KR20100116891A - Defrosting driving method of air conditioner - Google Patents

Abstract

PURPOSE: A defrosting method of an air conditioner is provided to effectively perform a defrosting operation and a heating operation according to the load of an air conditioner and the capacities of a plurality of refrigerant units. CONSTITUTION: A plurality of refrigerant units perform heating operation(S1). The difference between the temperatures of the outdoor heat exchangers of the refrigerant units and the outdoor temperature is measured(S2). It is determined whether any one of the measured temperatures reached a defrosting preparing temperature(S3). The maximum capacity of a first compressor of a first refrigerant unit having a defrosting preparing temperature is compared with the load of the air conditioner(S4). If the load of the air conditioner is larger than the maximum capacity of the first compressor, the first compressor operates at maximum capacity frost the first refrigerant unit(S).

Description

Defrosting driving method of air conditioner

The present invention relates to a defrosting operation method of an air conditioner, and more particularly, to an air conditioner that performs defrosting while continuously supplying heat to a heat supply source according to a load of an air conditioner and a load of a compressor.

In general, an air conditioner is a device for cooling or heating by supplying heat to a heat supply using a refrigeration cycle including a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger.

In the method of supplying heat to the heat source, an indoor heat exchanger may be installed at the heat source to provide cooling or heating by heat exchange with indoor air. In the indoor heat exchanger, the refrigerant may be heat-exchanged with a separate heat medium, and a heat exchange unit may be provided at a heat supply unit to supply heat. In addition, the indoor heat exchanger may exchange heat with the refrigerant and supply hot water to the heat supply source.

The air conditioner as described above generates water on the surface of the heat exchanger that acts as an evaporator during operation, and water is generated on the surface of the indoor heat exchanger in the case of the cooling operation and on the surface of the outdoor heat exchanger in the case of the heating operation. In this case, if condensate generated on the surface of the outdoor heat exchanger freezes during the heating operation, the heating performance is impaired by preventing the smooth flow and heat exchange of the outdoor air.

Therefore, if the heating operation is stopped during heating operation and the refrigeration cycle is operated in reverse cycle (ie cooling operation) in order to remove the condensed water, the high temperature and high pressure refrigerant passes through the outdoor heat exchanger, and freezing of the surface of the outdoor heat exchanger. Is melted by the heat of the refrigerant. However, when the defrosting operation is performed in the reverse cycle as described above, there is a problem that the heating of the room must be stopped.

An object of the present invention is to provide a defrosting operation method of the air conditioner that can continuously supply heat to the heat supply while the refrigerant cycle unit is provided with a plurality of refrigerant cycle unit, the defrosting operation.

Another object of the present invention is to provide a defrosting operation method of the air conditioner that can efficiently perform the defrosting operation and heating operation according to the load of the air conditioner.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the defrosting operation method of the air conditioner according to an embodiment of the present invention is a heating operation step of performing a heating operation of the plurality of refrigerant cycle unit, the outdoor heat exchanger temperature and the outdoor temperature of the plurality of refrigerant cycle unit The first temperature measuring step of measuring the temperature difference (A temperature) of the defrost preparation step of determining which one of the A temperature measured in the first temperature measuring step reaches the defrost preparation temperature and the A temperature in the defrost preparation step And a load determining step of comparing the load of the air conditioner with the maximum capacity of the first compressor of the first refrigerant cycle unit having reached the defrost preparation temperature.

And a heating operation step in which the first refrigerant cycle unit performs a heating operation among the plurality of refrigerant cycle units, a first temperature measurement step of measuring a temperature difference (A temperature) between an outdoor heat exchanger temperature and an outdoor temperature of the first refrigerant cycle unit, The defrost preparation step of determining whether the temperature difference measured in the first temperature measuring step reaches the defrost preparation temperature, and when the temperature difference reaches the defrost preparation temperature in the defrost preparation step, assists to operate the stopped refrigerant cycle unit to the minimum capacity Heating operation step.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the defrosting operation method of the air conditioner of the present invention, there are one or more of the following effects.

First, there is an advantage that can continue to supply heat to the heat supply while the defrost operation of some refrigerant cycle unit.

Second, the defrosting operation and the heating operation can be effectively performed according to the load of the air conditioner and the capacity of the plurality of refrigerant cycle units.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to the drawings for explaining a defrosting operation method of an air conditioner according to embodiments of the present invention.

1 is a diagram showing the overall configuration of an air conditioner of a first embodiment of the present invention.

Referring to FIG. 1, the air conditioner according to the embodiment includes a first refrigerant cycle unit 10 and a second refrigerant cycle unit 20.

Each refrigerant cycle unit 10, 20 includes compressors 16, 26, first heat exchangers 14, 24, expansion mechanisms 12, 22, and second heat exchangers 18, 28. Accordingly, the refrigerant absorbs or releases heat while compressing, condensing, expanding, and evaporating while flowing the above components.

The refrigerant flowing through the first heat exchanger (14, 24) exchanges heat with outdoor air, and the refrigerant flowing through the second heat exchanger (18, 28) causes heat exchange with the thermal medium flowing through the heat medium pipe (30), which will be described later. do. In addition, the heat medium that has heat-exchanged with the refrigerant in the second heat exchangers 18 and 28 transfers heat to the heat supply source.

When the refrigerant cycles 10 and 20 operate in a cooling cycle, the refrigerant compressed by the compressors 16 and 26 is condensed by heat exchange with outdoor air in the first heat exchangers 14 and 24. The refrigerant is expanded in the expansion mechanisms 12 and 22 and then evaporated while exchanging heat with the heat medium in the second heat exchangers 18 and 28. At this time, the heat medium is cooled and supplied to a heat supply source for cooling. The refrigerant evaporated in the second heat exchangers 18 and 28 is introduced into the compressors 14 and 24 and compressed to form a cooling cycle.

When the refrigerant cycles 10 and 20 operate in a heating cycle, the refrigerant compressed in the compressors 16 and 26 is condensed by heat exchange with the heat medium in the second heat exchangers 18 and 28. Then, the heat medium rises in temperature and is supplied to a heat supply source for heating. The refrigerant is expanded in the expansion mechanisms 12 and 22 and then evaporated while exchanging heat with outdoor air in the first heat exchangers 14 and 24. In addition, the compressor is introduced into the compressors 16 and 26 and compressed to form a heating cycle.

On the other hand, the air conditioner of the present embodiment further includes a heat medium pipe 30 through which the heat medium flows. The heat medium pipe 30 includes a heat medium supply pipe 31, heat exchange pipes 32 and 33, and a heat medium recovery pipe 34.

The heat medium supply pipe 31 flows through the heat medium after supplying heat to the heat supply destination.

The heat exchange pipes 32 and 33 are connected in parallel with the heat medium supply pipe 31. That is, a part of the heat medium flowing through the heat medium supply pipe 31 flows into the heat exchange pipe 32 which exchanges heat with the second heat exchanger 18 of the first refrigerant cycle unit 10. And the remaining heat medium flows to the heat exchange pipe 33 for heat exchange with the second heat exchanger 28 of the second refrigerant cycle unit 20.

The heat medium that has heat-exchanged with the refrigerant while flowing through the heat exchange pipes 32 and 33 is supplied to the heat supply source through the heat medium recovery pipe 34.

On the other hand, the heat supply source can supply cooling, heating, hot water or cold water while heat-exchanging the heat medium and another heat medium flowing through the heat medium recovery pipe 34 using a separate heat exchanger. And if the heat medium is water, hot water may be supplied to the hot water supply source.

Referring to the operation and defrosting operation method of the first embodiment of the air conditioner of the present invention configured as described above are as follows.

2 and 3 are flowcharts showing a defrosting operation method of the air conditioner of this embodiment. A defrosting operation method of the air conditioner of the present embodiment will be described with reference to FIG.

In the heating operation step S1, the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20 are operated in a heating cycle. The heat medium absorbs heat from the refrigerant flowing through the second heat exchangers 18 and 28 while flowing through the heat exchange passages 32 and 33. The heat supplier receives heat through the heat medium.

The first temperature measuring step S2 measures the temperature difference (hereinafter, A temperature) between the outdoor heat exchanger temperature and the outdoor temperature of the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20. In the defrost preparation step (S3), it is determined whether any one of the A temperatures measured in the temperature measurement step (S2) corresponds to the defrost preparation temperature.

In the heating operation, the refrigerant of the first heat exchangers 14 and 24 is evaporated by the outdoor air. Therefore, when the outdoor temperature is low, frosting may occur in the first heat exchangers 14 and 24. On the other hand, the temperature of the first heat exchanger (14, 24) is gradually lowered in the process of implantation. Therefore, A temperature gradually increases during the process of implantation. As a result, the defrost preparation step (S3) determines whether the A temperature of each of the refrigerant cycle units 10 and 20 during the heating operation reaches a predetermined defrost preparation temperature. On the other hand, the defrost preparation temperature is set to a value smaller than the defrosting operation temperature to determine the defrosting operation described later.

The load determination step S4 compares the maximum capacity of the compressors 16 and 26 of the refrigerant cycle units 10 and 20 when the A temperature reaches the defrost preparation temperature in the defrost preparation step S3 and the load of the air conditioner. . Although each A temperature of the first refrigerant cycle unit 10 or the second refrigerant cycle unit 20 may reach the defrost preparation temperature, in this embodiment, the A temperature of the first refrigerant cycle unit 10 is prepared for defrosting. The explanation is based on reaching the temperature.

Here, the load of the air conditioner is a capacity according to the heat demand required by the heat supply source, and the capacity of the compressors 16 and 26 is a load produced by each refrigerant cycle unit 10 or 20 corresponding to the load of the air conditioner. The maximum capacity of the compressor (16,26) is the maximum amount of load that each refrigerant cycle unit (10,20) can produce corresponding to the load of the air conditioner.

On the other hand, the maximum capacities of the compressors 16 and 26 in this embodiment may be formed with the same capacities, and may be formed with different capacities.

Hereinafter, each defrosting operation method according to the load of the air conditioner of the present embodiment and the capacity of the compressors 16 and 26 will be described. For convenience, the maximum capacity of the first compressor 16 of the first cooling cycle unit 10 is compared with the load of the air conditioner.

If the load of the air conditioner is greater than the maximum capacity of the first compressor 16 in the load determination step (S4), the implantation induction step (S5) is performed.

On the other hand, when the load of the air conditioner is larger than the maximum capacity of any one of the compressors 16 and 26, one refrigerant cycle unit 10 is operated at the maximum capacity, and the other refrigerant cycle unit 20 is air-conditioned. It may be operated in response to the remaining load of the machine. In addition, by distributing the load of the air conditioner, the two refrigerant cycle units 10 and 20 may be operated.

In the present embodiment, in the heating operation step S1, the total load of the air conditioner is distributed and operated by the two refrigerant cycle units 10 and 20.

In addition, when the implantation induction step S5 is performed, the first compressor 16 is operated at the maximum capacity to induce the implantation of the first refrigerant cycle unit 10. That is, the first compressor 16 is operated at the maximum capacity, and the capacity of the second compressor 26 is reduced by the increased capacity of the first compressor 16. As a result, the first refrigerant cycle unit 10 is operated at the maximum capacity, and the second refrigerant cycle unit 20 is loaded with a positive load minus the load shared by the first refrigerant cycle unit 10 from the total load of the air conditioner. Is driven.

Meanwhile, in the present embodiment, two outdoor heat exchanger units 10 and 20 are provided, but when three or more outdoor heat exchanger units are provided, the remaining outdoor heat exchanger units except for the outdoor heat exchanger unit operated at maximum capacity are air. The load can be distributed by distributing the load by subtracting the load shared by the outdoor heat exchanger unit operating at the maximum capacity from the total load of the conditioner.

As a result, the amount of refrigerant evaporated in the first heat exchanger 14 of the first refrigerant cycle unit 10 may be increased while operating the refrigerant cycle units 10 and 20 corresponding to the total load of the air conditioner. . Therefore, the amount of refrigerant evaporated in the first heat exchanger 14 of the first refrigerant cycle unit 10 is increased. As the amount of refrigerant evaporated increases, the temperature of the first heat exchanger 14 of the first refrigerant cycle unit 10 drops. As a result, the A temperature of the first refrigerant cycle unit 10 reaching the defrost preparation temperature is gradually increased.

The defrosting operation determining step S6 determines whether the A temperature of the first refrigerant cycle unit 10 operated at the maximum capacity reaches the defrosting operation temperature. The defrosting operation temperature is set to a value larger than the defrosting preparation temperature.

In the defrosting operation S7, when the A temperature of the first refrigerant cycle unit 10 reaches the defrosting operation temperature, the first refrigerant cycle unit 10 performs the defrosting operation, and the second refrigerant cycle unit 20 The second compressor 26 operates at the maximum capacity.

That is, the first refrigerant cycle unit 10 starts the operation of removing the idea of the first heat exchanger 14 while operating in a cooling cycle. The second refrigerant cycle unit 20 bears the load of the maximum capacity that the second refrigerant cycle unit 20 can bear while operating the second compressor 26 at the maximum capacity. Therefore, in the present exemplary embodiment, the second refrigerant cycle unit 20 may be operated at the maximum capacity even during the defrosting operation of the first refrigerant cycle unit 10, thereby providing heating required by the heat supply source. Although not shown, in the defrosting operation step S7 of the present embodiment, when the first heat exchanger 14 is defrosted and it is determined that the defrost is completed, the step of sequentially defrosting the first heat exchanger of the remaining refrigerant cycle unit is repeated. do.

On the other hand, when three or more refrigerant cycle units are provided, any one refrigerant cycle unit performs defrosting operation, and refrigerant cycle units that do not perform defrosting operation distribute loads corresponding to the total load of the air conditioner. Can be driven.

On the other hand, when it is determined that the capacity of the first compressor 16 is greater than the total load of the air conditioner in the load determination step S4, only the first refrigerant cycle unit 10 may be operated to correspond to the total load. . In addition, the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20 may be operated by dispersing the total load.

In this embodiment, the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20 are operated by dispersing the total load. When it is determined that the capacity of the first compressor 16 is greater than the total load of the air conditioner in the load determination step S4, the load concentration operation step S8 is performed.

In the load concentration operation step S8, the heating operation according to the total load of the air conditioner is performed by the first compressor 16, and the second compressor 26 of the second refrigerant cycle unit 20 stops the operation. That is, the entire air conditioner load shared by the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20 is operated by only the first refrigerant cycle unit 10. Therefore, as described above, the amount of refrigerant evaporated in the first heat exchanger 14 of the first refrigerant cycle unit 10 increases while operating in response to the entire air conditioner load.

On the other hand, in the load concentration operation step (S8), unlike in the induction induction step (S5), the first compressor 16 is not operated at the maximum capacity. Therefore, the A temperature of the first refrigerant cycle unit 10 reaching the defrost preparation temperature may drop below the defrost preparation temperature according to the change of the outdoor temperature or the load of the air conditioner, or may reach the defrost operation temperature. . Therefore, after the load intensive operation step S8 is performed, the second temperature measurement step S9 of measuring the temperature A is performed again.

In addition, a defrosting operation determining step S10 of determining whether the A temperature measured in the second temperature measuring step S9 reaches the defrost preparation temperature is performed. When the A temperature reaches the defrosting operation temperature, the first refrigerant cycle unit performs the defrosting operation, and a defrosting operation step S11 of performing a heating operation according to the entire load of the air conditioner with the remaining refrigerant cycle units is performed. .

In the defrosting operation step S11 of the present embodiment, the first refrigerant cycle unit 10 performs the defrosting operation while operating in a cooling cycle, and in the auxiliary heating operation step S23, the first refrigerant cycle unit 10 is burdened. The total load of the air conditioner is burdened by the second refrigerant cycle unit 20 during the heating operation with the minimum capacity. However, as described above, when three or more refrigerant cycle units are provided, the entire air conditioner load may be distributed and operated in the remaining refrigerant cycle units except for the first refrigerant cycle unit 10. Although not shown, in the defrosting operation step S11 of the present embodiment, when the first heat exchanger 14 is defrosted and the defrost is determined to be completed, the steps of sequentially defrosting the first heat exchanger of the remaining refrigerant cycle unit are repeated. do.

When it is determined in the defrosting operation determining step S10 that the temperature A does not correspond to the defrosting operation temperature, the heating operation determining step S12 is performed.

The heating operation determining step S12 determines whether the temperature A measured in the second temperature measuring step S9 falls below the defrost preparation temperature. When the A temperature of the first refrigerant cycle unit falls below the defrost preparation temperature, a heating operation step S13 is performed in which the heating operation according to the entire load of the air conditioner is performed by the compressor of the entire refrigerant cycle unit.

On the other hand, in the heating operation step (S13) in the present embodiment, the entire air conditioner load is dispersed in the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20. However, when three or more refrigerant cycle units are provided, the entire air conditioner load may be distributed and operated in each refrigerant cycle unit.

Meanwhile, unlike the above description, the heating operation determining step S13 may be performed before the defrosting operation determining step S11. The cycle of the flowchart described above is repeatedly performed while the heating operation step S13 is performed.

Hereinafter, a defrosting operation method of an air conditioner according to a second embodiment of the present invention will be described.

The overall configuration and operation of this embodiment are the same as in the first embodiment. Hereinafter, the difference from the first embodiment will be described.

In the load concentration operation step S8 of the first embodiment, the first compressor 16 performs heating operation according to the total load of the air conditioner, and the second compressor 26 of the second refrigerant cycle unit 20 is operated. Abort. However, in this embodiment, the second refrigerant cycle unit 20 is operated at the minimum capacity that does not affect the total load. Meanwhile, when three or more refrigerant cycle units are provided, the remaining refrigerant cycle units except for the first refrigerant cycle unit 10 may be operated with the minimum capacity.

In addition, in the present embodiment, the first refrigerant cycle unit 10 may be operated at a capacity other than the capacity of the refrigerant cycle unit which operates at the minimum capacity at the load of the air conditioner.

As a result, in this embodiment, the defrosting operation of the first refrigerant cycle unit 10 may be performed while maintaining the existing load required by the heat supply source. Further, while the remaining refrigerant cycle units are operated at the minimum capacity, the amount of load change of the second refrigerant cycle unit 20 generated in the defrosting operation step S11 may be reduced. Therefore, during the defrosting operation S11, the second refrigerant cycle unit 20 may reduce the time for operating the air conditioner full load.

4 is a flowchart illustrating a defrosting operation method of an air conditioner according to a third embodiment of the present invention. A defrosting operation method of the air conditioner of the third embodiment of the present invention will be described with reference to FIG.

The overall configuration of this embodiment is the same as that of the first embodiment, and a description thereof will be omitted.

Unlike the first embodiment, a case in which some of the plurality of refrigerant cycle units operate in the present embodiment, and the first refrigerant cycle unit among the two refrigerant cycle units is operated for convenience of description below.

In the heating operation step S20, the first refrigerant cycle unit 10 among the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20 operates in response to the load of the air conditioner. In this case, the operation is performed when the total load of the air conditioner is less than the load of the first compressor 16.

In this case, in the first embodiment, the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20 operate by sharing the load of the air conditioner, but in the present embodiment, the first refrigerant cycle unit 10 ) Operate according to the total load of the air conditioner.

In the temperature measuring step S21, the A temperature of the first refrigerant cycle unit 10 in operation is measured.

In the defrost preparation step S22, it is determined whether the temperature A measured in the temperature measurement step S21 reaches the defrost preparation temperature. When the A temperature corresponds to the defrost preparation temperature, the auxiliary heating operation step (S23) is performed.

Auxiliary heating operation step (S23) is to operate a plurality of refrigerant cycle unit at a minimum capacity. In this embodiment, the second refrigerant cycle unit 20 is operated with the minimum capacity. On the other hand, in the present embodiment it can be controlled so that the capacity of the first refrigerant cycle unit 10 is reduced by the minimum capacity of the second refrigerant cycle unit 20. In addition, the minimum capacity operated by the second refrigerant cycle unit 20 may be set to a capacity that does not affect the overall load of the air conditioner. Meanwhile, when three or more refrigerant cycle units are provided, the entire refrigerant cycle unit except for the first refrigerant cycle unit 10 may be operated with the minimum capacity.

In the auxiliary heating operation step S23, the first compressor 16 is not operated at the maximum capacity. Therefore, the A temperature of the first refrigerant cycle unit 10 reaching the defrost preparation temperature may drop below the defrost preparation temperature according to the change of the outdoor temperature or the load of the air conditioner, or may reach the defrost operation temperature. . Therefore, after the load concentration operation step S8 is performed, the second temperature measurement step S24 of measuring the temperature A is performed again.

The defrosting operation determining step S25 is performed to determine whether the A temperature measured in the second temperature measuring step S24 reaches the defrost preparation temperature. And when the A temperature reaches the defrost operation temperature, the first refrigerant cycle unit performs the defrost operation, the defrost operation step (S26) to perform the heating operation according to the entire load of the air conditioner to the remaining refrigerant cycle unit do.

In the defrosting operation step (S26) of the present embodiment, the first refrigerant cycle unit 10 performs the defrosting operation while operating in a cooling cycle, and in the auxiliary heating operation step (S23), the first refrigerant cycle unit 10 was burdened. The total load of the air conditioner is burdened by the second refrigerant cycle unit 20 during the heating operation with the minimum capacity. As described above, when three or more refrigerant cycle units are provided, the entire air conditioner load may be distributed and operated in the remaining refrigerant cycle units except for the first refrigerant cycle unit 10. Although not shown, in the defrosting operation step S26 of the present embodiment, when the first heat exchanger 14 is defrosted and the defrost is determined to be completed, the steps of sequentially defrosting the first heat exchanger of the remaining refrigerant cycle unit are repeated. do.

When it is determined in the defrosting operation determining step S25 that the temperature A does not correspond to the defrosting operation temperature, the heating operation determining step S27 is performed.

The heating operation determining step S12 determines whether the temperature A measured in the second temperature measuring step S24 falls below the defrost preparation temperature. When the temperature A of the first refrigerant cycle unit falls below the defrost preparation temperature, a heating operation step S28 is performed in which the heating operation according to the entire load of the air conditioner is performed by the compressor of the entire refrigerant cycle unit.

On the other hand, in the heating operation step (S28) in the present embodiment, the entire air conditioner load is dispersed in the first refrigerant cycle unit 10 and the second refrigerant cycle unit 20. However, when three or more refrigerant cycle units are provided, the entire air conditioner load may be distributed and operated in each refrigerant cycle unit.

Meanwhile, unlike the above description, the heating operation determining step S27 may be performed before the defrosting operation determining step S25. In addition, as the heating operation step S28 is performed, the cycle of the flowchart described above is repeatedly performed.

As a result, in this embodiment, the defrosting operation of the first refrigerant cycle unit 10 may be performed while maintaining the existing load required by the heat supply source. In addition, the amount of load change of the second refrigerant cycle unit 20 generated during the defrosting operation step S26 may be reduced while operating the stationary refrigerant cycle units with the minimum capacity. Therefore, during the defrosting operation S26, the time for the second refrigerant cycle unit 20 to operate the air conditioner full load may be reduced.

Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows the overall configuration of an air conditioner of a first embodiment of the present invention;

2 is a flowchart showing a part of the defrosting operation method of the air conditioner of the first embodiment of the present invention;

3 is a flowchart showing the rest of the defrosting operation method of the air conditioner of the first embodiment of the present invention;

4 is a flowchart showing a defrosting operation method of the air conditioner of the third embodiment of the present invention.

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

10: first refrigerant cycle unit 12: expansion mechanism

14: first heat exchanger 16: compressor

18: second heat exchanger 20: second refrigerant cycle unit

22: expansion mechanism 24: first heat exchanger

26 compressor 28 second heat exchanger

30: heat medium piping 31: heat medium supply piping

32, 33: heat exchange pipe 34: heat medium recovery pipe

Claims (15)

A heating operation step in which the plurality of refrigerant cycle units perform a heating operation; A first temperature measuring step of measuring a temperature difference (A temperature) between an outdoor heat exchanger temperature and an outdoor temperature of the plurality of refrigerant cycle units; A defrost preparation step of determining which one of the A temperatures measured in the first temperature measurement step reaches a defrost preparation temperature; And A load determination step of comparing a load of an air conditioner with a maximum capacity of the first compressor of the first refrigerant cycle unit in which the A temperature reaches a defrost preparation temperature in the defrost preparation step; Defrosting operation method of the air conditioner comprising a. The method according to claim 1, In the load determination step, if the load of the air conditioner is greater than the maximum capacity of the first compressor, by operating the first compressor at the maximum capacity to further induce the idea of induction of the first refrigerant cycle unit air further comprising an air induction step Method of defrosting the conditioner. The method according to claim 2, The implantation induction step, A defrosting operation method of an air conditioner for performing a heating operation according to the remaining load of the air conditioner to the second compressor of the second refrigerant cycle unit in which the A temperature measured in the temperature measurement step does not reach the defrost preparation temperature. The method according to claim 3, A defrosting operation determining step of determining whether the A temperature of the first refrigerant cycle unit reaches the defrosting operation temperature; And A defrosting operation step of performing the defrosting operation of the first refrigerant cycle unit and operating the second compressor of the second refrigerant cycle unit at the maximum capacity when the temperature A reaches the defrosting operation temperature in the defrosting operation determining step; Defrosting operation method of the air conditioner comprising a. The method according to claim 2, The implantation induction step, A defrosting operation method of an air conditioner which performs heating operation according to the remaining load of an air conditioner with compressors of refrigerant cycle units whose A temperature measured in the temperature measuring step does not reach the defrost preparation temperature. The method according to claim 5, A defrosting operation determining step of determining whether the A temperature of the first refrigerant cycle unit reaches a defrosting operation temperature; And When the temperature A reaches the defrosting operation temperature in the defrosting operation determining step, the first refrigerant cycle unit performs the defrosting operation, and performs the heating operation according to the total load of the air conditioner with the compressors of the remaining refrigerant cycle units. Defrosting operation step; Defrosting operation method of the air conditioner comprising a. The method according to claim 1, In the load determination step, if the capacity of the first compressor is greater than the total load of the air conditioner, the first compressor performs the heating operation according to the total load of the air conditioner, and the remaining refrigerant cycle unit stops the operation. The defrosting operation method of the air conditioner further comprising a load concentration operation step. The method according to claim 7, A second temperature measuring step of measuring A temperature of the first refrigerant cycle unit after the load intensive operation step; A defrosting operation determining step of determining whether the A temperature measured in the second temperature measuring step reaches the defrosting operation temperature; And A defrosting operation step when the A temperature reaches a defrosting operation temperature in the defrosting operation determining step, the first refrigerant cycle unit performs a defrosting operation and performs a heating operation according to the entire load of the air conditioner to the remaining refrigerant cycle units; Defrosting operation method of the air conditioner comprising a. The method according to claim 7, A second temperature measuring step of measuring A temperature of the first refrigerant cycle unit after the load intensive operation step; A heating operation determining step of determining whether the A temperature measured in the second temperature measuring step falls below a defrost preparation temperature; And A heating operation step of performing heating operation according to the total load of the air conditioner by the compressor of the entire refrigerant cycle unit when the temperature A of the first refrigerant cycle unit falls below the defrost preparation temperature; Defrosting operation method of the air conditioner further comprising. The method according to claim 1, In the load determination step, if the capacity of the first compressor is greater than the total load of the air conditioner, the heating operation is performed according to the total load of the air conditioner with the first compressor, and the remaining refrigerant cycle unit is operated at the minimum capacity. The defrosting operation method of the air conditioner further comprising a load concentration operation step. The method according to claim 10, A second temperature measuring step of measuring A temperature of the first refrigerant cycle unit after the auxiliary heating operation step; A defrosting operation determining step of determining whether the A temperature measured in the second temperature measuring step reaches the defrosting operation temperature; And A defrosting operation step when the A temperature reaches a defrosting operation temperature in the defrosting operation determining step, the first refrigerant cycle unit performs a defrosting operation and performs a heating operation according to the entire load of the air conditioner to the remaining refrigerant cycle units; Defrosting operation method of the air conditioner comprising a. The method according to claim 10, A second temperature measuring step of measuring the A temperature of the first refrigerant cycle unit after the auxiliary heating operation step; A heating operation determining step of determining whether the A temperature measured in the second temperature measuring step falls below a defrost preparation temperature; And A heating operation step of performing heating operation according to the total load of the air conditioner by the compressor of the entire refrigerant cycle unit when the temperature A of the first refrigerant cycle unit falls below the defrost preparation temperature; Defrosting operation method of the air conditioner further comprising. A heating operation step of performing heating operation by the first refrigerant cycle unit among the plurality of refrigerant cycle units; A first temperature measuring step of measuring a temperature difference (A temperature) between an outdoor heat exchanger temperature and an outdoor temperature of the first refrigerant cycle unit; A defrost preparation step of determining whether the temperature difference measured in the first temperature measuring step reaches a defrost preparation temperature; And When the temperature difference reaches the defrost preparation temperature in the defrost preparation step, an auxiliary heating operation step of operating the refrigerant cycle unit at a minimum capacity; Defrosting operation method of the air conditioner comprising a. The method according to claim 13, A second temperature measuring step of measuring A temperature of the first refrigerant cycle unit after the auxiliary heating operation step; A defrosting operation determining step of determining whether the A temperature measured in the second temperature measuring step reaches the defrosting operation temperature; And A defrosting operation step when the A temperature reaches a defrosting operation temperature in the defrosting operation determining step, the first refrigerant cycle unit performs a defrosting operation and performs a heating operation according to the entire load of the air conditioner to the remaining refrigerant cycle units; Defrosting operation method of the air conditioner comprising a. The method according to claim 13, A second temperature measuring step of measuring the A temperature of the first refrigerant cycle unit after the auxiliary heating operation step; A heating operation determining step of determining whether the A temperature measured in the second temperature measuring step falls below a defrost preparation temperature; And When the temperature A of the first refrigerant cycle unit falls below the defrost preparation temperature, the refrigerant cycle unit operating at the minimum capacity is stopped, and the heating is performed by the first refrigerant cycle unit according to the load of the air conditioner. Driving step; Defrosting operation method of the air conditioner further comprising.

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