EP2012078A1 - Ausseneinheit - Google Patents

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Publication number
EP2012078A1
EP2012078A1 EP07740285A EP07740285A EP2012078A1 EP 2012078 A1 EP2012078 A1 EP 2012078A1 EP 07740285 A EP07740285 A EP 07740285A EP 07740285 A EP07740285 A EP 07740285A EP 2012078 A1 EP2012078 A1 EP 2012078A1
Authority
EP
European Patent Office
Prior art keywords
outdoor
fan
frost
rotational speed
outdoor unit
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Withdrawn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
EP07740285A
Other languages
English (en)
French (fr)
Other versions
EP2012078A4 (de
Inventor
Hideki Sangenya
Katsunori Murata
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries 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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP2012078A1 publication Critical patent/EP2012078A1/de
Publication of EP2012078A4 publication Critical patent/EP2012078A4/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Withdrawn legal-status Critical Current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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0294—Control issues related to the outdoor fan, e.g. controlling speed
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound
    • 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
    • F25B2600/23—Time delays
    • 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
    • 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
    • F25B2700/2117—Temperatures of an evaporator

Definitions

  • the present invention relates to an outdoor unit of an air conditioner that includes an outdoor fan that applies air to an outdoor heat exchanger to promote heat exchange and which controls the rotational speed of the outdoor fan during frost formation on the outdoor heat exchanger.
  • An outdoor heat exchanger and an outdoor fan that generates an air flow are disposed inside an outdoor unit of an air conditioner.
  • the outdoor heat exchanger becomes an evaporator, and as operating time elapses, frost begins to cover the surface of the outdoor heat exchanger.
  • frost formation further progresses, ventilation resistance occurs, and the potential for this to lead to performance degradation is high.
  • control for increasing input to the motor that causes the outdoor fan to rotate and maintaining the rotational speed at a constant or increasing the rotational speed is widely employed (e.g., see Patent Document 1).
  • An outdoor unit pertaining to a first aspect of the present invention is an outdoor unit of an air conditioner to which an indoor unit is connected, with the outdoor unit comprising an outdoor heat exchanger, an outdoor fan and a controller.
  • the outdoor heat exchanger performs heat exchange with air as an evaporator during heating operation.
  • the outdoor fan generates an air flow that passes a surface of the outdoor heat exchanger.
  • the controller performs in-frost fan control for lowering the rotational speed of the outdoor fan when frost formation on the outdoor heat exchanger is detected or estimated.
  • An outdoor unit pertaining to a second aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein the in-frost fan control is not executed until a predetermined amount of time elapses after the start of heating operation.
  • heating operation is maintained for a predetermined amount of time, so warm air can be provided even when operation is started in low outdoor air.
  • An outdoor unit pertaining to a third aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein lowering a target rotational speed of the outdoor fan that is set beforehand is included in the in-frost fan control.
  • An outdoor unit pertaining to a fourth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein lowering an upper limit of an input value that is supplied to the outdoor fan is included in the in-frost fan control.
  • An outdoor unit pertaining to a fifth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein the in-frost fan control is executed when a predetermined amount of time elapses after the start of heating operation and an evaporating temperature of the outdoor heat exchanger falls below a predetermined temperature.
  • frost formation is detected without having to use a special device, and the blowing noise is suppressed.
  • An outdoor unit pertaining to a sixth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein the in-frost fan control is executed when a predetermined amount of time elapses after the start of heating operation and the outdoor air temperature falls below a predetermined temperature.
  • frost formation is detected without having to use a special device, and the blowing noise is suppressed.
  • An outdoor unit pertaining to a seventh aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein the in-frost fan control is executed when a predetermined amount of time elapses after the start of heating operation and a low pressure side falls below a predetermined pressure.
  • frost formation is detected without having to use a special device, and the blowing noise is suppressed.
  • An outdoor unit pertaining to an eighth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein the in-frost fan control is executed when a predetermined amount of time elapses after the start of heating operation and an ON time ratio during one cycle of a drive voltage that is supplied to the outdoor fan exceeds an ON time ratio that is set beforehand.
  • frost formation is detected without having to use a special device, and the blowing noise is suppressed.
  • An outdoor unit pertaining to a ninth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein the in-frost fan control is executed when a predetermined amount of time elapses after the start of heating operation and the rotational speed of the outdoor fan falls below a target rotational speed that is set beforehand.
  • frost formation is detected without having to use a special device, and the blowing noise is suppressed.
  • An outdoor unit pertaining to a tenth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein an average value of an input that is supplied to the outdoor fan is calculated at a previous stage when the in-frost fan control is started, and while the in-frost fan control is being executed, the average value of the input is supplied to the outdoor fan.
  • An outdoor unit pertaining to an eleventh aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein when the in-frost fan control is being performed, defrosting operation is started when the rotational speed of the outdoor fan falls below a lower limit rotational speed that is set beforehand.
  • heating capability drops because of the in-frost fan control, so the rotational speed of the outdoor fan is monitored to prevent heating capability from dropping below an acceptable range. For this reason, when frost formation progresses to an extent that an increase in the blowing noise cannot be suppressed, defrosting operation is timely started, so heating performance recovers before the user is caused to feel insufficient heating.
  • An outdoor unit pertaining to a twelfth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein when the in-frost fan control is being performed, defrosting operation is started when a difference between the rotational speed of the outdoor fan and the rotational speed of the outdoor fan before frost formation exceeds an acceptable value that is set beforehand.
  • heating capability drops because of the in-frost fan control, so the difference between the rotational speed of the outdoor fan and the rotational speed of the outdoor fan before frost formation is monitored to prevent heating capability from dropping below an acceptable range. For this reason, when frost formation progresses to an extent that an increase in the blowing noise cannot be suppressed, defrosting operation is timely started, so heating performance recovers before the user is caused to feel insufficient heating.
  • An outdoor unit pertaining to a thirteenth aspect of the present invention comprises the outdoor unit pertaining to the first aspect of the present invention, wherein when the in-frost fan control is being performed, defrosting operation is started when an integrated value of a difference between the rotational speed of the outdoor fan and the rotational speed of the outdoor fan before frost formation exceeds an acceptable integrated value that is set beforehand.
  • heating capability drops because of the in-frost fan control, so the integrated value of the difference between the rotational speed of the outdoor fan before frost formation and the current rotational speed is monitored to prevent heating capability from dropping below an acceptable range. For this reason, when frost formation progresses to an extent that an increase in the blowing noise cannot be suppressed, defrosting operation is timely started, so heating performance recovers before the user is caused to feel insufficient heating.
  • defrosting operation is not erroneously started even when a gusty backwind acts on the outdoor fan such that the rotational speed instantaneously sharply drops or even when the power source voltage drops such that the rotational speed of the outdoor fan sharply drops.
  • the amount of increase in the blowing noise is small even when ventilation resistance increases because of frost formation. For this reason, unpleasant noise is suppressed.
  • heating operation is maintained for a predetermined amount of time, so warm air can be provided even when operation is started in low outdoor air.
  • the rotational speed of the outdoor fan drops during frost formation and the amount of increase in the blowing noise becomes small. For this reason, noise is suppressed.
  • frost formation is detected without having to use a special device, and the blowing noise is suppressed.
  • the rotational speed of the outdoor fan automatically drops because of ventilation resistance resulting from frost formation. For this reason, the amount of increase in the blowing noise becomes small.
  • FIG. 1 shows a refrigerant circuit of an air conditioner that includes an outdoor unit pertaining to an embodiment of the present invention.
  • An air conditioner 1 is a multi-type air conditioner and has a configuration where plural indoor units 3 are connected in parallel with respect to one outdoor unit 2.
  • a refrigerant circuit 10 of the air conditioner 1 is one where mainly a compressor 11, a four-way switch valve 12, an outdoor heat exchanger 13, expansion valves 14 and indoor heat exchangers 16 are connected in order, and becomes a vapor compression type refrigeration cycle.
  • the compressor 11 is a variable capacity inverter compressor that performs rotational speed control by an inverter.
  • an accumulator 20 that separates liquid refrigerant and gas refrigerant is disposed on a suction pipe side of the compressor 11.
  • the compressor 11, the four-way switch valve 12, the outdoor heat exchanger 13 and the expansion valves 14 are included in the outdoor unit 2, and the indoor heat exchangers 16 are included in the indoor units 3. Further, the four-way switch valve 12 and the indoor heat exchangers 16 are interconnected by refrigerant communication pipes 17a, and the expansion valves 14 and the indoor heat exchangers 16 are interconnected by refrigerant communication pipes 17b.
  • the refrigerant communication pipes 17a and 17b are disposed between the outdoor unit 2 and the indoor units 3.
  • a gas side stop valve 18 and a liquid side stop valve 19 are disposed in the refrigerant circuit inside the outdoor unit 2. The gas side stop valve 18 is disposed on the four-way switch valve 12 side, and the liquid side stop valve 19 is disposed on the expansion valves 14 side.
  • the refrigerant communication pipes 17a are connected to the gas side stop valve 18, and the refrigerant communication pipes 17b are connected to the liquid side stop valve 19. These stop valves 18 and 19 are placed in a closed state when the outdoor unit 2 and the indoor units 3 are to be installed. Then, the stop valves 18 and 19 are placed in an opened state after the outdoor unit 2 and the indoor units 3 have been installed on-site and the refrigerant communication pipes 17a and the refrigerant communication pipes 17b have been connected to the stop valves 18 and 19.
  • an outdoor fan 29 that generates an air flow in order to promote heat exchange between air and the outdoor heat exchanger 13 is disposed in the outdoor unit 2.
  • the air conditioner 1 that includes the outdoor unit 2 of the present embodiment is disposed with many temperature sensors that comprise thermistors.
  • An outdoor temperature sensor 102 detects the ambient temperature where the outdoor unit 2 is installed, and a discharge pipe temperature sensor 111 is attached to a discharge pipe of the compressor 11 and detects a discharge pipe temperature To.
  • An evaporating temperature sensor 113 during heating operation is attached to the outdoor heat exchanger 13 and detects an evaporating temperature Te, and liquid pipe temperature sensors 117 are attached to exit sides during heating operation of the indoor heat exchangers 16 and detect a liquid pipe temperature T1.
  • a low pressure side pressure sensor 213 that detects a low pressure side pressure is disposed between the four-way switch valve 12 and the outdoor heat exchanger 13.
  • a controller 4 controls operation of the air conditioner 1 on the basis of the detected values of these temperature sensors and the detected value of the pressure sensor.
  • the four-way switch valve 12 is held in a state indicated by solid lines in FIG. 1 .
  • High-temperature high-pressure gas refrigerant that has been discharged from the compressor 11 flows into the outdoor heat exchanger 13 via the four-way switch valve 12, exchanges heat with outdoor air, and condenses/liquefies.
  • the refrigerant that has liquefied is depressurized to a predetermined low pressure by the expansion valves 14, exchanges heat with indoor air in the indoor heat exchangers 16, and evaporates.
  • the indoor air that has been cooled by the evaporation of the refrigerant is blown out into the indoors by unillustrated indoor fans and cools the indoors.
  • the refrigerant that has evaporated and gasified in the indoor heat exchangers 16 returns to the outdoor unit 2 through the refrigerant communication pipes 17a and is sucked into the compressor 11.
  • the four-way switch valve 12 is held in a state indicated by dash lines in FIG. 1 .
  • High-temperature high-pressure gas refrigerant that has been discharged from the compressor 11 flows into the indoor heat exchangers 16 of the indoor units 3 via the four-way switch valve 12, exchanges heat with the indoor air, and condenses/liquefies.
  • the indoor air that has been heated by the condensing of the refrigerant is blown out into the indoors by the indoor fans and heats the indoors.
  • the refrigerant that has liquefied in the indoor heat exchangers 16 returns to the outdoor unit 2 through the refrigerant communication pipes 17b.
  • the refrigerant that has returned to the outdoor unit 2 is depressurized to a predetermined low pressure by the expansion valves 14, exchanges heat with the outdoor air in the outdoor heat exchanger 13, and evaporates. Then, the refrigerant that has evaporated and gasified in the outdoor heat exchanger 13 is sucked into the compressor 11 via the four-way switch valve 12.
  • the outdoor fan 29 is disposed with a motor 29a.
  • the motor 29a is a long-lifespan DC brushless motor and can change the rotational speed by controlling (DUTY controlling) the ON time ratio (DUTY ratio) during one cycle of a power source input.
  • the rotational speed is detected by a rotational speed sensor 129 comprising a Hall IC that is disposed on the motor 29a.
  • FIG. 3 is a showing "the relationship between outdoor fan input, outdoor fan rotational speed and outdoor fan blowing noise in a case where the outdoor unit is controlled by in-frost normal control", with the horizontal axis representing elapsed time after the start of heating operation and with the vertical axes representing, in order from the bottom, outdoor fan input, outdoor fan rotational speed and outdoor fan blowing noise.
  • FIG. 2 is a control block diagram of the air conditioner 1 that includes the outdoor unit 2 of the present embodiment.
  • the controller 4 receives, by a frost formation detector 41, the detected values from the outdoor temperature sensor 102, the evaporating temperature sensor 113, the outdoor fan rotational speed sensor 129 and the low pressure side pressure sensor 213, performs detection or estimation of frost formation on the outdoor heat exchanger 13, and controls the outdoor fan 29 via an outdoor fan controller 42.
  • the controller 4 maintains the outdoor fan input at a constant to ensure that the outdoor fan rotational speed drops when frost formation on the outdoor heat exchanger 13 begins and ventilation resistance begins to increase in order to prevent an increase in the blowing noise of the outdoor fan 29. This is in-frost fan control, and the amount of increase in the blowing noise is suppressed thereby.
  • FIG. 4 is a graph showing the "relationship between outdoor fan input, outdoor fan rotational speed and outdoor fan blowing noise in a case where the outdoor unit is controlled by in-frost fan control", with the horizontal axis representing elapsed time after the start of heating operation and the vertical axes representing, in order from the bottom, outdoor fan input, outdoor fan rotational speed and outdoor fan blowing noise.
  • TD time after the start of heating operation
  • the vertical axes representing, in order from the bottom, outdoor fan input, outdoor fan rotational speed and outdoor fan blowing noise.
  • FIG. 5 is a flowchart of in-frost fan control.
  • counting of the elapsed time TD after the start of heating operation is started in S 1.
  • After standing by for a certain amount of time (TD2) in S2 it is determined in S3 whether or not the outdoor air temperature is less than a predetermined temperature (Doadef), and if YES, then an average value of the outdoor fan input is calculated in S4.
  • Doadef a predetermined temperature
  • the controller moves to S5 and determines whether or not the amount of time TD that has elapsed after counting has been started has reached a predetermined amount of time (TD1), and if YES, then the controller determines in S6 whether or not the evaporating temperature (outdoor heat exchanger temperature) is less than a predetermined temperature (Tedef). If YES in S6, then the controller moves to S7 to ensure that the outdoor fan input is such that the average value of the input that was determined in S4 is maintained. It will be noted that when the determination in any of S3, S5 or S6 is NO, then the controller enters normal control. S1 to S7 are a starting condition of in-frost fan control, and S7 is in-frost fan control operation.
  • the in-frost fan control In the in-frost fan control, the input to the outdoor fan 29 becomes constant during frost formation, so the rotational speed of the outdoor fan 29 drops in response to ventilation resistance and an increase in the blowing noise of the outdoor fan 29 is suppressed.
  • the frost on the outdoor heat exchanger 13 continues to grow, so there is also a limit on blowing noise suppression resulting from the drop in the rotational speed of the outdoor fan 29.
  • the in-frost fan control is control that suppresses an increase in the blowing noise while lowering heating performance, so indefinitely continuing the in-frost fan control significantly lowers heating performance and causes the user to feel insufficient heating. Consequently, it is necessary to switch to defrosting control under a predetermined condition.
  • FIG. 6 is a graph showing the relationship between outdoor fan input, outdoor fan rotational speed, outdoor fan blowing noise and frost formation amount in a case where in-frost fan control is continued.
  • the frost formation amount increases excessively, the amount of increase in the blowing noise becomes large even if the rotational speed of the outdoor fan 29 were to continue to drop, and eventually the blowing noise reaches an acceptable limit value Qs.
  • the rotational speed of the outdoor fan 29 at this time is a lower limit rotational speed Ns.
  • defrosting control is executed when the outdoor heat exchanger temperature falls in a predetermined amount of time below a "target outdoor heat exchanger temperature" that is calculated from the operating frequency of the compressor 11 and the outdoor air temperature.
  • a target outdoor heat exchanger temperature that is calculated from the operating frequency of the compressor 11 and the outdoor air temperature.
  • the controller 4 judges that the frost formation amount has increased and that the blowing noise has reached the acceptable limit value Qs and switches from in-frost fan control to defrosting control.
  • FIG. 7 is a flowchart from the start of in-frost fan control to until the start of defrosting control.
  • the controller 4 maintains the input to the outdoor fan 29 at a constant in step S 11.
  • the controller 4 detects a rotational speed N of the outdoor fan 29.
  • the controller 4 determines whether or not the rotational speed N of the outdoor fan 29 has fallen below the lower limit rotational speed Ns.
  • the controller 4 determines NO in step S 13 then the controller 4 returns to step S12.
  • the rotational speed of the outdoor fan 29 can be lowered to an extent where a blowing noise controlling effect is obtained and without causing the user to feel insufficient heating, so the effect of in-frost fan control can be exhibited to a maximum.
  • the controller 4 determines that the blowing noise has reached the acceptable limit value Qs when the rotational speed of the outdoor fan 29 has fallen below the lower limit rotational speed Ns, but the present invention is not limited to this; for example, the controller 4 may also determine that the blowing noise has reached the acceptable limit value Qs when the difference with the rotational speed of the outdoor fan 29 before frost formation has exceeded an acceptable value L.
  • the rotational speed of the outdoor fan 29 before frost formation employs an average value of the rotational speed of the outdoor fan 29 that has been sampled after previous defrosting control. Below, this will be described using the drawings.
  • FIG. 8 is a flowchart from the start of in-frost fan control to until the start of defrosting control of an outdoor unit pertaining to a first modification of the embodiment of the present invention.
  • the controller 4 maintains the input to the outdoor fan 29 at a constant in step S21.
  • the controller 4 stores a rotational speed Na of the outdoor fan 29 before frost formation.
  • the controller 4 detects the rotational speed N of the outdoor fan 29.
  • step S24 the controller 4 determines whether or not the difference (Na - N) between the rotational speed Na of the outdoor fan 29 before frost formation and the rotational speed N of the outdoor fan 29 that has been detected exceeds the acceptable value L.
  • the controller 4 determines YES in step S24, then the controller 4 switches to defrosting control in step S25.
  • the controller 4 determines NO in step S24, then the controller 4 returns to step S23.
  • the controller 4 performs determination to switch to defrosting control on the basis of the instantaneous rotational speed of the outdoor fan 29; thus, for example, when natural wind counter to the blowing direction of the outdoor fan 29 strikes the outdoor fan 29 such that the rotational speed instantaneously drops, or when the power source voltage drops and the rotational speed of the outdoor fan 29 instantaneously drops, there is the potential for the controller 4 to erroneously switch to defrosting control.
  • the controller 4 switches to defrosting control when an integrated value of the difference with the rotational speed of the outdoor fan 29 before frost formation exceeds an acceptable integrated value.
  • FIG. 9 is a flowchart from the start of in-frost fan control to until the start of defrosting control of an outdoor unit pertaining to a second modification of the embodiment of the present invention.
  • the controller 4 maintains the input to the outdoor fan 29 at a constant in step S31.
  • the controller 4 stores the rotational speed Na of the outdoor fan 29 before frost formation.
  • the controller 4 detects a rotational speed Ni of the outdoor fan 29 i times (e.g., 5 times) every t seconds (e.g., 60 seconds).
  • step S34 the controller 4 determines whether or not an integrated value ⁇ (Na - Ni) of the difference between the rotational speed Na of the outdoor fan 29 before frost formation and each rotational speed of the outdoor fan 29 that has been detected exceeds an acceptable integrated value M.
  • the controller 4 determines YES in step S34, then the controller 4 switches to defrosting control in step S35.
  • the controller 4 determines NO in step S34, then the controller 4 returns to step S33.
  • defrosting operation may also be started when the integrated value of the difference between the rotational speed of the outdoor fan 29 and the rotational speed of the outdoor fan 29 before frost formation exceeds the acceptable integrated value M.
  • defrosting operation is not erroneously started.
  • the outdoor unit of the present invention is effective as an outdoor unit of an air conditioner and the blowing noise of the outdoor fan is small during frost formation.

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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)
EP07740285A 2006-03-31 2007-03-29 Ausseneinheit Withdrawn EP2012078A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006099386 2006-03-31
JP2006345396A JP4270274B2 (ja) 2006-03-31 2006-12-22 室外機
PCT/JP2007/056847 WO2007114243A1 (ja) 2006-03-31 2007-03-29 室外機

Publications (2)

Publication Number Publication Date
EP2012078A1 true EP2012078A1 (de) 2009-01-07
EP2012078A4 EP2012078A4 (de) 2009-11-18

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EP07740285A Withdrawn EP2012078A4 (de) 2006-03-31 2007-03-29 Ausseneinheit

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EP (1) EP2012078A4 (de)
JP (1) JP4270274B2 (de)
AU (1) AU2007232984B2 (de)
WO (1) WO2007114243A1 (de)

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CN103557651A (zh) * 2013-10-25 2014-02-05 周晓明 一种风冷热泵空调智能除霜方法
EP2853844A1 (de) * 2013-09-13 2015-04-01 Robert Bosch Gmbh Verfahren zum Enteisen einer Wärmepumpe
US20160201960A1 (en) * 2013-08-23 2016-07-14 Sanden Holdings Corporation Vehicle air conditioner
EP3258190A4 (de) * 2016-01-12 2018-04-11 Mitsubishi Electric Corporation Klimaanlage
EP3225930A4 (de) * 2014-11-26 2018-07-18 Hitachi-Johnson Controls Air Conditioning, Inc. Klimaanlage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102449408B (zh) * 2009-05-29 2014-07-30 大金工业株式会社 空调装置
JP5366768B2 (ja) * 2009-11-18 2013-12-11 ダイキン工業株式会社 空気調和機の室外機
JP5257462B2 (ja) * 2011-01-11 2013-08-07 ダイキン工業株式会社 空気調和装置
WO2024069705A1 (ja) * 2022-09-26 2024-04-04 三菱電機株式会社 電力変換装置、モータ駆動装置および冷凍サイクル適用機器

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EP2012078A4 (de) 2009-11-18
AU2007232984A1 (en) 2007-10-11
JP4270274B2 (ja) 2009-05-27
WO2007114243A1 (ja) 2007-10-11
JP2007292439A (ja) 2007-11-08

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