KR100987705B1 - Refrigerating cycle applicable hot-gas defrosting system - Google Patents

Abstract

PURPOSE: A refrigerating device employing a hot gas defrosting system is provided to reduce the defrosting time by the excellent heating performance and to prevent the temperature raise in a refrigerating device. CONSTITUTION: A refrigerating device employing a hot gas defrosting system comprises a compressor(10), an indoor heat exchanger(20), a first expansion valve(30), an outdoor heat exchanger(40), a defrosting pipe(70), a defrosting-purpose heat exchanger(50) and a controller(100). The indoor heat exchanger heat-exchanges the steam refrigerant of high temperature and pressure of the compressor with the indoor air and transfers the high temperature of refrigerant to an indoor space. The first expansion valve expands the refrigerant heat-exchanged in the indoor heat exchanger. The outdoor heat exchanger heat-exchanges and evaporates the refrigerant expanded in the first expansion valve with the outdoor air and transfers low temperature and pressure of steam refrigerant which has been evaporated. The defrosting-purpose pipe transfers the high temperature and pressure of steam refrigerant from the compressor to the outdoor heat exchanger immediately if the outdoor heat exchanger has been frosted. The defrosting-purpose heat exchanger operates only when the outdoor heat exchanger performs a defrosting operation. The controller changes the above device to a defrosting mode for a predetermined time if the outdoor heat exchanger has been frosted.

Description

Refrigerating cycle applicable Hot-gas Defrosting System

The present invention relates to a refrigeration cycle apparatus to which a hot gas defrosting system is applied, and more particularly, it is applied to a binary refrigerator and a low temperature warehouse, and does not require a separate defrost heater and does not need to be used in a reverse cycle method. Low burnout and liquid hammer phenomenon, strong heating capacity, short defrost time, suppress the rise of temperature in the freezer, increase energy saving and efficiency, reduce the cost of power saving and use costs The present invention relates to a refrigeration cycle apparatus in which a hot gas defrosting system, which can be defrosted while maintaining a normal theory refrigeration cycle, can be configured with multiple coolers even in a multi-system.

The heat pump type air conditioner is a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing mechanism, an outdoor heat exchanger, and the four-way valve in order to connect the conduit, and the four-way valve and the compressor connected to the suction conduit. A refrigerant circuit, comprising: a second heating circuit provided in a conduit between the compressor and a four-way valve; and an auxiliary heat exchanger connected to the second heating circuit and installed on at least one side of the outdoor heat exchanger. When the temperature falls below the dew point temperature, the heat medium of the second heating circuit is heated by the condensation heat of the refrigerant gas of the high temperature and high pressure compressed by the compressor, and the heat medium is circulated to the auxiliary heat exchanger installed on the side of the outdoor heat exchanger. The outside air to be sucked in, and also heating and convection heating and radiant heating in combination to provide a comfortable heating.

The heat pump system connects a compressor, a four-way valve, an indoor heat exchanger, a cooling expansion valve, a heating expansion valve, an outdoor heat exchanger, and the four-way valve in order with a conduit, and sucks the four-way valve and the compressor. A basic refrigeration circuit connected by conduits; A hot water heating circuit connected between the compressor of the conduit and the four-way valve; It is installed between the cooling expansion valve and the heating expansion valve of the conduit to fill the heat medium, and between the latent heat storage material and the heating heat exchanger connected to the hot water heating circuit, and between the cooling expansion valve and the heating expansion valve of the conduit. A heat storage tank incorporating the installed recondensation heat exchanger; The heat storage tank is connected to a return pipe provided with a supply pipe and a circulation pump, and is configured as a heat exchanger installed on the suction side of the outdoor heat exchanger, and the heat medium charged in the heat storage tank is maintained by the recondensation heat exchanger and the heat exchanger. The heat medium maintaining the set temperature is supplied to a heat exchanger installed on the suction side of the outdoor heat exchanger to preheat the outside air during the heating operation of the dew point below the dew point and to cool the outside air during the cooling operation having a high outside temperature. .

Patents 367176 and 486095 disclose a heat pump type cooling and heating device and a heat pump system for responding to the request.

However, the heat pump type air conditioner and the heat pump system arrange an auxiliary heat exchanger or a heat exchanger on the suction side of the outdoor heat exchanger, and heat the outdoor air preheated or cooled in the auxiliary heat exchanger or the heat exchanger by the suction fan. Inhalation to the air side will not only defrost the frost generated between the fins of the outdoor heat exchanger, but also take longer defrost time, and will also reheat when the cooled air passes through the fins. It is not good.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

It is applied to two-way refrigerator and low temperature warehouse, and does not need separate defrost heater, and it does not need to be used in reverse cycle method, so there is little burnout and liquid hammer phenomenon of heat pump device, and defrost time is required by strong heating ability. The present invention aims to provide a refrigeration cycle apparatus in which a hot gas defrosting system is applied, which is short and suppresses a rise in temperature in the freezer, thereby increasing energy saving and efficiency, and reducing costs according to power saving and use costs.

Another object of the present invention is to provide a refrigeration cycle apparatus to which a hot gas defrosting system, which can be defrosted while maintaining a normal theoretical refrigeration cycle, can be configured with a plurality of coolers in a multi-system.

In order to achieve the above object, the present invention is a compressor for compressing a vapor refrigerant at high temperature and high pressure;

An indoor heat exchanger connected to a pipe in which the compressor and the first solenoid valve are installed to exchange high temperature and high pressure steam refrigerant of the compressor with indoor air to transfer high temperature of the refrigerant to the room;

A first expansion valve connected to the indoor heat exchanger and a pipe to expand the refrigerant exchanged in the indoor heat exchanger;

The refrigerant expanded by the first expansion valve connected to the pipe with the first expansion valve is evaporated by heat exchange with the outdoor air, and the vaporized low temperature and low pressure vapor refrigerant is connected with the pipe where the compressor and the second solenoid valve are installed. An outdoor heat exchanger for transmitting;

When frost occurs in the outdoor heat exchanger, the high temperature and high pressure steam refrigerant of the compressor is immediately transferred to the outdoor heat exchanger and branched from the discharge side pipe of the compressor so that the outdoor heat exchanger is defrosted by the high temperature and high pressure steam refrigerant. Defrost tubing connected to the pipe;

A compressor connected to an outdoor heat exchanger and a third solenoid valve is installed to operate only when the outdoor heat exchanger is defrosted, and the refrigerant condensed into the defrost in the outdoor heat exchanger is transferred to evaporate after heat exchange, and the vaporized vapor refrigerant is connected to a pipe by a compressor. Defrost heat exchanger to transfer to;

When the frost occurs in the outdoor heat exchanger by controlling the compressor, the indoor heat exchanger, the first expansion valve, the outdoor heat exchanger, the defrosting pipe, the defrost heat exchanger, and the first, second and third solenoid valves, A control unit for switching to the defrost mode;

It relates to a refrigeration cycle apparatus is applied to the hot gas defrosting system, characterized in that comprising a.

In addition, the present invention provides a compressor for compressing a vapor refrigerant at high temperature and high pressure;

An indoor heat exchanger connected to the compressor by a pipe to transfer the high temperature and high pressure steam refrigerant of the compressor with indoor air to transfer the high temperature of the refrigerant to the room;

A first expansion valve connected to the indoor heat exchanger and a pipe to expand the refrigerant exchanged in the indoor heat exchanger;

The refrigerant expanded by the first expansion valve connected to the pipe with the first expansion valve is evaporated by heat exchange with the outdoor air, and the vaporized low temperature and low pressure vapor refrigerant is connected with the pipe where the compressor and the second solenoid valve are installed. An outdoor heat exchanger for transmitting;

When frost occurs in the outdoor heat exchanger, the high temperature and high pressure steam refrigerant of the compressor is transferred to the outdoor heat exchanger and connected to the discharge side pipe and the suction side pipe of the first expansion valve so that the outdoor heat exchanger is defrosted by the high temperature and high pressure steam refrigerant. A defrost bypass tube;

A compressor connected to an outdoor heat exchanger and a third solenoid valve is installed to operate only when the outdoor heat exchanger is defrosted, and the refrigerant condensed into the defrost in the outdoor heat exchanger is transferred to evaporate after heat exchange, and the vaporized vapor refrigerant is connected to a pipe by a compressor. Defrost heat exchanger to transfer to;

When the frost occurs in the outdoor heat exchanger by controlling the compressor, the indoor heat exchanger, the first expansion valve, the outdoor heat exchanger, the defrost bypass pipe, the defrost heat exchanger, and the second and third solenoid valves, A control unit for switching to the defrost mode;

It relates to a refrigeration cycle apparatus is applied to the hot gas defrosting system, characterized in that comprising a.

As described above, the refrigeration cycle apparatus to which the hot gas defrosting system of the present invention is applied is applied to a binary refrigerator and a low temperature warehouse, and does not need a separate defrost heater and does not need to be used in a reverse cycle method, so that the heat pump apparatus is burned out. (燒損) and less liquid hammer phenomenon, strong heating capacity, short defrost time, restrain the rise of temperature in the freezer, thereby increasing energy saving and efficiency, and reducing the cost of power saving and use costs There is.

In addition, it is possible to defrost while maintaining a normal theoretical refrigeration cycle, there is an effect that can be configured of a plurality of coolers in a multi-system.

1 and 2 is a schematic view showing a refrigeration cycle apparatus to which a hot gas defrosting system according to a first embodiment of the present invention is applied,
3 and 4 are schematic views showing a refrigeration cycle apparatus to which a hot gas defrosting system according to a second embodiment of the present invention is applied.

The present invention has the following features to achieve the above object.

The present invention provides a compressor for compressing a vapor refrigerant at high temperature and high pressure;

An indoor heat exchanger connected to a pipe in which the compressor and the first solenoid valve are installed to exchange high temperature and high pressure steam refrigerant of the compressor with indoor air to transfer high temperature of the refrigerant to the room;

A first expansion valve connected to the indoor heat exchanger and a pipe to expand the refrigerant exchanged in the indoor heat exchanger;

The refrigerant expanded by the first expansion valve connected to the pipe with the first expansion valve is evaporated by heat exchange with the outdoor air, and the vaporized low temperature and low pressure vapor refrigerant is connected with the pipe where the compressor and the second solenoid valve are installed. An outdoor heat exchanger for transmitting;

When frost occurs in the outdoor heat exchanger, the high temperature and high pressure steam refrigerant of the compressor is immediately transferred to the outdoor heat exchanger and branched from the discharge side pipe of the compressor so that the outdoor heat exchanger is defrosted by the high temperature and high pressure steam refrigerant. Defrost tubing connected to the pipe;

A compressor connected to an outdoor heat exchanger and a third solenoid valve is installed to operate only when the outdoor heat exchanger is defrosted, and the refrigerant condensed into the defrost in the outdoor heat exchanger is transferred to evaporate after heat exchange, and the vaporized vapor refrigerant is connected to a pipe by a compressor. Defrost heat exchanger to transfer to;

When the frost occurs in the outdoor heat exchanger by controlling the compressor, the indoor heat exchanger, the first expansion valve, the outdoor heat exchanger, the defrosting pipe, the defrost heat exchanger, and the first, second and third solenoid valves, And a controller for switching to the defrost mode.

In addition, the present invention provides a compressor for compressing a vapor refrigerant at high temperature and high pressure;

An indoor heat exchanger connected to the compressor by a pipe to transfer the high temperature and high pressure steam refrigerant of the compressor with indoor air to transfer the high temperature of the refrigerant to the room;

A first expansion valve connected to the indoor heat exchanger and a pipe to expand the refrigerant exchanged in the indoor heat exchanger;

The refrigerant expanded by the first expansion valve connected to the pipe with the first expansion valve is evaporated by heat exchange with the outdoor air, and the vaporized low temperature and low pressure vapor refrigerant is connected with the pipe where the compressor and the second solenoid valve are installed. An outdoor heat exchanger for transmitting;

When frost occurs in the outdoor heat exchanger, the high temperature and high pressure steam refrigerant of the compressor is transferred to the outdoor heat exchanger and connected to the discharge side pipe and the suction side pipe of the first expansion valve so that the outdoor heat exchanger is defrosted by the high temperature and high pressure steam refrigerant. A defrost bypass tube;

A compressor connected to an outdoor heat exchanger and a third solenoid valve is installed to operate only when the outdoor heat exchanger is defrosted, and the refrigerant condensed into the defrost in the outdoor heat exchanger is transferred to evaporate after heat exchange, and the vaporized vapor refrigerant is connected to a pipe by a compressor. Defrost heat exchanger to transfer to;

When the frost occurs in the outdoor heat exchanger by controlling the compressor, the indoor heat exchanger, the first expansion valve, the outdoor heat exchanger, the defrost bypass pipe, the defrost heat exchanger, and the second and third solenoid valves, And a controller for switching to the defrost mode.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

Before describing the various embodiments of the present invention in detail with reference to the accompanying drawings, it can be seen that the application is not limited to the details of the configuration and arrangement of the components described in the following detailed description or shown in the drawings. will be. The present invention can be implemented and practiced in the second embodiments and can be carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral, " and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 and 2 are schematic views showing a refrigeration cycle apparatus to which a hot gas defrosting system according to a first embodiment of the present invention is applied.

As shown in FIG. 1 and FIG. 2, the refrigeration cycle apparatus to which the hot gas defrosting system of the present invention is applied does not install a separate defrosting device in a heat pump system used for a binary refrigerator and / or a low temperature warehouse. In the invention for defrosting using a pump system, the heat pump system having the defrost includes a compressor (10), an indoor heat exchanger (20), a first expansion valve (30), an outdoor heat exchanger (40), And a defrosting pipe 70, a defrost heat exchanger 50, and a control unit 100.

The compressor 10 is a device that compresses the refrigerant vapor in a low pressure state to high pressure, converts it into high temperature and high pressure, and then discharges the refrigerant.

As shown in FIG. 1, the indoor heat exchanger 20 is connected to the compressor 10 by a pipe, and the high temperature and high pressure steam refrigerant of the compressor 10 is sucked into the inside, and the high temperature and high pressure steam refrigerant is A device that transfers high-temperature of the refrigerant to the room by heat-exchanging the air in the room. When heating, it acts as a condenser that condenses high-temperature, high-pressure refrigerant vapor into a liquid state by heat dissipation through heat exchange in the room. Serves as an evaporator to evaporate the refrigerant. As described above, depending on the cooling or heating cases, the circulation direction of the refrigerant is reversed.

Here, a first solenoid valve (1) is installed in the pipe connecting the indoor heat exchanger (20) and the compressor (10) to open and close a high-temperature, high-pressure steam refrigerant to transfer therein, and the first solenoid valve (1) is controlled by the signal of the controller 100.

In addition, the indoor heat exchanger 20 is a method of sucking the air in the interior to discharge to one side, at this time, the high-temperature, high-pressure steam refrigerant transferred from the compressor 10 to the interior of the indoor heat exchanger 20 As it penetrates, it exchanges heat with indoor air, thereby supplying heat required for heating in the room.

As shown in FIG. 1, the first expansion valve 30 is connected to the indoor heat exchanger 20 in a pipe and expands the refrigerant condensed by heat exchange in the indoor heat exchanger 20. Since it is an expansion valve, it does not describe a separate configuration and function.

Here, the check valve 90 is installed on the discharge side of the first expansion valve 30 so that the refrigerant conveyed to the outdoor heat exchanger 40 flows backward and is not sucked back into the first expansion valve 30.

As illustrated in FIG. 1, the outdoor heat exchanger 40 is connected to the indoor heat exchanger 20 by a pipe, and a first connection is provided between the outdoor heat exchanger 40 and the indoor heat exchanger 20. An expansion valve 30 is installed, and the refrigerant expanded through the first expansion valve 30 is sucked into the outdoor heat exchanger 40 and discharged. At this time, the outdoor heat exchanger 40 is evaporated by heat exchange with the refrigerant expanded in the first expansion valve 30 while the outdoor air passes through the inside.

Here, the outdoor heat exchanger 40 has a suction side connected to the first expansion valve 30 by a pipe, and the discharge side is connected to the compressor 10 by a pipe and evaporated by heat exchange with outdoor air to vaporize low temperature and low pressure. The refrigerant is delivered to the compressor 10.

In addition, a second solenoid valve 2 is installed in a pipe connected between the outdoor heat exchanger 40 and the compressor 10 to open and close a low-temperature, low-pressure steam refrigerant to transfer therein, and the second solenoid valve (2) is controlled by the signal of the control part 100.

Hereinafter, a defrosting system for removing frost generated when the outdoor heat exchanger 40 exchanges heat with outdoor air will be described.

As shown in FIG. 1, the defrosting pipe 70 is branched from the discharge side pipe of the compressor 10 and connected to the suction side pipe of the outdoor heat exchanger 40, and the frost of the outdoor heat exchanger 40 is increased. When generated, the high temperature and high pressure steam refrigerant of the compressor 10 is transferred directly to the outdoor heat exchanger 40 along the defrosting pipe 70, and the outdoor heat exchanger 40 is defrosted by the high temperature and high pressure steam refrigerant.

Here, the defrost pipe 70 is further provided with a fourth solenoid valve 4 to open and close the interior under the control of the control unit 100 in the defrost mode, and the fourth solenoid valve 4 is normally locked. The high temperature and high pressure steam refrigerant of the compressor 10 is transferred to the indoor heat exchanger 20. In the defrost mode, the first solenoid valve 1 is closed and the fourth solenoid valve 4 is opened to open the high temperature of the compressor 10. The high pressure steam refrigerant is transferred into the outdoor heat exchanger 40 through the defrosting pipe 70.

As shown in FIG. 1, the defrost heat exchanger 50 is a heat exchanger 50 used for defrosting by operating only during the defrost of the outdoor heat exchanger 40, and the outdoor heat exchanger 40 and the compressor. The pipe branched at one end of the pipe connecting the 10 is connected to the defrost heat exchanger 50 so that the refrigerant condensed to the defrost in the outdoor heat exchanger 40 is transferred therein. In this case, a third solenoid valve 3 is installed in the pipe connected between the outdoor heat exchanger 40 and the defrost heat exchanger 50 to open and close the refrigerant transporting the inside.

Here, the defrost heat exchanger (50) is a general plate heat exchanger, and is composed of two suction parts (51, 53), two discharge parts (52, 54), the first suction part (51) Is connected to the tube connected to the outdoor heat exchanger 40, the refrigerant condensed in the defrost in the outdoor heat exchanger 40 is sucked into the interior through the first suction unit 51, the interior of the defrost heat exchanger 50 After being transported along, it is discharged through the first discharge unit 52, and as shown in FIG. 1, the refrigerant discharged from the first discharge unit 52 again returns to the second suction unit on the opposite side. The first discharge part 52 and the second suction part 53 are connected to the connection pipe 55 so as to be sucked into the 53.

In addition, the connection pipe 55 is provided with a second expansion valve 60 to expand the refrigerant condensed in the defrost in the outdoor heat exchanger 40, the refrigerant expanded through the second expansion valve 60 is After suctioning through the second suction part 53, it is transported along the inside of the defrost heat exchanger 50 and then transferred to the second discharge part 54, wherein the second suction part 53 2 is transferred to the discharge unit 54, the heat exchanger with the refrigerant condensed to the defrost in the outdoor heat exchanger 40 for transporting the first suction unit 51 and the first discharge unit 52 is transferred to the compressor 10. Refrigerant in a condition that can be made. In this case, the above-described method is a reverse cycle heat exchange method, in which a refrigerant suctioned / discharged inside the heat exchanger is exchanged with each other without using an external heat source through one heat exchanger.

In addition, the second discharge part 54 of the defrost heat exchanger 50 has a pipe connected between the compressor 10 and the second discharge part 54 so that the refrigerant discharged is transferred to the compressor 10.

As described above, the heat pump system and the defrosting system described above are used by connecting a plurality of heat pump systems and the defrosting system to the main pipe as shown in FIG. 2.

3 and 4 are schematic views showing a refrigeration cycle apparatus to which a hot gas defrosting system according to a second embodiment of the present invention is applied. 3 and 4, the refrigeration cycle apparatus to which the hot gas defrosting system of the present invention is applied has the same configuration and function as the refrigeration cycle apparatus to which the hot gas defrosting system of the first embodiment described above is applied.

However, in the refrigeration cycle apparatus to which the hot gas defrosting system of the second embodiment is applied, the defrosting bypass pipe 80 is installed instead of the defrosting pipe 70 of the first embodiment, and the defrosting bypass pipe 80 is When frost occurs in the outdoor heat exchanger (40), it is used only in the defrost mode, and is connected to the discharge side pipe and the suction side pipe of the first expansion valve (30) so that the high temperature and high pressure steam refrigerant of the compressor (10) is the first expansion valve. It is delivered to the outdoor heat exchanger 40 without passing through the defrost 30.

Here, when the high-temperature, high-pressure steam refrigerant of the compressor 10 is transferred to the defrost bypass pipe 80, referring to Figure 3, passes through the indoor heat exchanger 20, in this case, the control unit 100 is indoors By deactivating the heat exchanger 20, the high-temperature, high-pressure steam refrigerant of the compressor 10 is transferred to the outdoor heat exchanger 40 through the defrost bypass pipe 80.

In addition, the defrost bypass pipe 80 is further provided with a fifth solenoid valve 5 to open and close the high-temperature, high-pressure steam refrigerant to transfer the inside of the defrost mode, the fifth solenoid valve 5 Is controlled by a signal from the controller 100.

Thus, the heat pump system and the defrosting system described in the first and second embodiments are controlled by a controller 100 installed outside, and the controller 100 is a compressor 10, an indoor heat exchanger. 20, the first expansion valve 30, the outdoor heat exchanger 40, the defrost heat exchanger 50, the second expansion valve 60, the first, second, third, fourth, fifth solenoid valve (1, 2, 3, 4, 5 are controlled by electric signals.

In addition, the control unit 100 operates the heat pump system for a set time (3 to 4 hours) by a timer device (not shown) installed therein, and automatically or manually removes the heat pump system every 3 to 4 hours. Defrosting is possible by setting various methods such as defrosting the outdoor heat exchanger 40 by operating the commercial system for a set time (5 to 10 minutes).

10 compressor 20 indoor heat exchanger
30: first expansion valve 40: outdoor heat exchanger
50 defrost heat exchanger 60 second expansion valve
70: defrosting pipe 80: defrost bypass pipe
90: check valve 100: control unit

Claims (5)

A compressor (10) for compressing the vapor refrigerant at high temperature and high pressure;
An indoor heat exchanger 20 which is connected to a pipe in which the compressor 10 and the first solenoid valve 1 are installed to exchange high temperature and high pressure steam refrigerant of the compressor 10 with indoor air to transfer high temperature of the refrigerant to the room. )Wow;
A first expansion valve (30) connected to the indoor heat exchanger (20) in a pipe to expand the refrigerant exchanged in the indoor heat exchanger (20);
A pipe connected with the first expansion valve 30 and the refrigerant expanded in the first expansion valve 30 is exchanged with the outdoor air to evaporate, and the compressor 10 and the second solenoid valve 2 are installed. An outdoor heat exchanger 40 connected to the evaporator to transfer the vaporized low-temperature, low-pressure vapor refrigerant;
When frost occurs in the outdoor heat exchanger 40, the high temperature and high pressure steam refrigerant of the compressor 10 is directly transferred to the outdoor heat exchanger 40 so that the outdoor heat exchanger 40 is defrosted by the high temperature and high pressure steam refrigerant. A defrost pipe 70 branched from the discharge side pipe of the compressor 10 to be connected to the suction side pipe of the outdoor heat exchanger 40;
The outdoor heat exchanger 40 and the third solenoid valve 3 are connected to each other in such a manner that the outdoor heat exchanger 40 is operated only at the time of defrosting, and the tube connected to the outdoor heat exchanger 40 is connected to the first suction unit 51. And a refrigerant condensed in a defrost in the outdoor heat exchanger 40 are sucked into the inside through the first suction part 51 and then discharged through the first discharge part 52, and the first discharge part is discharged. The first discharge part 52 and the second suction part 53 are connected to the connection pipe 55 such that the refrigerant discharged from the 52 is sucked back to the second suction part 53 on the opposite side, and the connection pipe ( 55, a second expansion valve 60 is installed to expand the refrigerant condensed to the defrost in the outdoor heat exchanger 40, and the refrigerant expanded through the second expansion valve 60 is second intake unit 53. After suctioning through) and transferring to the second discharge part 54, the defrosting is performed in the outdoor heat exchanger 40 transferred from the first suction part 51 to the first discharge part 52. A defrost heat exchanger (50) which is exchanged with the condensed refrigerant and then transferred to the compressor (10) through the second discharge portion (54);
The compressor 10, the indoor heat exchanger 20, the first expansion valve 30, the outdoor heat exchanger 40, the defrost pipe 70, the defrost heat exchanger 50, and the first, second and third solenoids A controller 100 for controlling the valves 1, 2, 3 to switch to the defrost mode for a set time T when frost occurs in the outdoor heat exchanger 40;
Refrigeration cycle apparatus is applied to the hot gas defrosting system, characterized in that comprises a.
A compressor (10) for compressing the vapor refrigerant at high temperature and high pressure;
An indoor heat exchanger (20) connected to the compressor (10) by a pipe to heat the high-temperature, high-pressure steam refrigerant of the compressor (10) with indoor air to transfer the high temperature of the refrigerant to the room;
A first expansion valve (30) connected to the indoor heat exchanger (20) in a pipe to expand the refrigerant exchanged in the indoor heat exchanger (20);
A pipe connected with the first expansion valve 30 and the refrigerant expanded in the first expansion valve 30 is exchanged with the outdoor air to evaporate, and the compressor 10 and the second solenoid valve 2 are installed. An outdoor heat exchanger 40 connected to the evaporator to transfer the vaporized low-temperature, low-pressure vapor refrigerant;
When frost occurs in the outdoor heat exchanger 40, the high temperature and high pressure steam refrigerant of the compressor 10 is transferred to the outdoor heat exchanger 40 so that the outdoor heat exchanger 40 is defrosted by the high temperature and high pressure steam refrigerant. A defrost bypass pipe (80) connected to the discharge pipe and the suction pipe of the first expansion valve (30);
The outdoor heat exchanger 40 and the third solenoid valve 3 are connected to each other in such a manner that the outdoor heat exchanger 40 is operated only at the time of defrosting, and the tube connected to the outdoor heat exchanger 40 is connected to the first suction unit 51. And a refrigerant condensed in a defrost in the outdoor heat exchanger 40 are sucked into the inside through the first suction part 51 and then discharged through the first discharge part 52, and the first discharge part is discharged. The first discharge part 52 and the second suction part 53 are connected to the connection pipe 55 such that the refrigerant discharged from the 52 is sucked back to the second suction part 53 on the opposite side, and the connection pipe ( 55, a second expansion valve 60 is installed to expand the refrigerant condensed to the defrost in the outdoor heat exchanger 40, and the refrigerant expanded through the second expansion valve 60 is second intake unit 53. After suctioning through) and transferring to the second discharge part 54, the defrosting is performed in the outdoor heat exchanger 40 transferred from the first suction part 51 to the first discharge part 52. A defrost heat exchanger (50) which is exchanged with the condensed refrigerant and then transferred to the compressor (10) through the second discharge portion (54);
The compressor 10, the indoor heat exchanger 20, the first expansion valve 30, the outdoor heat exchanger 40, the defrost bypass pipe 80, the defrost heat exchanger 50, and the second and third solenoids A control unit 100 for controlling the valves 2 and 3 to switch to the defrost mode for a set time T when frost occurs in the outdoor heat exchanger;
Refrigeration cycle apparatus is applied to the hot gas defrosting system, characterized in that comprises a.
The method of claim 1,
The defrosting pipe 70 is a refrigeration cycle apparatus is applied to the hot gas defrosting system, characterized in that the fourth solenoid valve (4) is further installed to open and close the interior under the control of the control unit 100 in the defrosting mode.
The method of claim 2,
In the defrost bypass pipe (80), in the defrost mode, a fifth solenoid valve (5) is further installed to open and close the interior by the control of the control unit (100). Device.
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