KR102019925B1 - Refrigeration system for high efficiency - Google Patents

Abstract

The present invention relates to a high-efficiency freezing system capable of improving the frequency efficiency of a freezer through the smooth operation of a compressor by completely gasifying a refrigerant injected into the compressor as well as removing flash gas by overcooling the refrigerant through a simple device. To achieve the purpose, the high-efficiency freezing system includes: a first gas-liquid separator separating a refrigerant, which comes out of an evaporator evaporating the refrigerant, into liquid and gas, and including a first line to move refrigerant gas and a second line to move refrigerant liquid; an ejector mixing the refrigerant gas supplied from the first line with the refrigerant liquid supplied from the second line; a compressor compressing the refrigerant mixed in the ejector; a condenser condensing the refrigerant compressed by the compressor; a low-pressure condensation liquid receiver receiving the refrigerant condensed by the condenser to cool and liquefy the refrigerant by exchanging heat through the refrigerant liquid flowing in the second line of the first gas-liquid separator; a first expansion valve insulating and expanding the refrigerant flowing from the low-pressure condensation liquid receiver through a wire drawing effect; and the evaporator evaporating the refrigerant expanded by the first expansion valve.

Description

High Efficiency Refrigeration System {REFRIGERATION SYSTEM FOR HIGH EFFICIENCY}

The present invention relates to a refrigeration system, and more particularly, to a high-efficiency refrigeration system that can improve the freezing efficiency of the freezer by removing the flash gas (flash gas) generated during operation of the freezer cycle through the supercooling of the refrigerant. will be.

Generally, a refrigeration cycle device operates to discharge heat of a specific material to the outside while cooling a desired space. Such a refrigeration cycle device receives the heat to be discharged to the outside through the cooling process for the refrigerant and discharges it to the outside through heat exchange with the outside air.

The refrigeration cycle device is affected by the operation and efficiency, etc., depending on the use environment. For example, when the temperature of the outside air is high, the efficiency of the heat exchanger decreases due to the increase of the compression power for dissipating heat to the outside air from the refrigeration cycle device and the increase of the working fluid. This happens when the cold air is not available.

When operating the refrigerating cycle device, if pressure loss occurs or the refrigerant is insufficiently cooled or the refrigerant is insufficient, flash gas is generated, and the refrigerant flow rate through the expansion valve is reduced by the flash gas, and cooling is performed. The capacity decreases and problems such as a decrease in the discharge and suction force of the compressor are caused.

In order to solve the above problem, the flash gas must be removed, and for this, supercooling of the refrigerant is required.

Accordingly, when the refrigerant is supercooled by section A as shown in the graph of FIG. 4A, the load of section B is applied to the refrigerator. In order to eliminate the load as much as B, it is necessary to design a large capacity of the condenser constituting the refrigeration system or to install an additional heat exchanger.

Republic of Korea Patent Publication No. 10-1397944 (Invention name: single stage compression freezer having a double tube heat exchanger with high efficiency, 2014. 02. 05. disclosure) Republic of Korea Patent Publication No. 10-1947679 (Invention name: high efficiency low temperature water two-stage absorption refrigerator with increased efficiency by two-stage separate heat exchange method, published on Feb. 14, 2019)

The present invention was conceived in view of the above, by using a simple device to supercool the refrigerant to remove the flash gas and to completely vaporize the refrigerant entering the compressor to improve the freezing efficiency of the freezer by smooth operation of the compressor. The purpose is to provide a highly efficient refrigeration system.

According to a preferred embodiment for achieving the above object of the present invention, the high-efficiency refrigeration system according to the present invention separates the refrigerant from the evaporator, the refrigerant is evaporated into the liquid phase and the gas phase, the first line and the liquid phase to move the gas phase refrigerant A first gas-liquid separator including a second line through which a refrigerant is moved, an ejector in which a gaseous refrigerant supplied from the first line and a liquid refrigerant supplied to the second line are mixed, a compressor in which the refrigerant mixed in the ejector is compressed; A low pressure condensed receiver for condensing the refrigerant compressed by the compressor, the refrigerant condensed by the condenser is moved, heat-exchanged and liquefied by the liquid refrigerant moving through the second line of the first gas-liquid separator, A first expansion valve for adiabatic expansion of the refrigerant moved from the low pressure condensation receiver by a throttling action, and the first expansion It may comprise an evaporator that evaporates the refrigerant expanded by the probe.

The refrigerant discharged from the condenser is heat-exchanged with the refrigerant from the ejector and is moved to the low pressure condenser, and the refrigerant from the ejector is further heat-exchanged with the refrigerant exiting from the condenser and further includes a second gas-liquid separator to be moved to the compressor. can do.

The low pressure condenser may further include a foaming accelerator for separating a large amount of refrigerant and a small amount of flash gas, and promotes vaporization of the refrigerant.

The ejector is provided with a nozzle for injecting the refrigerant flowing through the first line and the second line at high speed, and the refrigerant of the second line flowing through the heat exchange inside the low pressure condenser, the high speed of the nozzle Suction mixing by injection may be carried to the second gas-liquid separator.

A second expansion valve disposed between the second gas-liquid separator and the low pressure condensation receiver may further include a second expansion valve for adiabatic expansion of the refrigerant exchanged in the second gas-liquid separator by throttling to enter the low pressure condensation receiver. .

According to the high-efficiency refrigeration system according to the present invention, it is possible to improve the freezing efficiency of the refrigerator by removing the flash gas generated during operation of the refrigeration cycle through the supercooling of the refrigerant.

In addition, the low pressure condensation receiver, the gas-liquid separator, and the plurality of expansion valves can be used to cool the refrigerant several times to allow the supercooled to remove the flash gas more effectively.

In addition, the supercooling of the refrigerant to remove the flash gas does not change the refrigeration cycle, so there is no need to design a large condenser capacity or install an additional heat exchanger.

In addition, it is possible to increase the performance of the compressor by completely vaporizing the refrigerant entering the compressor to prevent the efficiency degradation caused by the compressor to compress the liquid refrigerant.

In addition, by controlling the rise of discharge gas temperature due to the smooth operation of the compressor, the overall operating efficiency of the compressor is increased, and the cooling system that reduces the operating time also operates, thereby improving the performance of the entire refrigeration system and reducing energy costs by reducing the power cost. Can have

1 is a view showing the configuration of a high-efficiency refrigeration system according to an embodiment of the present invention.
2 is a view showing the appearance of a refrigerator to which a high-efficiency refrigeration system is applied according to an embodiment of the present invention.
3 is a view showing a refrigerant flow of the refrigerator according to an embodiment of the present invention.
Figure 4 is a graph for explaining the effect of the high efficiency refrigeration system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a high efficiency refrigeration system according to the present invention. At this time, the present invention is not limited or limited by the embodiment. In addition, in describing the present invention, a detailed description of known functions or configurations may be omitted to clarify the gist of the present invention.

1 is a view showing the configuration of a high-efficiency refrigeration system according to an embodiment of the present invention.

Referring to Figure 1, the high efficiency refrigeration system (1) consists of a refrigeration cycle that goes through the process of compression, condensation, expansion and evaporation. The high efficiency refrigeration system (1) comprises a first gas-liquid separator (10), an ejector (20), a compressor (30), a condenser (40), a low pressure condenser (50), a first expansion valve (60A), and an evaporator ( 70).

The first gas-liquid separator 10 separates the refrigerant from the evaporator 70 in which the refrigerant is evaporated into a liquid phase and a gaseous phase, a first line L1 through which the gas phase refrigerant moves, and a second line L2 through which the liquid refrigerant moves. ).

The ejector 20 mixes a gaseous refrigerant supplied from the first line L1 and a liquid refrigerant supplied to the second line L2.

The compressor 30 compresses the refrigerant mixed in the ejector 20, and the condenser 40 condenses the refrigerant compressed by the compressor 30.

The low pressure condensed receiver 50 is the refrigerant condensed by the condenser 40 is moved, the heat exchanged by the liquid refrigerant moving the second line (L2) of the first gas-liquid separator 10 is cooled and liquefied do.

The first expansion valve (60A) is adiabatic expansion of the refrigerant moving from the low pressure condensation receiver 50 by the throttling action, the evaporator 70 is a refrigerant expanded by the first expansion valve (60A) Evaporates.

In addition, the high-efficiency refrigeration system (1) is a refrigerant exiting the condenser 40 is heat-exchanged with the refrigerant from the ejector 20 is moved to the low pressure condenser 50, the ejector 20 The refrigerant includes a second gas-liquid separator 80 that is heat-exchanged with the refrigerant exiting the condenser 40 and moved to the compressor 30.

That is, the second gas-liquid separator 80 supercools the refrigerant liquid from the condenser 40 through heat exchange, and the refrigerant from the second gas-liquid separator 80 is completely vaporized so that the compressor 30 is a liquid refrigerant. It can prevent to compress. Since the refrigerant from the second gas-liquid separator 80 is completely vaporized and enters the compressor 30, the compressor 30 may operate efficiently.

In the present embodiment, the low pressure condenser receiver 50 of the high efficiency refrigeration system 1 may include a forming accelerator 51 for separating a large amount of refrigerant and a small amount of flash gas and promoting vaporization of the refrigerant. have. The forming accelerator 51 is composed of a plurality of structures to ensure that the flash gas is well separated.

The low pressure condenser receiver 50 has a structure in which a gas-liquid heat exchanger 52 is disposed at an upper portion thereof, and the forming accelerator 51 is disposed at a lower portion thereof.

In addition, the ejector 20 is provided with a nozzle (not shown) for injecting the refrigerant flowing through the first line (L1) and the second line (L2) at high speed, the low pressure condenser 50 The refrigerant of the second line (L2) flowing through the heat exchange in the inside) may be suction-mixed by the high-speed injection of the nozzle and transferred to the second gas-liquid separator 80.

The low temperature low pressure refrigerant gas from the first gas-liquid separator 10 and the refrigerant liquid entering the gas-liquid heat exchanger 52 of the low pressure condenser are heat-exchanged with the flash gas of the low pressure condensation receiver 50, and then, from the liquid phase to the gas phase. The refrigerant in the gaseous phase may be joined to the first line L1 of the second gas-liquid separator 80 by using the ejector 20. At this time, the ejector 20 serves to smoothly send the liquid refrigerant that is not 100% gaseous to the second gas-liquid separator 80.

Here, the first gas-liquid separator 10 enters the second gas-liquid separator 80 through the first line L1 of the separated wet steam, and the liquid phase is the low pressure condensed sap through the second line L2. The gas-liquid heat exchanger 52 of the gas 50 enters into and heat-exchanges into the second gas-liquid separator 80 in the gas phase.

In addition, the residual refrigerant and the flash gas may be exchanged through the gas-liquid heat exchanger 52 of the low pressure condenser receiver 50. In the gas-liquid heat exchanger 52, the refrigerant may be exchanged and cooled. The refrigerant from the first gas-liquid separator 10 is vaporized to enter the second gas-liquid separator 80.

That is, the refrigerant from the second gas-liquid separator 80 passes through the foaming accelerator 51 of the low pressure condenser 50 and enters the evaporator 70 and the refrigerant from the first gas-liquid separator 10. After the heat exchange in the gas-liquid heat exchanger 52 of the low pressure condenser receiver 50 is entered into the second gas-liquid separator (80).

The low temperature low pressure refrigerant heat exchanged with the flash gas in the low pressure condenser receiver 50 becomes a gaseous phase, and the refrigerant gas is introduced into the first gas inlet of the second gas-liquid separator 80 through the second line L2. Will join (L1).

 In the present embodiment, the high efficiency refrigeration system (1) can be installed two expansion valves, the first expansion valve (60A) and the second expansion valve (60B) is arranged on the piping of the refrigeration system (1) do.

The first expansion valve 60A is disposed between the low pressure condenser 50 and the evaporator 70, and insulates the refrigerant heat-exchanged in the low pressure condenser 50 by a throttling action. To expand into the evaporator (70).

In addition, the second expansion valve (60B) is disposed between the second gas-liquid separator 80 and the low pressure condensed fluid receiver 50, by the throttling action of the refrigerant heat exchanged in the second gas-liquid separator (80). Adiabatic expansion to enter the low pressure condenser 50.

The refrigerant temperature difference between the first expansion valve 60A and the second expansion valve 60B has a range of approximately 10 to 15 ° C. The high temperature refrigerant expanded by the second expansion valve 60B is expanded again by the first expansion valve 60A and enters the evaporator 70 with the temperature of the refrigerant falling.

The adiabatic expansion refrigerant from the first expansion valve (A) and the second expansion valve (60B) is sent to the evaporator 70 to evaporate, and the first expansion valve (60A) and the second expansion valve (60B). Supplies an appropriate adiabatic expansion refrigerant to the evaporator 70 according to the load of the evaporator 70.

That is, the refrigerant supplied to the evaporator 70 cools the heat source on the evaporator side during the evaporation process, acquires heat, changes into a low pressure gaseous refrigerant, and enters the first gas-liquid separator 10.

Therefore, the refrigerant from the condenser 40 is first heat-exchanged in the second gas-liquid separator 80, the refrigerant is secondarily cooled while passing through the second expansion valve 60B, and the low pressure condensate The refrigerant from the gas 50 is third-cooled while passing through the first expansion valve 60A, and the refrigerant from the first gas-liquid separator 10 is the gas-liquid heat exchanger of the low pressure condenser 50. The coolant may be supercooled by heat-exchanging in 4) and by fourth cooling.

2 is a view showing the appearance of a refrigerator to which a high-efficiency refrigeration system is applied according to an embodiment of the present invention. 3 is a view showing a refrigerant flow of the refrigerator according to an embodiment of the present invention.

2 and 3, the refrigerator to which the high efficiency refrigeration system 1 is applied includes a first gas liquid separator 10, an ejector 20, a compressor 30, a condenser 40, and a low pressure condenser 50. The first expansion valve 60A, the second expansion valve 60B, and the evaporator 70 are provided.

A second gas-liquid separator 80 is disposed between the condenser 40 and the second expansion valve 60B, and a low pressure condenser 50 is disposed between the second expansion valve 60B and the first expansion valve 60A. ) Is disposed, and the first gas-liquid separator 10 is disposed between the evaporator 70 and the second gas-liquid separator 80.

A first line L1 is disposed between the first gas-liquid separator 10 and the second gas-liquid separator 80, between the first gas-liquid separator 10 and the low pressure condenser 50, and low pressure. The second line L2 is disposed between the condensation receiver 50 and the first line L1. An ejector 20 may be installed at the connection portion between the second line L2 and the first line L1.

Therefore, in the circulation structure of the refrigerant circulating in the refrigerator, first, the refrigerant liquid from the condenser 40 enters the second gas-liquid separator 80 and is heat-exchanged, thereby separating the refrigerant in the gas phase into the liquid refrigerant, and the refrigerant liquid. After the throttle expansion in the second expansion valve (60B), the low pressure condensed receiver 50 passes through the throttle expansion in the first expansion valve (60A). The expanded refrigerant is supplied to the evaporator (70).

The refrigerant from the evaporator 70 enters the first gas-liquid separator 10, and the liquid refrigerant is heat-exchanged in the gas-liquid heat exchanger 52 of the low pressure condenser 50 along the second line L2. Refrigerant enters the second gas-liquid separator 80 along the first line.

The refrigerant heat-exchanged in the low pressure condenser receiver 50 is supplied to the second gas-liquid separator 80 along the second line L2. At this time, the ejector 20 is installed at the point where the second line L2 and the first line L1 meet, and the low pressure gaseous refrigerant flowing through the gas-liquid heat exchanger 52 flows into the ejector 20 at high speed. Inhalation and mixing are carried out by injection, and are transferred to the second gas-liquid separator 80.

The refrigerant entering the second gas-liquid separator 80 is sequentially supplied to the compressor 30 and the condenser 40 through a pipe.

Figure 4 is a graph for explaining the effect of the high efficiency refrigeration system according to an embodiment of the present invention.

Referring to FIG. 4, (a) illustrates a conventional refrigeration cycle of a refrigerator. When the refrigerant is overcooled by section A, the load of section B is applied to the refrigerator. In order to eliminate the load of B, the capacity of the condenser forming the refrigeration system must be designed large or additionally a heat exchanger must be installed.

(b) shows the refrigeration cycle of the refrigerator using the high-efficiency refrigeration system of the present invention, even if the refrigerant is overcooled by section C (h₂-h)), it can be seen that the overload (h₂'-h₁ ') is hardly applied to the refrigerator. .

In addition, (b) shows the dryness in order to show the heat exchange efficiency of the refrigerant liquid, and the dryness indicates the vapor in the water vapor. The dryness of 1 is a complete gas containing no liquid refrigerant, the dryness of 0.1 is 10% of steam, and the remainder is a mixed state of the liquid refrigerant.

That is, if the dryness is x, x = 0 in saturated liquid and x = 1 in dry saturated steam.

The dryness formula based on this can be expressed as hx = h₁ + (h₂'-h₁ ') x. Based on the above formula, it is possible to suppress the rise of the discharge gas temperature of the compressor 10 by condensing the flash gas with only a small amount of refrigerant liquid. (H: enthalpy, x: dryness)

Therefore, the refrigeration efficiency of the refrigerator can be improved by removing the flash gas generated during operation of the refrigeration cycle of the refrigerator by the subcooling of the refrigerant by the high efficiency refrigeration system 1.

In addition, the low pressure condensed receiver 50, the gas-liquid separator, and a plurality of expansion valves by cooling the refrigerant several times to be able to remove the flash gas more effectively.

In addition, the supercooling of the refrigerant to remove the flash gas does not change the refrigeration cycle, so it is not necessary to design a large capacity of the condenser 40 or to install an additional heat exchanger.

In addition, the performance of the compressor 30 may be improved by completely vaporizing the refrigerant entering the compressor 30, thereby preventing a decrease in efficiency caused by the compressor 30 compressing the liquid refrigerant.

In addition, by controlling the rise of the discharge gas temperature by the smooth operation of the compressor (30) to improve the overall operating efficiency of the compressor (30), operating the cooling system to reduce the operating time, thereby improving the performance of the entire refrigeration system and power costs It can have an energy saving effect by reduction.

While the invention has been shown and described in connection with preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

1: refrigeration system 10: first gas-liquid separator
20: ejector 30: compressor
40: condenser 50: low pressure condenser
51: forming accelerator 52: gas-liquid heat exchanger
60A: first expansion valve 60B: second expansion valve
70: evaporator 80: second gas-liquid separator
L1: first line L2: second line

Claims (5)

A refrigeration system consisting of a refrigeration cycle that undergoes compression, condensation, expansion and evaporation.
A first gas-liquid separator that separates the refrigerant from the evaporator into which the refrigerant is evaporated, into a liquid phase and a gaseous phase, and includes a first line through which the gaseous refrigerant moves and a second line through which the liquid phase refrigerant moves;
An ejector in which a gaseous refrigerant supplied from the first line and a liquid refrigerant supplied to the second line are mixed;
A compressor in which the refrigerant mixed in the ejector is compressed;
A condenser for condensing the refrigerant compressed by the compressor;
A low pressure condenser receiver, in which a refrigerant condensed by the condenser is moved, heat exchanged by a liquid refrigerant moving in a second line of the first gas-liquid separator, and cooled to liquefy;
A first expansion valve for adiabatic expansion of the refrigerant moved from the low pressure condenser; And
And an evaporator through which the refrigerant expanded by the first expansion valve evaporates. The method of claim 1,
The second gas-liquid separator is heat exchanged with the refrigerant from the condenser is transferred to the low pressure condenser receiver, the refrigerant from the ejector is heat exchanged with the refrigerant from the condenser and moved to the compressor; High efficiency refrigeration system comprising a. The method according to claim 1 or 2,
The low pressure condenser receiver further comprises a foaming accelerator for separating a large amount of refrigerant and a small amount of flash gas, and promoting the vaporization of the refrigerant. The method of claim 3, wherein
The ejector,
A nozzle for injecting the refrigerant flowing through the first line and the second line at high speed is installed, and the refrigerant of the second line flowing through the heat exchange in the low pressure condenser is injected by the high speed injection of the nozzle. A high-efficiency refrigeration system characterized in that the suction and conveyed to the second gas-liquid separator. The method of claim 3, wherein
High efficiency refrigeration further comprising a second expansion valve disposed between the second gas-liquid separator and the low pressure condensation receiver, and adiabatic expansion of the refrigerant heat exchanged in the second gas-liquid separator by throttling action to enter the low pressure condensation receiver. system.

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