EP1055885A2 - Klimaanlage - Google Patents

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Publication number
EP1055885A2
EP1055885A2 EP00110895A EP00110895A EP1055885A2 EP 1055885 A2 EP1055885 A2 EP 1055885A2 EP 00110895 A EP00110895 A EP 00110895A EP 00110895 A EP00110895 A EP 00110895A EP 1055885 A2 EP1055885 A2 EP 1055885A2
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EP
European Patent Office
Prior art keywords
temperature
compressor
defrosting
air conditioner
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.)
Granted
Application number
EP00110895A
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English (en)
French (fr)
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EP1055885A3 (de
EP1055885B1 (de
Inventor
Etsuo Shibata
Mamoru Kontani
Hirokuni Ikeda
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Sharp Corp
Original Assignee
Sharp Corp
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Filing date
Publication date
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Publication of EP1055885A2 publication Critical patent/EP1055885A2/de
Publication of EP1055885A3 publication Critical patent/EP1055885A3/de
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Publication of EP1055885B1 publication Critical patent/EP1055885B1/de
Anticipated expiration legal-status Critical
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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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • 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
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • 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
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control

Definitions

  • the present invention relates to an air conditioner. More specifically, the present invention relates to an air conditioner having a heating function ensuring room temperature stabilized near a set temperature.
  • the amount of air passing through the unit reduces, lowering efficiency of heat transfer, and therefore the evaporation temperature further lowers. This further promotes frosting of the heat exchanger of the outdoor unit. This causes decreased heating capability. Therefore, it is necessary to detect frosting and to defrost appropriately.
  • the refrigerant which should be turned to gas as it passes through the outdoor heat exchanger proceeds to the compressor in the form of the liquid. Therefore, liquid is accumulated at the accumulator, and the gas phase refrigerant only is absorbed by the compressor. If the liquid refrigerant exceeds the capacity of the accumulator, the liquid refrigerant goes to the compressor, possibly resulting in liquid compression, which may damage the compressor.
  • an air conditioner generally includes a defrosting determining circuit detecting whether a heat exchanger of an outdoor unit is frosted or not, and the air conditioner has a function of defrosting operation for defrosting the heat exchanger of the outdoor unit, if it is determined by the defrosting determining circuit that defrosting is necessary.
  • defrosting operation when the heat exchanger of the outdoor unit is not frosted that is, a so-called idle defrosting operation
  • whether defrosting is necessary or not is determined using various factors including temperatures of the heat exchangers of the indoor unit and the outdoor unit, the outdoor air temperature, an duration of operation. As to the temperature of the heat exchanger of the outdoor unit, the temperature is monitored over at least 6 minutes after the start of operation of a compressor, so as to improve accuracy in determining the necessity of defrosting.
  • Non-inverter type air conditioners in which capability of compressing of a compressor is made constant, and inverter type air conditioners in which the capability of the compressor is variable have been proposed.
  • a non-inverter type air conditioner when the room temperature attains close to a set temperature after the start of heating operation, the capability of heating is adjusted by intermittent operation of the compressor, so that the room temperature is stabilized near the set temperature.
  • the time of operation and the time of rest of the compressing function in the intermittent operation should be short to make the room temperature stable.
  • an electronic control circuit is not provided on the outdoor unit, but on the indoor unit. Therefore, if the temperature of the outdoor heat exchanger is to be measured for determining the necessity of defrosting, for example, interconnection between the indoor and the outdoor units becomes complicated. Accordingly, the measurement is not performed, and necessity of defrosting is determined by measuring the temperature of the indoor heat exchanger.
  • the operation is switched to the defrosting operation.
  • the capability of heating is adjusted by reducing driving power (driving energy: driving power supply frequency ⁇ voltage) supplied to the compressor, so as to stabilize the room temperature near the set temperature, and thus the room temperature is controlled to be stable around the set temperature.
  • driving energy driving power supply frequency ⁇ voltage
  • the intermittent operation of the compressor takes place in the similar manner as in the non-inverter type air conditioner, so that the room temperature is adjusted to the set temperature. Namely, the intermittent operation of the compressor is performed to keep the room temperature stabilized near the set temperature in the inverter type air conditioner as well. In this intermittent operation, highly accurate determination of the necessity of the defrosting is impossible, as described above. Therefore, here again, the problem of idle defrosting operation or failure of defrosting operation when needed exists.
  • an electronic control circuit is provided in the outdoor unit for controlling power supply to the compressor (power supply frequency ⁇ voltage). Therefore, the temperature of the outdoor heat exchanger and the temperature of the outside air are measured, and if the temperature of the outdoor heat exchanger is not higher than the outdoor temperature by a prescribed value, it is determined that defrosting operation is necessary.
  • the temperature of the outdoor heat exchanger it is a prerequisite condition that a prescribed time period has passed from the start of operation of the compressor so that the temperature of the heat exchanger dependent on the refrigerant is made stable.
  • an object of the present invention is to provide an air conditioner capable of determining whether a heat exchanger of an outdoor unit is frosted or not with high accuracy, preventing idle defrosting operation, and improving heating efficiency by surely performing defrosting operation when necessary.
  • a first heat exchanger is provided indoors
  • a second heat exchanger is provided outdoors
  • the room temperature is detected by a room temperature detecting circuit and the room temperature is set by a temperature setting circuit.
  • a refrigerant is circulated through the first and second heat exchangers by means of a compressor, and defrosting means performs defrosting operation to remove frost on the second heat exchanger.
  • Power supply to the compressor is controlled based on the detected room temperature and the set temperature, and the power supplied to the compressor is increased temporarily at a prescribed timing.
  • the power supplied to the compressor is increased temporarily at a predetermined timing, and therefore, determination as to whether defrosting of the second heat exchanger is necessary or not in that period can be performed with high accuracy.
  • whether defrosting is necessary or not is determined when the driving power is changed, and if it is determined that defrosting is necessary, defrosting is done by the defrosting means.
  • intermittent operation is performed in which the compressor is operated continuously until the detected temperature attains close to the set temperature and driving and rest of the compressor are repeated as the temperature attains nearer, and at a predetermined timing, the driving time of the compressor in the intermittent operation is changed to a pre-set time, regardless of the set temperature and the temperature detected during the intermittent operation.
  • the driving time is changed when a prescribed time has passed from the start of the intermittent operation.
  • the driving time is changed when the number of repetition of the driving and rest of the compressor attains a predetermined number.
  • the intermittent operation with the driving time changed is repeated for a predetermined number of times, and intermittent operation based on the detected temperature and the set temperature is resumed.
  • outdoor air temperature detecting means for detecting outdoor air temperature is provided, and when the detected outdoor air temperature is not lower than a predetermined temperature, change in the driving time is inhibited.
  • the magnitude of power supplied to the compressor is changed when a predetermined time period has passed from the start of operation of the compressor.
  • outdoor air temperature is detected, and when the detected outdoor temperature is not lower than a predetermined temperature, change in the magnitude of the driving power is inhibited.
  • the compressor is driven by an induction motor or a DC motor.
  • the magnitude of power supplied to the compressor is changed by adjusting frequency and voltage of the driving power supply, and when driven with the DC motor, the voltage or on/off duty ratio of the driving voltage is changed.
  • the air conditioner shown in Fig. 1 is of the non-inverter type, including an outdoor unit A and an indoor unit B.
  • Outdoor unit A is provided with a compressor 1, a four way switching valve 2, a decompressor 4, an outdoor heat exchanger 5 and an outdoor blower 8.
  • Indoor unit B is provided with an indoor heat exchanger 3, an indoor air temperature sensor 6 and an indoor blower 7.
  • Indoor unit B is connected to the mains, and power is supplied to the indoor unit A through an indoor ⁇ outdoor interconnection.
  • current consumption at compressor 1 is detected by current detecting means 9.
  • a thermistor for temperature detection, a control circuit and the like are provided on the outdoor unit A for measuring the temperature of the outdoor heat exchanger.
  • a refrigerating cycle is formed by successively linking compressor 1, four way switching valve 2, indoor heat exchanger 3, decompressor 4 and outdoor heat exchanger 5.
  • the refrigerant from compressor 1 is switched by four way switching valve 2, and at the time of cooling operation, the refrigerant from compressor 1 is condensed by outdoor heat exchanger 5, radiated to the atmosphere, the refrigerant is expanded through decompressor 4 and indoor heat exchanger 3 so that the air in the room is cooled, and the refrigerant is returned to the compressor 1 through the four way switching valve 2, as shown by the solid arrows in Fig. 1.
  • the refrigerant from compressor 1 is condensed by indoor heat exchanger 3 and the air in the room is heated, the refrigerant is expanded and evaporated through decompressor 4 and outdoor heat exchanger 5, heat is supplied from the outdoor air, and the refrigerant returns to the compressor 1 through four way switching valve 2, as shown by dotted arrows in Fig. 1.
  • Fig. 2 is a block diagram of a control circuit in accordance with one embodiment of the present invention.
  • the control circuit includes a control unit 10 for the indoor unit B and a control unit 20 for the outdoor unit A.
  • Control units 10 and 20 are implemented by a microprocessor, for example.
  • To control unit 10 an output of a room temperature detecting circuit 11 and an output of a room temperature setting circuit 12 are applied.
  • an output of a current detecting circuit 21 an output of a circuit 25 for detecting the temperature of the outdoor heat exchanger and on output of a circuit for detecting outdoor temperature are provided.
  • Control unit 10 applies a control signal to a switching element 13 for the indoor blower
  • control unit 20 applies control signals to a four way switching valve relay 22, an indoor blower relay 23, and a compressor relay 24, respectively.
  • Temperature detecting circuit 11 detects room temperature based on an output of room temperature sensor 6, shown in Fig. 1 and applies the detected output to control unit 10. Temperature setting circuit 12 sets the indoor temperature. Control unit 10 determines the difference between the detection output from room temperature detecting circuit 11 and the set temperature set by temperature setting circuit 12, and outputs a determination signal to control unit 20.
  • Current detecting circuit 21 detects current consumption based on an output of current detecting means 9 provided in outdoor unit A shown in Fig. 1, and applies it to control unit 20.
  • the circuit 25 for detecting the temperature of the outdoor heat exchanger detects the temperature of the outdoor heat exchanger 5 shown in Fig. 1, and the circuit 26 for detecting the outdoor temperature detects the outdoor temperature.
  • whether outdoor heat exchanger 5 is frosted or not is determined.
  • the defrosting operation is performed by switching the four-way valve to the cooling cycle, and causing hot gas from compressor 1 to flow to outdoor heat exchanger 5, that is, the so called reverse defrosting.
  • Control unit 10 controls indoor blower 7 through switching element 13 for the indoor blower
  • control unit 20 controls four-way valve 2 through four-way valve relay 22, controls outdoor blower 8 through outdoor blower relay 23, and controls compressor 1 through compressor relay 24.
  • Fig. 3 is a flow chart representing a specific operation of one embodiment of the present invention
  • Fig. 4 relates to the defrosting operation
  • Fig. 5 shows operation cycles in the intermittent operation of the compressor
  • Fig. 6 shows the state of operation in the heating operation of the air conditioner.
  • control unit 10 determines the room temperature based on the detection output of room temperature detecting circuit 11 shown in Fig. 2.
  • Control unit 10 applies a control signal to control unit 20 based on the difference between the set temperature set by temperature setting circuit 12 and the temperature detected by room temperature sensor 6, and control unit 20 controls compressor 1.
  • compressor operates continuously until the measured temperature exceeds the set temperature + 4°C, as shown in Fig.6, and when the room temperature increases and exceeds the set temperature + 4°C, the compressor is switched to the first intermittent operation mode in which three minutes of operation/three minutes of rest is repeated. When the room temperature further increases and exceeds the set temperature + 6°C, the compressor is switched to the second intermittent operation mode in which three minutes of operation/eight minutes of rest is repeated. When the room temperature further increases and exceeds the set temperature + 9°C, the operation of the compressor 1 is stopped. In such cycles of heating operation, the defrosting operation, which will be described in the following, takes place.
  • the flow chart of Fig. 3 schematically shows the defrosting operation in a certain cycle during the heating operation.
  • Control units 10 and 20 repeat the operations of steps SP2 and SP3 so as to operate compressor 1 continuously, whereby room temperature increases.
  • control unit 20 switches compressor 1 to first intermittent operation mode in which the compressor 1 is operated repeatedly in the cycle of three minutes of operation/three minutes of rest, by means of compressor relay 24.
  • Control unit 20 determines in step SP5 whether the first intermittent operation mode is repeated ten times or not. By repeating the operations of steps SP4 and SP5, compressor 1 repeats three minutes of operation and three minutes of rest repeatedly for ten times, as shown in Fig. 5, when the measured room temperature is +4°C to +6°C higher than the set temperature.
  • the room temperature is constantly detected, and the operation mode (continuous operation ⁇ intermittent operation ⁇ rest) is switched based on the relation with the set temperature, as represented in Fig. 6.
  • step SP5 when control unit 20 determines that the first intermittent operation mode of three minutes of operation and three minutes of rest is repeated ten times under condition of the set temperature and the detected temperature (Fig. 6), compressor relay 24 is turned on, so as to temporarily perform intermittent operation in which the operation time of compressor 1 is extended to five minutes in step SP6. More specifically, it is not possible to determine whether defrosting is necessary or not with high accuracy in the intermittent operation of three minutes of operation and three minutes of rest, as described above. Therefore, after ten times of intermittent operation of three minutes of operation and three minutes of rest of the compressor 1, the operation time of compressor 1 is extended automatically to five minutes.
  • control unit 20 determines whether defrosting is necessary or not in step 7, near the end of the on time of five minutes. Further, by repeating twice the intermittent operation with the operation time of compressor 1 extended to five minutes, the following becomes possible. Namely, when the state of the outdoor heat exchanger 5 is in such a state that almost or about to require defrosting, the amount of frost on the outdoor heat exchanger 5 increases, and outdoor heat exchanger 5 quickly enters the state which requires defrosting. Determination as to whether defrosting is necessary or not is made based on whether the temperature of outdoor heat exchanger 5 and the outdoor air temperature are in the predetermined area requiring defrosting, as shown in Fig. 4.
  • the problem here is that the operation time of compressor 1 in the continuous operation is three minutes.
  • the temperature of the outdoor heat exchanger is always measured during operation provided that accumulated operation time of compressor 1 exceeds 20 minutes (the accumulation time is cleared in the defrosting operation).
  • the temperature of the outdoor heat exchanger is not stable. Accordingly, when the temperature of the outdoor heat exchanger after four minutes from the start of operation of compressor 1 is kept for two minutes within the area requiring defrosting shown in Fig.4, which is determined by the outdoor temperature and the temperature of the outdoor heat exchanger, it is determined that defrosting is necessary.
  • the operation time of the compressor is five minutes, and hence, when the temperature of the outdoor heat exchanger after three minutes from the start of operation of compressor is kept for two minutes within the area requiring defrosting, it is determined that defrosting is necessary.
  • defrosting operation is performed in step SP8.
  • outdoor heat exchanger 5 serves as an evaporator.
  • the outdoor air temperature lowers and the evaporating temperature lowers, water in the air turns to water drop when it is in contact with an object of which temperature is not higher than the dew point.
  • the evaporator in the heating operation would be -5°C to -10°C, and the water in the air in contact with outdoor heat exchanger 5 frosts on the surface, thus outdoor heat exchanger 5 is frosted.
  • the reverse cycle takes place. More specifically, during heating operation, the operation cycle is temporarily switched to a refrigerating cycle, so that outdoor heat exchanger 5 is used as a condenser to radiate heat, and thus the frost is eliminated.
  • the two operations with the operation time of compressor 1 extended to five minutes it is possible to reduce the operation time with the outdoor heat exchanger 5 being in the state about to require defrosting, and hence efficiency of heating by the air conditioner is improved. This reduces running cost of the whole apparatus (reduction in power consumption), and in addition, provides the effect of preventing green house effect (reduction of CO 2 exhaustion amount).
  • control unit 20 When the intermittent operation with the operation time of compressor 1 extended to five minutes is repeated twice in steps SP6 and SP14, control unit 20 performs the original intermittent operation with the operation time of compressor 1 returned to three minutes, the intermittent operation with the operation time of compressor 1 being three minutes is repeated ten times, thereafter the intermittent operation with the operation time of compressor 1 extended to five minutes is again repeated twice, and determination as to whether defrosting of outdoor heat exchanger 5 is necessary or not is made in steps SP7 and SP15.
  • control unit 20 inhibits the intermittent operation with the operation time of compressor 1 extended to five minutes.
  • outdoor heat exchanger 5 is almost free from frost, and hence defrosting operation is unnecessary. Therefore, it is unnecessary to determine whether defrosting is necessary with the operation time of compressor 1 extended to five minutes. Therefore, the operation time of compressor 1 is not extended to five minutes, and the room temperature is stabilized near the set temperature by the normal three minutes of intermittent operation of the compressor 1.
  • control unit 10 operates the compressor 1, of which operation has been stopped, in the second intermittent operation mode of three minutes of operation/eight minutes of rest, in step SP12. If the temperature detected by temperature sensor 9 lowers and the detected temperature becomes lower than set temperature +6°C even in the second intermittent operation mode, control unit 10 switches the operation mode of compressor 1 to the first intermittent operation mode in which the compressor is repeatedly operated with three minutes of operation/three minutes of rest. If the temperature detected by temperature sensor 6 still lowers in the first intermittent operation mode and the detected temperature becomes lower than set temperature +3°C, control unit 10 switches the operation mode to continuous operation mode in which compressor 1 is operated continuously, in step SP3.
  • control unit 10 switches the operation mode of compressor 1 based on the difference between the set temperature and the temperature detected by temperature sensor 6 to adjust the heating capability, so that the room temperature can be adjusted to be stable near the set temperature.
  • control unit 10 controls power supply to compressor 1 in accordance with the temperature detected by indoor temperature sensor 6 in the above described embodiment, the timing for switching the intermittent operation with the operation time of compressor 1 extended to five minutes may be switched dependent on the output of the circuit 26 for detecting the outdoor temperature. More specifically, the number of repetition of the intermittent operation of compressor 1, which determines the timing of intermittent operation with the operation time of compressor 1 extended to five minutes, may be reduced as the outdoor temperature becomes lower.
  • the intermittent operation with the operation time of compressor 1 extended to five minutes takes place after the operation/rest of compressor 1 is repeated ten times.
  • the intermittent operation with the operation time of compressor 1 extended to five minutes may be performed after the operation/rest of compressor 1 is repeated five times. More specifically, when it is more likely that heat exchanger 1 is frosted, the cycle for determining the necessity of the defrosting is made shorter, so that the operation time with the heat exchanger being in the state requiring defrosting can be reduced.
  • the temperature detected by temperature sensor 6 may possibly increase before the three minutes operation/three minutes of rest of compressor 1 is repeated ten times, and the operation mode is switched to the second intermittent operation mode.
  • the intermittent operation with the operation time of the compressor extended to five minutes may be performed when three minutes of operation/eight minutes of rest of compressor 1 in the second intermittent operation mode is repeated ten times.
  • the intermittent operation with the operation time of compressor 1 extended to five minutes may be performed when the total of the intermittent operations of compressor 1 in the first and second intermittent operation modes reaches ten times.
  • the rest time of compressor 1 may be extended from three to five or eight minutes, for example, so that the room temperature is kept stable also in the rest time of compressor 1.
  • Fig. 7 is a block diagram representing a configuration of an air conditioner in accordance with another embodiment of the present invention.
  • the present invention has been applied to a non-inverter type air conditioner.
  • the embodiment shown in Fig. 7 represents the present invention applied to an inverter type air conditioner.
  • control unit 10 for indoor unit B, room temperature detecting circuit 11, room temperature setting circuit 12, switching element 14 for the indoor blower, control unit 20 for the outdoor unit A, current detecting circuit 21, the circuit 25 for detecting the temperature of the outdoor heat exchanger, the circuit 26 for detecting outdoor temperature, four-way switching valve relay 22 and outdoor blower relay 23 are of the same configurations as those shown in Fig. 2.
  • a power supply control unit 30 As the air conditioner is of the inverter type, a power supply control unit 30, a rectifier circuit 17, a booster circuit 18 and an inverter 19 are additionally provided. Power supply control unit 30 controls conversion from DC to AC voltage at the booster circuit 18 and inverter 19, based on a control signal from control unit 20.
  • Rectifier circuit 17 rectifies the AC power (mains) to a DC voltage, which is applied to booster circuit 18.
  • Booster circuit 18 boosts the rectified DC voltage
  • inverter 19 converts the boosted DC voltage to an AC signal, and supplies the signal to the motor coil of compressor 1.
  • Fig. 8 is an illustration related to the defrosting operation in accordance with this another embodiment of the present invention
  • Fig. 9 shows the state of operations in the heating operation of the air conditioner in accordance with this embodiment of the present invention.
  • the number of rotation of compressor 1 is controlled in accordance with temperature difference between the set temperature and the temperature detected by temperature sensor 6. More specifically, as the difference between the set temperature and the temperature detected by temperature sensor 9 increases as shown in Fig. 9, control unit 20 controls power supply control unit 30 so that the frequency from inverter 19 gradually lowers. As the frequency generated from inverter 19 lowers gradually, the number of rotation of compressor 1 becomes smaller from F6 ⁇ F5 ⁇ F4 ⁇ F3 ⁇ F2 ⁇ F1 (F6 > F5 > F4 > F3 > F2 > F1).
  • the number of rotation of compressor 1 is set to F6.
  • the number of rotation is set to F5.
  • the number of rotation of compressor 1 is set to F1, and the operation is continued.
  • the first intermittent operation of three minutes of operation and three minutes of rest is performed.
  • the number of rotation of compressor 1 is set to F1 and the second intermittent operation with three minutes of operation and eight minutes of rest is performed.
  • the second intermittent operation is repeated four times or when the detected temperature becomes not lower than set temperature +6°C, the operation of compressor 1 is stopped.
  • the intermittent operation with the operation time of compressor 1 extended to five minutes is repeated twice.
  • the operation time of compressor 1 is extended to five minutes, whether defrosting of outdoor heat exchanger 5 is necessary or not is determined. If necessary, defrosting operation is performed.
  • the air conditioner is of the inverter type. Therefore, the area requiring defrosting operation differs dependent on whether the frequency generated from inverter 19 is in a low frequency band or a high frequency band.
  • control unit 20 performs the defrosting operation dependent on whether the relation between the outdoor air temperature and the temperature of outdoor heat exchanger 5 is within the area requiring defrosting, determined by the frequency generated by inverter 19 as shown in Fig. 8.
  • the defrosting area a is when the driving power supply frequency of compressor 1 is low
  • defrosting area b is when the driving power supply frequency of compressor 1 is high.
  • necessity of defrosting of outdoor heat exchanger 5 is determined in the intermittent operation with the operation time of compressor 1 extended to five minutes. Therefore, as in the non-inverter type air conditioner, determination as to whether defrosting of outdoor heat exchanger 5 is necessary or not can be done with high accuracy.
  • driving power supplied to compressor 1 is temporarily increased at every prescribed time period even in the continuous operation of compressor 1, so as to temporarily increase the heating capability and to increase the amount of frost adhered on outdoor heat exchange unit.
  • compressor 1 may be continuously operated for 40 minutes with the driving frequency F1 and compressor 1 is operated with the number of operation F3 only for five minutes. Therefore, if the heat exchanger 5 is in such a state that almost requires defrosting, the heat exchanger immediately attains to the state requiring defrosting. Therefore, the operation time with the heat exchanger 5 being in the state almost requiring defrosting is made shorter, and operation efficiency of the air conditioner can be improved. This reduces running cost of the air conditioner as a whole, and further, it provides the effect of preventing green house effect (reduction of CO 2 exhaustion amount).
  • An induction motor or a DC motor may be used for compressor 1.
  • Inverter 19 supplying power to the motor coil of compressor 1 from the DC power rectified by rectifier circuit 17 for each case will be described in the following.
  • the driving frequency to be supplied to compressor 1 should be increased, and the pulse width of PWM (Pulse Width Modulation) control by inverter 19 should be increased, so that the driving voltage supplied to power compressor 1 is made higher and the driving current is increased, resulting in higher driving power. Namely, the driving frequency and the driving voltage are increased by the so-called PWM control of the inverter.
  • PWM Pulse Width Modulation
  • the PWM control and the PAM control in the inverter are well known techniques described, for example, in Japanese Patent Laying-Open Nos. 59-181973 and 6-105563. Therefore, detailed description thereof is not given here.
  • determination as to whether defrosting is necessary or not can be made with high accuracy. Therefore, the reference for determining necessity of defrosting can be set exactly, and hence possibility of idle defrosting operation can be reduced.
  • the operation time of the compressor is set longer at a prescribed timing, and hence determination as to whether defrosting of heat exchanger is necessary or not can be made with accuracy even in the intermittent operation.
  • the exchanger can be set quickly to the state which requires defrosting. Therefore, the operation time with the heat exchanger in the state almost requiring defrosting can be made shorter, and operation efficiency of the air conditioner can be improved. Further, as the determination of the necessity of defrosting can be made with high accuracy, the reference for determining necessity of defrosting can be set exactly, and hence possibility of idle defrosting can further be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
EP00110895A 1999-05-25 2000-05-23 Klimaanlage Expired - Lifetime EP1055885B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14523199A JP3609286B2 (ja) 1999-05-25 1999-05-25 空調機器
JP14523199 1999-05-25

Publications (3)

Publication Number Publication Date
EP1055885A2 true EP1055885A2 (de) 2000-11-29
EP1055885A3 EP1055885A3 (de) 2002-04-03
EP1055885B1 EP1055885B1 (de) 2006-03-29

Family

ID=15380381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00110895A Expired - Lifetime EP1055885B1 (de) 1999-05-25 2000-05-23 Klimaanlage

Country Status (6)

Country Link
EP (1) EP1055885B1 (de)
JP (1) JP3609286B2 (de)
CN (1) CN1135336C (de)
AU (1) AU768701B2 (de)
DE (1) DE60026898T2 (de)
ES (1) ES2259955T3 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7075268B2 (en) 2004-02-27 2006-07-11 York International Corporation System and method for increasing output horsepower and efficiency in a motor
US7096681B2 (en) 2004-02-27 2006-08-29 York International Corporation System and method for variable speed operation of a screw compressor
US7164242B2 (en) 2004-02-27 2007-01-16 York International Corp. Variable speed drive for multiple loads
US7193826B2 (en) 2004-02-27 2007-03-20 York International Corporation Motor disconnect arrangement for a variable speed drive
US9182134B2 (en) 2009-11-26 2015-11-10 Sharp Kabushiki Kaisha Air conditioner having positive temperature coefficient heater
WO2017037747A1 (en) * 2015-09-04 2017-03-09 Thermocold Costruzioni Srl Control method for defrosting the outdoor coil of a heat pump machine

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7856836B2 (en) * 2005-07-26 2010-12-28 Mitsubishi Electric Corporation Refrigerating air conditioning system
JP2012052683A (ja) * 2010-08-31 2012-03-15 Panasonic Corp 空調制御装置
DK2757335T3 (en) * 2011-09-14 2018-11-12 Hefei Midea Refrigerator Co Refrigerator with defrost and control method
CN102297549B (zh) * 2011-09-15 2013-06-12 青岛海信日立空调系统有限公司 空调的除霜方法
JP2015087076A (ja) * 2013-10-31 2015-05-07 株式会社富士通ゼネラル 空気調和機
CN105650801B (zh) * 2014-12-08 2019-04-16 Tcl空调器(中山)有限公司 控制空调进入除霜模式的方法、装置及空调器
CN107014035B (zh) * 2017-03-29 2020-07-07 青岛海尔空调电子有限公司 空调器的除霜控制方法及装置
CN112781179A (zh) * 2020-12-24 2021-05-11 珠海格力电器股份有限公司 空调除霜控制方法、控制系统和空调器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59181973A (ja) 1983-03-31 1984-10-16 Toshiba Corp 電力変換器の制御方式
JPS60105563A (ja) 1983-11-14 1985-06-11 Fujitsu Ltd 媒体搬送装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57184859A (en) * 1981-05-08 1982-11-13 Hitachi Ltd Method of controlling heating operation of heat pump type air conditioner
JPS62255762A (ja) * 1986-04-30 1987-11-07 株式会社日立製作所 空気調和機
US5257506A (en) * 1991-03-22 1993-11-02 Carrier Corporation Defrost control
JPH07120121A (ja) * 1993-10-29 1995-05-12 Daikin Ind Ltd 空気調和装置の運転制御装置
JP3495858B2 (ja) * 1996-10-31 2004-02-09 東芝キヤリア株式会社 空気調和機
KR100225640B1 (ko) * 1997-06-27 1999-10-15 윤종용 공기조화기의 제상제어방법

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59181973A (ja) 1983-03-31 1984-10-16 Toshiba Corp 電力変換器の制御方式
JPS60105563A (ja) 1983-11-14 1985-06-11 Fujitsu Ltd 媒体搬送装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7075268B2 (en) 2004-02-27 2006-07-11 York International Corporation System and method for increasing output horsepower and efficiency in a motor
US7096681B2 (en) 2004-02-27 2006-08-29 York International Corporation System and method for variable speed operation of a screw compressor
US7164242B2 (en) 2004-02-27 2007-01-16 York International Corp. Variable speed drive for multiple loads
US7193826B2 (en) 2004-02-27 2007-03-20 York International Corporation Motor disconnect arrangement for a variable speed drive
US9182134B2 (en) 2009-11-26 2015-11-10 Sharp Kabushiki Kaisha Air conditioner having positive temperature coefficient heater
WO2017037747A1 (en) * 2015-09-04 2017-03-09 Thermocold Costruzioni Srl Control method for defrosting the outdoor coil of a heat pump machine
US10591195B2 (en) 2015-09-04 2020-03-17 Ingersoll-Rand International Ltd Control method for defrosting the outdoor coil of a heat pump machine

Also Published As

Publication number Publication date
DE60026898T2 (de) 2007-03-15
CN1135336C (zh) 2004-01-21
EP1055885A3 (de) 2002-04-03
JP2000337682A (ja) 2000-12-08
JP3609286B2 (ja) 2005-01-12
DE60026898D1 (de) 2006-05-18
AU768701B2 (en) 2004-01-08
CN1275698A (zh) 2000-12-06
EP1055885B1 (de) 2006-03-29
ES2259955T3 (es) 2006-11-01
AU3634900A (en) 2000-11-30

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