KR100965057B1 - Heat pump - Google Patents

Abstract

PURPOSE: A heat pump is provided to increase condensing performance using the auxiliary coil of an outdoor unit as a condenser in a cooling operation. CONSTITUTION: A heat pump comprises a compressor(500), an outdoor primary coil(520), an outdoor auxiliary coil(530), an outdoor blower(540), an indoor coil(550), an indoor blower(560), a four way valve(510), a refrigerant transfer line, expansion valves(590,600), and an accumulator(630). The outdoor primary coil performs the role of a condenser in a cooling operation and the role of an evaporator in a heating operation. The outdoor auxiliary coil performs the role of the evaporator or the condenser. The outdoor blower supplies outdoor air to the outdoor primary coil and the outdoor auxiliary coil. The indoor coil performs the heat exchange of refrigerant and indoor air. The indoor blower supplies the indoor air to the indoor coil. The four way valve switches the refrigerant transfer line to a heating circuit or a cooling circuit. According to the operation mode, the expansion valve decreases the temperature and the pressure of refrigerant. The accumulator separates liquid refrigerant incoming into the compressor.

Description

Heat pump {Heat pump}

The present invention can improve the performance of the heat pump by using the outdoor unit auxiliary coil as an evaporator or a condenser according to the outdoor conditions and load fluctuations, and more particularly relates to a heat pump that fundamentally cuts the ground that can cause frost in the outdoor unit coils in winter. .

1 is a schematic diagram of a typical heat pump according to the prior art. The general heat pump is configured to include an indoor unit coil 110, an expansion device 120, an outdoor unit coil 130, a compressor 140, and a four-way valve 150.

As shown in FIG. 1, when the heat pump operates as a winter heating circuit, when the humidity of the air flowing into the outdoor unit coil 130 is high and the temperature is in the range of -2 to 2 ° C., an implantation occurs in the outdoor unit coil 130. The outdoor unit coil 130 loses the function of the heat exchanger. Therefore, in this case, defrosting is required, and the heat pump is operated as a cooling circuit to operate the outdoor unit coil 130 as a condenser and the indoor unit coil 110 as an evaporator so that high-temperature and high-pressure liquid refrigerant flows into the outdoor unit coil 130. The defrosting method of removing the frost attached to the outdoor unit coil 130 is used. However, in this case, since the indoor unit coil 110 operates as an evaporator, further indoor heating becomes impossible.

2 and 3 are schematic views of a heat pump heating operation method and a heating and defrosting operation method according to the prior art, respectively, which have been filed and registered by the present applicant (10-0712196, "Heat pump system and outdoor unit defrosting method").

As shown in FIG. 2, when the heat pump operates as a heating circuit, the high temperature and high pressure refrigerant exiting the compressor 200 operates as a condenser through the four-way valve 210 and the control valve 250. It is introduced into the room is heated by the operation of the indoor unit blower (300).

The refrigerant passing through the indoor unit coil 320 is reduced in the heating expansion valve 230 and then flows into the outdoor unit main coil 220 that operates as an evaporator, and the refrigerant evaporates smoothly by the operation of the outdoor unit blower 270. The refrigerant passing through the outdoor unit main coil 220 passes through the four-way valve 210 and the accumulator 280 and flows back into the compressor 200 to complete the heating operation.

However, when the outdoor air condition that can form the frost is formed, the frost is frosted on the outdoor unit main coil 220, defrost is required. In this case, as shown in FIG. 3, some of the high-temperature and high-pressure refrigerant exiting the compressor 200 by the switching of the four-way valve 210 flows into the indoor unit main coil 220 and lands on the surface of the outdoor unit main coil 220. Melt frost At the same time, a part of the high temperature and high pressure refrigerant leaving the compressor 200 flows into the indoor unit coil 320 to simultaneously perform defrost and room heating.

The refrigerant passing through the outdoor unit main coil 220 and the refrigerant passing through the indoor unit coil 320 are combined at the front end of the heating expansion valve 235 and then the outdoor unit serving as an evaporator through the heating expansion valve 235 and the control valve 250. It is introduced into the auxiliary coil 260. The refrigerant evaporated from the outdoor unit auxiliary coil 260 is introduced into the multi-purpose compressor 200 via the control valve 250, the four-way valve 210, and the accumulator 280, and the defrosting and heating operation is completed.

However, in order to use the conventional heat pump as described above, a control valve 250 of 2-4 ports is required, but such a control valve is currently developed for refrigeration and air conditioning. The problem is that you have to invest in product development.

In addition, since the outdoor unit auxiliary coil 260 is not used for cooling and heating operation but is used only for defrosting and defrosting-heating operation, the outdoor unit auxiliary coil 260 has a disadvantage in that it is limitedly used.

In addition, the prior art has the disadvantage of not performing a role of preventing defrost in the state of being made in the state of the conception is made in advance.

Therefore, the present invention has been made to solve the conventional problems as described above, by installing a three-way valve that can be easily purchased in the refrigeration and air conditioning market in the front and rear of the outdoor unit auxiliary coil, the outdoor unit auxiliary according to the opening and closing method of the three-way valve By operating the coil as an evaporator or a condenser selectively regardless of cooling and heating operation, it is possible to provide a method to improve the performance of the heat pump as well as prevention of frosting by utilizing various outdoor auxiliary coils in conjunction with load fluctuations and outdoor conditions. The purpose.

In addition, the present invention improves the driving performance by increasing the condensation performance by using the outdoor unit auxiliary coil as a condenser during the cooling operation of the heat pump, while the outdoor unit auxiliary coil is reduced when the outdoor air temperature is increased to reduce the condensation effect of the outdoor unit main coil. It is an object of the present invention to provide a heat pump that can be used as an evaporator to improve operating performance through an increase in condensation effect.

In addition, the present invention improves the driving performance by increasing the evaporation performance by using the outdoor unit auxiliary coil as the evaporator during heating operation of the heat pump, while the outdoor unit auxiliary coil is reduced when the outdoor air temperature is lowered and the evaporation effect of the outdoor unit main coil is reduced. It is an object of the present invention to provide a heat pump that can be used as a condenser to improve operating performance by increasing the evaporation effect.

In addition, an object of the present invention is to provide a heat pump that can completely prevent the idea that occurs in the outdoor unit main coil during the heating operation of the heat pump.

A heat pump according to the present invention for achieving the above object is a compressor for compressing a refrigerant; A four-way valve for converting the refrigerant passing through the compressor into a heating or cooling circuit; An outdoor unit main coil which performs a role of a condenser in a cooling operation and an evaporator in a heating operation; An outdoor unit auxiliary coil disposed independently of the outdoor unit main coil and contributing to an improvement in heat transfer performance of the outdoor unit main coil; Three-way valves installed at front and rear ends of the outdoor unit auxiliary coils to change refrigerant flow directions; Outdoor unit for supplying outdoor air to the outdoor unit main coil and outdoor unit auxiliary coil

Blower; An expansion valve for reducing and reducing the refrigerant in accordance with heating or cooling operation; A check valve installed in parallel to the expansion valve and controlling the flow of the refrigerant in one direction; An indoor unit coil for performing heat exchange between the indoor air and the refrigerant; An indoor unit blower for supplying indoor air to the indoor unit coil; It characterized in that it comprises an accumulator for separating the liquid refrigerant flowing into the compressor.

In addition, the outdoor unit auxiliary coil may be used as a condenser when the condensation capacity of the outdoor unit main coil is insufficient during cooling operation, and when the outdoor air temperature is high and the condensation effect of the outdoor unit coil is lowered. do.

The outdoor unit auxiliary coil may be converted to a condenser when the evaporation capacity of the outdoor unit main coil is insufficient during heating operation, and when the evaporation effect of the outdoor unit coil is lowered due to a low outdoor air temperature. do.

In addition, during operation in winter heating, when the outdoor air is in a condition that can easily form the implantation, the outdoor unit auxiliary coil is always operated as a condenser by detecting the condition so that the warm air passing through the outdoor unit auxiliary coil is the main unit's main coil. It is characterized in that the anti-frosting operation to prevent the frost of the outdoor unit main coil to pass through.

In addition, the heat pump of the present invention is a compressor for compressing a refrigerant, a four-way valve for switching the operation mode, an outdoor unit main coil for performing heat exchange between the outdoor air and the refrigerant, and an indoor unit coil for performing heat exchange between the indoor air and the refrigerant And a heat pump configured to reduce and reduce the temperature of the refrigerant, the heat pump comprising: an outdoor unit auxiliary coil disposed independently of the outdoor unit main coil; And a first three-way valve and a second three-way valve installed at both ends of the outdoor unit auxiliary coil, wherein the outdoor unit auxiliary coil is selectively operated as an evaporator or a condenser according to the opening / closing method of the two three-way valves.

The apparatus may further include a means for detecting an implantation condition of the outdoor air, wherein the outdoor unit auxiliary coil always operates as a condenser when the outdoor air is in a condition in which formation can be easily formed.

The first three-way valve may be connected between one end of the outdoor unit auxiliary coil, a refrigerant outlet of the compressor, and a refrigerant inlet of the compressor, and the second three-way valve may include the other end of the outdoor unit auxiliary coil, It is characterized in that it is connected between one end of the outdoor unit main coil and one end of the indoor unit coil.

As described above, the heat pump according to the present invention may expect the following effects according to the outdoor unit auxiliary coil operating method.

When operating the heat pump in the summer, the outdoor unit auxiliary coil can be used as the condenser to improve the heat pump performance by increasing the condensation performance.

In addition, when the air temperature increases during the cooling operation, and the condensation effect of the outdoor unit main coil is reduced, the outdoor unit auxiliary coil can be used as the evaporator to improve the heat pump performance by increasing the condensation effect.

In addition, it is possible to improve the heat pump performance by increasing the evaporation performance by using the outdoor unit auxiliary coil as the evaporator when operating the winter heat pump as heating.

In addition, when the outdoor air temperature decreases during heating operation, and the evaporation effect of the outdoor unit main coil is reduced, the heat pump performance can be expected to be improved by increasing the evaporation effect by using the outdoor unit auxiliary coil as a condenser. It is possible to completely prevent conception that may occur in the main unit coil of the outdoor unit.

Referring to the heat pump operation method according to an embodiment of the present invention shown in the accompanying drawings as follows.

4 is a schematic diagram of an outdoor unit auxiliary coil operating as an evaporator when the heat pump according to the present invention is operated in cooling.
Heat pump according to the present invention is a compressor 500, outdoor unit main coil 520, outdoor unit auxiliary coil 530, outdoor unit blower 540, indoor unit coil 550, indoor unit blower 560, four-way valve 510, Refrigerant transfer line 700, the first three-way valve 570, the second three-way valve 580, heating expansion valve 580, cooling expansion valve 600, the first check valve 610, the second check valve ( 620, the accumulator 630 is configured.
The compressor 500 functions to compress the refrigerant.
The outdoor unit main coil 520 serves as a condenser in the cooling operation of the heat pump and serves as an evaporator in the heating operation.
The outdoor unit auxiliary coil 530 is independently installed in parallel with the outdoor unit main coil 520 to serve as an evaporator or a condenser.
The outdoor unit blower 540 functions to supply outdoor air to the outdoor unit main coil 520 and the outdoor unit auxiliary coil 530.
The indoor unit coil 550 functions to perform heat exchange between the indoor air and the refrigerant.
The indoor unit blower 560 functions to supply indoor air to the indoor unit coil 550.
The four-way valve 510 flows the refrigerant from the compressor 500 toward the outdoor unit main coil 520 or the indoor unit coil 550 to convert the entire refrigerant transfer line 700 of the heat pump into a heating circuit or a cooling circuit. To function.
The refrigerant transfer line functions to transfer the refrigerant, and the refrigerant transfer line connects the compressor 500 and the four-way valve 510 to flow refrigerant flowing through the compressor 500 toward the four-way valve 510. The first refrigerant line 701, the second refrigerant line 702 connecting the four-way valve 510 and the outdoor unit main coil 520, the third refrigerant line connecting the four-way valve 510 and the outdoor unit auxiliary coil 530 ( 703, the fourth refrigerant line 704 connecting the compressor 500 and the outdoor unit auxiliary coil 530, the fifth refrigerant line 705 connecting the four-way valve 510 and the indoor unit coil 550, the main unit coil The refrigerant coming out through the four-way valve 510 by connecting the seventh refrigerant line 707, the four-way valve 510, and the compressor 500 to connect the 520 and the indoor unit coil 550 to the compressor 500. And a ninth refrigerant line 709 branched from the eighth refrigerant line 708 and the sixth refrigerant line 706 to be connected to the seventh refrigerant line 707. It is configured to.
The first three-way valve 570 is installed at the point where the third refrigerant line 703 and the fourth refrigerant line 704 are connected to each other, and the second three-way valve 580 is the sixth refrigerant line 706 and the ninth. The refrigerant lines 709 are installed at points connected to each other.
The heating expansion valve 590 and the cooling expansion valve 600 function to reduce and reduce the refrigerant in accordance with the heating or cooling operation of the heat pump.
The first and second check valves 610 and 620 are installed in parallel to the expansion valve to control the flow of the refrigerant in one direction.
The accumulator 630 functions to separate the liquid refrigerant flowing into the compressor 500.
In addition, this refrigerant transfer line 700 is commonly applied to the configuration of the heat pump according to the embodiment of FIG. 5 to FIG.

As shown in FIG. 4, the high temperature and high pressure gas refrigerant from the compressor 500 is sent to the outdoor unit main coil 520 through the four-way valve 510. The outdoor air sucked through the rotation of the outdoor unit blower 540 passes through the outdoor unit auxiliary coil 530 and then heat-exchanges with the refrigerant of the outdoor unit main coil 520. At this time, the outdoor unit main coil 520 operates as a condenser. The refrigerant condensed in the outdoor unit main coil 520 receives heat from the indoor air sucked by the indoor unit blower 560 in the indoor unit coil 550 through the first check valve 610 and the cooling expansion valve 600 to evaporate. do. The gas refrigerant evaporated from the indoor unit coil 550 flows back into the compressor 500 through the four-way valve 510 and the accumulator 630.

Meanwhile, among the valves of the second three-way valve 580, the valve connected to the point B (the valve connected to the ninth refrigerant line) is opened, and the valve connected to the point C (the valve connected to the seventh refrigerant line) is controlled to open, thereby controlling the outdoor unit. Some of the refrigerant condensed in the main coil 520 flows into the outdoor unit auxiliary coil 530 at point C, and receives heat from outdoor air sucked through the outdoor unit blower 540 to evaporate. That is, the outdoor unit auxiliary coil 530 operates as an evaporator.

The outdoor unit is controlled to open the valve connected to the point A (the valve connected to the third refrigerant line) among the valves of the first three-way valve 570 and to close the valve connected to the four-way valve 510 (the valve connected to the fourth refrigerant line). The gas refrigerant passing through the auxiliary coil 530 flows toward the point A. At the point A, the gas is joined with the gas refrigerant passing through the indoor unit coil 550, and then flows into the compressor 500 through the accumulator 630.

As described above, the outdoor unit main coil 520 operates as a condenser, and when the outdoor air temperature sucked into the outdoor unit main coil 520 is high, the temperature difference between the refrigerant flowing along the outdoor unit main coil 520 and the air decreases, thereby reducing the condensation effect. do. In this case, when the outdoor unit auxiliary coil 530 is operated as an evaporator as described above, air cooled while passing through the outdoor unit auxiliary coil 530 flows into the outdoor unit main coil 520. Increasing the temperature difference can improve the condensation effect, improving the performance of the overall heat pump.

5 is a schematic diagram in which the outdoor unit auxiliary coil 530 operates as a condenser when the heat pump is operated in a cooling state.

Some of the high temperature and high pressure refrigerant from the compressor 500 branches and flows into the four-way valve 510, and the rest of the refrigerant flows toward the outdoor unit auxiliary coil 530. When the valve connected to the point A (the valve connected to the third refrigerant line) of the first three-way valve 570 is controlled to close, the high-temperature, high-pressure gas refrigerant flows along the outdoor unit auxiliary coil 530. The high temperature and high pressure gas refrigerant is condensed into the liquid refrigerant through heat exchange with air sucked by the outdoor unit blower 540 in the outdoor unit auxiliary coil 530. When the valve connected to the point C (the valve connected to the seventh refrigerant line) of the second three-way valve 580 is closed, the liquid refrigerant passing through the outdoor unit auxiliary coil 530 flows to the point B.

Meanwhile, the refrigerant flowing out of the compressor 500 into the four-way valve 510 flows into the outdoor unit main coil 520 and condenses, and then merges with the refrigerant passing through the outdoor unit auxiliary coil 530 at point B. The joined refrigerant flows into the indoor unit coil 550 via the first check valve 610 and the cooling expansion valve 600, passes through the accumulator 630, and flows into the compressor 500 through the evaporation process.

As described above, when the outdoor unit main coil 520 lacks the condensation capacity, the outdoor unit auxiliary coil 530 may be operated as a condenser to compensate for the insufficient condensation capacity, thereby improving the overall performance of the heat pump.

6 is a schematic diagram of an outdoor unit auxiliary coil operating as a condenser when the heat pump according to the present invention is operated by heating.

As shown in FIG. 6, some of the high-temperature, high-pressure refrigerant from the compressor 500 branches and flows into the indoor unit coil 550 via the four-way valve 510, and the rest of the refrigerant flows toward the outdoor unit auxiliary coil 530. When the valve connected to the point A (the valve connected to the third refrigerant line) of the first three-way valve 570 is controlled to close, the high-temperature, high-pressure gas refrigerant flows along the outdoor unit auxiliary coil 530. The high temperature and high pressure gas refrigerant is condensed into the liquid refrigerant through heat exchange with air sucked by the outdoor unit blower 540 in the outdoor unit auxiliary coil 530.

When the valve connected to the point B (the valve connected to the ninth refrigerant line) of the second three-way valve 580 is closed, the liquid refrigerant passing through the outdoor unit auxiliary coil 530 flows to the point C. The refrigerant flowing out of the compressor 500 and passing through the four-way valve 510 into the indoor unit coil 550 joins the liquid refrigerant passing through the outdoor unit auxiliary coil 530 at point C after undergoing a condensation process. The combined refrigerant flows into the outdoor unit main coil 520 through the second check valve 620 and the heating expansion valve 590, passes through the evaporation process, and then passes through the four-way valve 510 and the accumulator 630. As described above, the outdoor unit main coil 520 operates as an evaporator. When the outdoor air temperature sucked into the outdoor unit main coil 520 is low, the temperature difference between the refrigerant flowing along the outdoor unit main coil 520 and the air decreases. Evaporation effect is reduced. In this case, when the outdoor unit auxiliary coil 530 is operated as a condenser as described above, the heated air is introduced into the outdoor unit main coil 520 while passing through the outdoor unit auxiliary coil 530. In addition to improving the condensation effect by increasing the temperature difference, since the warm air is always supplied to the outdoor unit main coil 520, even when the outdoor air conditions that can form an imagination is not implanted in the outdoor unit main coil 520 However, the result can be remarkable, which can be operated without defrost.

Preferably, for the non-defrosting and defrosting operation, the sensor is provided with a sensing means for detecting an outdoor air condition (eg, temperature, humidity, etc.), and a condition for forming an implantation (eg, − 2 ~ 2 ℃) to control the three-way valve to always operate the outdoor unit auxiliary coil 530 as a condenser.

FIG. 8 is a graph showing results of performing a test according to the schematic diagram shown in FIG. 6 by making a 5-horsepower heat pump as an example.

As the result of operating the outdoor unit auxiliary coil 530 as a condenser at a dry bulb temperature of 0 ° C. and a relative humidity of 100%, which is most likely to occur, the outdoor unit main coil 520 did not occur even during 200 minutes of operation time. When the implantation occurs, the heat pump performance changes rapidly, but as can be seen in Figure 8, the performance and power consumption of the heat pump can be observed to remain constant for 200 minutes. One of the most technical problems to be solved in relation to the spread of the heat pump is known as the outdoor unit landing problem.

7 is a schematic diagram illustrating a case in which the outdoor unit auxiliary coil 530 operates as an evaporator during heating operation.

As shown in FIG. 7, the high temperature and high pressure refrigerant from the compressor 500 flows into the indoor unit coil 550 through the four-way valve 510 to heat the indoor space while performing the condensation process. The condensed refrigerant exiting the indoor unit coil 550 is not branched at the point C because the valve connected to the point C (the valve connected to the seventh refrigerant line) of the second three-way valve is closed, and the second check valve 620 and the heating expansion valve are not closed. After passing through 590, a part of the outdoor unit is branched to the outdoor unit main coil 520 and the other part is branched to the outdoor unit auxiliary coil 530. The refrigerant introduced into the outdoor unit main coil 520 and the outdoor unit auxiliary coil 530 performs an evaporation process, respectively.

The gas refrigerant exiting the outdoor unit auxiliary coil 530 flows toward the point A when the valve connected to the four-way valve 510 of the first three-way valve 570 is closed. The gas refrigerant passing through the outdoor unit main coil 520 merges with the refrigerant passing through the outdoor unit auxiliary coil 530 at the point A through the four-way valve 510 and then flows into the compressor 500 through the accumulator 630.

As described above, when the evaporation capacity of the outdoor unit main coil 520 is insufficient, the outdoor unit auxiliary coil 530 may be operated as an evaporator to compensate for the insufficient evaporation capability, thereby improving overall performance of the heat pump.

As described above, the present invention can improve the performance of the heat pump by using a three-way valve for switching the refrigerant circuit so that the outdoor unit auxiliary coil can be selectively switched to the condenser or the evaporator according to the load and the outdoor air temperature and humidity conditions in the heat pump. In particular, the basic technical idea is to be able to heat the indoor space while preventing the frosting on the main unit's main coil perfectly under the outdoor air condition, which may occur during winter heating operation.

Although the present invention has been described above by using a preferred embodiment of the present invention, the principles of the present invention are not limited by the scope described in the above embodiments, and those skilled in the art can make various modifications within the technical scope defined by the claims. Modifications may be made and such modifications should also be construed as falling within the scope of the present invention.

1 is a schematic view of a heat pump according to the prior art

2 is a heat pump heating operation method according to the prior art

3 is a heat pump defrosting and heating operation method according to the prior art

Figure 4 is a schematic diagram of the cooling (outdoor air auxiliary coil evaporator) operation of the heat pump according to the present invention

Figure 5 is a schematic diagram of the cooling (outdoor air auxiliary coil condenser) operation of the heat pump according to the present invention

Figure 6 is a schematic view of the heating (outdoor air auxiliary coil condenser) operation of the heat pump according to the present invention

7 is a schematic view of the heating (outdoor air auxiliary coil evaporator) operation of the heat pump according to the present invention

8 is an example of the result of the implantation condition (dry bulb temperature 0 ℃, relative humidity 100%) of the heat pump according to the present invention

<Description of the symbols for the main parts of the drawings>

                   500: compressor 510: four-way valve

520: outdoor unit main coil 530: outdoor unit auxiliary coil

540: outdoor unit blower 550: indoor unit coil

560: indoor unit blower 570: first three-way valve

580: second three-way valve 590: heating expansion valve 600: cooling expansion valve 610: first check valve

620: second check valve 630: accumulator

Claims (7)

delete A compressor for compressing the refrigerant; An outdoor unit main coil which performs a role of a condenser in a cooling operation and an evaporator in a heating operation; An outdoor unit auxiliary coil installed in parallel with the outdoor unit main coil and serving as an evaporator or a condenser; An outdoor unit blower for supplying outdoor air to the outdoor unit main coil and the outdoor unit auxiliary coil; An indoor unit coil for performing heat exchange between the indoor air and the refrigerant; An indoor unit blower for supplying indoor air to the indoor unit coil; Four-way valve for flowing the refrigerant from the compressor to the outdoor unit main coil or the indoor unit coil direction to switch the entire refrigerant transfer line of the heat pump to a heating circuit or a cooling circuit; A first refrigerant line for connecting the compressor and the four-way valve to flow the refrigerant flowing through the compressor in the direction of the four-way valve, a second refrigerant line for connecting the four-way valve and the main unit coil, the four-way valve and the outdoor unit auxiliary coil A third refrigerant line connecting the compressor, a fourth refrigerant line connecting the compressor and the outdoor unit auxiliary coil, a fifth refrigerant line connecting the four-way valve and the indoor unit coil, and a seventh refrigerant line connecting the outdoor unit main coil and the indoor unit coil. And an eighth refrigerant line connecting the four-way valve and the compressor to flow refrigerant flowing through the four-way valve toward the compressor, and a ninth refrigerant line branched from the sixth refrigerant line and connected to the seventh refrigerant line. Refrigerant transfer line comprising; A first three-way valve installed at a point where the third refrigerant line and the fourth refrigerant line are connected to each other; A second three-way valve installed at a point where the sixth and ninth refrigerant lines are connected to each other; Expansion valves for reducing or reducing the refrigerant in accordance with the heating or cooling operation; Check valves installed in parallel to the expansion valve to control the flow of the refrigerant in one direction; It includes an accumulator for separating the liquid refrigerant flowing into the compressor, In the cooling operation of the heat pump, the first three-way valve is operated while the connection side with the outdoor unit auxiliary coil and the connection side with the third refrigerant line are opened, and the connection side with the fourth refrigerant line is blocked. The second three-way valve is operated while the connection side with the outdoor unit auxiliary coil and the connection side with the seventh refrigerant line are opened, and the connection side with the ninth refrigerant line is blocked, so that the outdoor unit auxiliary coil operates as an evaporator. Alternatively, the first three-way valve is operated in a state where the connection side with the outdoor unit auxiliary coil and the connection side with the fourth refrigerant line are opened, and the connection side with the third refrigerant line is blocked, and the second three-way valve The connection side with the outdoor unit auxiliary coil and the connection side with the ninth refrigerant line are respectively opened and simultaneously with the seventh refrigerant line. Is to operate in cut-off state is the heat pump characterized in that the outdoor unit is operating as a condenser and the secondary coil. A compressor for compressing the refrigerant; An outdoor unit main coil which performs a role of a condenser in a cooling operation and an evaporator in a heating operation; An outdoor unit auxiliary coil installed in parallel with the outdoor unit main coil and serving as an evaporator or a condenser; An outdoor unit blower for supplying outdoor air to the outdoor unit main coil and the outdoor unit auxiliary coil; An indoor unit coil for performing heat exchange between the indoor air and the refrigerant; An indoor unit blower for supplying indoor air to the indoor unit coil; Four-way valve for flowing the refrigerant from the compressor to the outdoor unit main coil or the indoor unit coil direction to switch the entire refrigerant transfer line of the heat pump to a heating circuit or a cooling circuit; A first refrigerant line for connecting the compressor and the four-way valve to flow the refrigerant flowing through the compressor in the direction of the four-way valve, a second refrigerant line for connecting the four-way valve and the main unit coil, the four-way valve and the outdoor unit auxiliary coil A third refrigerant line connecting the compressor, a fourth refrigerant line connecting the compressor and the outdoor unit auxiliary coil, a fifth refrigerant line connecting the four-way valve and the indoor unit coil, and a seventh refrigerant line connecting the outdoor unit main coil and the indoor unit coil. And an eighth refrigerant line connecting the four-way valve and the compressor to flow refrigerant flowing through the four-way valve toward the compressor, and a ninth refrigerant line branched from the sixth refrigerant line and connected to the seventh refrigerant line. Refrigerant transfer line comprising; A first three-way valve installed at a point where the third refrigerant line and the fourth refrigerant line are connected to each other; A second three-way valve installed at a point where the sixth and ninth refrigerant lines are connected to each other; Expansion valves for reducing or reducing the refrigerant in accordance with the heating or cooling operation; Check valves installed in parallel to the expansion valve to control the flow of the refrigerant in one direction; It includes an accumulator for separating the liquid refrigerant flowing into the compressor, During the heating operation of the heat pump, the first three-way valve is operated while the connection side with the outdoor unit auxiliary coil and the connection side with the fourth refrigerant line are opened, and the connection side with the third refrigerant line is blocked. The second three-way valve is operated while the connection side with the outdoor unit auxiliary coil and the connection side with the seventh refrigerant line are opened, and the connection side with the ninth refrigerant line is blocked, so that the outdoor unit auxiliary coil operates as a condenser. Alternatively, the first three-way valve is operated in a state where the connection side with the outdoor unit auxiliary coil and the connection side with the third refrigerant line are opened, and the connection side with the fourth refrigerant line is blocked, and the second three-way valve The connection side with the outdoor unit auxiliary coil and the connection side with the ninth refrigerant line are respectively opened and simultaneously with the seventh refrigerant line. The side of the heat pump is operated in the blocked state, characterized in that the outdoor unit auxiliary coil operates as an evaporator. The method of claim 3 When operating with winter heating, when the outdoor air is in a condition that can easily form an implant, the condition is sensed and the outdoor unit auxiliary coil is always operated as a condenser so that warm air passing through the outdoor unit auxiliary coil passes through the outdoor unit main coil. The heat pump is characterized in that the anti-frosting operation to prevent the outdoor unit main coil from being implanted. The outdoor unit main coil or the indoor unit coil which compresses the refrigerant, the outdoor unit main coil which performs heat exchange between the outdoor air and the refrigerant, the indoor unit coil which performs heat exchange between the indoor air and the refrigerant, and the refrigerant passing through the compressor. In the heat pump comprising a four-way valve for flowing the direction of the refrigerant pump line of the heat pump to the heating circuit or cooling circuit, and the expansion valve for reducing the temperature and pressure of the refrigerant, An outdoor unit auxiliary coil disposed independently of the outdoor unit main coil and operating as a condenser or an evaporator, and a first refrigerant line connecting the compressor and the four-way valve to flow the refrigerant passing through the compressor in the four-way valve direction; Second refrigerant line connecting the four-way valve and the outdoor unit main coil Third refrigerant line connecting the four-way valve and the outdoor unit auxiliary coil Fourth refrigerant line connecting the compressor and the outdoor unit auxiliary coil Fourth line connecting the four-way valve and the indoor unit coil 5 Refrigerant line The seventh refrigerant line connecting the outdoor unit main coil and the indoor unit coil The eighth refrigerant line connecting the four-way valve and the compressor to flow the refrigerant flowing through the four-way valve toward the compressor in the sixth refrigerant line A cold branch comprising a ninth refrigerant line branched to be connected to the seventh refrigerant line A first three-way valve installed at every transfer line, a point at which the third refrigerant line and a fourth refrigerant line are connected to each other, and a second three way installed at a point at which the sixth and ninth refrigerant lines are connected to each other; Further comprising a valve, In the cooling operation of the heat pump, the first three-way valve is connected to the outdoor unit auxiliary coil and the third refrigerant line, respectively, while the connection side is connected to the fourth refrigerant line. The second three-way valve is operated while the connection side with the outdoor unit auxiliary coil and the connection side with the seventh refrigerant line are opened, and the connection side with the ninth refrigerant line is cut off, or during heating operation of the heat pump. The first three-way valve is connected to the outdoor unit auxiliary coil and the third refrigerant line is connected to each other while the connection side to the fourth refrigerant line is operated while the second three-way valve is The connection side with the outdoor unit auxiliary coil and the connection side with the ninth refrigerant line are respectively opened, and the connection side with the seventh refrigerant line is blocked. State during operation, and the outdoor sub-coil is functioning as an evaporator, During the cooling operation of the heat pump, the first three-way valve is connected to the outdoor unit auxiliary coil and the fourth refrigerant line, respectively, and the third refrigerant line is connected to the third refrigerant line. The second three-way valve is operated while the connection side with the outdoor unit auxiliary coil and the connection side with the ninth refrigerant line are opened, and the connection side with the seventh refrigerant line is cut off, or during heating operation of the heat pump. The first three-way valve is operated in a state in which the connection side with the outdoor unit auxiliary coil and the connection side with the third refrigerant line are opened, and the connection side with the fourth refrigerant line is blocked, and the second three-way valve is The connection side to the outdoor unit auxiliary coil and the connection side to the ninth refrigerant line are respectively opened, and the connection side to the seventh refrigerant line is blocked. When operating in the state, the heat pump characterized in that the outdoor unit auxiliary coil operates as a condenser. The method of claim 5, Means for detecting an implantation condition of the outdoor air, And the outdoor unit auxiliary coil always operates as a condenser when the outdoor air is in a condition in which frost can be easily formed. delete

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