KR20110113548A - Refrigeration warehouse for energy saving - Google Patents

Abstract

The present invention relates to an energy-saving refrigerated freezer, and more particularly, it is possible to save energy by recovering heat generated from the condenser and using heat energy used in the defrosting operation while maintaining the cooling function even during the defrosting operation. It is about a refrigerated freezer.
The present invention is installed in the reservoir, and the inside of the reservoir and the heat exchange medium heat exchange with the air to absorb the latent heat of evaporation, and installed in the front of the evaporator to blow the air in the reservoir from the rear of the evaporator to the front A fan unit through which the evaporator passes, a compressor for compressing the heat exchange medium evaporated by the evaporator, a condenser for condensing the heat exchange medium of the gaseous phase compressed by the compressor, and installed between the condenser and the evaporator. Cooling means including an expansion valve for expanding the heat exchange medium condensed in the condensation unit, and dehumidifying means for removing moisture in the air flowing in the evaporator direction.

Description

Energy-saving refrigerated warehouses {Refrigeration warehouse for energy saving}

The present invention relates to an energy-saving refrigerated freezer, and more particularly, it is possible to save energy by recovering heat generated from the condenser and using heat energy used in the defrosting operation while maintaining the cooling function even during the defrosting operation. It is about a refrigerated freezer.

In general, a refrigeration system for cooling the internal air of the refrigerated freezer warehouse generates cold air through the physical phase transition of the refrigerant circulated by a closed loop refrigeration cycle including a compressor, a condenser and an expansion valve and an evaporator.

That is, when the refrigerant liquefied at low temperature and low pressure while passing through the expansion valve is applied to the evaporator, the latent heat of evaporation is absorbed in the process of evaporating from the hot air in the surroundings, thereby ultimately cooling the surrounding air. At this time, frost is formed as moisture contained in the air around the evaporator condenses on the surface of the evaporator. As a result, the heat exchange performance of the evaporator is deteriorated, and the power consumption efficiency of the refrigeration plant is lowered.

In order to solve this problem, defrost is required to remove the frost formed in the evaporator.

Defrosting methods in refrigerated freezer warehouses include a method of natural defrosting by stopping the operation of the refrigerator for a certain time, a hot gas defrosting method in which hot gas is introduced to melt, and an electric heater installed in the evaporator for a predetermined time. Electrothermal defrosting method of supplying electricity at intervals, a method of spraying water to remove.

Korean Patent Publication No. 97845 (October 10, 2005 publication) discloses a conventional defrosting technology. The disclosed prior art proposes to increase the defrosting efficiency and to prevent the temperature rise of the storage compartment, thereby ultimately lowering the power consumption.

However, the disclosed prior art has no choice but to stop the operation of the compressor during the defrosting mode, that is, during the defrosting operation of the evaporator, which results in a problem that the temperature of the storage compartment is inevitable because the refrigeration and freezing functions of the evaporator are stopped until the defrosting operation is completed. have.

As a result, various detrimental problems of moving goods stored in a cold storage to another cold storage during defrosting and then performing defrosting of the corresponding cold storage, that is, transportation of labor, labor costs and defrosting time, etc. The same problem cannot be solved at all.

In particular, since the defrosting apparatus according to the prior art uses the same form as the electric heater that is generated by the power supplied from the outside, there is a problem that additional energy for defrosting is additionally consumed.

The present invention was created to improve the above problems, the refrigeration warehouse is able to save energy by recovering the heat generated from the condenser while using the heat energy used in the defrosting operation while maintaining the cooling function during the defrosting operation. The purpose is to provide.

An energy-saving refrigerated refrigerator warehouse of the present invention for achieving the above object is a storage compartment in which food materials can be stored; An evaporator installed inside the reservoir and having a heat exchange medium to exchange heat with air to absorb the latent heat of evaporation, and a fan installed in the front of the evaporator to blow air in the reservoir from the rear of the evaporator to the front to pass the evaporator. A unit, a compressor for compressing the heat exchange medium evaporated in the evaporator, a condenser for condensing the heat exchange medium in the gaseous phase compressed by the compressor, and a condensation unit provided between the condenser and the evaporator. Cooling means including an expansion valve for expanding the heat exchange medium; And dehumidifying means for removing moisture in the air flowing in the evaporator direction, wherein the condensing unit connects the tubular cooling tank installed outside the reservoir, the cooling water supply line to which cooling water is supplied, and the cooling tank. A cooling water inlet pipe for introducing the cooling water into the inside, a cooling coil accommodated in the cooling tank, and a heat exchange medium of the gaseous phase compressed by the compressor, for exchanging heat with the cooling water, and hot water heated by the heat exchange medium in the cooling tank. It is provided with a hot water outlet pipe is discharged and installed with a water temperature sensor for sensing the temperature, and a flow control valve installed in the cooling water inlet pipe to adjust the amount of cooling water flowing through the cooling water inlet pipe in accordance with the output signal of the water temperature sensor It is characterized by.

The dehumidifying means is installed on the rear side of the evaporator and a housing formed with a passage through which air can pass, and formed to cross the passage of the housing horizontally so as to partition the passage into a first flow path and a second flow path. First and second heat exchangers installed in the partition wall, the first flow passage and the second flow passage, respectively, to condense air passing through the first flow passage and the second flow passage, and installed in the housing; An intermittent portion for selectively opening any one of the flow passages, and a defrost portion for removing frost formed in the first and second heat exchangers, wherein the defrost portion is connected to the hot water outlet pipe to form an interior of the housing. A connection line extending to the first and second spray nozzles connected to the connection line and installed on the first and second heat exchangers, respectively; A pump configured to transfer hot water discharged from the cooling tank to the first and second spray nozzles, the intermittent portion comprising a pair of guide rails disposed above and below the first flow path and the second flow path, and the housing. Inserted into the inlet hole formed in the side of the upper and lower end is supported on the guide rails and having a first and a second door for opening and closing the first and second flow paths, respectively, sliding along the guide rail It is done.

According to the present invention described above, the air sucked by the fan unit removes moisture from the air while passing through the first heat exchanger or the second heat exchanger, which is a dehumidifying means, thereby preventing the formation of frost on the evaporator that cools the internal air of the reservoir. Can be reduced.

In addition, the present invention allows the defrosting operation in the other heat exchanger that does not pass the air at the same time to selectively pass the air to any one of the first heat exchanger and the second heat exchanger, so the refrigeration and freezing function of the evaporator is stopped. It can be operated continuously.

And it is possible to save energy by using hot water generated in the condensation unit to remove the frost during the defrosting operation.

1 is a schematic view showing the configuration of a refrigerated refrigerator warehouse according to an embodiment of the present invention,
Figure 2 is a perspective view of the main portion of Figure 1,
3 is a perspective view showing a heat radiation fin applied to FIG. 1,
Figure 4 is a schematic diagram showing the configuration of a refrigerated freezer according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail for the energy-saving refrigerated freezer according to a preferred embodiment of the present invention.

1 to 3, the refrigerated freezer according to an embodiment of the present invention is largely provided with a reservoir (1), a cooling means, and a dehumidifying means.

Storage 1 is a place for storing various food ingredients therein, the bottom surface, the insulating wall provided with a heat insulating material therein, and the ceiling. Since the storage 1 is the same as a conventional refrigeration or freezing warehouse, a detailed description thereof will be omitted. Of course, a container can be used as the storage 1. The size and shape of the reservoir 1 can be changed in various ways.

The cooling means cools the internal air of the reservoir 1 in order to refrigerate or freeze the foodstuffs stored in the reservoir 1. The cooling means is, for example, an evaporator 10 in which a heat exchange medium exchanges heat with air inside a reservoir to absorb latent heat of evaporation, and is installed at the front of the evaporator 10 and the air inside the reservoir 1 is rearward of the evaporator 10. Fan unit 3 which blows to the front and passes the evaporator 10, a compressor 13 which compresses the heat exchange medium evaporated in the evaporator 10, and a heat exchange medium of the gaseous phase compressed by the compressor 13 Condensation unit 20 for condensation, and expansion valve 15 for expanding between the condensation unit 20 and the evaporator 10 to expand the heat exchange medium condensed in the condensation unit 20. The evaporator 10 and the fan unit 3 are installed on the ceiling of the reservoir 1. The evaporator 10 and the fan unit 10 are built in the case 2. The case 2 is fixed to the support frame 4 supported on the ceiling.

The cooling means flows along the circulation pipe 5 through which the heat exchange medium forms a closed circuit, and the heat exchange medium in the gas state is compressed by the compressor 13 and discharges the heat of condensation from the condenser 20 through the oil separator 17. After the condensation, it expands to low pressure in the expansion valve (15) through the receiver (18), dry (19) and the intermediate valve (7), evaporated to a gas state in the evaporator (10) and then back to the compressor (13) A recirculating closed loop refrigeration cycle is achieved. Since the cooling means differs only in the structure of the condensation unit 20, and other than the conventional refrigeration apparatus, a detailed description thereof will be omitted.

Condensation unit 20 applied to the present invention is configured to use the heat energy generated during the condensation of the heat exchange medium of the gas phase compressed by the compressor 13 in the defrosting operation.

In the illustrated example, the condensation unit 20 is connected to a tubular cooling tank 21 installed outside the reservoir 1, a cooling water supply line (not shown) to which cooling water is supplied, and a cooling tank 21 by connecting the cooling tank 21. (21) The cooling water inlet pipe 23 for introducing the cooling water into the inside, the cooling coil 25 accommodated in the cooling tank 21, and the hot water heated by the heat exchange medium in the cooling tank 21 flows out. The amount of coolant flowing through the coolant inlet tube 23 is installed in the hot water outlet tube 27 and the coolant inlet tube 23 installed to detect the water temperature sensor 28. It is provided with the flow regulating valve 24 to adjust. The hot water outlet pipe 27 is connected to the connection line 30 extending into the reservoir 27.

The cooling coil 25 is installed in the middle of the circulation pipe 5 through which the heat exchange medium flows. Therefore, the heat exchange medium compressed by the compressor 13 passes through the cooling coil 25. The high temperature and high pressure heat exchange medium via the cooling coil 25 exchanges heat with the cooling water introduced into the cooling tank 21 to release the condensation heat to the cooling water. Therefore, the cooling water introduced through the cooling water inlet tube 23 absorbs the heat energy emitted from the heat exchange medium and is heated, that is, the hot water is discharged to the outside of the cooling tank 21 through the hot water outlet tube 27. At this time, the water temperature sensor 28 detects the temperature of the hot water discharged through the hot water outlet pipe 27, the flow control valve 24 is passed through the cooling water inlet pipe 23 in accordance with the output signal of the water temperature sensor 28 Adjust the amount of coolant. That is, the flow rate control valve 24 reduces the amount of cooling water introduced through the coolant inlet pipe 23 when the temperature of the discharged hot water falls below a predetermined temperature, and the cooling water introduced when the temperature of the discharged hot water rises above a predetermined temperature. Increase the amount of Control of the flow regulating valve 23 can be controlled by a conventional controller (not shown).

And a heat storage tank 31 for storing hot water is installed between the hot water outflow pipe 27 and the connection line 30. The hot water stored in the heat storage tank 31 is used during the defrosting operation. The heat storage tank 31 is formed in a cylindrical shape so that hot water is filled therein. The outer surface of the heat storage tank 31 may have a structure surrounding the heat insulating material for insulating, the case surrounding the heat insulating material.

Meanwhile, as shown in FIG. 4, it is preferable to include an auxiliary heat source supply unit for supplying an auxiliary heat source to hot water flowing out of the cooling tank 21. This auxiliary heat source supply unit provides the auxiliary heat source for the hot water when the hot water does not reach a temperature sufficient for defrosting.

The heat storage tank 31, the first hot water oil passage line 33 extending from the heat storage tank 31, and the first hot water oil passage line 33 are connected to the inlet port as an auxiliary heat source supply unit, and the first hot water oil passage line 33 is provided. Hot water introduced through the heat collecting plate 35 to absorb heat from the solar heat, and the second hot water oil passage line 37 extending from the outlet of the heat collecting plate 35 and connected to the heat storage tank (31).

Although not shown, the heat storage tank 31 is provided with a water temperature sensor for sensing the temperature of hot water. In addition, valves 34 and 38 are provided to open and close the passages of the first hot water oil passage line 33 and the second hot water oil passage line 37, respectively, according to the output signal of the water temperature sensor. A circulation pump 39 for circulating hot water through the first hot water diesel line 33 to the heat collecting plate 35 is installed in the first hot water diesel line 33.

Therefore, when the hot water stored in the heat storage tank 31 is at a predetermined temperature, for example, 30 to 40 degrees or less, the valves 34 and 38 installed in the first and second hot water oil passage lines 33 and 37 are controlled by the controller. Simultaneously with opening, the circulation pump 39 is operated. Accordingly, the hot water stored in the heat storage tank 31 is circulated through the first hot water diesel line 33, the heat collecting plate 35, and the second hot water diesel line 37. And it absorbs the solar heat in the process of passing through the heat collecting plate 35 is heated.

As described above, the present invention can reduce the energy used for the defrosting operation by using the heat energy required for the defrosting operation using heat emitted from the heat exchange medium and the solar heat as an auxiliary heat source.

On the other hand, the present invention is to first remove the moisture in the air from the dehumidification means in order to prevent the frost is formed in the evaporator 10 for cooling the internal air of the reservoir (1) to the evaporator (10) It has a configuration to pass.

The dehumidification means applied to the present invention comprises a housing 50, a partition wall 51, first and second heat exchangers 60 and 70, an intermittent part, and a defrost part.

The housing 50 is installed at the rear of the evaporator 10. The upper portion of the housing 50 is fixedly installed on the support frame 4 supported on the ceiling. The housing 50 has a rectangular cylindrical shape and has a structure in which a passage through which fluid flows and an open front and rear surfaces. Therefore, the air sucked by the fan unit 3 flows into the rear of the passage of the housing 50 and flows along the passage. The air passing through the passage is blown forward by the fan unit 3 via the evaporator 10.

The passage formed in the housing 50 by the partition walls 51 provided in the housing 50 is divided into first and second flow paths 53 and 55. The partition wall 51 is installed to traverse the passage horizontally at the middle height of the housing 50. Therefore, the first flow path 53 is formed above the partition 51, and the second flow path 55 is provided below the partition 51.

In addition, first and second heat exchangers 60 and 70 are installed in the first channel 53 and the second channel 55, respectively.

The first heat exchanger 60 includes a plurality of heat transfer fins 61 and a heat exchange pipe 63 installed to penetrate the heat transfer fins 61. The heat transfer fin 61 has a structure in which a plate-like member is bent in a wave form. The heat transfer fin 61 uses copper having high thermal conductivity. Each heat transfer fin 61 is formed with a plurality of insertion holes 65 through which the heat exchange pipe 63 passes. The heat transfer fins 61 are disposed in the first flow path 53 at regular intervals.

The heat exchange pipe 63 is made of copper material. The heat exchange pipe 63 is formed to zigzag through the insertion hole 65 formed in each heat transfer fin 61. The heat exchange pipe is connected to the first branch pipe 81 branched from the circulation pipe 5. Therefore, a part of the heat exchange medium flowing along the circulation pipe 5 passes through the heat exchange pipe 63. The first branch pipe 81 via the heat exchange pipe 63 is connected to the circulation pipe 5 at the front point of the compressor 13.

Preferably, the heat transfer fin 61 is provided with a distribution hole 69 formed around the insertion hole 65 and the collision rib 67. Air introduced into the empty space between the heat transfer fins 61 through the distribution hole 69 may be distributed between adjacent heat transfer fins. The collision ribs 67 formed at the edges of the respective distribution holes 69 protrude out of the distribution holes 69. The collision ribs 67 collide with the introduced air to hinder the flow of air. Therefore, the collision rib 67 generates turbulence to increase the frequency of contact between the heat transfer fins 61 and air.

The air flowing into the first flow passage 53 is cooled by the first heat exchanger 60 to below the dew point. Therefore, the water droplets contained in the air while colliding with the collision ribs 67 are removed from the air. This uses the principle of collision capture.

On the other hand, since the second heat exchanger 70 is the same as the configuration of the first exchanger 60 described above, a detailed description thereof will be omitted. However, the heat exchange pipe 73 of the second heat exchanger 70 is connected to the second branch pipe 85 branched from the first branch pipe 81. The second branch pipe (85) via the heat exchange pipe (73) of the second heat exchanger is connected to the circulation pipe (5) at the front point of the compressor (13). In addition, expansion valves 83 and 87 and intermediate valves 8 and 9 are provided in the first and second branch pipes 81 and 85, respectively.

The intermittent portion for selectively opening any one of the first flow path 53 and the second flow path 55 is a pair of guide rails disposed above and below the first flow path 53 and the second flow path 55, respectively. And the first and second doors 43 and 45 sliding along the guide rails 41. The pair of guide rails 41 provided in each flow path are installed to face each other. In the first flow path 43, one guide rail 41 is installed in the upper part of the housing 50, and the other guide rail 41 is installed in the partition 51. In the second passage 45, one guide rail 41 is installed on the partition wall 51, and the other guide rail 41 is installed on the bottom of the housing 50.

Two inlet holes (not shown) are formed on the side of the housing 50 in the vertical direction, respectively. The first door 43 is inserted into the inlet hole formed in the upper portion, and the second door 45 is inserted in the inlet hole formed in the lower portion. Upper and lower ends of the first and second doors 43 and 45 are respectively supported by the guide rails 41. The first and second doors 43 and 45 serve to open and close the first and second flow passages 53 and 55 while slidingly moving along the guide rail 41. Handles 47 are provided in the first and second doors 43 and 45 to facilitate opening and closing.

The above-described first and second doors 43 and 45 allow the air flowing in the evaporator 10 direction to pass through the first channel 53 or through the second channel 55. That is, the intermittent portion selectively opens the first flow path 53 and the second flow path 55 by the operation of the first and second doors 43 and 45. That is, in the state in which the first passage 53 is opened, the second door 45 closes the second passage 55, and in the state in which the second passage 55 is opened, the first door 43 is opened. One euro 53 is closed. Therefore, after passing air through only one of the flow paths, for example, the first flow path 53 to remove moisture, the air is sent to the evaporator 10 and cooled. When a certain time has elapsed, when water condensed in the first heat exchanger 60 installed in the first flow passage 53 freezes to form frost, the first flow passage 53 is closed and the second flow passage 55 is opened. Therefore, even if the defrosting of the first heat exchanger 60 proceeds, the operation of the evaporator 10 is not stopped. In the defrosting operation of the second heat exchanger 70, the second passage 55 is closed and the first passage 53 is opened to allow air to pass through the first passage 53.

Defrosting unit for removing the frost formed in the first and second heat exchanger (60) (70) is connected to the heat storage tank (31) and the connection line (30) extending into the housing 50, the connection line ( 30 and first and second spray nozzles 91 and 93 connected to the first and second heat exchangers 60 and 70, respectively, and installed in the connection line 30 to provide a cooling tank ( And a pump 95 for transferring hot water discharged from 21 to the first and second spray nozzles 91 and 93. The connecting line is divided into two and connected to the first and second spray nozzles 91 and 93, respectively. And the branched connection line is provided with valves (97) (99) for regulating the flow of hot water, respectively. A plurality of injection holes (not shown) are formed in the first and second spray nozzles 91 and 93 so that hot water may be evenly sprayed on the first and second heat exchangers 60 and 70.

In the defrosting operation of the first heat exchanger 60 or the second heat exchanger 70, the hot water stored in the heat storage tank 31 through the first or second spray nozzles 91 and 93 is removed by the defrosting unit. It is injected from the top of the first heat exchanger 60 or the second heat exchanger 70 to dissolve and remove the frost. And a drain pipe for discharging the water generated during the defrosting operation to the outside of the housing 50 is formed. In the present invention, the first drain pipe 107 for draining water during the defrosting operation of the first heat exchanger 60 and the second drain pipe 109 for draining water during the defrosting operation of the second heat exchanger 70 are provided. . The first and second drain pipes 107 and 109 extend out of the reservoir 1.

On the other hand, as shown in Figure 4 in order to remove the frost formed on the evaporator 10, the injection nozzle 100 may be further installed on the top of the evaporator (10). At this time, the injection nozzle 100 is connected to the connection line (30). In the present invention, since the first and second heat exchangers 60 and 70 remove moisture from the air, frost is not formed in the evaporator 10, but due to abnormalities in the apparatus, the first and second heat exchangers 60 This is because dehumidification may be necessary in the evaporator 10 when the dehumidification is performed smoothly at 70. Reference numeral 103 is a valve for controlling hot water flowing into the injection nozzle, 105 is a drain pipe for draining water during the defrosting operation of the evaporator.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, which is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. .

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1: storage 5: circulation tube
10: Evaporator 13: Compressor
15: expansion valve 20: condensation unit
21: cooling tank 25: heat exchange coil
30: connection line
50: housing 60: first heat exchanger
70: second heat exchanger 91: first spray nozzle
93: second spray nozzle

Claims (2)

A reservoir in which foodstuffs can be stored;
An evaporator installed inside the reservoir and having a heat exchange medium to exchange heat with air to absorb the latent heat of evaporation, and a fan installed at the front of the evaporator and blowing air from the rear side of the evaporator to the front to pass the evaporator A unit, a compressor for compressing the heat exchange medium evaporated in the evaporator, a condenser for condensing the heat exchange medium in the gaseous phase compressed by the compressor, and a condensation unit provided between the condenser and the evaporator. Cooling means including an expansion valve for expanding the heat exchange medium;
And dehumidifying means for removing moisture in the air flowing toward the evaporator.
The condensing unit is a cylindrical cooling tank installed outside the reservoir, a cooling water inlet pipe connecting the cooling water supply line to which the cooling water is supplied and the cooling tank to introduce the cooling water into the cooling tank, and is accommodated in the cooling tank. A cooling coil for exchanging heat with the cooling water while the heat exchange medium of the gaseous phase compressed by the compressor flows, hot water heated by the heat exchange medium in the cooling tank is discharged, and a water temperature sensor for detecting a temperature and a hot water outlet tube installed therein; Energy-saving refrigerated freezers and installed in the pipe having a flow rate control valve for adjusting the amount of cooling water flowing through the cooling water inlet pipe in accordance with the output signal of the water temperature sensor. The method of claim 1, wherein the dehumidifying means is installed on the rear of the evaporator, the housing formed with a passage through which air can pass, and is formed to cross the passage of the housing horizontally to the first passage and A partition wall partitioning into a second channel, first and second heat exchangers respectively installed in the first channel and the second channel to condense air passing through the first channel and the second channel; An intermittent portion for selectively opening one of the first and second flow passages, and a defrost portion for removing frost formed on the first and second heat exchangers,
The defrosting part is connected to the hot water outlet pipe and extends into the housing, and the first and second spray nozzles connected to the connection line and respectively installed on the first and second heat exchangers. And a pump installed in the connection line to transfer hot water discharged from the cooling tank to the first and second spray nozzles.
The intermittent portion may be inserted into a pair of guide rails respectively installed above and below the first flow path and the second flow path, and inserted into an inlet hole formed at a side surface of the housing to support upper and lower ends of the guide rails. An energy-saving refrigerated refrigerator warehouse comprising: first and second doors that slide and move along the first and second flow passages, respectively.

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