and Second evaporator, through the first and third expansion valves. As each air is discharged into the air, the air having a low temperature and medium humidity through the first evaporator is first dehumidified as it passes through the high-heating coil and changes to room temperature at the same time. Energy-saving refrigeration circuit having a two-stage cooling structure characterized in that it is discharged to the room in a closed state.

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