KR102188081B1 - Cooling and heating system equipped with frost protection and defrost function - Google Patents

Abstract

The present invention relates to a cooling and heating system having frost preventing and defrosting functions, which can appropriately remove moisture generated during defrosting of an evaporator or collect the same for reuse in a heating operation. To this end, the cooling and heating system of the present invention comprises a compressor, a condenser, a liquid receiver, an expansion valve, an evaporator, a reheating device, a gas-liquid separation line, and a recovery line. A reheating line is installed with a first control valve for opening and closing a flow path to supply a refrigerant compressed by the compressor to the reheating device. The condenser is installed with a defrosting line for selectively supplying the condensed refrigerant to the evaporator. Also, the defrosting line is installed with a second control valve for controlling a flow rate of the refrigerant supplied toward the evaporator or opening and closing the flow path to block the supply of the refrigerant. The gas-liquid separation line is installed with a suction pressure control valve for controlling pressure of the refrigerant recovered to the liquid receiver via the evaporator. In addition, the evaporator is automatically defrosted by controlling an operation of opening and closing the second control valve in accordance with pressure and temperature values sensed by the suction pressure control valve.

Description

Cooling and heating system equipped with frost protection and defrost function}

The present invention relates to a cooling and heating system equipped with a frost prevention and defrosting function, and more particularly, to prevent and reduce the frosting phenomenon occurring during cooling operation, and to automatically defrost the frost layer caused by the frosting phenomenon It relates to a cooling and heating system capable of cooling, heating, dehumidification and humidification with prevention and defrosting functions.

In general, in a cooling/heating system, a porous frost layer is formed as wet air with a low temperature continuously contacts the cooling surface (heat exchanger, etc.). This phenomenon in which a porous frost layer is formed is called a frosting phenomenon.

Due to this phenomenon, the heat resistance of the heat exchanger increases, and the flow rate of air decreases due to the closure of the flow path.

Accordingly, various methods have been developed to reduce the phenomenon of frost layer formation in heat exchangers and the like in a cooling and heating system and effectively remove the already generated frost layer.

As a prior art for the above purpose, a cooler using the hot gas injection effect of Korean Patent Publication No. 2049426 and an anti-floating and defrosting system using the cooler (hereinafter referred to as'patent document') are disclosed.

The anti-frosting and defrosting system disclosed in the patent document includes: a compressor for discharging high temperature and high pressure refrigerant gas by compressing refrigerant gas; A condenser connected to the compressor through a refrigerant flow path to perform heat exchange between the refrigerant discharged from the compressor and outside air; A receiver for temporarily storing the liquid refrigerant introduced from the condenser and performing non-mixed heat exchange between the liquid refrigerant and the refrigerant introduced from the evaporator; An expansion valve for adiabatic expansion of the supercooled liquid refrigerant discharged from the receiver; And an evaporator for performing heat exchange between the compressed vapor refrigerant discharged from the expansion valve and indoor air. And the refrigerant discharged from the evaporator is non-mixed heat exchanged with the liquid refrigerant temporarily stored inside the receiver, thereby increasing superheat, and then installing only the gaseous refrigerant to the compressor to be recovered, A refrigeration system including a superheat control heat exchanger connected to an inlet side of the compressor through a refrigerant flow path, comprising: a main defrost flow path branched from a refrigerant flow path connecting the compressor and the condenser; A defrost expansion valve installed in the main defrost passage to adiabatic and expand the refrigerant; A first defrost flow path in which a portion of the refrigerant discharged from the defrost expansion valve is branched and joined to a flow path connecting the expansion valve and the inlet of the evaporator; A second defrost passage configured to diverge the rest of the refrigerant discharged from the defrost expansion valve to join between the inlet and the outlet of the refrigerant coil provided in the evaporator; It comprises a two-way valve installed on the main defrost flow path to proportionally control the amount of refrigerant flow from the compressor to the defrost expansion valve.

However, in the anti-defrost and defrost system disclosed in the above patent document, moisture generated during the defrosting process is included in the air passing through the evaporator through a fan and is directly introduced to the user, through which low temperature and high humidity air is continuously supplied to the user. There is a problem.

In addition, for heating, a separate heating device must be used, and therefore, there is an inconvenience of having to provide a cooling device and a heating device respectively.

Therefore, there is a need to develop a cooling/heating system with an improved structure so that moisture generated during defrosting of the evaporator can be appropriately removed or collected and reused during humidification or heating operation.

KR 10-2049426 B1 (November 21, 2019) KR 10-0550218 B1 (2006.02.01.) KR 10-0357465 B1 (2002. 10. 07.) KR 10-2001-0047650 A (2001. 06. 15.) KR 10-2001-0011493 A (2001. 02. 15.)

The present invention was conceived to solve the problems of the conventional cooling and heating system equipped with anti-frosting and defrosting functions as described above, and the problem to be solved by the present invention is to appropriately remove moisture generated during defrost of the evaporator or It is to provide a cooling and heating system equipped with anti-frosting and defrosting functions that can be reused during heating operation (or maintaining refrigeration and high humidity) by collecting moisture.

In accordance with the present invention for solving the above problems, there is provided a cooling/heating system equipped with anti-frosting and defrosting functions, comprising: a compressor for compressing a refrigerant; A condenser for cooling and condensing the refrigerant while selectively supplying the refrigerant compressed through the compressor through a compressed refrigerant supply line; A receiver configured to separate the gaseous and liquid refrigerant from each other by supplying the refrigerant cooled and condensed through the condenser through a condensed refrigerant supply line; An expansion valve for expanding the supplied liquid refrigerant into a low-temperature, low-pressure gas refrigerant while the liquid refrigerant separated from the receiver is supplied through a liquid refrigerant supply line; An evaporator for cooling outside air to a predetermined temperature through heat exchange by supplying a low-temperature and low-pressure gas refrigerant supplied through the expansion valve through an expansion refrigerant supply line; A reheating device for selectively supplying the refrigerant compressed by the compressor through a reheating line to generate warm air of a predetermined temperature through heat exchange with outside air; A gas-liquid separation line for recovering the refrigerant heat-exchanged with outside air through the evaporator to the receiver; And a recovery line for resupplying the refrigerant recovered by the receiver to the compressor, wherein the reheating line is provided with a first control valve for opening and closing a flow path so that the refrigerant compressed through the compressor is supplied to the reheating device. , In the condenser, a defrost line for selectively supplying the condensed refrigerant to the evaporator is installed, and on the defrost line, a agent for controlling the flow rate of the refrigerant supplied to the evaporator or opening and closing a flow path to block the supply of refrigerant 2 A control valve is installed, and in the gas-liquid separation line, a suction pressure control valve is installed to adjust the pressure of the refrigerant recovered to the receiver through the evaporator, and the pressure and temperature values sensed through the suction pressure control valve are Accordingly, it is characterized in that it is configured to automatically defrost the evaporator by controlling the opening and closing operation of the second control valve.

In addition, the present invention is a water tray having a predetermined size in which water is stored therein while the upper surface of the reheating device is opened; A blowing guide installed along a length on one side of the upper portion of the drip tray to guide outside air to be supplied to the drip tray; A discharge guide installed along the length of the other upper side of the drip tray to guide the discharge of outside air supplied to the drip tray; A pair of side guides connecting side surfaces of the blowing guide and the discharge guide; A reheating coil installed between the blowing guide of the drip tray and the discharge guide and installed so that the refrigerant supplied through the reheating line flows in a meandering direction; And a third blowing fan installed on the blowing guide and selectively supplying air toward the drip tray.

In another aspect, the present invention is further characterized in that a plurality of distribution plates are installed to uniformly distribute air supplied to the drip tray through the third blowing fan by dividing the space vertically at a predetermined interval along the length of the blowing guide. To do.

In addition, the present invention provides a third control for opening and closing a flow path such that one end of a drain line is installed at the bottom of the drip tray, a bypass line is connected to one side, and the drain line is stored or discharged from the drip tray. Another feature is that a valve is installed so that the flow path is closed so that water is stored in the drip tray during humidification control during a heating operation, and the flow path is opened to discharge water stored in the drip tray during dehumidification control during a cooling operation.

In addition, the present invention comprises: a first fluid tank in which the receiver is connected to one end of the gas-liquid separation line and the recovery line; And a second infusion tank installed inside the first infusion tank and connected to the condensed refrigerant supply line, the liquid refrigerant supply line, and the reheat recovery line.

According to the present invention, the pressure and temperature of the refrigerant recovered to the receiver through the evaporator through the suction pressure control valve are sensed during cooling operation, and through this, a frost layer is formed on the surface of the evaporator, reducing the efficiency of heat exchange with outside air. If it is determined that the second control valve is controlled so that a predetermined amount of refrigerant supplied to the condenser is supplied to the evaporator, the flow path of the evaporator is heated using a high-temperature refrigerant. As a result, the frost layer formed on the surface of the flow path of the evaporator is As it is removed, heat exchange efficiency can be maintained.

In addition, as the refrigerant is supplied to the reheating device, the cooled air is reheated and dehumidified or heated, and when heating is activated, the outside air is selectively humidified and supplied using water contained in the drip tray. As a result, one cooling and heating system There is an advantage that cooling, heating, dehumidification and humidification operation and defrost operation are possible by using.

1 is a block diagram showing an example of a cooling and heating system equipped with a frost prevention and defrost function according to the present invention.
Figure 2 is a perspective view showing an example of a reheating device according to the present invention.
3 is a cross-sectional view showing an example of an exhaust unit according to the present invention.
Figure 4 is a view showing an example in which the cooling operation of the cooling and heating system equipped with a frost prevention and defrost function according to the present invention.
5 is a view showing an example in which a cooling and heating system equipped with a frost prevention and defrost function according to the present invention is re-operated.
6 is a view showing an example in which a heating and cooling system equipped with a frost prevention and defrost function according to the present invention is a heating operation.
7 is a view showing an example of a humidification operation of the cooling and heating system equipped with a frost prevention and defrost function according to the present invention.
8 is a view showing an example of a reheating dehumidification operation of the cooling and heating system equipped with a frost prevention and defrosting function according to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail according to the accompanying drawings.

The present invention is to provide a cooling and heating system equipped with a frost prevention and defrost function that can be reused during heating operation (or maintaining refrigeration and high humidity) by appropriately removing moisture generated during defrosting of an evaporator or collecting moisture, The present invention includes a compressor 10, a condenser 20, a receiver 30, an expansion valve 40, an evaporator 50, and a heat removal device 60, as shown in FIG. 1.

The compressor 10 compresses the low-temperature gas refrigerant that has passed through the evaporator 50 and the receiver 30 to be described later to form a high-temperature, high-pressure gas refrigerant, and a condenser 20 that will be described later through a compressed refrigerant supply line L1. It is a configuration that supplies to the side.

At this time, the compressed refrigerant supply line (L1) is connected to one end of the reheating line (L7) for supplying the compressed high-temperature, high-pressure gas refrigerant toward the reheating device (60) to be described later, and the first control valve V1) is installed to open and close the flow path of the reheating line L7.

The condenser 20 is configured to liquefy a refrigerant compressed with a high-temperature, high-pressure gas refrigerant in the compressor 10, and a meandering flow path is formed in the condenser 20, and then a compressed refrigerant supply line L1 at one end of the flow path. One end of the flow path is connected, and one end of the condensed refrigerant supply line L2 connected to the receiver 30 to be described later is connected to the other end of the flow path.

And at 1/5 to 2/5 points of the meandering flow path, one end of the defrost line L9 that directly supplies the high-temperature and high pressure gas refrigerant to the evaporator 50 to be described later is connected. By connecting one end of the defrost line (L9) at the 2/5 point, a refrigerant of about 60 to 70°C is supplied to the evaporator 50, through which the frost layer formed on the surface of the flow path in the meandering direction of the evaporator 50 is defrosted. It will be.

At this time, if the defrost line (L9) is connected to the inlet side of the flow path in the meandering phase of the evaporator 50, the high-temperature gas refrigerant is supplied to the evaporator 50, which may cause damage due to the temperature difference. If it is connected close to the outlet side of the flow path, the temperature of the gas refrigerant is low, which is not preferable because it takes a relatively long time to melt and remove the frost layer formed on the flow path surface of the evaporator 50.

In addition, a second control valve (V2) is installed in the defrost line (L9), and this second control valve (V2) is automatically opened and closed according to a pressure value sensed through a suction pressure control valve (SPR) to be described later. Is composed.

In the receiver 30, the refrigerant cooled and condensed through the condenser 20 is supplied through the condensed refrigerant supply line L2 to separate the gaseous refrigerant and the liquid refrigerant from each other, and are recovered to the compressor 10 through the evaporator 50 It is a configuration to separate the liquid refrigerant contained in the gas refrigerant.

The receiver 30 includes a first fluid tank 31 to which one end of a gas-liquid separation line L5, a recovery line L6, and an oil return line L6' to be described later is connected as shown in FIG. 1, It includes a second infusion tank 32 installed inside the first infusion tank 31 and to which a condensed refrigerant supply line L2, a liquid refrigerant supply line L3, and a reheat recovery line L8 are connected.

Here, the liquid refrigerant supply line (L3) is a flow path connected to the expansion valve (40) to supply the liquid refrigerant to the expansion valve (40), and the recovery line (L6) is recovered to the receiver (30) through the evaporator (50). The oil return line (L6') is a flow path for supplying the refrigerant to the compressor 10, and the oil return line (L6') is a flow path through which oil contained in the refrigerant is collected in the receiver 30 and then resupplied to the compressor 10, and reheat recovery The line L8 is a flow path connected to the reheating coil RC of the reheating device 60 to be described later to supply the refrigerant heat-exchanged through the reheating coil RC to the inside of the second fluid tank 32.

The expansion valve 40 is configured to expand the high-temperature, high-pressure liquid refrigerant supplied through the receiver 30 to form a low-temperature, low-pressure liquid refrigerant, and the expansion valve 40 includes a liquid refrigerant supply line L3 and an expansion refrigerant. It is installed between the supply lines (L4).

The evaporator 50 is configured to cool the outside air by heat exchange between the low temperature and low pressure liquid refrigerant supplied through the expansion refrigerant supply line L4 and outside air.

In the evaporator 50, a meandering flow path for heat exchange with outside air is formed, the inlet side of the flow path is connected to the expanded refrigerant supply line L4, and the outlet side of the flow path is connected to one end of the gas-liquid separation line L5. .

In addition, a first blowing fan (F1) is installed on one side of the evaporator 50, and through the first blowing fan (F1), outside air passes through the meandering flow paths of the evaporator 50 for heat exchange, and then the user side (indoor). Will be supplied.

In addition, a suction pressure control valve (SPR) for adjusting the pressure of the refrigerant recovered to the receiver 30 through the evaporator 50 is installed on the gas-liquid separation line L5, and the suction pressure control valve SPR is The opening and closing operation of the second control valve V2 is controlled according to the pressure value sensed through.

At this time, if the pressure and temperature sensed by the suction pressure control valve (SPR) are lower than the set reference pressure and temperature, a frost layer is formed on the surface of the flow path of the evaporator 50, and it can be seen that the heat exchange efficiency with air is degraded. In this case, the defrost line L9 is opened through the second control valve V2 to supply a high-temperature refrigerant to the evaporator 50, and through this, the flow path of the evaporator 50 is heated to remove the frost layer formed thereon. .

Here, a temperature sensor (not shown) for sensing the temperature of the recovered refrigerant is installed on the gas-liquid separation line L5.

In the reheating device 60, the refrigerant compressed by the compressor 10 is selectively supplied through the reheating line L7 to heat exchange with outside air, through which hot air supplied to the user during heating operation or cold air during cooling operation is reheated to dehumidify. It is a configuration that generates warm air for the purpose of doing so.

As shown in FIG. 2, the reheating device 60 includes a drip tray 61 of a predetermined size in which water is stored while the top surface is opened, and external air is installed along a length on one side of the top of the drip tray 61. A ventilation guide 62 that guides the supply to the drip tray 61, and a discharge guide 63 that is installed along a length on the other side of the top of the drip tray 61 to guide the discharge of the outside air supplied to the drip tray 61, While being installed between a pair of side guides (64, 65) connecting the side surfaces of the blowing guide 62 and the discharge guide 63, and between the blowing guide 62 and the discharge guide 63 of the drip tray 61, A reheating coil (RC) installed so that the refrigerant supplied through the reheating line (L7) flows in a meandering direction, and a third blowing fan (F3) installed in the blowing guide 62 to selectively supply outside air to the drip tray 61 ).

At this time, the reheating device 60 is installed below the evaporator 50 to be described later, through which moisture generated by defrosting the evaporator 50 is collected in the drip tray 61 of the reheating device 60.

In addition, a second blowing fan F2 is installed at one side of the reheating coil RC to allow external air to pass through the reheating coil RC for heat exchange.

In addition, the blowing guide 62 has an outlet side of the air inclined downward at a predetermined angle so that the air supplied to the drip tray 61 through the third blowing fan F3 is discharged toward the bottom of the drip tray 61, and the discharge guide (63) means that the air inside the drip tray (61) is discharged through the discharge guide (63) so that it can be easily mixed with the air passing through the reheating coil (RC), so that the air outlet side faces the outlet side of the reheating coil (RC). It is formed to be inclined upward at a predetermined angle.

In addition, the blowing guide 62 is provided with a plurality of distribution plates 62A that vertically divide the space at predetermined intervals along the length, and the air discharged toward the drip tray 61 through these distribution plates 62A is uniform. Is distributed in a more uniform manner with the water collected in the drip tray 61.

In addition, one end of the drain line OL is installed on the bottom of the drip tray 61, and one end of the bypass line BL is installed on the side of the drip tray 61 at a predetermined height.

And a third control valve (V3) is installed in the drain line (OL) to open and close the flow path so that water is stored or discharged in the drip tray (61), and the other end of the bypass line (BL) is installed in the drain line (OL). Connected.

Through the configuration of the reheating device 60 as described above, the third blowing fan (F3) is operated while the water is collected in the drip tray 61 during humidification control during the heating operation, so that the humidified air passes through the reheating coil (RC). It is mixed with the heated air, and the heated air passes through the reheating coil (RC) through the second blowing fan (F2) during dehumidification control during cooling operation, and is mixed with the air discharged through the first blowing fan (F1). It will be.

Meanwhile, an air supply unit 70 connecting pipes or ducts may be installed so that air supplied to the user side (indoor) through the first and second blowing fans F1 and F2 may be mixed with each other as necessary.

As shown in FIG. 3, the air supply unit 70 includes a supply body 71 having a space of a predetermined size formed therein, and first and second blowing fans spaced apart from each other at a predetermined distance on one side of the supply body 71. The first and second inlets 72 and 73 for supplying the air discharged through (F1, F2) to the inside of the feed base 71, and the feed base 71 are installed in the middle of the other side of the feed base 71 71) It includes an outlet 74 of a predetermined size through which the air inside is discharged to the outside.

In addition, a guide plate 75 for mixing the air introduced from the first and second inlets 72 and 73 is installed inside the feed base 71, and at the inner outlet 74 side of the feed base 71 A storage plate 76 is installed to change the direction of the flow path so that the air introduced through the first and second inlets 72 and 73 is not immediately discharged toward the outlet 74.

At this time, the guide plate 75 is made of a plate having a "V" cross-sectional shape having a predetermined length, and both ends of the guide plate 75 are installed to face the outlet 74 of the feed base body 71, through which The inner space of the main body 71 is partitioned toward the first and second inlets 72 and 73 and toward the outlet 74.

In addition, a plurality of cutouts 75A are formed at both ends of the guide plate 75 at predetermined intervals, and air flowing into the first and second inlets 72 and 73 through these cutouts 75A is guide plate It is discharged toward the discharge port 74 through (75).

The air that has passed through the guide plate 75 in this way flows toward the discharge port 74 and is stored for a predetermined time in the supply body 71 through the reservoir plate 76, and is naturally mixed with each other through this and discharged toward the discharge port 74. It will be.

Hereinafter, it will be described in detail according to an example in which a cooling and heating system equipped with a frost prevention and defrosting function is operated for cooling and heating.

(1) In cooling operation

During the cooling operation, the refrigerant compressed by the compressor 10 is supplied to the condenser 20 through the compressed refrigerant supply line L1, and the refrigerant condensed by the condenser 20 is supplied to the receiver 30 as shown in FIG. ) Is supplied to the expansion valve 40, and the low-temperature, low-pressure gas refrigerant expanded by the expansion valve 40 is heat-exchanged with outside air in the evaporator 50, and the refrigerant that has passed through the evaporator 50 is returned to the receiver ( After being recovered to the compressor 10 through 30), it is operated in a general refrigeration cycle repeating the above process.

(2) During defrost operation

During defrost operation, when the pressure and temperature sensed through the suction pressure control valve (SPR) during cooling operation are lower than the preset reference pressure and temperature, it is operated to remove the frost layer deposited on the evaporator 50. In this case, 5, the second control valve (V2) is opened during the cooling operation, and through this, a predetermined amount of high-temperature refrigerant supplied to the condenser (20) is directly directed toward the evaporator (50) along the defrost line (L9). By being supplied, the frost layer formed on the evaporator 50 is removed.

At this time, the evaporator 50 is heated and the moisture of the melting frost layer is stored in the drip tray 61 of the reheating device 60 located below the evaporator 50.

In addition, during the defrost operation, the first blowing fan F1 of the evaporator 50 is stopped so that air is not supplied to the user (indoor).

(3) During cooling reheating (dehumidification) operation

In the cooling reheating (dehumidification) operation, the refrigeration cycle is operated as in the cooling operation, but the first control valve V1 is opened as shown in FIG. It is further supplied, the second blowing fan (F2) is operated, and the hot air heated through the reheating coil (RC) is mixed with the air cooled through the evaporator 50 and is controlled to be supplied to the user side (indoor). As a result, the cooled air is reheated and dehumidified by the warm air.

(4) During heating operation

In the heating operation, the operation is the same as in the cooling and reheating operation, but as shown in FIG. 7, the cooled air discharged through the first blower fan (F1) is supplied to the outside (or refrigeration facility), and the reheating coil (RC The heated air discharged through) is controlled to be supplied to the room.

(5) Heating humidification operation

During the heating and humidification operation, the operation is the same as the heating operation, but as shown in FIG. 8, the third blowing fan (F3) is operated while the water is stored in the drip tray (61) and heat-exchanged through the reheating coil (RC). When air is supplied to the room through the second blowing fan F2, it is controlled so that the humidified air is mixed and supplied through the third blowing fan F3.

On the other hand, in the above, only shown and described that the refrigerant is simultaneously supplied to the condenser 20 and the reheating device 60 during heating operation, but unlike this, a separate flow path is blocked so that the refrigerant is not supplied to the condenser 20 during heating operation. A control valve (not shown) of is further installed, and through this, the refrigerant may be changed to be supplied only to the reheating device 60 instead of the condenser 20 during heating operation.

According to the present invention, the pressure and temperature of the refrigerant recovered to the receiver through the evaporator through the suction pressure control valve are sensed during cooling operation, and through this, a frost layer is formed on the surface of the evaporator, thereby reducing the efficiency of heat exchange with outside air. If it is determined that the second control valve is controlled so that a predetermined amount of refrigerant supplied to the condenser is supplied to the evaporator, the flow path of the evaporator is heated using a high-temperature refrigerant. As a result, the frost layer formed on the surface of the flow path of the evaporator is As it is removed, heat exchange efficiency is maintained.

In addition, as the refrigerant is supplied to the reheating device, the cooled air is reheated and dehumidified or heated, and when the heating is operated, the outside air can be selectively humidified and supplied using water contained in the drip tray. As a result, one cooling and heating system Cooling, heating, dehumidification and humidification operation and defrost operation are possible by using.

In the above, for the convenience of explanation, the drawings showing the preferred embodiments and the configurations shown in the drawings have been described with reference numerals and names, but this is an embodiment according to the present invention and is It is limited and the scope of the rights should not be interpreted, and the simple substitution with a configuration that has the same effect as a change to a variety of predictable shapes from the description of the invention is within the range that can be changed for easy implementation by a skilled person. You will see it extremely self-evident.

10: compressor 20: condenser
30: receiver 31: first fluid tank
32: second fluid tank 40: expansion valve
50: evaporator 60: reheating device
61: drip tray 62: ventilation guide
62A: distribution plate 63: discharge guide
64, 65: side guide 70: exhaust unit
71: main body 72: first inlet
73: second inlet 74: outlet
75: guide plate 75A: cutout
76: reservoir plate BL: bypass line
F1: 1st blowing fan F2: 2nd blowing fan
F3: 3rd blowing fan L1: compressed refrigerant supply line
L2: condensed refrigerant supply line L3: liquid refrigerant supply line
L4: expanded refrigerant supply line L5: gas-liquid separation line
L6: Recovery line L6': Oil return line
L7: reheating line L8: reheating recovery line
L9: defrost line OL: drain line
RC: Reheating coil SPR: Suction pressure control valve
V1: first control valve V2: second control valve
V3: 3rd control valve

Claims (5)

A compressor 10 for compressing a refrigerant;
A condenser 20 for cooling and condensing the refrigerant while selectively supplying the refrigerant compressed through the compressor 10 through a compressed refrigerant supply line L1;
A receiver 30 for separating the gaseous refrigerant and the liquid refrigerant from each other by supplying the refrigerant cooled and condensed through the condenser 20 through the condensed refrigerant supply line L2;
An expansion valve 40 for expanding the supplied liquid refrigerant into a low-temperature, low-pressure gas refrigerant while the liquid refrigerant separated from the receiver 30 is supplied through the liquid refrigerant supply line L3;
An evaporator 50 for cooling outside air to a predetermined temperature through heat exchange by supplying the low-temperature and low-pressure gas refrigerant supplied through the expansion valve 40 through the expansion refrigerant supply line L4;
A reheating device 60 for selectively supplying the refrigerant compressed by the compressor 10 through a reheating line L7 to generate warm air of a predetermined temperature through heat exchange with outside air;
A gas-liquid separation line (L5) for recovering the refrigerant heat-exchanged with outside air through the evaporator (50) to the receiver (30); And
A recovery line (L6) for resupplying the refrigerant recovered by the receiver (30) to the compressor (10);
Including,
In the reheating line L7,
A first control valve V1 for opening and closing a flow path so that the refrigerant compressed through the compressor 10 is supplied to the reheating device 60 is installed,
In the condenser 20,
A defrost line (L9) for selectively supplying the condensed refrigerant to the evaporator 50 is installed,
On the defrost line L9,
A second control valve (V2) for controlling the flow rate of the refrigerant supplied to the evaporator 50 or opening and closing a flow path to block the supply of refrigerant is installed,
In the gas-liquid separation line (L5),
A suction pressure control valve (SPR) for adjusting the pressure of the refrigerant recovered to the receiver 30 through the evaporator 50 is installed,
It is configured to automatically defrost the evaporator 50 by controlling the opening and closing operation of the second control valve V2 according to the pressure and temperature values sensed through the suction pressure control valve SPR,
The reheating device 60,
A drip tray 61 having a predetermined size in which water is stored therein while the upper surface is opened;
A blowing guide 62 installed along the length of the upper one side of the drip tray 61 to guide external air to be supplied to the drip tray 61;
A discharge guide 63 installed along the length of the upper other side of the drip tray 61 to guide the discharge of the outside air supplied to the drip tray 61;
A pair of side guides 64 and 65 connecting the side surfaces of the air blow guide 62 and the discharge guide 63;
A reheating coil (RC) installed between the blowing guide 62 and the discharge guide 63 of the drip tray 61 so that the refrigerant supplied through the reheating line L7 flows in a meandering direction; And
A third blowing fan (F3) installed on the blowing guide (62) and selectively supplying air toward the drip tray (61);
Cooling and heating system provided with a frost prevention and defrost function, characterized in that it comprises a.
delete The method according to claim 1,
In the blowing guide 62,
It is characterized in that a plurality of distribution plates 62A are installed to uniformly distribute air supplied to the drip tray 61 through the third blowing fan F3 by vertically partitioning the space at a predetermined interval along the length. A cooling and heating system equipped with anti-floating and defrosting functions.
The method according to claim 1,
In the drip tray 61,
One end of the drainage line OL is installed on the floor, and the bypass line BL is connected to one side,
In the drain line OL,
A third control valve (V3) for opening and closing the flow path so that water is stored or discharged in the drip tray 61 is installed, the flow path is closed so that water is stored in the drip tray 61 during humidification control during heating operation, and cooling operation During dehumidification control, a flow path is opened so that the water stored in the drip tray 61 is discharged.
The method according to claim 1,
The receiver 30,
A first fluid tank 31 to which one end of the gas-liquid separation line L5 and the recovery line L6 is connected; And
A second infusion tank (32) installed inside the first infusion tank (31) and connected to the condensed refrigerant supply line (L2), the liquid refrigerant supply line (L3), and a reheat recovery line (L8);
A cooling and heating system provided with a frost prevention and defrost function comprising a.

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