KR100436844B1 - Heating and Cooling System - Google Patents

Abstract

The present invention controls the temperature of the refrigerant flowing into the compressor by mixing the low temperature refrigerant with the high temperature refrigerant heat exchanged in the heat exchanger during heating to prevent the overload of the compressor generated when the high temperature refrigerant is introduced to maintain a smooth operation It relates to a cooling and heating system. The main configuration of the present invention comprises a compressor for extruding a refrigerant at high temperature and high pressure; An indoor unit that heats the refrigerant with indoor air to cool the indoor air, and heats the refrigerant to indoor air when heated to heat the indoor air; An outdoor unit heat-exchanging the coolant with outside air to cool the air and cooling the heat-exchanging air with the outside air to heat the coolant; A first expansion part for expanding the refrigerant discharged from the indoor unit during heating and a second expansion part for cooling the refrigerant discharged from the outdoor unit during cooling; And a heat exchanger configured to mutually heat-exchange the refrigerant discharged from the indoor unit and the refrigerant discharged from the outdoor unit during heating, wherein the first temperature sensor checks the temperature of the refrigerant discharged from the compressor to determine whether the temperature is out of the preset temperature range. A first refrigerant supply line for introducing the refrigerant discharged from the outdoor unit into the compressor; And a first refrigerant control valve controlling the refrigerant discharged from the outdoor unit to be supplied to the refrigerant supply line according to a signal of the temperature sensor.

Description

Cooling and Heating System {Heating and Cooling System}

The present invention relates to a cooling / heating system that prevents overheating of a compressor by introducing a high temperature refrigerant during heating. More specifically, the present invention relates to a multi-level heat exchange between a high temperature refrigerant released from an indoor unit and a low temperature refrigerant released from an outdoor unit during heating. High temperature refrigerant is condensed, low temperature refrigerant evaporates the heat generated by evaporation, and by mixing the low temperature refrigerant with the high temperature refrigerant exchanged in the heat exchanger, the temperature of the refrigerant flowing into the compressor is controlled. The present invention relates to a cooling and heating system that prevents overload of a compressor occurring when it is introduced to maintain smooth operation.

In today's homes, offices, and factories, it is cooled in summer to create a pleasant indoor environment by lowering the indoor temperature.In winter, it is equipped with air-conditioning and heating devices to secure a pleasant indoor environment by increasing the indoor temperature. Cooling and heating devices are used.

Such a cooling and heating device uses a method of heating by burning light oil or gas in a conventional cooling device and an electric coil method using an electric heater.

However, in the former case, there is a problem of oxygen deficiency in the manner of burning dissolved oxygen in the room, and in the latter case, there is a problem of causing excessive electricity consumption because electricity is used.

In order to overcome this problem, as shown in FIG. 1, a cooling and heating system using a refrigerant has been disclosed. Such a cooling and heating system includes an indoor unit 203 installed indoors, an outdoor unit 209 installed outdoors, a compressor 201 that compresses and delivers refrigerant, and an indoor unit 203 or outdoor unit 209. Expansion sections 205 and 207 for changing the refrigerant to low temperature before being supplied, and a plurality of valves 211 and 213 for controlling the flow of the refrigerant.

The indoor unit 203 of such a cooling / heating system cools indoor air through heat exchange with a refrigerant introduced during cooling, and heats indoor air through heat exchange with a refrigerant introduced during heating. The outdoor unit 209 cools the refrigerant introduced through heat exchange with the outdoor air during cooling, condenses the refrigerant introduced through heat exchange with the outdoor air during heating, and heats the indoor air. The expansion units 205 and 207 expand the refrigerant introduced into the outdoor unit 209 when heating to cool them at a lower temperature than the outdoor air, and expand the refrigerant introduced into the indoor unit 203 when cooling and cool them to a lower temperature than the indoor air.

However, in such a cooling and heating system, since a low-temperature refrigerant discharged from an outdoor unit is directly introduced into a compressor, a large amount of heat is required to compress the high-temperature and high-pressure refrigerant from the compressor, as well as mechanical durability.

In order to solve this problem, the inventors of the present invention in the Republic of Korea Patent Application No. 2000-0056282, 2001-0058850, etc., the high-temperature refrigerant discharged from the indoor unit to the outdoor unit and the low-temperature refrigerant discharged from the outdoor unit toward the compressor when the heat exchanger In the present invention, the present invention has been proposed to improve the efficiency of a compressor by heating a low temperature refrigerant to a high temperature using the waste heat contained in the refrigerant discharged from the indoor unit by mutual heat exchange.

However, when the refrigerant flowing into the compressor has a predetermined high temperature or more, the refrigerant compressed in the compressor is compressed at a very high temperature and a high pressure, thereby causing a problem in that the compressor is stopped due to overheating.

An object of the present invention for solving the above problems is to generate heat by condensing the high temperature refrigerant by evaporating the low temperature refrigerant by evaporating the high temperature refrigerant released from the indoor unit and the low temperature refrigerant released from the outdoor unit in multiple stages during heating. It is to provide a cooling and heating system that can prevent the overheating of the compressor by recycling the amount of heat.

Another object of the present invention is to provide a cooling / heating system for smoothly maintaining the operation of a compressor by mixing a low-temperature refrigerant before heat exchange with a high-temperature refrigerant heat exchanged in a heat exchanger during heating.

Still another object of the present invention is to provide a cooling / heating system that can directly remove high temperature refrigerant emitted from an indoor unit during heating to an outdoor unit to remove or prevent frost from the outdoor unit.

1 is a block diagram of a general cooling and heating system.

2 is a block diagram of a cooling and heating system according to an embodiment of the present invention.

3 is a block diagram of the heating operation in the cooling and heating system of FIG.

4 is a block diagram of a cooling operation in the cooling and heating system of FIG.

Figure 5 is a block diagram attached to the anti-frosting facility in the cooling and heating system of FIG.

6 is a block diagram of the heating operation in the cooling and heating system according to another embodiment of the present invention.

7 is a configuration of the cooling operation in the cooling and heating system according to FIG.

Figure 8 is a block diagram attached to the anti-frosting facility in the cooling and heating system of FIG.

<Description of the code | symbol about the principal part of drawing>

10 compressor 12 four-way valve

20: indoor unit 30: outdoor unit

40: first expansion portion 50: second expansion portion

60: heat exchanger 62: first heat exchanger

64 second heat exchanger 70 first temperature sensor

82,84: Check valve 86,88: Refrigerant control valve

103,104: Refrigerant control line

The cooling and heating system of the present invention for achieving the above object is a compressor for extruding a refrigerant at high temperature and high pressure; An indoor unit which is installed indoors and cools the indoor air by heat-exchanging the introduced low-temperature expanded refrigerant with indoor air, and heats the indoor air by heat-exchanging the high-temperature and high-pressure refrigerant introduced with the indoor air during heating; An outdoor unit installed outdoors and heat-exchanging the high-temperature and high-pressure refrigerant introduced therein with the outside air to release heat into the atmosphere, and during heating, an outdoor unit for heating the refrigerant by exchanging the expanded refrigerant introduced therein with the outside air; A first expansion part that expands the high temperature refrigerant discharged from the indoor unit in the heating state to a wet steam state of low temperature and low pressure, and a second expansion part which cools the refrigerant discharged from the outdoor unit in the cooling state; And a heat exchanger for mutual heat exchange between the high temperature refrigerant discharged from the indoor unit and the low temperature refrigerant discharged from the outdoor unit during heating, wherein the low temperature refrigerant exchanged in the heat exchanger is compressed by a compressor.

A first temperature sensor which checks the temperature of the refrigerant flowing into the compressor or the temperature of the refrigerant discharged from the compressor, and compares whether the checked temperature is out of a preset temperature range; And a first refrigerant control valve for controlling a low temperature refrigerant to be supplied to the compressor through a first refrigerant supply line in response to a signal of a temperature sensor when the temperature is out of the temperature range. The heat exchanger may include a first heat exchanger and a second heat exchanger. The high temperature refrigerant discharged from the indoor unit during heating is sequentially introduced into the outdoor unit through the first heat exchanger, the second heat exchanger, and the expansion unit, and the low temperature refrigerant discharged from the outdoor unit is the second heat exchanger or first expansion. The first and second heat exchangers are sequentially introduced to the high temperature refrigerant and the low temperature refrigerant.

Preferably, a second temperature sensor installed at one side of the outdoor unit to measure the outside air temperature during heating and checking whether the measured temperature is lower than a preset temperature, and a second refrigerant supply for directly supplying the refrigerant discharged from the indoor unit to the outdoor unit. And a second refrigerant control valve for controlling the refrigerant discharged from the indoor unit to be supplied to the refrigerant control line when the line and the checked temperature are lower than the set temperature range.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 2, the cooling and heating system is a compressor 10 for extruding a refrigerant at a high temperature and high pressure, and installed in the room, and during the cooling, the indoor air is cooled by heat-exchanging the low-temperature expanded refrigerant and the indoor air that flows in. In addition, when heating, the high-temperature high-pressure refrigerant and the indoor air heat exchanges the indoor air to heat the indoor air, and is installed outdoors. In the heating, the outdoor unit 30 heats the refrigerant by heat-exchanging the introduced refrigerant with the outside air, and the first expansion unit expands the high-temperature refrigerant introduced into the outdoor unit 30 in the low-temperature low-pressure wet steam state during heating. 40, between the second expansion unit 50 for expanding the refrigerant flowing into the indoor unit 20 at a low temperature during cooling, and between the first expansion unit 40 and the second expansion unit 50, Flows into the outdoor unit (30) during heating Checks the temperature of the heat exchanger 60 for exchanging heat between the high temperature refrigerant and the low temperature refrigerant introduced into the compressor 10 and the temperature of the refrigerant flowing into the compressor 10, and checks whether the checked temperature is outside the preset temperature range. And a first refrigerant control valve 86 for controlling the refrigerant discharged from the outdoor unit to be supplied to the refrigerant control line 103 according to the signal of the temperature sensor 70. do.

In addition, as shown in FIG. 6, the heat exchanger includes a first heat exchanger 62 and a second heat exchanger 64, and the high temperature refrigerant discharged from the indoor unit 20 during heating is transferred to the first heat exchanger 62. ), The second heat exchanger 64, and the first heat exchanger 64 and the first expansion part 40 are sequentially introduced into the outdoor unit 30, and the low-temperature refrigerant discharged from the outdoor unit 30 is transferred to the second heat exchanger 64 and the first. The expansion part 40 and the first heat exchanger 62 are sequentially introduced and installed to exchange heat with each other. In this case, the first heat exchanger 62 and the second heat exchanger 64 may be a cylindrical-coil type, a plate type, a spiral type, or the like, and at least one flow part of which is formed in a semicircular shape so that the low-temperature refrigerant is evenly exchanged. It is preferable that the prevention jaw 66 (turbulence generating panel) is formed.

Hereinafter, a cooling and heating process using a cooling and heating system according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, when the user selects for heating, the high temperature and high pressure refrigerant having a temperature of t ₁ compressed by the compressor 10 flows into the indoor unit 20 through the four-way valve 12 and the indoor unit. At 20, the temperature of the indoor air is heated by heat exchange with the indoor air, and at the same time, it is first condensed and lowered to a temperature of t ₂ (t ₁ > t ₂ ).

The refrigerant condensed at a temperature of t ₂ is secondly condensed while passing through the heat exchanger 60 through the pipe lines 93 and 94 through the first check valve 82 and lowered to a temperature of t ₃ . Subsequently, the refrigerant having passed through the heat exchanger 60 is condensed and expanded thirdly while passing through the first expansion part 40 through the pipe line 95 to obtain a low temperature wet steam having a temperature of t ₄ lower than that of outdoor air. (t ₃ > t ₄ , outdoor air> t ₄ ; where a refrigerant having a temperature of t ₅ to t ₆ that is heat exchanged in the heat exchanger and the first expansion portion will be described later). At this time, it is preferable that the first expansion part 40 uses any one of an expansion valve using a capillary method or an expansion valve using a throttling method.

Thereafter, the wet steam refrigerant having a temperature of t ₄ passing through the first expansion part 40 is supplied to the outdoor unit 30 through the piping lines 96 and 97, and heat exchanged with the outdoor air in the outdoor unit 30. It absorbs the outside air temperature and evaporates first to a temperature of t ₅ (t ₄ <t ₅ <outdoor temperature).

On the other hand, the first expanded portion (40) is heat exchange between a high temperature flows into the t _3, as described above with the refrigerant while passing through t ₆ the refrigerant is heated to a temperature of t ₅ is through a pipe line 98 in the outdoor unit (30) Secondary evaporation to a temperature of (t ₅ <t ₆ ). That is, the refrigerant directed to the compressor 10 is heated to a temperature of t ₆ , and the refrigerant directed to the outdoor unit 30 is cooled to a temperature of t ₄ .

In addition, the refrigerant having a temperature of t ₆ evaporated in the first expansion part 40 passes through the heat exchanger 60 through a pipe line 99 and a high temperature refrigerant introduced into t ₂ as described above. Heat exchange and evaporate tertiary to a temperature of t ₇ (t ₆ <t ₇ ). That is, the refrigerant directed to the compressor 10 is heated to a temperature of t ₇ , and the refrigerant directed to the outdoor unit 30 is lowered to a temperature of t ₃ .

Finally, the refrigerant heated to the temperature t ₇ in the heat exchanger 60 is supplied to the compressor 10 through the four-way valve 12 through the pipe line 100, and is compressed to high temperature and high pressure again to reduce the temperature of t ₁ . It is switched to the refrigerant having (t ₇ <t ₁ ).

Since a high temperature refrigerant flows into the compressor 10 through the above process, the amount of heat required to compress the introduced refrigerant to high temperature and high pressure can be greatly reduced.

At this time, the refrigerant having a temperature of t ₇ flowing into the compressor 10 is a temperature higher than a certain temperature (wherein 'temperature higher than a certain'), the compressor may be operated normally due to the refrigerant compressed to an abnormally high temperature used in a cooling and heating system. It means a temperature about 5 ° C lower than the limit temperature for stopping, for example, in a cooling and heating system using such a coolant when the limit temperature of the coolant is about 130 ° C, the temperature above a certain temperature is about 125 ° C. In this case, since the compressor 10 is compressed to a high temperature and the operation of the compressor 10 is stopped, the first temperature sensor 70 checks the temperature of the refrigerant compressed and discharged from the compressor 10 and The set temperature range (herein, the 'preset temperature range' means a temperature in which a high temperature and high pressure can be maintained while preventing the compressor from stopping. For example, as When the threshold temperature of the group is 130 ° C, the set temperature is preferably about 125 ° C to 100 ° C.), And when the temperature of the refrigerant is higher than the preset temperature range, the first refrigerant control valve 86 On) is supplied to the compressor 10 by supplying a low-temperature refrigerant having a temperature of t ₅ discharged from the outdoor unit 30 through the first refrigerant control line 103 to the pipe line 101. Lower the temperature of the refrigerant. On the other hand, the first temperature sensor 70 can be adjusted to check the temperature of the refrigerant flowing into the compressor 10 so that the low-temperature refrigerant can be introduced, the low-temperature refrigerant is not only the refrigerant discharged from the outdoor unit, Naturally, the refrigerant between the first expansion part 40 and the heat exchanger 60 can be used.

After that, when the temperature of the refrigerant discharged from the compressor 10 is lower than the preset temperature range, the refrigerant having the temperature of t ₅ discharged from the outdoor unit 30 is turned off by turning off the first refrigerant control valve 86. Is prevented from flowing into the pipe line 101, and a refrigerant having a temperature of t ₇ heat exchanged in the heat exchanger 60 is introduced into the compressor 10.

In addition, as shown in Figure 4, when the user selects for cooling, the high temperature and high pressure refrigerant having a temperature of t ₁₁ compressed by the compressor 10 is passed through the four-way valve 12, heat exchanger 60, 1 is supplied to the outdoor unit 30 through the pipe lines (100, 99, 98) connected to the expansion unit 40, and condenses itself to a temperature of t ₁₂ through heat exchange with the outdoor air in the outdoor unit 30 (t ₁₁ > t ₁₂ ). At this time, since the refrigerant moves along the pipe lines 100 and 99 passing through the heat exchanger 60 and the first expansion part 40, the refrigerant is moved to the outdoor unit 30 without heat exchange.

The refrigerant having a temperature of t ₁₂ exchanged with the outdoor air in the outdoor unit 30 is supplied to the second expansion unit 50 through the pipe lines 102 and 92 through the second check valve 84 and the second expansion unit. is a low-temperature low-pressure wet steam condition having a temperature of ₁₃ t is expanded while passing through the portion _{(50) (t 12> t} 13).

Thereafter, the refrigerant cooled to t ₁₃ flows into the indoor unit 20 to cool the temperature of the indoor air through heat exchange with the indoor air, and at the same time, it evaporates itself to a temperature of t ₁₄ (t ₁₃ <t ₁₄ ). .

In addition, the refrigerant heated to a temperature of t ₁₄ in the indoor unit 20 flows into the compressor 10 through the four-way valve 12 through the pipe line 91 and is compressed into a refrigerant having a high temperature and high pressure.

At this time, since the first refrigerant control valve 86 is in an off state, the refrigerant passing through the first expansion part 40 is controlled by the first refrigerant installed between the first expansion part 40 and the outdoor unit 30. It is not supplied to the line 103 and flows only into the outdoor unit 30.

On the other hand, the refrigerant control line 103 is installed between the first expansion valve 40 and the heat exchanger 60 or installed between the outdoor unit 30 and the first expansion valve 40 to flow into the compressor 10. It can be selectively used depending on the temperature of the refrigerant. That is, when the temperature of the refrigerant flowing into the compressor 10 through the heat exchanger 10 is included in a high temperature range, the refrigerant discharged from the outdoor unit 30 is mixed, and the temperature of the refrigerant flowing into the compressor 10 is increased. When included in the low temperature range it can be used the refrigerant discharged from the first expansion valve (40).

Meanwhile, in the cooling and heating systems of FIGS. 3 and 4, as illustrated in FIG. 5, the outdoor unit 30 is implanted due to outdoor climatic conditions (eg, sleet, heavy snow) during heating, as shown in FIG. 5. The sol valve 88 is turned on so that a high temperature refrigerant having a temperature of t ₂ is supplied to the pipe line 97 flowing directly into the outdoor unit 30 through the second refrigerant control line 104 so as to be supplied to the outdoor unit. Can solve the idea of. At this time, the implantation in the outdoor unit 30 may be detected by detecting the temperature of the refrigerant flowing into the outdoor unit 30 and the temperature of the refrigerant discharged from the outdoor unit 30 by a second temperature sensor (not shown). It is preferable to control the second refrigerant control valve 88 as a central computer by detecting that the temperature difference between the refrigerant and the discharged refrigerant is within a temperature range preset by the second temperature sensor. In addition, when the temperature of the outdoor air is below 5 ° C. or less, the second refrigerant may be periodically and repeatedly introduced into the outdoor unit 30 through the second refrigerant control line 104 to fundamentally solve the idea of the outdoor unit 30. The refrigerant control valve 88 may be controlled.

On the other hand, since the second refrigerant control valve 88 is usually in an on state, the refrigerant directed from the outdoor unit 30 is moved to the heat exchanger 60 through the pipe line 94.

Hereinafter, a process of heating a cooling / heating system according to another embodiment of the present invention shown in FIGS. 6 and 7 will be described. In this case, the heat exchanger includes a first heat exchanger 62 and a second heat exchanger 64.

When the user selects for heating, as shown in FIG. 6, the high temperature refrigerant having a temperature t ₂ discharged from the indoor unit 20 passes through the first heat exchanger 62 via the piping lines 93 and 94. While lowering to a temperature of t ₃ , passing through a second heat exchanger 64 through a pipe line 95, and lowered to a temperature of t ₄ , and passing through a first expansion part 40 through a pipe line 95 ′. After cooling to a low-temperature wet steam having a temperature of t ₅ , it is introduced into the outdoor unit 30 via the pipe lines 96 and 97 (t ₁ > t ₂ > t ₃ > t ₄ > t ₅ ).

In addition, the refrigerant discharged as the temperature of t ₆ from the outdoor unit 30 is heated to a temperature of t ₇ while passing through the second heat exchanger 64 through the piping line 98, and passes through the piping line 99 to the first temperature. While passing through the expansion portion 40 is heated to a temperature of t ₈ , passing through the pipe line 99 ′ and further heated to a temperature of t ₉ through the first heat exchanger 62 is passed through the pipe line 100 through 4. It enters the compressor 10 through the room valve 12 (t ₆ <t ₇ <t ₈ <t ₉ ). Therefore, since the refrigerant of high temperature flows into the compressor 10, the amount of heat required to compress the introduced refrigerant to high temperature and high pressure can be greatly saved.

At this time, when the refrigerant having a temperature of t ₉ flowing into the compressor 10 is a predetermined temperature or more, the overheating of the compressor 10 occurs more than necessary due to overheating of the compressor 10, and thus the operation is stopped. The sensor 70 checks the temperature of the refrigerant compressed and discharged from the compressor 10 and compares it with a preset temperature range. When the temperature of the refrigerant is higher than the temperature range, the sensor 70 turns on the first refrigerant control valve 86. Low temperature refrigerant having a temperature of t ₆ discharged from the outdoor unit 30 through the first refrigerant control line 103 is supplied to the pipe line 101 to lower the temperature of the refrigerant flowing into the compressor 10. .

After that, when the temperature of the refrigerant discharged from the compressor 10 is lower than the preset temperature range, the refrigerant having the temperature of t ₆ discharged from the outdoor unit 30 is turned off by turning off the first refrigerant control valve 86. Is prevented from flowing into the pipe line 101, and a refrigerant having a temperature of t ₇ is introduced into the compressor 10.

On the other hand, the refrigerant control line 103 is installed between the outdoor unit 30 and the first expansion valve 40 or between the first expansion valve 40 and the second heat exchanger 64 or the second heat exchanger. Installed between the gas 64 and the first heat exchanger 62 may be selectively used according to the temperature of the refrigerant flowing into the compressor 10. That is, when the temperature of the refrigerant flowing into the compressor 10 through the heat exchanger 10 is included in a high temperature range, the refrigerant discharged from the outdoor unit 30 is mixed, and the temperature of the refrigerant flowing into the compressor 10 is increased. When included in the intermediate temperature range, the refrigerant discharged from the first expansion valve 40 is mixed, and when the temperature of the refrigerant flowing into the compressor 10 is included in the low temperature range, it is discharged from the second heat exchanger 64. The refrigerant can be mixed and used.

As shown in FIG. 7, when the user selects cooling, the high temperature and high pressure refrigerant compressed by the compressor 10 through the process as shown in FIG. 4 is transferred to the first heat exchanger through the four-way valve 12. (62), the first expansion unit (40) and the second heat exchanger (64) connected to the outdoor unit 30 through the piping lines (100, 99 ', 99, 98), the outdoor air from the outdoor unit 30 And condensation through heat exchange.

The refrigerant heat-exchanged with the outdoor air in the outdoor unit 30 is supplied to the second expansion unit 50 through the pipe line 102 through the second check valve 84 and expands while passing through the second expansion unit 50. The air is introduced into the indoor unit 20 in a state of low temperature and low pressure wet steam, and the indoor air is cooled through heat exchange with the indoor air, and then introduced into the compressor 10 and compressed into a high temperature and high pressure refrigerant.

Meanwhile, in the cooling and heating systems of FIGS. 6 and 7, as shown in FIG. 8, the outdoor unit 30 is implanted by outdoor climatic conditions (eg, sleet, heavy snow) when heating the second refrigerant control valve. The sol valve 88 is turned on so that a high temperature refrigerant having a temperature of t ₂ is supplied to the pipe line 97 flowing directly into the outdoor unit 30 through the second refrigerant control line 104 so as to be supplied to the outdoor unit. Can solve the idea of.

In addition, when the temperature of the outdoor air is below 5 ° C. or less, the second refrigerant may be periodically and repeatedly introduced into the outdoor unit 30 through the second refrigerant control line 104 to fundamentally solve the idea of the outdoor unit 30. The refrigerant control valve 88 may be controlled.

At this time, since the second refrigerant control valve 88 is normally in an on state, the refrigerant directed from the outdoor unit 30 is moved to the heat exchanger 60 through the pipe line 94.

Although the preferred embodiments of the present invention have been described in detail above, various embodiments of the present invention may be made without departing from the spirit of the present invention as defined in the appended claims by those skilled in the art. All changes in design or modification will fall within the scope of the invention.

As described in detail above, the cooling / heating system according to the present invention mixes the refrigerant of low temperature before heat exchange with the refrigerant of high temperature heat exchanged in the heat exchanger during heating to control the temperature of the refrigerant supplied to the compressor, There is an advantage that can prevent the overload of the compressor to occur due to the smooth operation of the compressor.

In addition, there is an advantage in that the high-temperature refrigerant emitted from the indoor unit during heating can be directly supplied to the outdoor unit to remove or prevent the frost in the outdoor unit.

In addition, there is an advantage that can maximize the recovery of the waste heat by heat-exchanging the refrigerant containing the high temperature waste heat emitted from the indoor unit during heating and the low temperature refrigerant released from the outdoor unit.

Claims (8)

A compressor for extruding the refrigerant at high temperature and high pressure; An indoor unit which is installed indoors and cools the indoor air by heat-exchanging the introduced low-temperature expanded refrigerant with indoor air, and heats the indoor air by heat-exchanging the high-temperature and high-pressure refrigerant introduced with the indoor air during heating; An outdoor unit installed outdoors and heat-exchanging the high-temperature and high-pressure refrigerant introduced therein with the outside air to release heat into the atmosphere, and during heating, an outdoor unit for heating the refrigerant by exchanging the expanded refrigerant introduced therein with the outside air; A first expansion part for expanding the high temperature refrigerant discharged from the indoor unit in cooling to a low-temperature low-pressure wet steam state and a second expansion part for cooling the refrigerant discharged from the outdoor unit during heating; And a heat exchanger for mutual heat exchange between the high temperature refrigerant discharged from the indoor unit and the low temperature refrigerant discharged from the outdoor unit during heating, wherein the low temperature refrigerant exchanged in the heat exchanger is compressed by a compressor. A first temperature sensor which checks the temperature of the refrigerant flowing into the compressor or the temperature of the refrigerant discharged from the compressor, and compares whether the checked temperature is out of a preset temperature range; And a first refrigerant control valve controlling the low temperature refrigerant to be supplied to the compressor through a first refrigerant supply line in response to a signal from a temperature sensor when the temperature is out of the temperature range. The heat exchanger includes a first heat exchanger and a second heat exchanger, and the high temperature refrigerant discharged from the indoor unit during heating is sequentially introduced into the outdoor unit via the first heat exchanger, the second heat exchanger, and the expansion unit. A low temperature refrigerant discharged from an outdoor unit is sequentially introduced into the second heat exchanger, the first expansion unit, and the first heat exchanger, and the high temperature refrigerant and the low temperature refrigerant are mutually heat exchanged. The air conditioning system as claimed in claim 1, wherein the first refrigerant supply line is installed at any one of the first expansion unit and the outdoor unit or between the heat exchanger and the first expansion unit. delete delete The cooling and heating system of claim 1, further comprising a coolant flow rate adjusting unit installed at one side of a pipe line through which the coolant is circulated, and controlling a quantity of coolant circulated according to a change in the outside air temperature. The apparatus of claim 1, further comprising: a second temperature sensor installed at one side of the outdoor unit to measure the outside air temperature and to check whether the measured temperature is lower than a preset temperature; A second refrigerant supply line which directly supplies the refrigerant discharged from the indoor unit to the outdoor unit when the checked temperature is lower than a set temperature range; And And a second refrigerant control valve controlling the refrigerant discharged from the indoor unit to be supplied to the refrigerant supply line according to the signal of the temperature sensor. delete delete