KR100846266B1 - Air conditioner - Google Patents

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Publication number
KR100846266B1
KR100846266B1 KR1020070079848A KR20070079848A KR100846266B1 KR 100846266 B1 KR100846266 B1 KR 100846266B1 KR 1020070079848 A KR1020070079848 A KR 1020070079848A KR 20070079848 A KR20070079848 A KR 20070079848A KR 100846266 B1 KR100846266 B1 KR 100846266B1
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South Korea
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heat exchanger
defrosting
outdoor
heating operation
refrigerant
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KR1020070079848A
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Korean (ko)
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KR20080023106A (en
Inventor
마꼬또 오구리
마사히꼬 와따나베
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히타치 어플라이언스 가부시키가이샤
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Priority to JP2006242740A priority Critical patent/JP4272224B2/en
Priority to JPJP-P-2006-00242740 priority
Application filed by 히타치 어플라이언스 가부시키가이샤 filed Critical 히타치 어플라이언스 가부시키가이샤
Publication of KR20080023106A publication Critical patent/KR20080023106A/en
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Abstract

The object of the present invention is to shorten defrosting time while ensuring indoor comfort by performing defrosting simultaneously with heating in an air conditioner.
The air conditioner has a refrigeration cycle in which a compressor 75, a four-way valve 72, an indoor heat exchanger 33, a decompression device 74 and an outdoor heat exchanger 73 are connected by a refrigerant pipe, And a bypass circuit for allowing the hot gas to flow from the outdoor heat exchanger (73) to the outdoor heat exchanger (73). The outdoor heat exchanger 73 divides the refrigerant circuit vertically into two and constitutes an upper heat exchanger 731 that is larger than the lower heat exchanger 732 and the lower heat exchanger 732. The controller 10 opens and closes the main circuit opening and closing mechanisms 713a and 713b and the bypass open / close valves 715a and 715b in the opposite direction to defrost the upper heat exchanger 731 while defrosting the lower heat exchanger 732 After the heating operation, the lower heat exchanger 732 is defrosted while the upper heat exchanger 731 is heating.
Air conditioner, compressor, four-way valve, indoor heat exchanger, decompression device

Description

AIR CONDITIONER

The present invention relates to an air conditioner, and more particularly to an air conditioner that simultaneously performs defrosting of an outdoor heat exchanger and indoor heating.

Air heat source heat pump When the air conditioner is heated, if the humidity of the outdoor air is high, the outdoor heat exchanger is concealed. The amount of outdoor air circulating through the outdoor heat exchanger is reduced because the ventilation path of the outdoor heat exchanger becomes narrow. When the amount of circulating outdoor air is reduced, the amount of heat exchange is reduced, so that the evaporation temperature of the refrigerant flowing in the outdoor heat exchanger is lowered to compensate for this. When the evaporation temperature of the refrigerant decreases, the surface temperature of the outdoor side of the outdoor heat exchanger also decreases, and consequently, the conception is more likely to occur and the conception is progressed. In this state, since the amount of heat drawn from the outdoor air in the outdoor heat exchanger is reduced, the amount of heat radiated from the indoor heat exchanger is also reduced, so that the heating capacity is also reduced and the indoor comfort is impaired. In order to prevent this, when the amount of impregnation of the outdoor heat exchanger exceeds a predetermined amount, the defrosting operation is performed to melt the impregnation of the outdoor heat exchanger.

BACKGROUND ART Conventionally known as a defrosting system is an inverse cycle defrosting system. This is because, when defrosting is required during the heating operation, the heating cycle is switched to the refrigeration cycle, and the compressor and the indoor unit are used as the heat source and the hot gas refrigerant from the compressor flows in the outdoor heat exchanger to defrost.

In addition, Japanese Laid-Open Patent Publication No. 09-318206 (Patent Document 1), Japanese Patent Application Laid-Open No. 2001-059664 (Patent Document 2), Japanese Laid-Open Patent Publication Japanese Patent Application Laid-Open No. 2002-188873 (Patent Document 3), and Japanese Patent Application Laid-Open No. 04-110576 (Patent Document 4).

Patent Document 1 discloses a heat pump type air conditioner in which an outdoor heat exchanger serves as an evaporator during heating operation and an indoor heat exchanger serves as a condenser to heat the room, wherein the outdoor heat exchanger is divided into a plurality of parts in the vertical direction, Each of the outdoor heat exchangers is piped in parallel to the indoor heat exchanger and piped to the suction port side of the compressor through the respective one of the outdoor valves and the outlet port side of the compressor is branched to connect the outdoor heat exchangers to the outdoor heat exchangers through piping And when the defrosting operation is performed during the heating operation, a part of the discharge gas from the compressor is sequentially switched from the upper side to the lower side to each of the divided outdoor heat exchangers to perform heating and defrosting in parallel.

Patent Document 2 discloses an air conditioner in which a compressor, a four-way valve, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger are connected by a refrigerant pipe to constitute a refrigeration cycle. The outdoor heat exchanger is connected to the outdoor heat exchanger The air flow generated by the outdoor heat exchanger is divided into two rows and the expansion valves are connected in parallel to each other. In addition, an open / close valve is provided between the discharge side piping of the compressor and the inlet side piping And a high-capacity heating operation, a low-capacity heating operation, and a simultaneous operation of defrosting and heating are performed.

Patent Document 3 discloses an outdoor heat exchanger having an outdoor heat exchanger in which a plurality of divided heat exchangers are connected in parallel, and a refrigeration cycle capable of heating operation which is constituted by connecting a compressor, a four-way valve, an indoor heat exchanger, And a bypass line for guiding the discharge gas discharged from the compressor to the inlet of each of the heat exchangers serving as an inlet during the heating operation of the outdoor heat exchanger and opening and closing means for opening and closing each outlet through the bypass, , Means for detecting the conception of the outdoor heat exchanger to each heat exchanger, and means for controlling the opening / closing means in accordance with the detection result at the time of heating operation to introduce the discharged gas from the compressor into the concealed heat exchanger .

Patent Document 4 discloses a refrigeration cycle in which the compressor, the four-way valve for switching the flow path, the two outdoor heat exchangers connected in parallel, the decompression device capable of switching the cooling and heating, and the indoor heat exchanger are successively connected by piping to constitute a refrigeration cycle Wherein two bypass pipes each having an on-off valve are branched from the discharge side of the compressor, and the two bypass pipes are connected to the outdoor heat exchanger And the two outdoor heat exchangers are alternately opened and closed by alternately opening and closing the open / close valves provided in the respective bypass pipes in the defrosting operation, so that the two outdoor heat exchangers are alternately defrosted .

[Patent Document 1] JP-A-09-318206

[Patent Document 2] Japanese Unexamined Patent Application Publication No. 2001-059664

[Patent Document 3] Japanese Patent Laid-Open No. 04-110576

[Patent Document 4] JP-A-2002-188873

It is necessary to start the defrosting before the room temperature reaches the set temperature. In the air conditioner of the above-described reverse-cycle defrosting mode, the heating operation is stopped and the reverse-cycle defrosting operation is stopped There has been a problem in that the room temperature is greatly lowered during defrosting to deteriorate the comfort and the time until the room temperature reaches the set temperature is long.

In the air conditioner disclosed in Patent Document 1, since the defrosting is always performed during the heating operation, there has been a problem that the room is heated while the heating ability is always lowered. In addition, since the defrosting of the minimum portion of the three divided outdoor heat exchangers is sequentially switched, there is a problem that the defrosting time is long.

In the air conditioner of Patent Documents 2 and 3, since the outdoor heat exchanger is divided into the front and rear two rows for the air flow and alternately defrosted, the melted water generated by one defrost in the separated outdoor heat exchanger It can not be used for fusion of the side frost, and there is a problem that defrosting can not be efficiently performed in a short time.

In the air conditioner of Patent Document 4, since the outdoor heat exchanger is separated from the flow of air to separate the left and right from the flow of the air, the defrost water generated by defrosting by one defroster in the separated outdoor heat exchanger is melted There is a problem that defrosting can not be efficiently performed in a short time.

An object of the present invention is to provide an air conditioner capable of shortening a defrosting time while ensuring indoor comfort by performing defrosting simultaneously with heating.

In order to achieve the above object, the present invention provides a refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, a decompression device, and an outdoor heat exchanger are connected by a refrigerant pipe to constitute a refrigeration cycle, and the outdoor heat exchanger is divided into two and connected in parallel At the same time, a main circuit opening / closing mechanism is provided at the inlet side of the refrigerant circuit of each of the two outdoor heat exchangers divided into the two, and the refrigerant circuit of the refrigerant circuit of each of the two outdoor heat exchangers An air conditioner provided with a hot gas bypass circuit for connecting an inlet side and a control device for controlling operation by providing a bypass opening / closing valve in a hot gas bypass circuit, said outdoor heat exchanger comprising: The upper and lower heat exchangers are divided into two upper and lower heat exchangers to constitute an upper heat exchanger larger than the lower heat exchanger, When the defrosting operation is started during the heating operation, the main circuit opening / closing mechanism and the bypass opening / closing valve are reversely opened and closed, and after the defrosting operation and the heating operation in which the lower heat exchanger is defrosting while defrosting the upper heat exchanger, A defrosting / heating operation for heating the upper heat exchanger while defrosting the heat exchanger, and returning to the heating operation after completion of the defrosting / heating operation.

A more preferred specific configuration example of the present invention is as follows.

(1) The control device defrosts the lower heat exchanger and defrosts the upper heat exchanger while heating the lower heat exchanger while defrosting the upper heat exchanger. To do.

(2) The air conditioner according to any one of (1) to (4), wherein the defrosting prohibition period when the outside air temperature is 0 캜 or higher is made to be equal to or smaller than the following formula (1) using a compressor having a steel shell.

[Formula 1]

Defrosting period (unit: minute) = 8 × mass of compressor (unit: kg) / heat absorbed by outdoor heat exchanger (unit: ㎾)

(3) The defrosting prohibition period is set to 20 minutes to 5 minutes.

(4) The control device performs control to shift the discharge temperature of the compressor to the high temperature side and to control the defrosting prohibition period on the basis of the decrease in the outside air temperature.

(5) The control device controls the rotation speed of the outdoor air blowing device during the defrosting / heating operation to be lower than that during the heating operation and stops the operation of the outdoor air blowing device during the defrosting operation when the outdoor air temperature is lower than the predetermined value To do.

(6) When the temperature of the outdoor heat exchanger does not reach the predetermined value even if the defrosting / heating operation is performed until the defrosting operation time is reached, the control device switches the four-way valve to perform the reverse-cycle defrosting operation Control.

According to the air conditioner of the present invention, the defrosting time can be shortened while ensuring the comfort of the room by performing the defrosting simultaneously with the heating.

Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

First, the overall structure of the air conditioner of this embodiment will be described with reference to Figs. 1 and 2. Fig. 1 is a configuration diagram of an air conditioner according to an embodiment of the present invention. Fig. 2 is a diagram illustrating a refrigeration cycle of the air conditioner of Fig. 1. Fig.

The air conditioner 1 includes a refrigeration cycle, a blower, and a control system for controlling them. The air conditioner 1 is a separate type air conditioner connected to the indoor unit 2 and the outdoor unit 6 through a refrigerant pipe 8, electric wiring, signal wiring, and the like.

The refrigeration cycle includes a compressor 75, a four-way valve 72, an outdoor heat exchanger 73, main circuit opening / closing valves 713a and 713b, a decompression device 74, a hot pipe 713d, an indoor heat exchanger 33, And bypass opening / closing valves 715a and 715b, which are connected to each other through a refrigerant pipe. The refrigerant pipe includes a suction pipe 710, a discharge pipe 711, a use gas pipe 712, a liquid pipe 713, a heat source gas pipe 714, a hot gas bypass pipe 715, a hot pipe 713d, A bypass pipe 716a, a lower bypass pipe 716b, and the like.

The indoor heat exchanger 33 is accommodated in the indoor unit 2 and includes a compressor 75, a four-way valve 72, an outdoor heat exchanger 73, main circuit on / off valves 713a and 713b, (713d) and bypass opening / closing valves (715a, 715b) are stored in the outdoor unit (6).

The four-way valve 72 is an example of a refrigerant flow switching valve. The four-way valve 72 switches the cooling cycle and the heating cycle. Here, the cooling cycle is a cycle in which the refrigerant discharged from the compressor 75 through the discharge pipe 711 is led to the outdoor heat exchanger 73 and the refrigerant from the indoor heat exchanger 33 is returned to the compressor 75 . The heating cycle leads the refrigerant discharged from the compressor 75 to the indoor heat exchanger 33 and returns the refrigerant from the outdoor heat exchanger 73 to the compressor 75 through the suction pipe 710 and the accumulator 76 .

Therefore, the outdoor heat exchanger 73 constitutes a high-pressure-side heat exchanger (condenser) in the cooling operation of the cooling cycle and constitutes a low-pressure-side heat exchanger (evaporator) in the heating operation of the heating cycle. The indoor heat exchanger 33 constitutes a high-pressure side heat exchanger (condenser) in the heating operation of the heating cycle and constitutes a low-pressure side heat exchanger (evaporator) in the cooling operation of the cooling cycle.

The outdoor heat exchanger (73) is composed of a refrigerant pipe and a heat exchange fin, and a refrigerant circuit formed by the refrigerant pipe is divided into a plurality of parts and connected in parallel. This refrigerant circuit is divided into two refrigerant circuits: an upper refrigerant circuit and a lower refrigerant circuit. The outdoor heat exchanger 73 is composed of an upper heat exchanger 731 including an upper refrigerant circuit and a lower heat exchanger 732 including a lower refrigerant circuit. The upper heat exchanger 731 has a first upper refrigerant circuit 731a, a second upper refrigerant circuit 731b, and a third upper refrigerant circuit 731c. The lower heat exchanger 732 has a first lower refrigerant circuit 732a and a second lower refrigerant circuit 732b.

Each of the upper heat exchanger 731 and the lower heat exchanger 732 is connected to the pressure reducing device 74 via the main circuit opening / closing valves 713a and 713b. The refrigerant is branched from the upper heat exchanger 731 and the lower heat exchanger 732 and between the main circuit on-off valves 713a and 713b and is discharged from the discharge pipe 711 of the compressor 75 via the bypass on- A hot gas bypass circuit connected to the hot gas bypass pipe 715 is provided.

The decompression device 74 is provided between the outdoor heat exchanger 73 and the indoor heat exchanger 33 to decompress the refrigerant from the outdoor heat exchanger 73 at the time of cooling in the cooling cycle, And the refrigerant from the indoor heat exchanger (33) is decompressed. Further, in the present embodiment, the pressure reducing device 74 is constituted by an expansion valve capable of controlling the throttle opening degree, for example, an electric type.

The main circuit opening / closing valves 713a and 713b and the bypass opening / closing valves 715a and 715b are constituted by an electronic opening / closing valve and open / close the main circuit of the refrigerant and the hot gas bypass circuit.

The air blowing device in the air conditioner 1 includes an outdoor air blowing device 63 housed in an outdoor unit 6 and an indoor air blowing device 31 housed in an indoor unit 2. [ The outdoor air blowing apparatus includes an outdoor fan 631 for circulating outdoor air to the outdoor heat exchanger 73 and an outdoor air blowing motor 633 for driving the outdoor fan 631. The indoor air blowing apparatus includes an indoor fan 311 for circulating indoor air to the indoor heat exchanger 33 and an indoor air blowing motor 313 for driving the indoor fan 311. In this embodiment, an axial fan is used as the outdoor fan 631, and a horizontal fan is used as the indoor fan 311.

The control system in the air conditioner 1 includes refrigerant on / off sensors 811a, 811b and 812 and a control device 10. [ The refrigerant on-detection sensors 811a, 811b and 812 are provided with refrigerant on / off sensors 811a and 811b for detecting the outlet temperatures of the upper heat exchanger 731 and the lower heat exchanger 732 of the outdoor heat exchanger 73 during heating, And a refrigerant on-detection sensor 812 for detecting the outlet temperature of the outdoor heat exchanger 73 at the time of reverse cycle defrost.

The control device 10 controls the compressor 75, the four-way valve 72, the outdoor air blowing motor 633, the indoor air blowing motor 631, the indoor air blowing motor 633, Control valve 313, pressure reducing device 74, main circuit on / off valves 713a and 713b, bypass on / off valves 715a and 715b, and the like. In the present embodiment, the control device 10 has a control device having a function of calculating and a control device having a function of controlling each device. However, the control device 10 may be divided into two, or each device may be controlled May be further divided into a plurality of control devices.

Next, the operation of the air conditioner 1 will be described with reference to Figs. 3 to 8. Fig.

First, the cooling operation in the cooling cycle will be described with reference to Fig. Fig. 4 is a refrigerating cycle chart showing the flow of refrigerant during the cooling operation of the air conditioner of Fig. 1; Fig. The four-way valve 72 is switched as shown in Fig. 4 to open the main circuit on / off valves 713a and 713b, and the bypass on / off valves 715a and 715b are closed The compressor 75, the outdoor air blowing motor 633, and the indoor air blowing motor 313 are operated.

The gas refrigerant sucked into the compressor 75 is compressed by the compressor 75 and flows into the gas refrigerant of high temperature and high pressure and flows in the direction of the solid line arrows of Fig. 4 and flows through the outdoor heat exchanger 73 The refrigerant enters the upper heat exchanger 731 and the lower heat exchanger 732 of the outdoor heat exchanger 731, and is heat-exchanged with the outdoor air to be cooled and condensed to become liquid or gas-liquid mixed refrigerant.

Subsequently, the refrigerant enters the decompression device 74 through the main circuit opening / closing valves 713a and 713b, expands and is decompressed to become a low-pressure gas-liquid mixture refrigerant. The gas-liquid mixed refrigerant flows in the direction indicated by the broken line arrow indicating the flow of the low-pressure refrigerant in FIG. 4, passes through the hot pipe 713d and then flows out of the outdoor unit 6 to enter the indoor unit 2, Enters the compressor (33), exchanges heat with indoor air to cool the room, and is heated to become a gas refrigerant and returned to the compressor (75).

Next, the heating operation in the heating cycle will be described with reference to Fig. Fig. 5 is a refrigerating cycle chart showing the flow of refrigerant during the heating operation of the air conditioner of Fig. 1; Fig. When the heating operation is performed, the four-way valve 72 is switched as shown in Fig. 5, the main circuit open / close valves 713a and 713b are opened, the bypass open / close valves 715a and 715b are closed, The compressor 75, the outdoor air blowing motor 633, and the indoor air blowing motor 313 are operated.

The gas refrigerant sucked into the compressor 75 is compressed by the compressor 75 to be a gas refrigerant of high temperature and high pressure and flows in the direction of a solid line arrow in Fig. 5, passes through the four- way valve 72, 33, and is heat-exchanged with room air, cooled and condensed to become liquid or gas-liquid mixed refrigerant.

The refrigerant that has condensed and becomes a refrigerant in a liquid or gas-liquid mixture enters the outdoor unit 6 through the indoor unit 2 and flows through the hot pipe 713d disposed near the outlet of the outdoor heat exchanger 73 or near the outlet of the defrost water, The ice cubes that have fallen during the operation are melted and completely discharged to the outside of the outdoor unit 6, so that no residual frost is generated in the outdoor unit 6. The refrigerant that has passed through the hot pipe 713d enters the decompression device 74, expands and is decompressed to become a low-pressure gas-liquid mixture refrigerant. The gas-liquid mixed refrigerant flows in the direction of the broken line arrow indicating the flow of the low-pressure refrigerant in FIG. 5 and flows through the upper circuit heat exchanger 731 and the lower side heat exchanger 731 of the outdoor heat exchanger 73, which is an evaporator, through the main circuit opening / closing valves 713a and 713b Enters the heat exchanger 732, is heated by heat exchange with outdoor air, becomes a gas refrigerant, and is returned to the compressor 75.

By repeating the heating operation in the above-described heating cycle, the heating operation continues.

In such a heating operation, the outdoor heat exchanger 73 takes heat from the outdoor air, so that it becomes low temperature, becomes 0 DEG C or less, and may be conceived on the heat transfer surface. If the temperature of the outside air is low and the humidity is high, this phenomenon becomes prominent, and the flow of outdoor air is disturbed by the frost attached to the flow surface of the outdoor air, thereby reducing the air volume of the outdoor fan 631. When the air flow rate of the outdoor fan 631 is reduced, the temperature of the outdoor heat exchanger 73 is further lowered to make it easier to adhere to the frost. In this way, the conception of the outdoor heat exchanger 73 continues to increase, the amount of heat drawn by the air conditioner 1 from the outdoor air is reduced, and the heating capacity is also reduced, The defrosting operation becomes necessary.

Next, defrosting and heating operation in a heating cycle will be described with reference to Figs. 6 and 7. Fig. FIG. 6 is a refrigerating cycle chart showing the flow of refrigerant when defrosting the upper portion of the outdoor heat exchanger of the air conditioner of FIG. 1; and FIG. 7 is a refrigerating cycle chart of the refrigerant when defrosting the lower portion of the outdoor heat exchanger of the air conditioner of FIG. Fig.

As described above, when the heating operation is performed, the outdoor heat exchanger (73) is frosted on the day when there is a lot of moisture, and the heating ability is deteriorated. When the refrigerant-on-solid state sensor 812 is under the predetermined temperature and the heating operation in the heating cycle is performed for a predetermined time or more, it is regarded that the amount of the frosting has reached the predetermined amount, . This defrosting operation closes the main circuit on / off valve 713a, opens the main circuit on / off valve 713b, and opens the bypass on / off valve 715a in the same manner as in the heating operation, The upper heat exchanger 731 in the outdoor heat exchanger 73 functions as a condenser and the lower heat exchanger 732 functions as an evaporator while the bypass open / close valve 715b is closed, A defrosting / heating operation cycle is performed. At this time, the outdoor air blowing motor 633 is operated at low speed and the indoor air blowing motor 313 controls the operation so that the blowing out temperature can be maintained at a predetermined temperature or more.

Here, the gas refrigerant sucked into the compressor 75 is compressed by the compressor 75, becomes a gas refrigerant of high temperature and high pressure, is discharged into the discharge pipe 711 and is branched in the middle, the one refrigerant enters the four-way valve 72, The other refrigerant enters the hot gas bypass pipe 715.

One of the refrigerants entering the four-way valve 72 flows in the direction indicated by the solid line arrows in FIG. 6, enters the indoor heat exchanger 33, exchanges heat with the room air, and is cooled and condensed to become a liquid or vapor-liquid refrigerant. At this time, indoor heating is performed. The refrigerant that has become the refrigerant of the liquid or gas-liquid mixture flows out of the indoor unit 2, enters the outdoor unit 6, flows through the hot pipe 713d, melts the surrounding ice pieces and discharges them to the outside of the outdoor unit 6. The refrigerant that has passed through the hot pipe 713d enters the decompression device 74, is expanded and decompressed, and becomes a refrigerant of a low-pressure gas-liquid mixture. 6, flows into the lower heat exchanger 732 of the outdoor heat exchanger 73 which becomes an evaporator through the main circuit opening / closing valve 713b, Is heated by heat exchange with the air, becomes gas refrigerant, and is returned to the compressor (75).

6, flows into the upper heat exchanger 731 of the outdoor heat exchanger 73 through the bypass open / close valve 715a. Since the refrigerant entered into the upper heat exchanger 731 is high in temperature and high pressure, the frost attached to the upper heat exchanger 731 is melted downward. The lowered molten water flows into the lower heat exchanger 732 serving as an evaporator and is initially lowered while melting the conformation of the lower heat exchanger 732 and becomes lower in temperature as it is lowered, Finally, re-freeze.

At this time, the molten water flows down while giving heat to the lower heat exchanger 732, and the heat promotes vaporization of the refrigerant in the lower heat exchanger 732. That is, a part of the heat used in the melting of the frozen phase in the upper heat exchanger 731 partially melts the frosting of the lower heat exchanger 732, is recovered by contributing to the vaporization of the internal refrigerant, and the amount of heat of defrosting is effectively used .

The refrigerant defrosting the frost of the upper heat exchanger 731 exits the upper heat exchanger 731, merges with the refrigerant vaporized in the lower heat exchanger 732, and returns to the compressor 75. When the defrosting operation of the upper heat exchanger 731 is performed for a predetermined time or when the refrigerant-on-sensor 811a at the outlet of the upper heat exchanger 731 reaches a predetermined temperature, defrosting of the lower heat exchanger 732 is performed next.

In order to switch to the defrosting of the lower heat exchanger 732, the main circuit opening / closing valve 713a is opened, the main circuit opening / closing valve 713b is closed, the bypass opening / closing valve 715a is closed, 715b are opened so that the lower heat exchanger 732 in the outdoor heat exchanger 73 functions as a condenser and the upper heat exchanger 731 functions as an evaporator to form a defrosting and heating operation cycle for simultaneously performing defrost and heating do. At this time, the outdoor air blowing motor 633 is operated at low speed and the indoor air blowing motor 313 controls the operation so that the blowing out temperature can be maintained at a predetermined temperature or more.

Here, the flow of the refrigerant from the four-way valve 72 to the indoor heat exchanger 33 until the pressure in the decompression device 74 is reduced is the same as when the upper heat exchanger 731 is defrosted. The refrigerant decompressed in the decompression device 74 flows in the direction indicated by the broken line arrow in FIG. 7 and enters the upper heat exchanger 731 through the main circuit opening / closing valve 713a to be an evaporator, is heat-exchanged with outdoor air, And is returned to the compressor (75).

The refrigerant entering the hot gas bypass pipe 715 flows in the direction indicated by the solid line arrows in FIG. 7 and enters the lower heat exchanger 732 of the outdoor heat exchanger 73 through the bypass opening / closing valve 715b. Since the refrigerant entering the lower heat exchanger 732 is high in temperature and high pressure, the frost adhered to the lower heat exchanger 732 is melted downward. The lowered molten water is discharged to the outside of the outdoor unit (6) from the discharge port of the defrost water. The refrigerant defrosting the frost of the lower heat exchanger 732 flows out of the lower heat exchanger 732, merges with the refrigerant vaporized in the upper heat exchanger 731, and is returned to the compressor 75. When the defrosting operation of the lower heat exchanger 732 has elapsed for a predetermined time or the refrigerant on sensor 811b at the outlet of the lower heat exchanger 732 has risen to a predetermined temperature, the main circuit opening / closing valves 713a and 713b are opened And the bypass opening / closing valves 715a and 715b are closed to terminate the defrosting / heating operation, and immediately return to the heating operation of FIG.

As described above, when the air heat source heat pump air conditioner is operated in the heating mode, if the humidity of the outdoor air is high, the outdoor heat exchanger 73 is conceived. The amount of outdoor air circulating through the outdoor heat exchanger 73 is reduced because the ventilation path of the outdoor heat exchanger 73 is narrowed. When the amount of circulated outdoor air is reduced, the amount of heat exchange is reduced, so that the evaporation temperature of the refrigerant flowing in the outdoor heat exchanger 73 is lowered to compensate for the heat exchange amount. When the evaporation temperature of the refrigerant is lowered, the surface temperature of the outdoor heat exchanger 73 on the outdoor side is also lowered, so that the impregnation is more likely to occur and the impregnation proceeds.

In this state, since the amount of heat drawn from the outdoor air by the outdoor heat exchanger 73 is reduced, the amount of heat radiated from the indoor heat exchanger 33 is also reduced, and the heating capacity is reduced, thereby impairing the comfort of the room. In order to prevent this, defrosting is performed when the amount of frosting of the outdoor heat exchanger (73) exceeds a predetermined amount to melt the frost of the outdoor heat exchanger (73). At this time, since the lower portion of the outdoor heat exchanger 73 passes the molten water flowing from the upper portion, water droplets are more likely to remain than the upper portion. When the defrosting operation is terminated and the heating operation is started in the state where water droplets remain, the remaining water droplets freeze and obstruct ventilation of outdoor air. If the ventilation of the outdoor air is obstructed, the concretion is liable to grow as described above, and the heating ability is lowered.

The hot gas bypass circuit includes bypass open / close valves 715a and 715b for connecting the discharge side of the compressor 75 and the inlet side of the outdoor heat exchanger 73 at the time of heating. In the air heat source heat pump air conditioner in which the bypass open / close valve (715a or 715b) is opened by defrosting the exchanger (73), the outdoor heat exchanger (73) is divided into a plurality of refrigerant circuits, The main circuit opening and closing mechanisms 713a and 713b are provided between the indoor heat exchanger 33 and the plurality of refrigerant circuits and the main circuit opening and closing mechanisms 713a and 713b and the main circuit opening / Closing valves 715a and 715b are alternately opened and closed to defrost one circuit of the plurality of refrigerant circuits while heating operation is continued in another circuit.

Thereby, the heating operation can be continued by using the lower heat exchanger 732 or the upper heat exchanger which is not removed as the evaporator. Further, the area of the heat exchanger which must be thawed by the hot gas from the compressor 75 at the time of defrosting becomes narrow when defrosting the lower heat exchanger 732. This narrow range of implantation can be warmed up, shortening the time required for defrosting.

Further, since a narrow range is required to be warmed, heat is easily spread to all corners, and the sea water is sufficiently dissolved, and the temperature of the water droplets to be melted increases, viscosity tends to decrease, and a part of the water tends to evaporate into the air. In this way, the amount of water droplets remaining without being flowed into the lower heat exchanger 732 is reduced. Therefore, the lower heat exchanger 732 has a small number of remaining remnants at the time of defrosting and is in a state in which it is difficult to conceive, so that the progress of conception is delayed. When the conceptional progress is delayed, the start of defrosting of the outdoor heat exchanger (73) can be delayed so much that the indoor can be sufficiently heated by the defrosting / heating operation.

Thus, the defrosting and heating operation for defrosting the room can be performed, the time required for the defrosting and heating operation can be shortened, and the comfort in the room can be kept long.

Since the outside air temperature is low at the time of heating under the temperature condition in which the impregnation generally occurs, a high condensation temperature is required to raise the temperature of the warm air, and the suction pressure of the compressor 75 is low, , The efficiency of the compressor (75) is lowered. In order to compensate for this, it is necessary to increase the number of revolutions when securing the circulation amount of the refrigerant when using the rotation speed control compressor. Further, since the amount of one of the compressors 75 is added to the heating capacity, the compressor 75 is sufficiently operated to secure the heating capacity. As a result, the compressor 75 is driven at a high load, and the compressor 75 is maintained at a high temperature. When the defrosting / heating operation is started from this state, the compressor 75 is maintained at a high temperature, so that the refrigerant discharged from the compressor 75 flows through the hot gas bypass circuit at a high temperature and flows into the upper heat exchanger 731.

In general, the outdoor fan 631 blowing air to the outdoor heat exchanger 73 uses an axial flow fan 631 to circulate the outdoor air in a large quantity to efficiently perform heat exchange. Since the wind pressure that can be generated by the axial flow fan is not so large, the structure of the outdoor unit 6 is such that the outdoor air inlet, the outdoor heat exchanger 73, the axial flow fan 631 and the outdoor air outlet are arranged substantially straight, Thereby suppressing the pressure loss of ventilation.

As described above, since a large amount of outside air is ventilated with a slight wind pressure, the amount of outside air passing through the outdoor heat exchanger 73 varies depending on the location due to the difference in ventilation path. When the outdoor heat exchanger 73 is divided into upper and lower portions, it is judged that the lower portion of the outdoor heat exchanger 73 is more affected by the ground than the upper portion, and the ventilation resistance is slightly increased. The amount of outside air flowing under the outdoor heat exchanger 73 is slightly reduced by this slight difference.

Therefore, when comparing the upper portion and the lower portion of the outdoor heat exchanger 73, the lower heat exchanger 732 is delayed in the air speed compared with the upper heat exchanger 731, and the heat exchange performance is lowered. As a result, the lower heat exchanger 732 becomes lower in temperature than the upper heat exchanger 731, and is easily conceived. Further, since the lower portion of the outdoor heat exchanger 73 passes the molten water at the time of defrosting the upper heat exchanger 731 flowing from the upper portion, water droplets are more likely to remain than the upper portion. When the defrosting / heating operation is terminated with the water droplet remaining, and the heating operation is started, the remaining water droplets freeze and interfere with the ventilation of the outdoor air. If the ventilation of the outdoor air is disturbed, the conception becomes easier to grow as described above.

Thus, when defrosting the outdoor heat exchanger 73, the defrosting operation is performed in the order of the upper heat exchanger 731 and the lower heat exchanger 732 in that order, and the defrosting time of the lower heat exchanger 732 is changed to the upper heat exchanger Is longer than the defrosting time of the fuel tank (731). Thereby, the outdoor heat exchanger 73 is frozen, and the defrosting / heating operation is sequentially performed from the upper heat exchanger 731 when the impregnation amount reaches a predetermined amount requiring defrosting. First, the defrosting / heating operation is performed by flowing gas from the hot gas bypass circuit to the refrigerant circuit on the upper side. The frost attached to the air side heat transfer surface of the refrigerant circuit on the upper side of the outdoor heat exchanger 73 is melted and flows downward because the hot gas flows to the refrigerant circuit on the upper side.

In the case where the temperature of the molten water is high, the molten water comes into contact with the air-side heat transfer surface of the lower heat exchanger 732 and is melted by the sensible heat of the molten water itself to further flow down. At this time, the portion of the lower-side heat exchanger 732 where the frost is melted is excluded from the frost which interfered with the heat transfer. Therefore, the heat transfer from the outside air to the refrigerant is smoothly performed and the heat exchange ability is restored, . When the temperature of the melted water flowing down to the melting point is lowered, the melted water is cooled down without being melted and is cooled with the refrigerant of the lower refrigerant circuit flowing in the lower heat exchanger and solidified.

At this time, since the solidification heat of the melted water warms the refrigerant in the lower refrigerant circuit, the amount of heat used for melting the molten iron in the upper heat exchanger is recovered. When the defrosting / heating operation for defrosting the upper heat exchanger 731 is completed, defrosting / heating operation for defrosting the lower heat exchanger 732 is started. Since the hot gas from the compressor 75 flows to the refrigerant circuit on the lower side, the frost adhering to the air side heat transfer surface of the refrigerant circuit under the outdoor heat exchanger 73 is melted and flows downward to the lower heat exchanger 73 Is defrosted.

At this time, since the upper heat exchanger 731 is just after the defrosting is completed, the frost which interfered with the heat transfer is removed, the heat transfer from the outside air to the refrigerant is smoothly performed, the heat exchange ability is restored, . As described above, even when defrosting / heating operation is performed, the heating can be continued while suppressing a drastic decrease in the heating ability.

In addition, when defrosting the upper heat exchanger 731, the amount of fusing of the lower heat exchanger 732 temporarily increases. However, since the defrosting / heating operation for defrosting the lower heat exchanger 732 is performed following the defrosting of the upper heat exchanger 731, the lower heat exchanger 732 also defrosts. Therefore, the conception of the lower heat exchanger 732 continues to increase, and no residual frost is generated. As a result, the implantation can be completely removed, and no residual frost is generated.

In addition, since the hot gas of high temperature can be used for defrosting the upper heat exchanger 731 in the initial defrosting / heating operation, the defrosting / heating operation time is short, but a wide range of defrosting can be performed. At this time, since the temperature of the refrigerant conveyed to the indoor heat exchanger (33) is also high, the heating capacity is reduced. However, since the time is short, fluctuation of the room temperature is small and deterioration of the indoor comfort can be suppressed.

As described above, the defrosting of the upper heat exchanger 731 over a wide range from the start of the defrosting / heating operation to the defrosting of the lower heat exchanger 732 is completed in a short time. In the defrosting / heating operation for defrosting the lower heat exchanger 732, the range of the lower heat exchanger 732 to be defrosted is narrower than that of the upper heat exchanger 731, but the temperature of the discharge gas of the compressor 75 And the defrosting / heating operation of the upper heat exchanger 731 is lowered. Therefore, the time required for the defrosting / heating operation becomes longer.

Further, since the lower heat exchanger 732 is likely to adhere to the frost, it is necessary to make the time for the defrosting / heating operation sufficiently long so as to prevent the frost from occurring. At this time, however, since the defrosting of the upper heat exchanger 731 is completed, the upper heat exchanger 731 can fully exhibit its heat exchange ability, absorbing heat from the outside air and reducing the discharge temperature of the compressor 75 And the defrosting and heating operation can be performed by suppressing the temperature drop of the hot gas. Thus, the time required for the defrosting / heating operation is suppressed to about twice the time required for defrosting the upper heat exchanger, and the sum of the time required for defrosting / heating operation of the upper heat exchanger 731 and the lower heat exchanger 732 It can be shortened as compared with the case of the reverse cycle defrost operation. At this time, since the lowering of the discharge temperature of the compressor 75 is suppressed, the lowering of the heating capacity can also be suppressed. Therefore, defrosting can be performed while heating the room, and the time required for defrosting / heating operation can be shortened.

In general, in order to perform efficient heating operation, the discharge temperature of the compressor 75 at the time of heating operation is controlled to be about 70 캜. In the compressor 75 having the high-pressure chamber, since the discharged refrigerant is filled in the high-pressure chamber, the entire compressor 75 is maintained at a high temperature. The discharge temperature of the compressor 75 at the completion of the defrosting operation is required to be equal to or higher than the room temperature in order to improve the rise in the heating operation after the defrosting of the outdoor heat exchanger 73 is completed. Considering the temperature drop to the exchanger 33, it is preferable that the temperature is 25 占 폚 or higher.

In this embodiment, the defrosting period is shortened, the amount of frosting adhering to the outdoor heat exchanger 73 is limited, and the defrosting is terminated at the amount of heat accumulated in the compressor 75, so that the time required for defrosting can be shortened , It is possible to speed up the recovery of the heating capacity after returning to the heating.

The indoor heat exchanger 33 is provided with a compressor 75 having an outer shell made of steel, a four-way valve 72, an indoor heat exchanger 33, a decompression device 74 and an outdoor heat exchanger 73 having an aluminum- The defrosting prohibition period is set to be equal to or smaller than the value of the following formula (1).

[Formula 1]

Maximum defrosting prohibition period (minutes) = 8 × mass of compressor (kg) ÷ heat absorbed by outdoor heat exchanger (㎾)

Thereby, heat of 70 deg. C to 25 deg. C accumulated in the high-temperature compressor can be used for defrosting the outdoor heat exchanger 73 to prevent heat from being taken from the room. For example, in an air conditioner having a heating capacity of 6.7 kW, the mass of the compressor 75 is about 12 kg. Therefore, the available axial heat quantity Q is approximately 12 (mass) x 0.435 (specific heat is assumed to be all steel for estimation) x (70 - 25) = 235 kJ.

However, at this time, since the temperature of the outdoor heat exchanger 73 is about -5 캜, it is necessary to add the amount of heat required for the conception and the outdoor heat exchanger 73 to rise to 0 캜. Since there is no problem with the amount of heat of one heat of the amount of the heat of the condensed heat (Q), the amount of heat that can be used for the fusing of the impure is 235 - 24 = 211 kJ.

On the other hand, in the case that the air volume of the outdoor air blowing device 63 of the air conditioner of this class is about 12.5 m 3 / min and the outdoor air temperature is about 5 ° C / 4 ° C (DB / WB) ) Is considered to be 4.0 kW. The average temperature of the outdoor heat exchanger 73 at that time is about -4 ° C, the sensible heat ratio is 0.65, and the implantation amount is 1.9 kg / h. The amount of heat required to melt this frost is 634 kJ. Thus, when the defrosting prohibition period is set to (235 - 24) / 634 = 0.33 hours = 20 minutes or less, defrosting of the outdoor heat exchanger 73 is enabled only by heat storage of the compressor 75.

Here, the condition for measuring the heating capacity of the air heat source heat pump air conditioner is set to 7 ° C / 6 ° C (DB / WB) under the ISO standard, so that the air conditioner is designed not to enter the defrosting operation under these conditions, The temperature of the outdoor heat exchanger 73 rises and almost no conception occurs. On the other hand, when the outside air temperature is lower than 5 占 폚, the absolute humidity of the outside air is lowered, and the amount of conception is reduced. For this reason, in the calculation example, the outside air temperature around 5 ° C where the implantation amount is the greatest is taken as an example.

Although the blowing amount of the outdoor air blowing device 63 is set to about 12.5 m3 / min, the slope of the saturated water vapor line near this temperature, even when the air volume changes and the temperature of the outdoor heat exchanger 73 changes, The sensible heat ratio after the change is 0.65. Therefore, the implantation amount does not change and becomes 1.9 kg / h. That is, if the amount of heat absorption is constant (if the heating ability is constant), the heating amount of the impregnation amount becomes constant in the heating operation near this temperature.

Thus, when the mass of the compressor 75 and the heating capacity are judged, the approximate heating operation time until the impregnation amount capable of defrosting is obtained by only the amount of heat of the compressor 75, As the defrosting prohibition period. Further, the outdoor heat exchanger (73) is divided into a plurality of refrigerant circuits up and down, and at least one refrigerant circuit divided at the time of defrosting / heating operation is operated as an evaporator. Thus, even when defrosting / heating operation is performed, the heat absorption amount from a part of the outdoor heat exchanger 73 acting as an evaporator and the electric input of the compressor 75 can contribute to the heating of the room, The deterioration of the ability can be suppressed and the temperature drop in the room can be suppressed. Thus, it is possible to prevent the feeling of comfort in the room from disappearing.

The defrosting period is set to 20 minutes to 5 minutes. As a result, the amount of impregnation of the outdoor heat exchanger 73 is limited in almost all of the heating capacity classes, and the amount of defrost heat during the defrosting / heating operation can be raised only by the heat storage of the compressor 75. Thus, it is possible to prevent the feeling of comfort in the room from disappearing.

Further, the discharge temperature of the compressor (75) is shifted to the high temperature side in accordance with the decrease of the outside air temperature, and the defrosting prohibition period is shortened. As a result, the amount of heat of the compressor (75) increases, the defrosting / heating operation time is shortened, and the recovery of the discharge temperature of the compressor (75) at the time of return to the heating operation becomes faster, . Therefore, the change in the room temperature during the defrosting and heating operation is suppressed even at the low outside temperature.

When the defrosting / heating operation is performed, the number of rotations of the outdoor fan 631 is lower than that during the heating operation, and when the outdoor air temperature is lower than the predetermined value, the operation of the outdoor blower is stopped during the defrosting operation. By thus reducing the number of rotations of the outdoor fan 631 during the defrosting and heating operation, the amount of heat taken from the forced convection by the outdoor fan 631 to the outside air from the fused water, the fins, and the pipe during defrosting and heating operation is reduced The melting of the frost is proceeding efficiently. Further, when the temperature of the outside air becomes lower and the amount of heat radiation to the outside air is increased, the operation of the outdoor fan 631 is stopped. Thus, most of the heat absorbed from the forced convection by the outdoor fan 631 to the outside air is effectively used to melt the frost, and the defrosting of the outdoor heat exchanger 73 proceeds efficiently. Therefore, defrosting / heating operation time can be shortened and residual frost does not occur in defrosting / heating operation even when the temperature is low.

Further, when the temperature of the outdoor heat exchanger 73 does not reach the predetermined value even if the defrosting operation is performed until the defrosting operation time is reached, the four-way valve 72 is switched to perform the reverse cycle defrosting operation. Thereby, the residual refrigerant reverse defrosting operation near the refrigerant circuit outlet (the outdoor heat exchanger inlet at the time of cooling) of the outdoor heat exchanger 73, which was not completely melted in the hot gas bypass defrosting in the heating cycle, Can be melted with the high-temperature refrigerant from the heat exchanger (75).

As described above, even when the installation conditions and worsening of the gas phase conditions cause a residual frost in the normal defrosting / heating operation, a complete defrosting operation free from residual frost can be performed. This makes it possible to widen the range of the installation condition and the weather condition in which indoor heating can be performed.

Next, driving characteristics of heating according to the present embodiment will be described with reference to Fig. Fig. 8 is a characteristic diagram showing changes in room temperature at the time of driving operation of the air conditioner of Fig. 1; Fig. Here, a cold morning was assumed, and both the room temperature and the outside air temperature were started from the state of -5 占 폚.

As shown in the characteristic in Fig. 8, the defrosting operation time is shortened to about 2 minutes by the heating operation and the defrosting / heating operation according to the present embodiment, and a part of the outdoor heat exchanger is also operated as the evaporator So that the indoor temperature is also reduced to about 3 DEG C, the comfort is secured, and heating is continued. In addition, the arrival time of the room temperature to 20 캜 is as short as 80 minutes.

1 is a configuration diagram of an air conditioner according to an embodiment of the present invention;

Fig. 2 is a diagram illustrating a refrigeration cycle of the air conditioner of Fig. 1. Fig.

Fig. 3 is a moisture air line showing a change in outdoor air at the time of defrosting. Fig.

Fig. 4 is a refrigerating cycle chart showing the flow of refrigerant during the cooling operation of the air conditioner of Fig. 1; Fig.

Fig. 5 is a refrigerating cycle chart showing the flow of refrigerant during the heating operation of the air conditioner of Fig. 1; Fig.

Fig. 6 is a refrigerating cycle chart showing the flow of refrigerant when defrosting the upper portion of the outdoor heat exchanger of the air conditioner of Fig. 1; Fig.

Fig. 7 is a refrigerating cycle chart showing the flow of refrigerant when defrosting the lower portion of the outdoor heat exchanger of the air conditioner of Fig. 1; Fig.

Fig. 8 is a characteristic diagram showing changes in room temperature during driving operation of the air conditioner of Fig. 1; Fig.

Description of the Related Art

1: Air conditioner

2: indoor unit

5: Remote control

6: outdoor unit

8: Connection piping

10: Control device

33: Indoor heat exchanger

72: Four way valve

73: outdoor heat exchanger

74: Pressure reducing device

75: Compressor

76: Accumulator

311: Indoor fan

313: Indoor air blowing motor

631: Outdoor fans

633: Outdoor air blowing motor

710: Suction piping

711: Discharge piping

712: Usage gas pipe

713: liquid pipe

714: Heat source side gas pipe

715: Hot gas bypass pipe

713a: Upper main circuit opening / closing valve

713b: Lower main circuit opening / closing valve

713d: Hot Pipe

715a: Upper bypass open / close valve

715b: Lower bypass open / close valve

716a: Upper bypass pipe

716b: Lower bypass pipe

731: Upper heat exchanger

731a: first upper side refrigerant circuit

731b: second upper refrigerant circuit

731c: third upper side refrigerant circuit

732: Lower heat exchanger

732a: first lower side refrigerant circuit

732b: second lower side refrigerant circuit

811a, 811b, 812: a refrigerant-on-

Claims (7)

  1. A refrigeration cycle is formed by connecting a compressor, a four-way valve, an indoor heat exchanger, a decompression device, and an outdoor heat exchanger with a refrigerant pipe,
    The outdoor heat exchanger is divided into two and connected in parallel and a main circuit opening and closing mechanism is provided on the inlet side of the refrigerant circuit of each of the two outdoor heat exchangers divided in the heating operation,
    A hot gas bypass circuit for connecting the discharge side of the compressor and the inlet side in the heating operation of the refrigerant circuit of each of the two outdoor heat exchangers divided into the two units is provided and the hot gas bypass circuit is provided with a bypass open /
    An air conditioner having a control device for controlling operation,
    Wherein the outdoor heat exchanger is divided into two upper and lower refrigerant circuits and constitutes a lower heat exchanger and an upper heat exchanger larger than the lower heat exchanger,
    The control device reverses and opens the main circuit opening / closing mechanism and the bypass opening / closing valve when starting defrosting during the heating operation, and performs the defrosting / heating operation for heating the lower heat exchanger while defrosting the upper heat exchanger The defrosting and heating operation in which the upper heat exchanger is defrosted while defrosting the lower heat exchanger, and returning to the heating operation after termination of the defrosting / heating operation.
  2. The control apparatus according to any one of claims 1 to 3, wherein the controller is configured to perform a defrosting / heating operation for defrosting the lower heat exchanger and heating the upper heat exchanger while defrosting the upper heat exchanger while defrosting the lower heat exchanger And the time is lengthened.
  3. The air conditioner according to claim 1, wherein the defrosting period when the outside air temperature is 0 占 폚 or higher is made to be equal to or smaller than the following formula (1) using a compressor having a steel shell.
    [Formula 1]
    Defrosting period (unit: minute) = 8 × mass of compressor (unit: kg) / heat absorbed by outdoor heat exchanger (unit: ㎾)
  4. The air conditioner according to claim 3, wherein the defrosting prohibition period is 20 minutes to 5 minutes.
  5. The air conditioner according to claim 1, wherein the control device shifts the discharge temperature of the compressor to the high temperature side on the basis of the decrease in the outside air temperature and controls the defrosting prohibition period to be shortened.
  6. 2. The outdoor unit according to claim 1, wherein the controller controls the number of rotations of the outdoor air blowing device to be lower than that during the heating operation during the defrosting / heating operation, So as to stop the operation of the air conditioner.
  7. 2. The outdoor heat exchanger according to claim 1, wherein when the temperature of the outdoor heat exchanger does not reach a predetermined value even if the defrosting / heating operation is performed until the defrosting operation time is reached, the control device switches the four- So as to perform the control.
KR1020070079848A 2006-09-07 2007-08-09 Air conditioner KR100846266B1 (en)

Priority Applications (2)

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JP2006242740A JP4272224B2 (en) 2006-09-07 2006-09-07 Air conditioner
JPJP-P-2006-00242740 2006-09-07

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CN (1) CN100510583C (en)

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JP2008064381A (en) 2008-03-21

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