EP1610076A2 - Kälteanlage und Verfahren zum Betrieb derselben - Google Patents

Kälteanlage und Verfahren zum Betrieb derselben Download PDF

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Publication number
EP1610076A2
EP1610076A2 EP05013389A EP05013389A EP1610076A2 EP 1610076 A2 EP1610076 A2 EP 1610076A2 EP 05013389 A EP05013389 A EP 05013389A EP 05013389 A EP05013389 A EP 05013389A EP 1610076 A2 EP1610076 A2 EP 1610076A2
Authority
EP
European Patent Office
Prior art keywords
pipe
refrigerant
outdoor
temperature
heat exchanger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05013389A
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English (en)
French (fr)
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EP1610076A3 (de
Inventor
Hidemichi Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP1610076A2 publication Critical patent/EP1610076A2/de
Publication of EP1610076A3 publication Critical patent/EP1610076A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air

Definitions

  • the present general inventive concept relates to a cooling cycle apparatus and a method of operating the same.
  • An air conditioner capable of performing cooling and heating operations which is representative of a cooling cycle apparatus having a cooling cycle constituted by an outdoor heat exchanger, an indoor heat exchanger, and a compressor, which are connected to each other through pipes, is well known.
  • Flow direction of refrigerant in the air conditioner is changed by a four-way valve to allow the air conditioner to be operated in a cooling operation mode or a heating operation mode.
  • the outdoor heat exchanger serves as a condenser
  • the indoor heat exchanger as an evaporator
  • the outdoor heat exchanger serves as the evaporator
  • the indoor heat exchanger as the condenser.
  • drain water defrosting water generated from the outdoor heat exchanger, serving as the evaporator
  • drain water may be frozen at the lower part of the outdoor heat exchanger depending upon the temperature of outdoor air. Occurrence of such a freezing phenomenon is effectively prevented by the provision of a cooling cycle apparatus characterized in that a portion of the refrigerant pipe connected between an indoor expansion valve and an outdoor expansion valve, which serves as a hot line pipe, is arranged at the lower part of the outdoor heat exchanger, and high-temperature and high-pressure refrigerant passes through the hot line pipe (Japanese Unexamined Patent Publication No. H09-138008).
  • the opening level of the indoor expansion valve and the outdoor expansion valve is controlled to maintain the temperature of the hot line pipe at a predetermined range. Consequently, the refrigerant flowing through the hot line pipe is maintained in a two-phase state, i.e., in a gas-and-liquid state, and therefore, frost or ice formation at the lower part of the outdoor heat exchanger as well as the lot line pipe is effectively prevented.
  • the refrigerant may remain in the outdoor heat exchanger(s) not used when the heating operation is performed.
  • the heating operation is continuously performed while the circulating amount of the refrigerant necessary to form the cooling cycle is insufficient, and therefore, reliability of the cooling cycle apparatus is deteriorated.
  • the present general inventive concept provides a cooling cycle apparatus that is capable of preventing frost or ice formation at the lower part of an outdoor heat exchanger without damage to a hot line operation and maintaining the pressure of refrigerant in the cooling cycle at a predetermined range, thereby improving heating and cooling capacities at the indoor unit side.
  • the present general inventive concept also provides a method of operating such a cooling cycle apparatus.
  • a cooling cycle apparatus including an indoor heat exchanger, an indoor expansion part, an outdoor expansion part, an outdoor heat exchanger and a compressor, which are successively connected to each other via a pipe through which refrigerant circulates to constitute a cooling cycle, wherein the pipe includes a refrigerant pipe connected between the indoor expansion part and the outdoor expansion part, the refrigerant pipe being branched into a first pipe, which extends through at least a part of the outdoor heat exchanger, and a second pipe, which does not extend through the outdoor heat exchanger.
  • the whole circulating amount of the refrigerant can be divided through the first pipe and the second pipe at a predetermined ratio. Consequently, when the heating operation is performed with the outdoor heat exchanger used as an evaporator, high-temperature and high-pressure refrigerant passes through the lower part of the outdoor heat exchanger, and the refrigerant flowing to the outdoor expansion part from the indoor expansion part is maintained at high temperature and high pressure, and therefore, frost or ice formation at the lower part of the outdoor heat exchanger is prevented.
  • the cooling cycle apparatus may further include: a first temperature detection part to detect the temperature of the first pipe; a second temperature detection part to detect the temperature of outdoor air; and a flow rate control unit disposed on the first pipe to control flow rate of the refrigerant based on the temperature of the first pipe and the temperature of the outdoor air.
  • the flow rate control unit can be opened or closed based on the temperature of the first pipe and the temperature of the outdoor air. Consequently, the refrigerant can be allowed or prohibited to flow through the first pipe as required, and therefore, the temperature at the lower part of the outdoor heat exchanger can be changed by controlling flow rate of the refrigerant flowing through the first pipe.
  • the cooling cycle apparatus may further include: a guide mechanism to guide at least some of the refrigerant to the first pipe, when the refrigerant flows to the outdoor heat exchanger from the outdoor expansion part, based on the temperature of the first pipe and the temperature of the outdoor air.
  • the cooling cycle apparatus when the heating operation is performed with the entire area of the outdoor heat exchanger used as an evaporator, some of the refrigerant flowing through the first pipe can be guided in the same direction as the refrigerant passing through the outdoor heat exchanger by controlling an opening/closing valve and the guide mechanism based on the temperature of the first pipe and the temperature of the outdoor air. Consequently, frost or ice formation at the lower part of the outdoor heat exchanger is prevented. Furthermore, the first pipe can be used as the evaporator, and therefore, the capacity of the outdoor heat exchanger is increased.
  • the outdoor heat exchanger has a heat exchange part, which allows a larger amount of refrigerant to pass therethrough than through the first pipe
  • the cooling cycle apparatus may further include: a pipe selection mechanism disposed at at least one side of the first pipe and the heat exchange part to guide the refrigerant, in one direction, to the outdoor heat exchanger from the outlet side of the compressor.
  • a method of a operating cooling cycle apparatus including an indoor expansion part, an outdoor expansion part, an outdoor heat exchanger and a compressor, which are successively connected to each other via a pipe through which refrigerant circulates to constitute a cooling cycle, the pipe including a refrigerant pipe connected between the indoor expansion part and the outdoor expansion part and branched into a first pipe, which extends through at least a part of the outdoor heat exchanger, and a second pipe, which does not extend through the outdoor heat exchanger, wherein the method includes: detecting the temperature of outdoor air; detecting the temperature of the first pipe; and controlling flow rate of the refrigerant flowing through the first pipe based on the temperature of the outdoor air and the temperature of the first pipe.
  • the high-temperature and high-pressure refrigerant is allowed to flow through the first pipe based on the temperature of the outdoor air and the temperature of the first pipe when the heating operation is performed. Consequently, the temperature at the lower part of the outdoor heat exchanger can be increased while the refrigerant flowing to the outdoor expansion part is maintained at high temperature and high pressure, and therefore, frost or ice formation at the lower part of the outdoor heat exchanger is prevented. Furthermore, the refrigerant can be prohibited to flow through the first pipe when it is not necessary for the refrigerant to pass through the lower part of the outdoor heat exchanger, and flow rate of the refrigerant flowing through the first pipe can be controlled as required.
  • the operation method may further include: guiding the refrigerant flowing through the first pipe in the same direction as the refrigerant passing through the outdoor heat exchanger.
  • the refrigerant flowing through the first pipe can be guided in the same direction as the refrigerant passing through the outdoor heat exchanger based on the temperature of the first pipe and the temperature of the outdoor air. Consequently, the first pipe can be used as the evaporator, and therefore, the capacity of the outdoor heat exchanger is increased.
  • a cooling cycle apparatus including an indoor heat exchanger, an indoor expansion part, an outdoor expansion part, an outdoor heat exchanger and a compressor, which are successively connected to each other via a pipe through which refrigerant circulates to constitute a cooling cycle, wherein the method includes: detecting the temperature of outdoor air; and guiding the refrigerant, in one direction, to the outdoor heat exchanger from the outlet side of the compressor through a first pipe, which extends through at least a part of the outdoor heat exchanger, and/or a heat exchange part disposed in the outdoor heat exchanger to allow a larger amount of refrigerant to pass therethrough than through the first pipe based on the detected temperature of the outdoor air.
  • the refrigerant can be guided in one direction through the first pipe and the heat exchange part by a pipe selection mechanism when the refrigerant flows to the outdoor heat exchanger from the compressor.
  • the refrigerant may be guided in one direction through either the first pipe or the heat exchange part.
  • the amount of the refrigerant passing through the outdoor heat exchanger can be controlled based on the temperature of the outdoor air. Consequently, flow rate of the refrigerant heat-exchanged in the outdoor heat exchanger is minimized when the refrigerant discharged from the compressor flows only through the first pipe, and therefore, the refrigerant can be maintained at high temperature and high pressure even when the temperature of the outdoor air is low.
  • the method may further include: detecting discharge pressure of the compressor, and the operation of guiding the refrigerant in one direction is performed based the detected discharge pressure of the compressor.
  • FIG. 1 is a circuit diagram showing an air conditioner according to an embodiment of the present general inventive concept
  • FIG. 2 is a circuit diagram showing an air conditioner according to second and third embodiments of the present invention.
  • FIG. 3 is a flow chart illustrating a method of operating the air conditioner according to FIG. 2 when a heating operation is performed, according to another embodiment of the present general inventive concept;
  • FIG. 4 is a flow chart illustrating a method of operating the air conditioner according to FIG. 2 when a heating operation is performed, according to another embodiment of the present general inventive concept;
  • FIG. 5 is a circuit diagram showing an air conditioner according to another embodiment of the present general inventive concept.
  • FIG. 6 is a flow chart illustrating a method of operating the air conditioner according to FIG. 5 when a heating operation is performed, according to another embodiment of the present general inventive concept;
  • FIG. 7 is a flow chart illustrating a method of operating the air conditioner according to FIG. 5 when a heating operation is performed, according to another embodiment of the present general inventive concept
  • FIG. 8 is a circuit diagram showing an air conditioner according to another embodiment of the present general inventive concept.
  • FIG. 9 is a flow chart illustrating a method of operating the air conditioner according to FIG. 8 when a cooling operation is performed;
  • FIG. 10 is a circuit diagram showing an air conditioner according to another embodiment of the present general inventive concept.
  • FIG. 11 is a flow chart illustrating a method of operating the air conditioner according to FIG. 10 when a cooling operation is performed;
  • FIG. 12 is a circuit diagram showing an air conditioner according to another embodiment of the present general inventive concept.
  • FIG. 13 is a flow chart illustrating a method of operating the air conditioner according to FIG. 12 when a cooling operation is performed.
  • the air conditioner (cooling cycle apparatus) 1 comprises an indoor unit 2 and an outdoor unit 3.
  • indoor unit 2 In the indoor unit 2 are disposed an indoor heat exchanger 5 and an indoor expansion valve (indoor expansion part) 6.
  • In the outdoor unit 3 are disposed an outdoor expansion valve (outdoor expansion part) 7, an outdoor heat exchanger 8, an accumulator 10, a four-way valve 11, and a compressor 12. All the parts are connected to each other through pipes to provide a cooling cycle for refrigerant circulation.
  • a refrigerant pipe 13 is connected between the indoor expansion valve 6 and the outdoor expansion valve 7.
  • the refrigerant pipe 13 branches into: a hot line pipe (a first pipe) 13A extending through the lower part of the outdoor heat exchanger 8 between a first diverging point 13a adjacent to the indoor expansion valve 6 and a second diverging point 13b adjacent to the outdoor expansion valve 7; and a bypass pipe (a second pipe) 13B connected between the first diverging point 13a and the second diverging point 13b without extending through the lower part of the outdoor heat exchanger 8.
  • the refrigerant pipe 13 is designed such that the whole circulating amount of the refrigerant can be divided through the hot line pipe 13A and the bypass pipe 13B at a predetermined ratio.
  • the outdoor heat exchanger 8 has two refrigerant channels disposed therein. Also, the outdoor heat exchanger 8 has the hot line pipe 13A and a heat exchange part 8A, which allows a larger amount of refrigerant to pass therethrough than through the hot line pipe 13A.
  • High-temperature and high-pressure refrigerant discharged from the compressor 12 flows into the indoor heat exchanger 5 of the indoor unit 2 from the outdoor unit 3 via the four-way valve 11, and is then expanded by the indoor expansion valve 6. As a result, the refrigerant is decompressed.
  • the decompressed refrigerant flows through the refrigerant pipe 13 in the outdoor unit 3.
  • the refrigerant flows through the hot line pipe 13A and the bypass pipe 13B at the first diverging point 13a at a predetermined ratio.
  • the refrigerant flowing through the hot line pipe 13A passes through the lower part of the outdoor heat exchanger 8.
  • the refrigerant flowing through the hot line pipe 13A joins the refrigerant flowing through the bypass pipe 13B at the second diverging point 13b. Also, the refrigerant bypassing the hot line pipe 13A flows through the bypass pipe 13B. The refrigerant flows into the heat exchange part 8A of the outdoor heat exchanger 8, which serves as the evaporator, via the outdoor expansion valve 7 such that heat exchange between outdoor air and the heat exchange part is performed.
  • the refrigerant flowing to the outdoor expansion valve 7 from the indoor expansion valve 6, temperature and pressure of which are unchanged flows through the hot line pipe 13A as well as the bypass pipe 13B.
  • frost or ice formation at the lower part of the outdoor heat exchanger 8 is prevented by the refrigerant flowing through the hot line pipe 13A.
  • the air conditioner 20 according to this embodiment is different from the air conditioner 1 according to the embodiment of FIG. 1 in that the air conditioner 20 further includes: a hot line pipe temperature detecting device (a first temperature detection part) 21 to detect the temperature of the inlet part of the hot line pipe 13A, through which the refrigerant is introduced into the lower part of the outdoor heat exchanger 8 when the heating operation is performed; an outdoor air temperature detecting device (a second temperature detection part) 22 to detect the temperature of outdoor air; and a hot line circuit electromagnetic valve (flow rate control unit) 23 to control flow rate of the refrigerant based on the temperature detected by the hot line pipe temperature detecting device 21 and the temperature detected by the outdoor air temperature detecting device 22.
  • a hot line pipe temperature detecting device a first temperature detection part
  • an outdoor air temperature detecting device a second temperature detection part 22 to detect the temperature of outdoor air
  • a hot line circuit electromagnetic valve (flow rate control unit) 23 to control flow rate of the refrigerant based on the temperature detected by the hot line pipe temperature detecting device 21 and
  • the hot line circuit electromagnetic valve 23 is disposed at the inlet part of the hot line pipe 13A, through which the refrigerant is introduced into the outdoor heat exchanger 8 when the heating operation is performed, such that the hot line circuit electromagnetic valve 23 is opened/closed by a flow rate control device 25.
  • the method of operating the air conditioner 20 includes: detecting the temperature of outdoor air with the outdoor air temperature detecting device 22 (operation S01); detecting the temperature of the hot line pipe 13A with the hot line pipe temperature detecting device 21 (operation S02); and controlling flow rate of the refrigerant flowing through the hot line pipe 13A by opening/closing the hot line circuit electromagnetic valve 23 based on the temperature of the outdoor air and the temperature of the hot line pipe 13A (operation S03).
  • the hot line circuit electromagnetic valve 23 is closed.
  • the refrigerant flows to the outdoor expansion valve 7 from the indoor expansion valve 6 through the bypass pipe 13B.
  • the hot line circuit electromagnetic valve 23 is opened.
  • the temperature TA of the outdoor air is detected by the outdoor air temperature detecting device 22.
  • the temperature Tr of the hot line pipe 13A is detected by the hot line pipe temperature detecting device 21.
  • the refrigerant flowing through the refrigerant pipe 13 is introduced into the hot line pipe 13A.
  • the refrigerant passes through the outdoor heat exchanger 8, and therefore, the lower part of the heat exchanger 8 is heated by the refrigerant.
  • the refrigerant flowing through the hot line pipe 13A joins the refrigerant flowing through the bypass pipe 13B, and then flows to the outdoor expansion valve 7.
  • Tr ⁇ TA the hot line circuit electromagnetic valve 23 is opened. At this time, the refrigerant flows through the hot line pipe 13A, but the temperature of outdoor air is higher than the temperature of the hot line pipe 13A. Consequently, heat radiation to the outdoor air does not occur.
  • the hot line circuit electromagnetic valve 23 can be opened/closed based on the relation between the temperature of the hot line pipe 13A and the temperature of the outdoor air such that the refrigerant flows through the hot line pipe 13A as required.
  • the flow rate of the refrigerant flowing through the hot line pipe 13A can be controlled depending upon the temperature condition when the heating operation is performed, and therefore, excessive heat radiation from the lower part of the outdoor heat exchanger 8 is effectively prevented without damage to the hot line function. Consequently, heating efficiency of the indoor unit is improved.
  • the air conditioner according to the present embodiment of FIGS. 2 and 4 is different from the air conditioner according to the previous embodiment of FIGS. 2 and 4 in that the air conditioner according to the embodiment of FIGS. 3 and 4 further includes a flow rate control valve, which can be substituted for the hot line circuit electromagnetic valve 23.
  • the opening level of the flow rate control valve is changed by the flow rate control device 25.
  • the method of operating the air conditioner 20 includes: detecting the temperature of outdoor air with the outdoor air temperature detecting device 22 (operation S11); detecting the temperature of the hot line pipe 13A with the hot line pipe temperature detecting device 21 (operation S12); and controlling flow rate of the refrigerant flowing through the hot line pipe 13A by controlling the opening level of the flow rate control valve based on the temperature of the outdoor air and the temperature of the hot line pipe 13A (operation S13).
  • the flow rate control valve is closed.
  • the refrigerant flows to the outdoor expansion valve 7 from the indoor expansion valve 6 through the bypass pipe 13B.
  • the flow rate control valve is fully opened.
  • the temperature TA of the outdoor air is detected by the outdoor air temperature detecting device 22.
  • the temperature Tr of the hot line pipe 13A is detected by the hot line pipe temperature detecting device 21.
  • the refrigerant flowing through the refrigerant pipe 13 is introduced into the hot line pipe 13A.
  • the refrigerant passes through the lower part of the outdoor heat exchanger 8, and therefore, the lower part of the heat exchanger 8 is heated by the refrigerant.
  • the refrigerant flowing through the hot line pipe 13A joins the refrigerant flowing through the bypass pipe 13B, and then flows to the outdoor expansion valve 7.
  • Tr > TA the opening level of the flow rate control valve is decreased to a predetermined level by the flow rate control device 25.
  • Tr TA
  • Tr ⁇ TA the opening level of the flow rate control valve is increased to the predetermined level.
  • the refrigerant flows through the hot line pipe 13A, but the temperature of outdoor air is equal to or higher than the temperature of the hot line pipe 13A. Consequently, heat radiation to the outdoor air does not occur. In this way, the above-mentioned process is repeated to perform the heating operation.
  • the opening level of the flow rate control valve can be controlled to accurately control the flow rate of the refrigerant flowing through the hot line pipe 13A. Consequently, the hot line function is more efficiently utilized.
  • the air conditioner 40 according to the present embodiment of FIGS. 5 and 6 is different from the air conditioner according to the embodiment of FIGS. 2 and 3 in that the air conditioner 40 further includes: a guide mechanism 41 to guide at least some of the refrigerant to the hot line pipe 13A, when the refrigerant flows to the outdoor heat exchanger 8 from the outdoor expansion valve 7, based on the temperature of the hot line pipe 13A and the temperature of the outdoor air.
  • the guide mechanism 41 includes: a first bypass pipe 42 connected between the heat exchange part 8A and the hot line pipe 13A at the outlet part of the outdoor heat exchanger 8; a second bypass pipe 43 connected between the heat exchange part 8A and the hot line pipe 13A at the inlet part of the outdoor heat exchanger 8; a first non-return valve 45 disposed between a connection 44A at which the first bypass pipe 42 and the hot line pipe 13A are connected to each other and a connection 44B (the second diverging point 13b) at which the hot line pipe 13A and the bypass pipe 13B are connected to each other; and a second non-retum valve 46 disposed on the first bypass pipe 42; and an evaporator side electromagnetic valve 47 disposed on the second bypass pipe 43.
  • the first bypass pipe 42 is connected between the hot line pipe 13A and the heat exchange part 8A at the outdoor expansion valve side. Also, the first bypass pipe 42 is connected to the heat exchange part 8A at a connection 44C.
  • the second bypass pipe 43 is connected between the hot line pipe 13A and the heat exchange part 8A at the compressor side. Also, the second bypass pipe 43 is connected to the hot line pipe 13A at a connection 44D, and is connected to the heat exchange part 8A at a connection 44E.
  • the first non-return valve 45 serves to allow the refrigerant to flow to the connection 44B from the connection 44A
  • the second non-return valve 46 serves to allow the refrigerant discharged from the outdoor expansion valve 7 to flow to the hot line pipe 13A right before introduction to the outdoor heat exchanger 8.
  • the evaporator side electromagnetic valve 47 is opened/closed by the flow rate control device 25.
  • the method of operating the air conditioner 40 includes: detecting the temperature of outdoor air with the outdoor air temperature detecting device 22 (operation S21); detecting the temperature of the hot line pipe 13A with the hot line pipe temperature detecting device 21 (operation S22); guiding the refrigerant flowing through the hot line pipe 13A in the same direction as the refrigerant passing through the outdoor heat exchanger 8 (operation S23); and controlling flow rate of the refrigerant flowing through the hot line pipe 13A by opening/closing the hot line circuit electromagnetic valve 23 based on the temperature of the outdoor air and the temperature of the hot line pipe 13A (operation S24).
  • the heating operation is performed such that the hot line circuit electromagnetic valve 23 is opened, and the evaporator side electromagnetic valve 47 is closed.
  • the temperature TA of the outdoor air is detected by the outdoor air temperature detecting device 22.
  • the temperature Tr of the hot line pipe 13A is detected by the hot line pipe temperature detecting device 21.
  • frost or ice may be formed at the lower part of the outdoor heat exchanger 8. Consequently, the operation of controlling flow rate of the refrigerant flowing through the hot line pipe 13A (operation S24) is performed such that only the hot line circuit electromagnetic valve 23 is opened by the flow rate control device 25.
  • the hot line pipe 13A serves as an evaporator.
  • the refrigerant flows through the hot line pipe 13A when the heating operation is performed, and therefore, frost or ice formation at the lower part of the outdoor heat exchanger 8 is effectively prevented.
  • excessive heat radiation to the outdoor air is effectively prevented by opening/closing the hot line circuit electromagnetic valve 23, and therefore, heating efficiency of the air conditioner is improved.
  • the evaporator side electromagnetic valve 47 is also opened/closed, when the frost or ice formation does not occur at the lower part of the outdoor heat exchanger 8, such that the refrigerant flows through the hot line pipe 13A in the same direction as the refrigerant passing through the outdoor heat exchanger 8 by the first non-return valve 45 and the second non-retum valve 46.
  • the hot line pipe 13A serves as the same evaporator as the outdoor heat exchanger 8, and therefore, the capacity of the outdoor heat exchanger is increased.
  • the air conditioner according to the embodiment of FIGS. 5 and 7 is different from the air conditioner according to the embodiment of FIGS. 5 and 6 in that the air conditioner according to FIGS. 5 and 7 further includes a flow rate control valve, which is a substitute of the hot line circuit electromagnetic valve 23, as in the embodiment of FIGS. 2 and 4.
  • the method of operating the air conditioner includes: detecting the temperature of outdoor air with the outdoor air temperature detecting device 22 (operation S31); detecting the temperature of the hot line pipe 13A with the hot line pipe temperature detecting device 21 (operation S32); guiding the refrigerant flowing through the hot line pipe 13A in the same direction as the refrigerant passing through the outdoor heat exchanger 8 (operation S33); and controlling flow rate of the refrigerant flowing through the hot line pipe 13A by controlling the opening level of the flow rate control valve (substituting the hot line circuit electromagnetic valve 23) based on the temperature of the outdoor air and the temperature of the hot line pipe 13A (operation S34).
  • the heating operation is performed such that the flow rate control valve (substituting the hot line circuit electromagnetic valve 23) is fully opened, and the evaporator side electromagnetic valve 47 is closed.
  • the temperature TA of the outdoor air is detected by the outdoor air temperature detecting device 22.
  • the temperature Tr of the hot line pipe 13A is detected by the hot line pipe temperature detecting device 21.
  • the hot line pipe 13A serves as an evaporator.
  • Tr ⁇ TA the opening level of the flow rate control valve (substituting the hot line circuit electromagnetic valve 23) is increased.
  • the refrigerant flowing through the hot line pipe 13A flows to the outdoor expansion valve 7 from the indoor expansion valve 6, and therefore, excessive heat radiation to the outdoor air is effectively prevented.
  • the same effect as the previous embodiment can be obtained. Furthermore, the opening level of the flow rate control valve (substituting the hot line circuit electromagnetic valve 23) is controlled to accurately control of the flow rate of the refrigerant flowing through the hot line pipe 13A. Consequently, the hot line function is more efficiently utilized.
  • the air conditioner 60 according to the present embodiment of FIGS. 8 and 9 is different from the air conditioner 40 according to the embodiment of FIGS. 5 and 6 in that, as shown in FIG. 8, the air conditioner 60 further includes: a pipe selection mechanism 61 disposed at at least one side of the hot line pipe 13A and the heat exchange part 8A to guide the refrigerant, in one direction, to the outdoor heat exchanger 8 from the outlet part of the compressor 12, instead of the guide mechanism 41 of the air conditioner 40 according to the embodiment of FIGS. 5 and 6.
  • the pipe selection mechanism 61 may include: a first opening/closing valve (an electromagnetic valve) 63 disposed on a pipe 62 connected between the four-way valve 11 and the heat exchange part 8A; a third bypass pipe 65 connecting the connection 44D and a connection 44F disposed between four-way valve 11 and the first opening/closing valve 63, the third bypass pipe 65 being substituted for the second bypass pipe 43; a third non-retum valve 66 disposed on the third bypass pipe 65; and a fourth non-retum valve 67, which is substituted for the hot line circuit electromagnetic valve 23.
  • a first opening/closing valve an electromagnetic valve
  • the third non-retum valve 66 is disposed such that the refrigerant flowing through the third bypass pipe 65 flows to the connection 44D from the connection 44F in one direction
  • the fourth non-return valve 67 is disposed such that the refrigerant flows to the connection 44D from the first diverging point 13a in one direction.
  • the opening level of the first opening/closing valve 63 and the opening level of the outdoor expansion valve 7 are controlled by a flow rate control device 69.
  • the first bypass pipe 42 and the hot line pipe temperature detecting device 21 are not provided in the air conditioner 60.
  • the outdoor expansion valve 7 is controlled to a predetermined opening level, and the first opening/closing valve 63 is constantly opened.
  • the refrigerant flows in the same fashion as in the air conditioner 1 according to the embodiment of FIG. 1.
  • the refrigerant reaching the first diverging point 13a flows through the hot line pipe 13A and the bypass pipe 13B.
  • the refrigerant flowing through the hot line pipe 13A and then passing through the fourth non-retum valve 67 flows through the lower part of the outdoor heat exchanger 8, not through the third bypass pipe 65, as a result of the third non-return valve 66, and then joins the refrigerant flowing through the bypass pipe 13B at the second diverging point 13b.
  • the joined refrigerant passes through the heat exchange part 8A of the outdoor heat exchanger 8 via the outdoor expansion valve 7, and then reaches the four-way valve 11 through the first opening/closing valve 63.
  • the air conditioner 60 according to the embodiment of FIGS. 8 and 9 provides the same effect as the air conditioner 1 according to the embodiment of FIG. 1.
  • the method of operating the air conditioner 60 includes: detecting the temperature of outdoor air TA with the outdoor air temperature detecting device 22 (operation S41); and guiding the refrigerant, in one direction, to the outdoor heat exchanger 8 from the outlet part of the compressor 12 through either the hot line pipe 13A or the entire area of the outdoor heat exchanger 8 based on the detected temperature of the outdoor air (operation S42).
  • operation S41 The operation of detecting the temperature of the outdoor air with the outdoor air temperature detecting device 22 (operation S41) is identical to the operation of detecting the temperature of the outdoor air with the outdoor air temperature detecting device 22 according to the embodiments of FIGS. 1-7 of the present general inventive concept.
  • the operation of guiding the refrigerant includes: allowing the refrigerant to flow only through the hot line pipe 13A (operation S42A); and allowing the refrigerant to flow through the entire area of the outdoor heat exchanger 8 (operation S42B).
  • the cooling operation is performed.
  • the outdoor expansion valve 7 is controlled to a predetermined opening level, and the first opening/closing valve 63 is opened to drive a cooling cycle.
  • operation S41 the operation of detecting the temperature of the outdoor air is performed to detect the temperature TA of the outdoor air.
  • the outdoor expansion valve 7 is fully closed, and the first opening/closing valve 63 is closed.
  • the refrigerant discharged from the compressor 12 flows to the connection 44F via the four-way valve 11, flows into the hot line pipe 13A via the third non-return valve 66, and is then guided to the indoor expansion valve 6 through the bypass pipe 13B.
  • the outdoor expansion valve 7 and the first opening/closing valve 63 are closed, and therefore, no refrigerant passes through the heat exchange part 8A.
  • operation S41 the operation of detecting the temperature of the outdoor air (operation S41) is repeated to detect the temperature TA of the outdoor air. If TA ⁇ ⁇ , the operation of allowing the refrigerant to flow only through the hot line pipe 13A (operation S42A) is repeatedly performed.
  • the outdoor expansion valve 7 is opened to the predetermined opening level, and the first opening/closing valve 63 is opened.
  • the refrigerant discharged from the compressor 12 flows to the connection 44F via the four-way valve 11, and is then guided to the heat exchange part 8A via the first opening/closing valve 63.
  • the refrigerant is guided to the third bypass pipe 65 from the connection 44F via the third non-retum valve 66. Also, the refrigerant flows through the hot line pipe 13A.
  • both the hot line pipe 13A and the heat exchange part 8A of the outdoor heat exchanger 8 serves as the evaporator, where heat exchange is performed.
  • the refrigerant compressed in the outdoor heat exchanger 8 is guided to the indoor expansion valve 6 from the outdoor expansion valve 7 through the bypass pipe 13B.
  • the status of the outdoor expansion valve 7 and the first opening/closing valve 63 at the respective operations described above is indicated in Table 1.
  • the refrigerant passing through the outdoor heat exchanger 8 is divided into two predetermined amounts by the pipe selection mechanism 61. Consequently, flow rate of the refrigerant passing through the outdoor heat exchanger 8 is minimized when the refrigerant discharged from the compressor 12 flows only through the hot line pipe 13A. In this case, only the hot line pipe 13A serves as the evaporator, and therefore, the heat exchange capacity is decreased. Consequently, the refrigerant maintained in a high-temperature and high-pressure state is guided to the indoor unit 2.
  • the compressor 12 can be operated in a continuous fashion. Consequently, the cooling operation at a predetermined temperature is accomplished, and durability of the compressor 12 is increased.
  • the air conditioner 70 according to the present embodiment of FIGS. 10 and 11 is different from the air conditioner 60 according to the previous embodiment in that, as illustrated in FIG. 10, the air conditioner 70 further includes: a pipe selection mechanism 71 having a discharge pressure detecting device 72 disposed adjacent to the compressor 12 to detect discharge pressure of the compressor 12 and a second opening/closing valve (an electromagnetic valve) 73, which is substituted for the first non-retum valve 45 of the air conditioner 40 according to FIG 5.
  • a pipe selection mechanism 71 having a discharge pressure detecting device 72 disposed adjacent to the compressor 12 to detect discharge pressure of the compressor 12 and a second opening/closing valve (an electromagnetic valve) 73, which is substituted for the first non-retum valve 45 of the air conditioner 40 according to FIG 5.
  • the discharge pressure detecting device 72 is controlled by a flow rate control device 74.
  • the outdoor expansion valve 7 is controlled to a predetermined opening level, and the first and second opening/closing valves 63 and 73 are constantly opened.
  • the air conditioner 70 provides the same operation and effect as the air conditioner 60 according to the embodiment of FIG. 8.
  • the method of operating the air conditioner 70 includes: detecting the temperature of outdoor air with the outdoor air temperature detecting device 22 (operation S51); detecting discharge pressure of the compressor 12 with the discharge pressure detecting device 72 (operation S52); interrupting guide of the refrigerant not only through the hot line pipe 13A but also through the heat exchange part 8A (operation S53); and guiding the refrigerant, in one direction, to the outdoor heat exchanger 8 from the outlet part of the compressor 12 through either the hot line pipe 13A or the entire area of the outdoor heat exchanger 8 based on the detected temperature of the outdoor air and the detected discharge pressure of the compressor 12 (operation S54).
  • the operation of guiding the refrigerant includes: allowing the refrigerant to flow only through the hot line pipe 13A (operation S54A); and allowing the refrigerant to flow through the entire area of the outdoor heat exchanger 8 (operation S54B).
  • the operation of detecting the temperature of the outdoor air (operation S51) and the operation of detecting discharge pressure of the compressor 12 (operation S52) are performed to detect the temperature TA of the outdoor air and the discharge pressure Pd of the compressor 12, respectively.
  • the outdoor expansion valve 7 is fully closed, and the first and second opening/closing valves 63 and 73 are closed. At this time, the refrigerant does not flow in the cooling cycle although the refrigerant is discharged from the compressor 12. As a result, the discharge pressure is quickly increased.
  • the refrigerant passes through the outdoor heat exchanger 8, and therefore, the refrigerant discharged from the compressor 12 is maintained at a high-pressure state.
  • the outdoor expansion valve 7 is opened to the predetermined opening level, and the first and second opening/closing valves 63 and 73 are opened.
  • the refrigerant discharged from the compressor 12 flows through the entire area of the outdoor heat exchanger 8 such that heat exchange is performed, like the operation of allowing the refrigerant to flow through the entire area of the outdoor heat exchanger 8 (operation S42B) according to the embodiment of FIG. 8.
  • the status of the outdoor expansion valve 7, the first opening/closing valve 63, and the second opening/closing valve 73 at the respective operations described above is indicated in Table 2.
  • Outdoor expansion valve (7) First opening/closing valve (63) Second opening/closing valve (73) Cooling operation (Normal) Predetermined opening level Opened Opened Heating operation Controlled Opened Opened Cooling & low outdoor air temperature Condition 1 Fully closed Closed Closed Condition 2 Fully closed Closed Opened Condition 3 Predetermined opening level Opened Opened
  • the operation of interrupting guide of the refrigerant not only through the hot line pipe 13A, but also through the heat exchange part 8A (operation S53), is performed. Consequently, the discharge pressure of the compressor 12 can be quickly increased, and therefore, rising time of the entire cooling cycle right before the initiation of the operation of the air conditioner is reduced.
  • the discharge pressure of the compressor 12 is directly detected by the discharge pressure detecting device 72, and flow of the refrigerant is controlled based on the detected temperature of the outdoor air. Consequently, more accurate condensing pressure control can be performed than when the operation is controlled only based on the detected temperature of the outdoor air, and therefore, the refrigerant is maintained in a high-pressure state.
  • Components of the air conditioner 80 according to the present embodiment which are the same to those of the air conditioner according to any one of the previous embodiments of the present invention, are indicated by the same reference numerals as those of the air conditioner according to any one of the previous embodiments of the present invention, and therefore a detailed description thereof will not be given.
  • the air conditioner 80 according to the embodiment of FIGS. 12 and 13 is different from the air conditioner 70 according to the embodiment of FIGS. 10 and 11 in that the air conditioner 80 further includes: a pipe selection mechanism 81 having a non-step flow rate control valve 82, which is substituted for the second opening/closing 73 of the pipe selection mechanism 71 of the air conditioner 70 according to the embodiment of FIG. 10.
  • the flow rate control valve 82 as well as other valves is controlled by a flow rate control device 83.
  • the outdoor expansion valve 7 is controlled to a predetermined opening level, the first opening/closing valve 63 is opened, and the flow rate control valve 82 is fully opened.
  • the air conditioner 80 according to FIG. 12 provides the same operation and effect as the air conditioner 70 according to the embodiment of FIG. 10.
  • the method of operating the air conditioner 80 includes: detecting the temperature of outdoor air with the outdoor air temperature detecting device 22 (operation S61); detecting discharge pressure of the compressor 12 with the discharge pressure detecting device 72 (operation S62); and guiding the refrigerant, in one direction, to the outdoor heat exchanger 8 from the outlet part of the compressor 12 through either the hot line pipe 13A or the entire area of the outdoor heat exchanger 8 based on the detected temperature of the outdoor air and the detected discharge pressure of the compressor 12 (operation S63).
  • the operation of guiding the refrigerant includes: allowing the refrigerant to flow only through the hot line pipe 13A (operation S63A); gradually increasing flow rate of the refrigerant flowing through the hot line pipe 13A (operation S63B); and allowing the refrigerant to flow through the entire area of the outdoor heat exchanger 8 (operation S63C).
  • the outdoor expansion valve 7 and the flow rate control valve 82 are controlled to predetermined opening levels, respectively, and the first opening/closing valve 63 is opened such that the refrigerant is guided. Subsequently, the operation of detecting the temperature of the outdoor air (operation S61) and the operation of detecting discharge pressure of the compressor 12 (operation S62) are performed to detect the temperature TA of the outdoor air and the discharge pressure Pd of the compressor 12, respectively.
  • the outdoor expansion valve 7 is fully closed, the first opening/closing valve 63 is closed, and the flow rate control valve 82 is closed such that the flow rate control valve 82 assumes the predetermined opening level.
  • the pressure discharged from the compressor and flowing through hot line pipe 13A is increased. Since the outdoor expansion valve 7 is fully closed and the first opening/closing valve 63 is closed, no refrigerant passes through the heat exchange part 8A.
  • the outdoor expansion valve 7 and the first opening/closing valve 63 are unchanged, and the flow rate control valve 82 is opened to the predetermined opening level.
  • the operation of detecting the temperature of the outdoor air (operation S61) and the operation of detecting discharge pressure of the compressor 12 (operation S62) are performed to detect the temperature TA of the outdoor air and the discharge pressure Pd of the compressor 12, respectively. If TA ⁇ ⁇ and Pd ⁇ ⁇ (Condition 5), the operation of allowing the refrigerant to flow through the entire area of the outdoor heat exchanger 8 (operation S63C) is performed.
  • the outdoor expansion valve 7 is opened to the predetermined opening level, the first opening/closing valve 63 is opened, and the flow rate control valve 82 is fully opened.
  • the refrigerant discharged from the compressor 12 flows through the entire area of the outdoor heat exchanger 8, as in any one of the previous embodiments of the present general inventive concept.
  • the status of the outdoor expansion valve 7, the first opening/closing valve 63, and the flow rate control valve 82 at the respective operations described above is indicated in Table 3.
  • Outdoor expansion valve (7) First opening/closing valve (63) Flow rate control valve (82) Cooling operation (Normal) Predetermined opening level Opened Fully opened Heating operation Controlled Opened Fully opened Cooling & low outdoor air temperature Condition 3 Fully closed Closed Controlled Condition 4 Fully closed Closed Controlled Condition 5 Fully closed Closed Controlled Condition 6 Predetermined opening level Opened Fully opened
  • the flow rate control valve 82 is provided instead of the second opening/closing valve 73 of the air conditioner 70 according to the previous embodiment of the present general inventive concept. Consequently, the discharge pressure of the compressor 12 can be more stably controlled than when only the opening/closing control is performed, and therefore, equalization of the refrigerant pressure in the cooling cycle is more appropriately accomplished, and more stable air conditioning is accomplished.
  • any of the air conditioners may be controlled such that the refrigerant may flow only through the heat exchange part 8A of the outdoor heat exchanger 8 based on operation conditions, although the refrigerant is guided, in one direction, to the outdoor heat exchanger 8 from the outlet part of the compressor 12 through either the hot line pipe 13A or the entire area of the outdoor heat exchanger 8 in the operation method of the air conditioner according to any one of the embodiments of FIGS. 8-13 when the cooling operation is performed.
  • the present general inventive concept has the effect of improving heating efficiency of the air conditioner.
  • the predetermined high and low pressure of the refrigerant is maintained even when the cooling operation is performed in the state of low outdoor air temperature. Consequently, the present general inventive concept has the effect of improving reliability of the compressor and cooling efficiency of the air conditioner.
  • no refrigerant remains in the part(s) of the air conditioner not used as the cooling cycle when the operation is performed. Consequently, the present general inventive concept has the effect of improving reliability of the cooling cycle.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP05013389A 2004-06-24 2005-06-21 Kälteanlage und Verfahren zum Betrieb derselben Withdrawn EP1610076A3 (de)

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JP2004186230 2004-06-24
JP2004186230 2004-06-24
JP2005163347A JP4122349B2 (ja) 2004-06-24 2005-06-02 冷凍サイクル装置及びその運転方法
JP2005163347 2005-06-02

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WO2011148071A1 (fr) * 2010-05-25 2011-12-01 Peugeot Citroën Automobiles SA Installation de chauffage/climatisation à condenseur et évaporateur externes et contigus pour le chauffage de l'évaporateur externe
CN103294086A (zh) * 2012-02-27 2013-09-11 上海微电子装备有限公司 一种恒温液循环装置及温控方法
CN105157291A (zh) * 2015-09-22 2015-12-16 广东志高暖通设备股份有限公司 一种空调化霜方法、室外换热器及空调系统
CN111765594A (zh) * 2019-04-02 2020-10-13 珠海格力电器股份有限公司 一种自动除霜的空调系统及其控制方法
EP3951287A4 (de) * 2019-03-28 2022-03-30 Mitsubishi Electric Corporation Kältekreislaufvorrichtung

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CN102150001B (zh) * 2008-09-08 2014-04-09 开利公司 减小水截留的微通道热交换器模块设计
KR101572845B1 (ko) * 2009-08-19 2015-11-30 엘지전자 주식회사 공기조화기
JP5310488B2 (ja) * 2009-11-04 2013-10-09 パナソニック株式会社 冷凍サイクル装置及びそれを用いた温水暖房装置
CN103900310B (zh) * 2014-04-17 2016-04-13 东南大学 溶液除湿预防空气源热泵热水器结霜的系统及方法
JP6272481B2 (ja) * 2014-07-01 2018-01-31 三菱電機株式会社 空気調和装置
CN104634032B (zh) * 2015-01-30 2017-02-22 广东美的制冷设备有限公司 化霜速率调节方法、化霜速率调节装置和空调器
JP6573484B2 (ja) * 2015-05-29 2019-09-11 日立ジョンソンコントロールズ空調株式会社 熱交換器
CN104879945A (zh) * 2015-06-26 2015-09-02 珠海格力电器股份有限公司 空调系统和热泵机组
KR102494571B1 (ko) * 2016-05-13 2023-02-02 엘지전자 주식회사 히트 펌프
CN106091265B (zh) * 2016-06-17 2018-11-27 广东美的制冷设备有限公司 空调器的控制方法
CN108362027B (zh) 2018-01-17 2020-01-31 珠海格力电器股份有限公司 一种热泵系统及其控制方法
CN108895722A (zh) * 2018-05-25 2018-11-27 广东芬尼克兹节能设备有限公司 一种空气源换热器系统
CN114198857B (zh) * 2021-11-17 2023-02-28 青岛海尔空调电子有限公司 一种空调控制方法及空调系统

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Publication number Priority date Publication date Assignee Title
WO2011148071A1 (fr) * 2010-05-25 2011-12-01 Peugeot Citroën Automobiles SA Installation de chauffage/climatisation à condenseur et évaporateur externes et contigus pour le chauffage de l'évaporateur externe
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CN103294086A (zh) * 2012-02-27 2013-09-11 上海微电子装备有限公司 一种恒温液循环装置及温控方法
CN103294086B (zh) * 2012-02-27 2015-06-17 上海微电子装备有限公司 一种恒温液循环装置及温控方法
CN105157291A (zh) * 2015-09-22 2015-12-16 广东志高暖通设备股份有限公司 一种空调化霜方法、室外换热器及空调系统
EP3951287A4 (de) * 2019-03-28 2022-03-30 Mitsubishi Electric Corporation Kältekreislaufvorrichtung
CN111765594A (zh) * 2019-04-02 2020-10-13 珠海格力电器股份有限公司 一种自动除霜的空调系统及其控制方法
CN111765594B (zh) * 2019-04-02 2021-11-30 珠海格力电器股份有限公司 一种自动除霜的空调系统及其控制方法

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KR20060048272A (ko) 2006-05-18
JP2006038447A (ja) 2006-02-09

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