KR20100027353A - Refrigerating and freezing apparatus - Google Patents

Abstract

PURPOSE: A refrigerating and freezing device is provided to effectively remove condensed load without an air-cooled condenser or a cooling tower. CONSTITUTION: A refrigerating and freezing device(1) comprises a compressor(10), a high-temperature heat exchanger(20), a defrosting tank(30), a low-temperature heat exchanger(40), a first condenser(50), a liquid receiver(60), a condenser expansion valve(70), a second condenser(80), a cooling water circulation tube(90), an evaporator expansion valve(100), an evaporator(110), and a defrosting pipe(120). The high-temperature heat exchanger heat-exchanges hot water with a refrigerant from the compressor, and heats the heat-exchanged refrigerant. The defrosting tank stores hot water for defrosting. The heat-exchanged refrigerant flows into the low-temperature heat exchanger. The first condenser heat-exchanges the refrigerant from the low-temperature heat exchanger with cooling water. The liquid receiver stores the refrigerant liquefied in the first condenser. The cooling water circulation tube has a cooling water circulation pump(91). The evaporator has a heat exchanger to maintain low temperature of a refrigerating compartment and a freezing compartment. The defrosting pipe supplies the hot water through the high-temperature heat exchanger to the heat exchanger of the evaporator.

Description

Refrigeration Freezers {REFRIGERATING AND FREEZING APPARATUS}

The present invention relates to a refrigerating and freezing apparatus that can provide cold air into a refrigerating / freezing chamber.

In general, the refrigeration freezer is applied to a variety of uses, ranging from a freezer for refrigeration or freezing storage to an ice room installed in a jjimjilbang, such a refrigeration freezer can be divided into water-cooled and air-cooled.

In the case of the water-cooled refrigeration apparatus, the high temperature cooling water heated in the condenser is cooled to a low temperature in a cooling tower installed on the building, and then is sent back to the condenser. However, the cooling tower is installed to remove the condensation load is mainly installed on the roof of the building, as well as very difficult to install, including the piping there was a problem that takes a lot of facility costs.

In addition, in the case of the air-cooled refrigeration refrigerator, the air-cooled condenser that provides a high temperature air volume to the outside as it is formed in a structure that cools the condensation load generated from the condenser (outdoor air) to the outside air introduced by the cooling fan ( Due to the outdoor unit), there was a problem causing a lot of inconvenience to the surroundings due to the noise of the cooling fan.

It is an object of the present invention to provide a refrigerating and freezing apparatus that can effectively remove a condensation load without a cooling tower or an air-cooled condenser.

Another object of the present invention is to provide a refrigerating and freezing apparatus that enables the use of a part of the condensation load on the defrost of the evaporator to increase energy savings and to enable defrost even without using an electric heater.

An object of the present invention described above is a compressor for compressing and discharging a refrigerant at high temperature and high pressure, and a high temperature heat exchanger connected to the compressor and heat-exchanging hot water with a refrigerant introduced from the compressor to heat it to a high temperature. The hot water to be stored is stored and one side is provided with a hot water circulation pipe for circulating the hot water through the hot heat exchanger and the defrost tank is installed on the hot water circulation pipe, the hot water circulation pump is installed, connected to the high temperature heat exchanger A low temperature heat exchanger through which a refrigerant heat-exchanged with hot water in a high temperature heat exchanger is introduced, a first condenser connected to the low temperature heat exchanger and heat-exchanging the refrigerant having passed through the low temperature heat exchanger with cooling water, and connected to the first condenser and in the first condenser A receiver for storing a liquefied refrigerant and connected to the receiver and the receiver Expansion valve for condenser to expand the refrigerant of the low temperature and low pressure gas, one side is connected to the expansion valve for the condenser, the other side is connected to the compressor via the low temperature heat exchanger and the refrigerant passing through the expansion valve for the condenser heat exchange with the coolant After supplying to the low-temperature heat exchanger again, the second heat exchanger and the second condenser introduced into the compressor after the heat exchange again with the refrigerant heat-exchanged with hot water in the high temperature heat exchanger, heat exchange by the cooling water in the first condenser and the second condenser The first condenser and the second condenser in order to flow through the cooling water circulation pipe is provided with a cooling water circulation pump for circulating the cooling water, an expansion valve for the evaporator connected to the receiver, and is installed in the refrigerating / freezing chamber and one side thereof It is connected to the expansion valve for the evaporator, the expansion valve for the evaporator therein As the coarse refrigerant flows through and absorbs heat in the refrigerating / freezing chamber and is evaporated, a heat exchanger is provided to keep the temperature of the refrigerating / freezing chamber at a low temperature. The other side is an evaporator connected to the compressor via the low-temperature heat exchanger. Defrosting is connected to the inlet side of the defrost tank of the hot water circulation pipe passage, the other side is connected to the defrost tank through the heat exchanger of the evaporator, and supplying hot water passed through the high temperature heat exchanger to the heat exchanger of the evaporator to enable defrosting. It is achieved by providing a refrigeration freezing device comprising a conduit.

According to a preferred feature of the invention, the receiver is connected to the compressor by a connecting pipe and on the connecting pipe when the discharge pressure of the compressor falls below a set value to open a portion of the refrigerant provided to the second condenser A superheat elimination valve is installed to increase the temperature of the coolant in the coolant circulation pipe through the second condenser while cooling the compressor by transferring to the compressor.

According to a more preferred feature of the invention, the expansion valve for the compressor is provided on the connecting pipe connecting the receiver and the compressor.

According to a more preferable feature of the invention, the defrost control valve for opening the defrost pipe only when defrosting is installed in the connection portion of the hot water circulation pipe and the defrost pipe.

According to the refrigerating refrigeration apparatus according to the present invention, by utilizing a part of the condensation load for the defrost of the evaporator for defrosting has an excellent effect that can effectively remove the condensation load without a cooling tower or air-cooled condenser.

In addition, the use of a part of the condensation load on the defrost of the evaporator not only increases the energy saving effect, but also makes it possible to defrost even without using an electric heater, thereby preventing fire and equipment failure due to overheating of the electric heater. It also works.

In addition, the compressor can be effectively prevented from overheating, and the whole device can be operated stably.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to describe in detail enough to be easily carried out by those skilled in the art to which the present invention pertains. This does not mean that the technical spirit and scope of the present invention is limited.

1 shows a block diagram of a refrigerating and freezing apparatus 1 according to the present invention.

The refrigeration freezer (1) according to the present invention can effectively remove the condensation load without a cooling tower or an air-cooled condenser, and by using a part of the condensation load on the defrost of the evaporator, energy saving effect is not only increased, but also no electric heater is used. Defrost is possible even if not possible, as shown in Figure 1, the compressor 10 to compress and discharge the refrigerant at a high temperature and high pressure, and is connected to the compressor 10, hot water is introduced from the compressor 10 A high temperature heat exchanger 20 for heating to a high temperature by heat exchange with a refrigerant, and hot water used for defrosting is stored therein, and a hot water circulation pipe 31 for circulating the hot water therein through the high temperature heat exchanger. It is provided and connected to the defrost tank (30) and the high temperature heat exchanger (20) on which the hot water circulation pump (33) is installed on the hot water circulation pipe (31). A low temperature heat exchanger 40 into which the refrigerant exchanged with the hot water is introduced, and a first condenser 50 connected to the low temperature heat exchanger 40 and heat-exchanging the refrigerant having passed through the low temperature heat exchanger 40 with the cooling water; 1 is connected to the condenser 50, the receiver 60, the refrigerant liquefied in the first condenser 50 is stored, and connected to the receiver 60, and expands the refrigerant of the receiver 60 to low-temperature low pressure gas The condenser expansion valve 70 and one side is connected to the expansion valve 70 for the condenser and the other side is connected to the compressor 10 via the low temperature heat exchanger 40 and the refrigerant passing through the expansion valve 70 for the condenser A second condenser (80) for supplying heat to the low temperature heat exchanger (40) and re-exchanging heat with the refrigerant exchanged with hot water in the high temperature heat exchanger (20), and then introducing the refrigerant into the compressor (10); The first condenser 50 and the second condenser to allow heat exchange by the coolant in the condenser 50 and the second condenser 80 are possible. Cooling water circulation pipe (90) provided with a cooling water circulation pump (91) for circulating the cooling water through the storage unit (80) sequentially, an expansion valve (100) for the evaporator connected to the receiver (60), and a refrigerating / freezing chamber It is installed in (3) and one side thereof is connected to the expansion valve 100 for the evaporator, the refrigerant passing through the expansion valve 100 for the evaporator therein while absorbing the heat in the refrigerating / freezing chamber (3) while flowing through the evaporator A heat exchanger 111 is provided to keep the temperature of the refrigerating / freezing chamber 3 at a low temperature, and the other side thereof is provided with an evaporator 110 connected to the compressor 10 via a low temperature heat exchanger 40, and one side is a hot water circulation pipe. It is connected to the inlet side of the defrost tank 30 of the 31 and the other side is connected to the defrost tank 30 through the heat exchanger 111 of the evaporator 110 and the hot water passed through the high temperature heat exchanger 20 to evaporator Including a defrost pipe line 120 to supply to the heat exchanger 111 of 110 to enable defrosting Is done.

Here, the compressor 10 absorbs heat in the refrigerating / freezing chamber 3 in the heat exchanger 111 of the evaporator 110 and compresses the evaporated refrigerant to high temperature and high pressure so as to easily condensate the high temperature heat exchanger 20. It serves to circulate the refrigerant by discharging it, and any compressor having a known configuration such as a reciprocating compressor, a rotary compressor, a scroll compressor, as well as a compressor capable of compressing the refrigerant can be used. Do.

One side of the compressor 10 is connected to the high temperature heat exchanger 20 which will be described later, and the other side of the compressor 10 passes through the low temperature heat exchanger 40 to heat exchanger 111 of the second condenser 80 and the evaporator 110. Respectively).

The above-mentioned compressor 10 is connected to a high temperature heat exchanger 20, which receives the hot water from the compressor 10 in the defrost tank 30 circulated through the hot water circulation pipe 31. By heat-exchanging with the high temperature and high pressure refrigerant to serve to heat the hot water in the defrost tank (30) to the temperature required for the defrost and to lower the temperature of the refrigerant to facilitate the condensation of the refrigerant, multi-tube heat exchange Although a known heat exchanger such as an air conditioner, an air-cooled heat exchanger, a jacketed heat exchanger, a spherical heat exchanger, or the like may be applied, it is preferable that the heat exchanger is formed as a plate heat exchanger that enables effective heat exchange with a small amount of refrigerant.

The above-mentioned high temperature heat exchanger 20 flows through the hot water circulation pipe 31 of the defrost tank 30, and the defrost tank 30 serves to store hot water to be used for defrosting. A hot water circulation pipe 31 for circulating the hot water therein through the high temperature heat exchanger 20 is provided, and a hot water circulation pump 33 for generating a hot water circulation force is provided on the hot water circulation pipe path 31.

As the hot water in the defrost tank 30 is circulated through the hot water circulation pipe 31 and is heated by the high temperature and high pressure refrigerant introduced from the compressor 10 in the high temperature heat exchanger 20 and then introduced into the inside thereof again. Heated to the required temperature on the defrost; The warm water in the defrost tank 30 preferably includes an antifreeze.

Defrost tank 30 is also connected to the air vent 35 for adjusting the internal pressure according to the inflow / outflow of hot water to be used for defrost.

In addition, although not shown, the defrost tank 30 is connected to a pipe for heating or hot water supply, the hot water therein may be used for heating or hot water supply.

The above-mentioned high temperature heat exchanger 20 is connected to a low temperature heat exchanger 40, which is connected to the high temperature heat exchanger 20 and simultaneously with the second condenser 80 which will be described later. As the refrigerant introduced by heat exchange with the hot water in the high temperature heat exchanger 20 and the refrigerant condensed in the second condenser 80 are exchanged with each other, the refrigerant to be introduced into the first condenser 50 is cooled to effectively occur. The refrigerant to be introduced into the compressor 10 serves to increase the thermal efficiency of the refrigerating and freezing apparatus 1 according to the present invention by increasing its temperature to facilitate compression at high temperature and high pressure.

The low temperature heat exchanger 40 heats the refrigerant to be introduced into the compressor 10 via the second condenser 80 to be described later, and heats the refrigerant to be introduced into the compressor 10 via the evaporator 110 to be described later. By acting as a kind of auxiliary evaporator.

Like the high temperature heat exchanger 20 described above, the low temperature heat exchanger 40 may be a known heat exchanger such as a multi-tube heat exchanger, an air-cooled heat exchanger, a jacketed heat exchanger, a spiral heat exchanger, or the like. It is preferable that the heat exchanger is formed of a plate heat exchanger.

A first condenser 50 is connected to the above-described low temperature heat exchanger 40, and the first condenser 50 serves to condense and liquefy the refrigerant having a high temperature and high pressure discharged from the compressor 10. In the discharged from the compressor 10 through the high temperature heat exchanger 20 and the low temperature heat exchanger 40, the sequentially cooled refrigerant is condensed by heat exchange with the cooling water in the cooling water circulation pipe 90 to be described later.

The first condenser 50 is a water-cooled condenser condensed by cooling water, and may be formed in various structures such as a vertical shell tube type, a horizontal shell tube type, and a double tube type.

The first condenser 50 is connected to the receiver 60, which is connected to the first condenser 50 and the expansion valve 70 for the condenser or the expansion valve 100 for the evaporator which will be described later. The refrigeration apparatus according to the present invention by temporarily storing the refrigerant liquefied in the first condenser 50 and the amount of the refrigerant provided to the expansion valve 70 for the condenser or expansion valve 100 for the evaporator 100 by appropriately It is a safety device to make the refrigeration cycle of (1) safe.

The above-mentioned receiver 60 is connected to the expansion valve for condenser 70, the expansion valve 70 for the condenser expands the high-pressure liquid refrigerant flowing from the receiver 60 to expand the low-pressure refrigerant to By lowering the boiling point so that evaporation can easily occur during the flow through the low temperature heat exchanger (40), not only an expansion valve including a capillary tube but also an electronic expansion valve can be used.

One side of the second condenser 80 is connected to the expansion valve 70 for the condenser, and the second condenser 80 is connected to the compressor 10 through the low temperature heat exchanger 40 and the inside thereof. As the furnace cooling water circulation pipe (90) flows through, the refrigerant passing through the expansion valve (70) for the condenser is heat-exchanged with the cooling water of the cooling water circulation pipe (90), which will be described later, and then provided back to the low temperature heat exchanger (40). Heat exchange with the hot water and the refrigerant heat-exchanged at 20 again and then introduced to the compressor 10 serves to increase the thermal efficiency of the refrigerating and freezing apparatus 1 according to the present invention.

The first condenser 50 and the second condenser 80 described above are sequentially flowed by the cooling water circulation conduit 90, and the cooling water circulation conduit 90 is the first condenser 50 and the second condenser 80. The cooling water is provided to serve to circulate the cooling water so that heat exchange by the cooling water is possible, and a cooling water circulation pump 91 for generating a circulation force of the cooling water is provided thereon.

The cooling water in the cooling water circulation pipe (90) is discharged from the compressor (10) while flowing through the first condenser (50), and then cools the refrigerant cooled sequentially through the high temperature heat exchanger (20) and the low temperature heat exchanger (40). Condensation, and then through the second condenser 80, where the original temperature is maintained by heat exchange with the low temperature refrigerant through the expansion valve 70 for the condenser.

Cooling water circulation pipe (90) is preferably formed separately from the hot water circulation pipe (31) in order to exclude the influence of the cooling water by the temperature of the hot water. Cooling water flowing through the coolant circulation pipe passage 90 may be replenished from the outside and connected to the air vent.

The above-mentioned receiver 60 is connected to the expansion valve 100 for evaporator is branched, the expansion valve 100 for the evaporator is expanded to a low-pressure refrigerant by expanding the high-pressure liquid refrigerant flowing from the receiver 60 By lowering the boiling point so that evaporation can easily occur in the evaporator 110 to be described later, an expansion valve including a capillary tube as well as an electronic expansion valve may be used.

An evaporator 110 is connected to the expansion valve 100 for the evaporator, which is installed in a refrigerating / freezing chamber 3 such as, for example, a freezer, and has an expansion valve 100 for the evaporator therein. Heat exchanger 111 is provided to maintain the temperature of the refrigerating / freezing chamber (3) at a low temperature as the refrigerant passing through the through flows through and absorbs heat in the refrigerating / freezing chamber (3).

One side of the heat exchanger 111 is connected to the expansion valve 100 for the evaporator and the other side of the heat exchanger 111 is connected to the compressor 10 via the low temperature heat exchanger (40).

One side of the defrosting pipe line 120 is connected to the inlet side of the defrost tank 30 of the above-described hot water circulation pipe 31, and the defrosting pipe line 120 has the other side of the heat exchanger 111 of the evaporator 110. As it is connected to the defrost tank (30) through a) serves to enable the defrost by supplying relatively high temperature hot water passed through the high temperature heat exchanger (20) to the heat exchanger (111) of the evaporator (110).

The defrost control valve 121 is installed at the inlet side of the defrost tank 30 of the hot water circulation pipe 31 and the defrost pipe 120, that is, the hot water circulation pipe 31. Normally, the defrosting pipe line 120 is closed so that relatively high temperature hot water flowing through the high temperature heat exchanger 20 flows into the defrosting tank 30, but when defrosting is required, the defrosting pipe line 120 is opened. The relatively high temperature hot water flowing through the high temperature heat exchanger 20 is provided around the heat exchanger 111 of the evaporator 110 to remove excessively accumulated ice on the heat exchanger 111 of the evaporator 110.

In addition, the receiver 60 is connected to the compressor 10 by the connecting pipe 131, and the opening of the second condenser 80 when the discharge pressure of the compressor 10 falls below the set value on the connecting pipe 131. The superheat elimination valve 130 is installed to transfer a part of the refrigerant provided to the compressor 10. The superheat elimination valve 130 has a compressor due to an excessively low cooling water temperature or other components constituting a refrigeration cycle. When the compressor 10 is overheated or the discharge pressure drops below a predetermined value as the load is applied to the load 10, a part of the refrigerant provided to the second condenser 80 is transferred to the compressor 10 to thereby provide the compressor 10. It serves to cool. As a result, the amount of the refrigerant flowing into the second condenser 80 is reduced, thereby increasing the temperature of the cooling water in the cooling water circulation pipe 90 flowing through the second condenser 80 and in the cooling water circulation pipe 90. The coolant temperature above the temperature can be maintained.

An expansion valve 140 for a compressor is installed on the connection pipe 131 connecting the receiver 60 and the compressor 10, and the expansion valve 140 for the compressor is a compressor when the superheat elimination valve 130 is opened. A portion of the refrigerant provided to the second condenser 80 to be transferred to 10) is expanded so that compression can be easily performed.

Hereinafter, the overall operation of the refrigerating and freezing device 1 according to the invention as follows:

In the case of the refrigerating and freezing apparatus 1 according to the present invention, a refrigeration cycle of a refrigerator, such as compression-condensation-expansion-evaporation of a refrigerant, is applied. The heat exchanger 20 and the first condenser 50, the expansion valve 70 for the condenser responsible for expanding the refrigerant, the expansion valve 100 for the evaporator 100 and the expansion valve 140 for the compressor, and the low temperature for evaporating the refrigerant A heat exchanger 40 and an evaporator 110 are provided. As the heat released to the outside during the condensation of the refrigerant is transferred from the high temperature heat exchanger 20 to the hot water flowing through the hot water circulation pipe 21, the hot water in the defrost tank 30 is suitable for defrosting (for example, 65 ° C.). To 80 ° C.).

The circulation of the refrigerant is as follows: The refrigerant compressed by the high temperature and high pressure refrigerant in the compressor 10 is primarily cooled by heat exchange with hot water flowing through the hot water circulation pipe 31 in the high temperature heat exchanger 20. It is introduced into the low temperature heat exchanger (40). The refrigerant introduced into the low temperature heat exchanger (40) is expanded to low pressure in the expansion valve (70) for the condenser, and then cooled by the coolant in the second condenser (80) and then the low temperature low pressure refrigerant introduced into the low temperature heat exchanger (40). By being cooled by the secondary to the first condenser 50, the refrigerant condensation in the first condenser 50 can occur very effectively. As the liquid refrigerant condensed in the first condenser 50 passes through the receiver 60 and passes through the expansion valve 70 for the condenser, the pressure drops, and as a result, the boiling point of the refrigerant is lowered. At the time of introduction into the low temperature heat exchanger 40, the refrigerant is evaporated by the refrigerant passing through the high temperature heat exchanger 20 and then introduced again into the compressor 10.

In addition, the liquid refrigerant condensed in the first condenser 50 flows into the expansion valve 100 for the evaporator through the receiver 60 and expands at low pressure, and is refrigerated / freezing chamber in the heat exchanger 111 of the evaporator 110. Heat is absorbed from (3) to maintain the refrigerating / freezing chamber (3) at a set low temperature and at the same time evaporates with gas refrigerant, and then flows into the compressor (10) via a low temperature heat exchanger (40).

Looking at the circulation of the cooling water is as follows: The cooling water circulated along the cooling water circulation pipe (90) is first provided to the first condenser (50) is compressed to high temperature and high pressure from the compressor (10) and then the high temperature heat exchanger (20) and The temperature is increased while condensing the refrigerant through heat exchange with the cooled refrigerant through the low temperature heat exchanger (40). Then, as it is provided to the second condenser 80 is cooled by the low-temperature refrigerant flowing from the expansion valve 70 for the condenser to maintain the original temperature again.

In addition, when the discharge pressure of the compressor 10 drops below the set value due to the load on the compressor 10 due to a too low cooling water temperature or other components constituting the refrigeration cycle during the initial winter operation, overheating is eliminated. As the valve 130 is opened, a portion of the refrigerant provided to the second condenser 80 is transferred to the compressor 10 to cool the compressor 10, and at the same time, the refrigerant flowing into the second condenser 80 may be As the amount decreases, as the heat exchange rate between the refrigerant and the cooling water decreases, the temperature of the cooling water in the cooling water circulation passage 90 flowing through the second condenser 80 is further increased. The problem can be solved at once.

The refrigerating and cooling device 1 according to the present invention is initially operated by opening the expansion valve 70 for the condenser and expansion valve 100 for the compressor and in the defrost tank 30 by heat exchange in the high temperature heat exchanger 20. The hot water temperature is heated to about 60 to 70 degrees, thereby removing the load heat in the refrigerating / freezing chamber 3 and accumulating heat in the defrost tank 30. Since defrosting is essential in the refrigerating / freezing chamber 3, efficiency is not lowered as compared with conventional systems.

Whenever a certain amount of drop is generated in the heat exchanger 111 of the evaporator 110 through the operation of the refrigerating and cooling device 1 according to the present invention, the defrost control valve 121 is opened to open the defrost tank 30. The hot water is introduced into the evaporator 110 to remove the drop, and the cooled hot water is introduced into the defrost tank 30 again.

1 is a block diagram of a refrigeration apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

1: refrigerating and freezing apparatus according to the present invention

3: cold storage / freezer 10: compressor

20: high temperature heat exchanger 30: defrost tank

31: hot water circulation pipe 33: hot water circulation pump

40 low temperature heat exchanger 50 first condenser

60: receiver 70: expansion valve for the condenser

80: second condenser 90: cooling water circulation pipe

91: cooling water return pump 100: expansion valve for the evaporator

110: evaporator 111: heat exchanger

120: defrost pipe 121: defrost control valve

130: overheat elimination valve 131: connecting pipe

140: expansion valve for compressor

Claims (4)

A compressor for compressing and discharging the refrigerant at high temperature and high pressure; A high temperature heat exchanger connected to the compressor to heat the hot water with the refrigerant introduced from the compressor to heat the high temperature; A defrost tank in which hot water is stored for defrosting and a hot water circulation pipe for circulating hot water therein through the high temperature heat exchanger and a hot water circulation pump installed on the hot water circulation pipe; A low temperature heat exchanger connected to the high temperature heat exchanger and into which a refrigerant exchanged with hot water is introduced into the high temperature heat exchanger; A first condenser connected to the low temperature heat exchanger and configured to heat exchange the refrigerant having passed through the low temperature heat exchanger with cooling water; A receiver connected to the first condenser and storing a refrigerant liquefied in the first condenser; An expansion valve connected to the receiver for expanding the refrigerant of the receiver into a gas of low temperature and low pressure; One side is connected to the expansion valve for the condenser, the other side is connected to the compressor via the low temperature heat exchanger, and the refrigerant passing through the expansion valve for the condenser heat exchanged with the cooling water and then provided back to the low temperature heat exchanger and the hot water in the high temperature heat exchanger A second condenser in which heat is exchanged with the heat-exchanged refrigerant and then introduced into the compressor; A cooling water circulation pipe having a cooling water circulation pump configured to sequentially flow through the first condenser and the second condenser and circulate the cooling water so as to allow heat exchange by the cooling water in the first condenser and the second condenser; An expansion valve for the evaporator connected to the receiver; It is installed in the refrigerating / freezing chamber and one side thereof is connected to the expansion valve for the evaporator, and inside the refrigerant, the refrigerant passing through the expansion valve for the evaporator flows by absorbing heat in the refrigerating / freezing chamber and evaporating the temperature of the refrigerating / freezing chamber. An evaporator having a heat exchanger for maintaining the heat exchanger and connected to the compressor via the low temperature heat exchanger; And One side is connected to the inlet side of the defrost tank of the hot water circulation passage, the other side is connected to the defrost tank through the heat exchanger of the evaporator, and the hot water passed through the high temperature heat exchanger is supplied to the heat exchanger of the evaporator to enable defrosting. A defrosting refrigeration apparatus comprising a defrost pipe passage. The method according to claim 1, The receiver is connected to the compressor by a connecting pipe and is opened when the discharge pressure of the compressor drops below a set value on the connecting pipe to transfer a part of the refrigerant provided to the second condenser to the compressor to transfer the compressor. And a superheat removal valve for cooling and increasing a temperature of the cooling water in the cooling water circulation pipe flowing through the second condenser. The method according to claim 2, Refrigerating and refrigerating device, characterized in that the expansion valve for the compressor is installed on the connecting pipe connecting the receiver and the compressor. The method according to any one of claims 1 to 3, And a defrost control valve is installed at the connection portion between the hot water circulation pipe passage and the defrost pipe passage to open the defrost pipe passage only during defrosting.

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