KR20150067639A - The defrost system for an evaporator of a cold storage - Google Patents

Abstract

The present invention provides a defrosting system for an evaporator of a frozen storage capable of improving the efficiency of energy required for defrosting. The defrosting system for an evaporator of a frozen storage comprises: an evaporator (110) installed inside a storage (200); a compressor (120) to compress a refrigerant (C) evaporated in the evaporator (110); a vortex generation part (130) to swirl the high temperature and pressure gaseous refrigerant (C) compressed by the compressor (120) in an inner wall at a time when the refrigerant is transferred such that the heat energy of the high temperature and pressure gaseous refrigerant (C) can be discharged to an outer wall; a condenser (140) to condense the refrigerant (C) passing the vortex generation part (130); an expansion valve (150) installed between the condenser (140) and the evaporator (110) to expand the refrigerant (C) condensed by the condenser (140); a heat exchange part (160) to heat a defrosting solution (F) by directly transferring heat to the high temperature and pressure refrigerant (C) swirled in the vortex generation part (130); and a defroster (170) having passages (FL1, FL2) through which the defrosting solution (F) heated by the heat exchange part (160) is circulated to the heat exchange part (160) after being sprayed to the evaporator (110).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrost system for an evaporator,

The present invention relates to a defrosting system for an evaporator for a freezer warehouse, and more particularly, to a defrosting system installed to remove a defroster, which can increase the efficiency of a condenser and a compressor and minimize the consumption of additional power by a defrost system And to develop a defrosting system for a freezer depot developed for the purpose of improving the performance of the evaporator.

Generally, a refrigeration facility for cooling the inside air of a cold storage compartment generates cold air through a physical phase transition of a refrigerant circulated by a closed circuit refrigeration cycle including a compressor, a condenser, an expansion valve, and an evaporator. When a refrigerant liquefied at a low temperature and a low pressure while passing through the expansion valve is supplied to the evaporator, the refrigerant absorbs the latent heat of vaporization in the course of vaporization from the hot air around the evaporator, thereby cooling the ambient air. At this time, the moisture contained in the air around the evaporator is condensed on the surface of the evaporator to form a gaseous state, which causes a deterioration in the heat exchange performance of the evaporator and inefficiency of the entire power plant.

In order to solve such a problem, it is necessary to remove the gaps formed in the evaporator, i.e. defrost. The methods of defrosting in cold storage warehouses include a method of natural defrosting by stopping the operation of the refrigerator for a certain period of time, a hot gas evaporation method in which hot gas is introduced, an electric heater is installed in the evaporator, A method of removing the water by spraying, and the like.

In the case of a commercial cooling apparatus requiring a large amount of cooling, it is necessary to maintain a constant cooling cycle, so that the natural gas discharge method, the hot gas discharge method and the electrothermal discharge method are not suitable discharge methods. Since these refrigeration methods stop the compressor during the defrosting operation of the evaporator, the temperature of the storage compartment is inevitably increased due to the refrigerating and freezing functions of the evaporator being stopped until the defrosting operation is completed. Accordingly, There are various troublesome problems to be carried out in defrosting the refrigerated warehouse after moving the stored goods to another refrigerator warehouse.

In order to solve this problem, according to Japanese Patent No. 981447, the cooling function is maintained even during the defrosting operation, and the heat generated by the condenser is recovered by using the heat energy used for the defrosting operation, The warehouse is being opened.

According to the present invention, the air sucked by the fan unit passes through the first heat exchanger or the second heat exchanger, and the moisture in the air is removed to cool the inside air of the storage compartment. And the other heat exchanger in which air is selectively passed through any one of the first heat exchanger and the second heat exchanger to perform defrosting operation can be continuously cooled .

However, even in this case, since the moisture in the air can not be completely removed, there is a problem that the defrosting operation must be additionally performed after the cooling cycle is stopped in practice.

In addition, there is a problem in that energy efficiency is low due to separately supplying an energy source necessary for the defrosting operation in the conventional case, and the efficiency of cooling the evaporator is reduced by the evaporator performed simultaneously with the defrosting operation.

Accordingly, it is an object of the present invention to provide a defrost system for an evaporator for a freezer storage which can improve the energy efficiency required for defrosting.

It is another object of the present invention to provide a defrost system for an evaporator for a freezer warehouse which can improve the cooling efficiency without causing deterioration of the evaporator due to defrosting.

According to the present invention, there are provided an evaporator 110 installed inside the storage 200, a compressor 120 for compressing the refrigerant C evaporated in the evaporator 110, a high-temperature high-pressure A vortex generating part 130 for vortexing at the inner wall when the gaseous refrigerant C is conveyed to allow the thermal energy of the gaseous coolant C at high temperature and high pressure to be discharged to the outer wall, An expansion valve 150 installed between the condenser 140 and the evaporator 110 for expanding the refrigerant C condensed in the condenser 140, a vortex generator 130 installed between the condenser 140 and the evaporator 110, A heat exchanging unit 160 for heating the defrosting liquid F by direct heat transfer to the high temperature and high pressure refrigerant C circulated in the evaporator 110 (170) having flow passages (FL1, FL2) circulated to the heat exchanger (160) The warehouse evaporator defrost system is provided.

The vortex generating unit 130 includes a recessed portion 132 and a concave and convex portion 134 having a cross section in which the internal and external diameters periodically change between the flow paths through which the gaseous refrigerant C of high temperature and high pressure compressed from the compressor 120 passes, .

The outer circumferences of the recessed portion 132 and the concave and convex portion 134 of the vortex generation portion 130 form a spiral circular shape in the longitudinal direction of the vortex generation portion 130. The heat exchange portion 160 has a vortex generation portion 130 And a channel FL wound along the spiral circular shape of the outer periphery of the recessed and protruded portions 134. [

The first and second valves 180 and 190 are installed between the first and second flow paths FL1 and FL2 and the heat exchange unit 160 through which the defrost liquid F flows into and out of the first and second flow paths 170 and 170, A pump PUMP for transferring the defrost liquid F from the heat exchanging unit 160 to the first valve 170 and a first valve 180 and a second valve 190 for driving the compressor 120, The first and second valves 180 and 190 close the flow path of the defrosting liquid F circulated to the defrosting line 170 and the defrosting liquid F And a control unit CONT for opening the flow path.

The first and second valves 180 and 190 are three-way valves and the defrost liquid F is supplied between the first three-way valve 180 and the second three-way valve 190 through the first and second three- And a third flow path FL3 forming a closed flow path circulated to the heat exchanging part 160 by opening the first and second flow passages 180 and 190. [

When the drive signal SL4 of the compressor 120 is input, the controller CONT also enters the heat exchanger 160 via the third flow path FL3, and the defrost liquid F from the heat exchanger 160 And outputs the control signals SL1 and SL2 for circulation to the first and second three-way valves 180 and 190. When the drive signal SL4 of the compressor 120 is not input, And outputs a control signal SL3 for driving the pump PUMP such that the defrost liquid F is injected from the injection nozzle 172 of the nozzle 170 via the first flow path FL1, It is preferable that the three-way valves 180 and 190 output control signals SL1 and SL2 for controlling the defrost liquid F not to pass through the circulating flow path for the third flow path FL3.

Therefore, according to the present invention, the effective heat transfer area with the defrost liquid is maximized in the region where the refrigerant compressed at high temperature and high pressure is swept by the compressor, thereby reducing the defrost energy, and the defrost liquid in the cooling cycle is circulated to have a heat transfer process The defrosting liquid is sprayed to the evaporator when not in the cooling cycle, so that the cooling efficiency of the evaporator can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating a defrosting system of an evaporator for a freezer according to a preferred embodiment of the present invention; FIG.
Fig. 2 is an enlarged cross-sectional view of the portion A in Fig. 1. Fig.
3 is a graph illustrating the operation of the defrosting system for the freezer depot according to the preferred embodiment of the present invention.

Hereinafter, a defrosting system for an evaporator for a freezer according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic conceptual view of a defrost system of a freezer storage evaporator according to a preferred embodiment of the present invention. FIG. 2 is an enlarged sectional view of a portion A in FIG. 1, and FIG. 3 is a cross- FIG. 4 is a graph showing the operation of the evaporator for a freezing depot according to the present invention.

1 to 3, the defrost system of the evaporator for a freezing depot according to a preferred embodiment of the present invention is installed inside a storage 200 for storing food ingredients, and evaporates the refrigerant C, (120) for compressing the refrigerant (C) evaporated in the evaporator (110), a high-temperature high-pressure high-pressure A vortex generating part 130 for vortexing at the inner wall when the gaseous refrigerant C in the gaseous phase is conveyed to cause the thermal energy of the gaseous coolant C at high temperature and high pressure to be released to the outer wall, A condenser 140 for condensing the refrigerant C, an expansion valve 150 installed between the condenser 140 and the evaporator 110 for expanding the refrigerant C condensed in the condenser 140, (C) of high temperature and high pressure swirling in the refrigerant circuit (130) And a defrosting liquid F which is heated by the heat exchanging unit 160 is sprayed to the evaporator 110 and is then discharged to the heat exchanging unit 160. The heat exchanging unit 160 discharges the defrosting liquid F, (170) having circulating flow paths (FL1, FL2).

The first and second valves 180 and 190 are installed between the first and second flow paths FL1 and FL2 and the heat exchange unit 160 through which the defrost liquid F flows into and out of the first and second flow paths 170 and 170, A pump PUMP for transferring the defrost liquid F from the heat exchanging unit 160 to the first valve 170 and a first valve 180 and a second valve 190 for driving the compressor 120, The first and second valves 180 and 190 close the flow path of the defrosting liquid F circulated to the defrosting line 170 and the defrosting liquid F And a control unit CONT for opening the flow path.

In this case, the first and second valves 180 and 190 are three-way valves, and the defrost liquid F is supplied between the first three-way valve 180 and the second three- The controller CONT further includes a third flow path FL3 forming a closed flow path circulated to the heat exchanging unit 160 by opening the valves 180 and 190. The control unit CONT controls the flow of the driving signal SL4 The first and second three-way valves 180 and 190 are controlled so that the defrost liquid F from the heat exchanger 160 is input to the heat exchanger 160 via the third flow path FL3 when the control signal The defrosting liquid F from the heat exchanging unit 160 is discharged through the first flow path FL1 when the drive signal SL4 of the compressor 120 is not inputted, The first and second three-way valves 180 and 190 output the control signal SL3 for driving the pump PUMP such that the defrost liquid F is injected from the third flow path FL3) via a circulating flow path And it outputs a control signal (SL1, SL2) for controlling prevents paper. The defrosting liquid F injected from the injection nozzle 172 of the nozzle 170 is operated only when the compressor 120 is not driven and when the compressor 120 is driven, The liquid F is circulated along the closed circulation flow path formed by the second flow path FL3 and receives the high temperature energy of the refrigerant C according to the operation of the compressor 120. [

By improving the operation efficiency of the evaporator 110 while the refrigerant compressed at high temperature and high pressure by the compressor 120 passes through the circulation cycle of the refrigerant by this operation cycle, the energy efficiency of the refrigerating efficiency of the storage 200 is improved At the same time, energy efficiency due to defrosting can be improved.

The vortex generating part 130 includes a recessed part 132 and a concave and convex part 134 having a cross section whose internal and external diameters periodically change between flow paths through which the gaseous refrigerant C of high temperature and high pressure compressed from the compressor 120 passes, (The solid line arrows in FIG. 2 indicate the movement of the defrost liquid F, and the dotted arrows indicate the movement of the refrigerant C).

The outer circumferences of the recessed portion 132 and the concave and convex portion 134 of the vortex generating portion 130 form a spiral circular shape in the longitudinal direction of the vortex generating portion 130. The heat exchanging portion 160 forms a circular arc shape, And a channel FL wound along the spiral circle of the outer periphery of the recessed portion 134 and the recessed portion 132. A heat insulating material 136 and a casing 138 for shielding the heat energy emitted to the outside from the pipe line wound like this are provided.

Temperature and high-pressure gaseous refrigerant C passing through the recessed portion 132 and the concave-convex portion 134 of the vortex generating portion 130 forms a vortex in the course of passage, and the passage of time is delayed and the heat exchange portion 160 ), The energy efficiency required for defrosting can be improved more efficiently.

Accordingly, the defrost liquid F has a larger heat exchange effective area for the refrigerant compressed to a high temperature and a high pressure by the compressor 120, and performs heat exchange in a state where the compressed refrigerant of high temperature and high pressure is vortexed and moved, The heat exchange efficiency between the refrigerant C that has passed through the heat exchanger 120 and the defrost liquid F that is heat-exchanged therewith can be greatly improved.

In addition, the controller CONT controls the first and second three-way valves 180 and 180 in the process of cooling the air in the storage 200 by the evaporator 110 because the compressor 120 is driven and the refrigerant C has a cooling cycle. Way valve 190 so that the defrost liquid F does not transfer to the evaporator 110 but has a circulation loop for heat exchange with the high temperature and high pressure refrigerant C generated by the driving of the compressor 120, Thereby improving the cooling efficiency of the storage 200 by the cooling fan 110. The control unit CONT controls the first three-way valve 180 and the second three-way valve 190 so that the high-temperature energy (high-temperature energy) So that the defrost liquid F is transferred to the evaporator 110 and the pump PUMP is driven so that the defrost liquid F is circulated to the evaporator 110, The defrosting operation is performed for the defrosting unit 110 so that the energy efficiency required for defrosting can be improved.

C: Refrigerant
F: defrost liquid
FL1: First Euro
FL2:
FL3: Third Euro
SL1, SL2, SL3: control signal
CONT:
PUMP: Pump
110: Evaporator
120: Compressor
130: vortex generator
132:
134:
136: Insulation
138: casing
140: condenser
150: expansion valve
160: Heat exchanger
170:
172: injection nozzle
180: first three-way valve
190: second three-way valve
200: Storage room

Claims (6)

An evaporator 110 installed inside the storage 200;
A compressor 120 for compressing the refrigerant C evaporated in the evaporator 110;
A vortex generating unit 130 for vortexing at the inner wall when the high temperature and high pressure gaseous refrigerant C compressed by the compressor 120 is conveyed to cause the thermal energy of the gaseous refrigerant C of high temperature and high pressure to be discharged to the outer wall;
A condenser 140 for condensing the refrigerant C that has passed through the vortex generating unit 130;
An expansion valve (150) installed between the condenser (140) and the evaporator (110) for expanding the refrigerant (C) condensed in the condenser (140);
A heat exchange unit 160 for heating the defrost liquid F by direct heat transfer to the high temperature and high pressure refrigerant C which is swirled in the vortex generating unit 130; And
(170) having flow paths (FL1, FL2) circulated to the heat exchanger (160) after spraying the defrost liquid (F) heated by the heat exchanger (160) The defrosting system of the evaporator for freezing storage. The vortex generator according to claim 1, wherein the vortex generator (130) comprises a recessed portion (132) having a cross section whose internal and external diameters periodically change between flow paths through which the gaseous refrigerant (C) of high temperature and high pressure compressed from the compressor (120) (134). ≪ Desc / Clms Page number 24 > The heat exchange unit (160) according to claim 2, wherein the outer circumferences of the recessed portion (132) and the concave and convex portion (134) of the vortex generation unit (130) form a spiral circular shape in the longitudinal direction of the vortex generation unit And a pipeline (FL) wound along a spiral circular shape of an outer periphery of the recessed portion (134) and the recessed portion (132) of the generating portion (130). 4. The fuel cell system according to any one of claims 1 to 3, further comprising first and second flow paths (FL1, FL2) through which the defrost liquid (F) flows into and out of the heat exchanging section (160) A pump PUMP for transferring the defrost liquid F from the heat exchanger 160 to the first reservoir 170 and a pump PUMP for transferring the defrost liquid F from the heat exchanger 160 to the first and second valves 180, 2 valves 180 and 190 closes the flow path of the defrost liquid F circulated to the valve 170 and allows the first and second valves 180 and 190 to be closed Further comprising a control part (CONT) for opening the flow path of the defrost liquid (F) circulated to the evaporator (170). 5. The fuel cell system according to claim 4, wherein the first and second valves (180, 190) are three-way valves, and the defrost liquid (F) Further comprising a third flow path (FL3) forming a closed flow path circulated to the heat exchange section (160) by opening the second three-way valve (180, 190). 6. The compressor of claim 5, wherein the defrosting liquid (F) from the heat exchanger (160) when the drive signal (SL4) of the compressor (120) is input is supplied to the heat exchanger The control signals SL1 and SL2 are input to the first and second three-way valves 180 and 190 to allow the refrigerant to flow into the heat exchanging unit 160 when the driving signal SL4 of the compressor 120 is not input. And outputs a control signal SL3 for driving the pump PUMP such that the defrost liquid F discharged from the first passage 160 is injected from the injection nozzle 172 of the first passage 170 via the first passage FL1, Wherein the first and second three-way valves (180, 190) output control signals (SL1, SL2) for preventing the defrost liquid (F) from passing through the circulating flow path for the third flow path (FL3) Defrosting system of evaporator for warehouse.

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