WO2017030068A1 - 冷凍装置 - Google Patents

冷凍装置 Download PDF

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Publication number
WO2017030068A1
WO2017030068A1 PCT/JP2016/073565 JP2016073565W WO2017030068A1 WO 2017030068 A1 WO2017030068 A1 WO 2017030068A1 JP 2016073565 W JP2016073565 W JP 2016073565W WO 2017030068 A1 WO2017030068 A1 WO 2017030068A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
temperature
outdoor heat
outdoor
indoor
Prior art date
Application number
PCT/JP2016/073565
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English (en)
French (fr)
Japanese (ja)
Inventor
貴裕 仲田
Original Assignee
ダイキン工業株式会社
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 ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to BR112018001930-5A priority Critical patent/BR112018001930A2/pt
Priority to EP16837058.3A priority patent/EP3339761A4/en
Priority to AU2016309268A priority patent/AU2016309268A1/en
Priority to CN201680047774.7A priority patent/CN107923646B/zh
Priority to US15/753,310 priority patent/US20180238578A1/en
Publication of WO2017030068A1 publication Critical patent/WO2017030068A1/ja

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    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0071—Indoor units, e.g. fan coil units with means for purifying supplied air
    • F24F1/0073—Indoor units, e.g. fan coil units with means for purifying supplied air characterised by the mounting or arrangement of filters
    • 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
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • F24F11/89—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
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside 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
    • F25B2700/11—Sensor to detect if defrost is necessary
    • 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
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21161—Temperatures of a condenser of the fluid heated by the condenser
    • 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
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator

Definitions

  • the present invention relates to a refrigeration apparatus including a refrigeration circuit.
  • a defrosting operation has been performed in order to remove frost attached to an outdoor heat exchanger.
  • Patent Document 1 Japanese Patent Laid-Open No. 9-243210
  • Patent Document 2 Japanese Patent Laid-Open No. 10-103818
  • a defrost operation for removing frost on the outdoor heat exchanger is started.
  • the indoor heat exchanger has entered a state where frost begins to be detected
  • the indoor heat exchanger temperature is not more than a predetermined value in addition to the condition that the temperature of the outdoor heat exchanger is not more than a predetermined value as a condition for performing defrosting.
  • the compressor operating frequency is lower than the specified value, or setting the outdoor heat exchanger temperature to enter the defrosting operation in consideration of the compressor operating frequency, the outside air temperature and the outside air humidity Has been done.
  • the empty defrosting that enters the defrost operation when the outdoor heat exchanger is not frosted. Is not enough to prevent. Air defrosting is, in other words, wrong defrosting.
  • the problem of the present invention is to prevent air defrosting that enters defrost operation when the outdoor heat exchanger is not frosted.
  • a refrigeration apparatus includes a refrigeration circuit capable of repeating a vapor compression refrigeration cycle by flowing a refrigerant in the order of a compressor, an indoor heat exchanger, an expansion mechanism, and an outdoor heat exchanger, and an indoor heat
  • a first sensor capable of detecting the temperature of the indoor heat exchanger of the exchanger and a second sensor capable of detecting the temperature of the outdoor heat exchanger of the outdoor heat exchanger; In addition to the first necessary condition that the state detected by one sensor continues for the first set time, the state in which a continuous decrease in the outdoor heat exchanger temperature is detected by the second sensor continues for the second set time. 2 It is configured to enter a defrost operation for defrosting the outdoor heat exchanger when the necessary conditions are satisfied.
  • the state in which the continuous decrease in the indoor heat exchanger temperature is detected by the first sensor is not only the first necessary condition for continuing the first set time, but the continuation of the outdoor heat exchanger temperature by the second sensor. Since the second necessary condition in which the state where the lowering is detected is continued for the second set time is set as the condition for entering the defrost operation, the indoor heat exchanger is not used for reasons other than frost formation on the outdoor heat exchanger. The case where the temperature of the outdoor heat exchanger rises because the temperature is decreasing but the outdoor heat exchanger is not frosted can be excluded from the case of entering the defrost operation.
  • the situation in which the average value of the outdoor heat exchanger temperature detected by the second sensor within the predetermined sampling time does not increase continues for a predetermined number of times. In this case, it is determined that the second necessary condition is satisfied.
  • a refrigeration apparatus is the refrigeration apparatus according to the first aspect, further comprising a third sensor capable of detecting an outside air temperature at a location where the outdoor heat exchanger is installed, and is detected by the second sensor. It is used as the third necessary condition that the outdoor heat exchanger temperature thus made is lower than the defrost entry temperature set according to the outdoor temperature detected by the third sensor and the operating frequency of the compressor, and the first necessary condition and The defrost operation is started when the second necessary condition and the third necessary condition are satisfied at the same time.
  • the outdoor heat exchanger temperature is lower than the defrost entry temperature set in accordance with the outside air temperature and the operating frequency of the compressor, it is used as a third necessary condition, and therefore, an environment in which frost formation occurs It is possible to determine whether or not to enter the defrost operation in consideration.
  • the third requirement is that the period during which the outdoor heat exchanger temperature is lower than the defrost entry temperature continues for a third set time. Is what is.
  • the defrost operation is not entered even if the first and second necessary conditions are satisfied.
  • the operation state of the compressor can be reflected in the determination of whether or not to enter the defrost operation.
  • the effect of preventing air defrosting is enhanced.
  • the perspective view which shows the external appearance of the air conditioner which concerns on embodiment.
  • the timing chart which shows the outline
  • the graph which shows an example of the time-dependent change of outdoor heat exchanger temperature.
  • operation The flowchart for demonstrating an example of the determination method which rushes into defrost driving
  • the graph which shows an example of the relationship of a time-dependent change of the temperature difference of indoor heat exchanger temperature and room temperature, and defrost entry determination.
  • the graph which shows the other example of the relationship between the time-dependent change of the temperature difference of indoor heat exchanger temperature and room temperature, and defrost entry determination.
  • FIG. 1 An air conditioner 1 shown in FIG. 1 includes an indoor unit 2 attached to an indoor wall surface WL and the like, and an outdoor unit 3 installed outdoors.
  • FIG. 2 is a circuit diagram of the air conditioner 1.
  • the air conditioner 1 includes a refrigeration circuit 10 and can perform a vapor compression refrigeration cycle by circulating a refrigerant in the refrigeration circuit 10.
  • the indoor unit 2 and the outdoor unit 3 are connected by a communication pipe 4.
  • Refrigeration circuit 10 The refrigeration circuit 10 includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an expansion mechanism 14, an accumulator 15, and an indoor heat exchanger 16.
  • the compressor 11 that sucks and compresses the refrigerant sucked from the suction port sends out the refrigerant discharged from the discharge port to the first port of the four-way switching valve 12.
  • the four-way switching valve 12 causes the refrigerant to flow between the first port and the fourth port and at the same time the second port and the third port, as indicated by broken lines. Allow refrigerant to flow between ports. Further, when the air conditioner 1 performs the cooling operation and the reverse cycle defrost operation, the four-way switching valve 12 circulates the refrigerant between the first port and the second port, as indicated by the solid line. At the same time, the refrigerant is circulated between the third port and the fourth port.
  • the outdoor heat exchanger 13 has a gas side inlet / outlet for mainly allowing the gas refrigerant to flow between the second port of the four-way switching valve 12 and allows the liquid refrigerant to mainly flow between the expansion mechanism 14. For the liquid side.
  • the outdoor heat exchanger 13 exchanges heat between the refrigerant flowing through a heat transfer tube (not shown) connected between the liquid side inlet and outlet and the gas side inlet and outlet of the outdoor heat exchanger 13 and the outdoor air.
  • the expansion mechanism 14 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16.
  • the expansion mechanism 14 has a function of expanding and depressurizing the refrigerant flowing between the outdoor heat exchanger 13 and the indoor heat exchanger 16.
  • the indoor heat exchanger 16 has a liquid side inlet / outlet for mainly circulating the liquid refrigerant to and from the expansion mechanism 14, and mainly distributes the gas refrigerant to and from the fourth port of the four-way switching valve 12. It has a gas side entrance and exit.
  • the indoor heat exchanger 16 exchanges heat between the refrigerant flowing through the heat transfer pipe 16a (see FIG. 3) connected between the liquid side inlet and outlet and the gas side inlet and outlet of the indoor heat exchanger 16 and the room air. .
  • An accumulator 15 is disposed between the third port of the four-way switching valve 12 and the suction port of the compressor 11.
  • the refrigerant flowing from the third port of the four-way switching valve 12 to the compressor 11 is separated into gas refrigerant and liquid refrigerant.
  • a gas refrigerant is mainly supplied from the accumulator 15 to the suction port of the compressor 11.
  • the outdoor unit 3 includes an outdoor fan 21 for generating an air flow of outdoor air that passes through the outdoor heat exchanger 13.
  • the outdoor unit 3 includes an outdoor temperature sensor 22 for measuring the temperature of the outdoor air, and an outdoor heat exchanger temperature sensor 23 for measuring the temperature of the outdoor heat exchanger 13.
  • the outdoor unit 3 includes an outdoor control device 24 that controls the compressor 11, the four-way switching valve 12, the expansion mechanism 14, and the outdoor fan 21.
  • the outdoor control device 24 includes, for example, a CPU (not shown) and a memory (not shown), and can control the outdoor unit 3 according to a stored program or the like.
  • the outdoor control device 24 is connected to the outdoor temperature sensor 22 and the outdoor heat exchanger temperature sensor 23 in order to receive signals related to the temperatures measured by the outdoor temperature sensor 22 and the outdoor heat exchanger temperature sensor 23. .
  • the indoor unit 2 includes an indoor fan 31 for generating a flow of indoor air that passes through the indoor heat exchanger 16.
  • the indoor unit 2 includes an indoor temperature sensor 32 for measuring the temperature of indoor air and an indoor heat exchanger temperature sensor 33 for measuring the temperature of the indoor heat exchanger 16.
  • the indoor unit 2 includes an indoor control device 34 that controls the indoor fan 31.
  • the indoor side control device 34 includes, for example, a CPU (not shown) and a memory (not shown), and is configured to be able to control the outdoor unit 3 according to a stored program or the like.
  • the indoor side control device 34 is connected to the indoor temperature sensor 32 and the indoor heat exchanger temperature sensor 33 in order to receive a signal related to the temperature measured by the indoor temperature sensor 32 and the indoor heat exchanger temperature sensor 33. .
  • outdoor side control device 24 and the indoor side control device 34 are connected to each other by a signal line so that signals can be transmitted and received with each other.
  • FIG. 3 shows a cross section of the indoor unit cut along the line II in FIG.
  • the indoor unit 2 includes a casing 41, an indoor heat exchanger 16, an indoor fan 31, an air filter 42, a horizontal flap 43, and a vertical flap 49.
  • An upper surface suction port 44 is provided on the upper surface of the casing 41.
  • the indoor air in the vicinity of the upper surface suction port 44 is taken into the casing 41 from the upper surface suction port 44 by the drive of the indoor fan 31 and sent to the indoor heat exchanger 16 having a reverse V-shaped cross section.
  • a broken-line arrow A in FIG. 3 represents the flow of indoor air sent from the upper surface inlet 44 to the indoor fan 31 via the indoor heat exchanger 16.
  • a lower surface suction port 45 and an air outlet 46 are formed on the lower surface of the casing 41.
  • the lower surface suction port 45 is provided on the wall side with respect to the air outlet 46, and is connected to the inside of the casing 41 by the suction channel 47. From the lower surface suction port 45, room air in the vicinity of the lower surface suction port 45 is taken into the casing 41 by driving the indoor fan 31, and is sent to the indoor heat exchanger 16 through the suction channel 47.
  • a broken-line arrow B in FIG. 3 represents the flow of indoor air sent from the lower surface suction port 45 to the indoor heat exchanger 16.
  • the air outlet 46 is provided on the front side of the indoor unit 2 with respect to the lower surface inlet 45, and is connected to the inside of the casing 41 by the air outlet channel 48.
  • the room air sucked from the upper surface suction port 44 and the lower surface suction port 45 is subjected to heat exchange in the indoor heat exchanger 16 and then blown out from the blower outlet 46 into the room through the blowout channel 48.
  • a broken-line arrow C in FIG. 3 represents the flow of air sent from the blowout channel 48 to the room through the blowout port 46.
  • two horizontal flaps 43 are attached to the casing 41 so as to be rotatable.
  • the horizontal flap 43 is rotated by a flap driving motor (not shown), and opens and closes the air outlet 46 according to the operating state of the indoor unit 2.
  • the horizontal flap 43 has a function of changing the blowing direction of the room air up and down so that the room air blown out from the blow-out port 46 is guided in the direction desired by the user.
  • a vertical flap 49 is attached to the casing 41 so as to be rotatable in the vicinity of the air outlet 46.
  • the vertical flap 49 has a function of rotating by a flap driving motor (not shown) and changing the blowing direction of room air to the left and right.
  • the low-temperature and high-pressure refrigerant deprived of the temperature by the indoor heat exchanger 16 is decompressed by the expansion mechanism 14 to be changed to a low-temperature and low-pressure refrigerant.
  • the refrigerant that has flowed into the outdoor heat exchanger 13 via the expansion mechanism 14 is warmed by heat exchange with the outdoor air, evaporates, and changes from liquid refrigerant to gas refrigerant.
  • the outdoor heat exchanger 13 functions as an evaporator.
  • refrigerant composed mainly of low-temperature gas refrigerant is sucked into the compressor 11 from the outdoor heat exchanger 13 through the four-way switching valve 12 and the accumulator 15.
  • the refrigerant is flowed in the order of the compressor 11, the indoor heat exchanger 16, the expansion mechanism 14, and the outdoor heat exchanger 13, and such a vapor compression refrigeration cycle is repeated.
  • the low-temperature and high-pressure refrigerant whose temperature has been deprived by the outdoor heat exchanger 13 is reduced in pressure by the expansion mechanism 14 and changed to a low-temperature and low-pressure refrigerant.
  • the refrigerant that has flowed into the indoor heat exchanger 16 through the expansion mechanism 14 cools the indoor air by heat exchange with the indoor air, is warmed, and evaporates to change from a liquid refrigerant to a gas refrigerant.
  • the indoor heat exchanger 16 functions as an evaporator.
  • the refrigerant mainly composed of low-temperature gas refrigerant is sucked into the compressor 11 from the indoor heat exchanger 16 through the four-way switching valve 12 and the accumulator 15.
  • the reverse cycle defrost operation is performed to remove frost attached to the outdoor heat exchanger 13 due to the heating operation. Accordingly, the operation is switched to the reverse cycle defrost operation in the middle of the heating operation, and when the reverse cycle defrost operation is completed, the operation returns to the heating operation again.
  • the reverse cycle defrost operation as in the cooling operation, the four-way switching valve 12 is switched to the solid line state shown in FIG. In the reverse cycle defrost operation, the same vapor compression refrigeration cycle as in the cooling operation is repeated.
  • the reverse cycle defrost operation is performed in the reverse cycle of the heating operation, and the vapor compression is performed by flowing the refrigerant in the order of the compressor 11, the outdoor heat exchanger 13, the expansion mechanism 14, and the indoor heat exchanger 16. It is the reverse cycle which repeats a formula refrigeration cycle.
  • the outdoor unit 3 determines that the outdoor side control device 24 performs defrosting when the heating control is being performed.
  • the defrost entry determination will be described later.
  • the defrost request signal SG ⁇ b> 1 is transmitted from the outdoor side control device 24 of the outdoor unit 3 to the indoor side control device 34 of the indoor unit 2.
  • the indoor side control device 34 receives the defrost request signal SG1
  • the indoor unit 2 starts preparation for the defrost operation. For example, in the case where an electric heater (not shown) for supplementing the indoor air is built in, the indoor control device 34 keeps the indoor fan 31 on for a while after the electric heater is turned off. When the is cooled, the preparation for the defrosting operation is completed.
  • the indoor side control device 34 transmits a defrost permission signal SG2 to the outdoor side control device 24.
  • the outdoor side control apparatus 24 will start defrost control, if the defrost permission signal SG2 is received, and will transmit the signal SG3 which shows being defrosting to the indoor side control apparatus 34.
  • the normal notification signal SG4 that notifies the outdoor side control device 24 to return to the normal heating operation to the indoor side control device 34 of the indoor unit 2 Is sent.
  • the indoor unit 2 that has received the normal notification signal SG4 returns to the heating control for the heating operation.
  • the outdoor side controller 24 monitors the outdoor heat exchanger temperature using the outdoor heat exchanger temperature sensor 23.
  • the outdoor control device 24 detects that the outdoor heat exchanger temperature has reached Ta ° C. due to the increase in the outdoor heat exchanger temperature after 90 seconds, the outdoor control device 24 terminates the reverse cycle defrost operation. decide.
  • the defrosting time required from the start of defrosting to the end of defrosting varies depending on the outside air temperature and the operating state of the air conditioner 1. In other words, the defrosting time may be longer or shorter.
  • the outdoor side control device 24 stores the threshold value tr, and determines whether the defrost time is longer or shorter than tr each time the reverse cycle defrost operation is performed.
  • the indoor side control device 34 of the indoor unit 2 measures the indoor heat exchanger temperature Tei of the indoor heat exchanger 16 using the indoor heat exchanger temperature sensor 33 (step ST1), and controls the outdoor side of the outdoor unit 3
  • the apparatus 24 measures the outdoor heat exchanger temperature Teo of the outdoor heat exchanger 13 using the outdoor heat exchanger temperature sensor 23 (step ST2).
  • FIG. 6 it is described that the measurement of the indoor heat exchanger temperature Tei is measured before the outdoor heat exchanger temperature Teo, but either of these measurements is performed first. Or may be performed simultaneously.
  • step ST3 it is determined whether or not the indoor heat exchanger temperature Tei is continuously decreased for the first set time (step ST3), and the outdoor heat exchanger temperature Teo is continuously decreased for the second set time. It is determined whether or not (step ST4).
  • the former is the determination of the first necessary condition
  • the latter is the determination of the second necessary condition.
  • the outdoor heat exchanger temperature Teo and the indoor heat exchanger temperature Tei are collected in one of the indoor side control device 34 and the outdoor side control device 24, and the outdoor heat exchanger temperature Teo and the indoor heat exchanger temperature are collected. It may be determined whether or not both the first necessary condition and the second necessary condition are satisfied by the control device having both data about Tei.
  • the measurement of the indoor heat exchanger temperature Tei and the outdoor heat exchanger temperature Teo is repeated until the above first and second necessary conditions are satisfied. If the above-mentioned first necessary condition and second necessary condition are satisfied, the air conditioner 1 determines to enter the defrost operation by the indoor side control device 34 or the outdoor side control device 24 (step ST5).
  • step ST4 the outdoor side control device 24 performs sampling n times at a fixed time using a built-in sampling timer, and calculates the average value ( ⁇ Teo / n) of the outdoor heat exchanger temperature Teo.
  • n is a predetermined natural number.
  • the indoor side control device 34 that has obtained information from the outside control device 24 or the outdoor side control device 24 determines that the outdoor heat exchanger temperature Teo continuously decreases for the second set time (step ST12).
  • step ST21 for calculating the defrost entry temperature from the outdoor heat exchanger temperature and the defrost entry temperature are used.
  • step ST22 for determining whether or not to enter the defrost operation is provided.
  • the outdoor side controller 24 measures the outdoor temperature Tout using the outdoor temperature sensor 22. Then, the outdoor side control device 24 determines whether the outside air temperature Tout is lower than the defrosting determination outside air temperature Tdd or higher than the defrosting determination outside air temperature Tdd. Further, as described in (3-1) above, the outdoor side control device 24 determines whether the previous defrost time tdf is longer or shorter than the threshold value tr. Depending on these situations, the defrost entry temperature Tp is calculated using one of the following four formulas (1) to (4).
  • f is the operating frequency of the compressor 11, and ⁇ , ⁇ 1, ⁇ 0, ⁇ 1, ⁇ 0, and ⁇ are positive constants.
  • Tp is set within a predetermined range.
  • the constants in the equations (1) to (4) are determined from the measurement results for the outdoor air temperature Tout and the operation frequency f for the outdoor heat exchanger temperature (defrost entry temperature Tp) to be entered into the defrost operation. .
  • Tp ⁇ ⁇ f + ⁇ 1 ⁇ Tout ⁇ 1 (1)
  • Tp ⁇ ⁇ f + ⁇ 0 ⁇ Tout ⁇ 0 (2)
  • Tp ⁇ ⁇ f + ⁇ 1 ⁇ Tout ⁇ 1 + ⁇ (3)
  • Tp ⁇ ⁇ f + ⁇ 0 ⁇ Tout ⁇ 0 + ⁇ (4)
  • the indoor control device 34 calculates an average value of the temperature difference ⁇ Tei sampled for a certain period of time. And the indoor side control apparatus 34 judges that the 1st necessary condition was satisfied when the average value of temperature difference (DELTA) Tei fell continuously k times. By making such a determination, it is possible to determine a continuous decrease in the indoor heat exchanger temperature Tei while considering the influence of the indoor temperature Tin.
  • DELTA temperature difference
  • the first condition for defrosting may be satisfied at point Q shown in FIG. Therefore, in the modified example C, as the first necessary condition is satisfied, the average value Av ⁇ Tei of the temperature difference ⁇ Tei continuously decreases k times, or the average value Av ⁇ Tei of the temperature difference ⁇ Tei is the first set time Ts1. It is not going to rise. In this case, even if the former condition is not satisfied, as shown in FIG. 10, the average value Av ⁇ Tei of the temperature difference ⁇ Tei does not increase and remains the same between time t31 and time t32. Or has fallen. As described above, the first necessary condition for defrosting is satisfied at a relatively early timing as compared with FIG. 9.
  • the first necessary condition for entering the defrost operation is that the indoor heat exchanger 16 has the indoor heat exchanger 16 by the indoor heat exchanger temperature sensor 33.
  • the state where the continuous decrease in the temperature Tei is detected is that the first set time continues.
  • the second necessary condition is that the state in which the outdoor heat exchanger temperature Teo of the outdoor heat exchanger 13 is continuously detected by the outdoor heat exchanger temperature sensor 23 is continued for the second set time.
  • the temperature sensor 33 for indoor heat exchangers is a 1st sensor
  • the temperature sensor 23 for outdoor heat exchangers is a 2nd sensor.
  • the average value of the outdoor heat exchanger temperature Teo of the outdoor heat exchanger 13 within a predetermined sampling time in other words, the average value of the outdoor heat exchanger temperature sampled a predetermined number n ( ⁇ Teo / n). Is used. As a result, it is possible to suppress an error in the determination that the second necessary condition is satisfied by the measurement noise of the outdoor heat exchanger temperature Teo, and to stably prevent the air defrosting from being performed.
  • the outdoor heat exchanger temperature Teo of the outdoor heat exchanger 13 is lower than the defrost entry temperature Tp set according to the outdoor air temperature Tout and the operating frequency f of the compressor 11. 3 Used as a necessary condition. By using such a third necessary condition, it is possible to determine whether or not to enter the defrost operation in consideration of the environment in which frost formation occurs, so that it is easy to prevent the air defrosting from being performed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)
  • Defrosting Systems (AREA)
PCT/JP2016/073565 2015-08-18 2016-08-10 冷凍装置 WO2017030068A1 (ja)

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BR112018001930-5A BR112018001930A2 (pt) 2015-08-18 2016-08-10 aparelho de refrigeração
EP16837058.3A EP3339761A4 (en) 2015-08-18 2016-08-10 Refrigeration device
AU2016309268A AU2016309268A1 (en) 2015-08-18 2016-08-10 Refrigeration device
CN201680047774.7A CN107923646B (zh) 2015-08-18 2016-08-10 冷冻装置
US15/753,310 US20180238578A1 (en) 2015-08-18 2016-08-10 Refrigeration apparatus

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JP2015161207A JP6119811B2 (ja) 2015-08-18 2015-08-18 冷凍装置

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CN112050372A (zh) * 2019-06-07 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050371A (zh) * 2019-06-07 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050367A (zh) * 2019-06-07 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
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CN110454916B (zh) * 2019-08-19 2022-03-25 广东美的制冷设备有限公司 空调器的化霜方法和空调器
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CN112050356A (zh) * 2019-06-06 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050356B (zh) * 2019-06-06 2022-08-19 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050373A (zh) * 2019-06-07 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050372A (zh) * 2019-06-07 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050371A (zh) * 2019-06-07 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050367A (zh) * 2019-06-07 2020-12-08 青岛海尔空调器有限总公司 一种用于空调除霜的控制方法、控制装置及空调
CN112050367B (zh) * 2019-06-07 2022-07-19 重庆海尔空调器有限公司 一种用于空调除霜的控制方法、控制装置及空调

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JP6119811B2 (ja) 2017-04-26
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AU2016309268A1 (en) 2018-04-19
CN107923646B (zh) 2019-02-01
EP3339761A1 (en) 2018-06-27
BR112018001930A2 (pt) 2018-09-25
US20180238578A1 (en) 2018-08-23

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