EP2565559B1 - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
EP2565559B1
EP2565559B1 EP12157794.4A EP12157794A EP2565559B1 EP 2565559 B1 EP2565559 B1 EP 2565559B1 EP 12157794 A EP12157794 A EP 12157794A EP 2565559 B1 EP2565559 B1 EP 2565559B1
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EP
European Patent Office
Prior art keywords
temperature
way valve
bypass
heat exchanger
indoor
Prior art date
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Application number
EP12157794.4A
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German (de)
English (en)
French (fr)
Other versions
EP2565559A2 (en
EP2565559A3 (en
Inventor
Satoru Kurata
Akira Iuchi
Noriaki Yamamoto
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.)
Panasonic Corp
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Panasonic Corp
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Publication of EP2565559A3 publication Critical patent/EP2565559A3/en
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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
    • F25B47/022—Defrosting cycles hot gas defrosting
    • 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
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0403—Refrigeration circuit bypassing means for 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/24—Storage receiver heat
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves

Definitions

  • the present invention relates to an air conditioner capable of improving user's comfort.
  • JP 2011-153736 A discloses a refrigerating cycle device in which the compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger are connected to each other by refrigerant piping.
  • the refrigerating cycle device is provided with a heat storage device having a heat storage material disposed in a state of surrounding the compressor and storing the heat generated in the compressor, and a heat storage heat exchanger exchanging heat between the heat stored in the heat storage material and the refrigerant.
  • the refrigerant from the indoor heat exchanger to the heat storage heat exchanger in a defrosting operation, and the refrigerant from the heat storage heat exchanger is joined with the refrigerant from the outdoor heat exchanger.
  • an object of the present invention is to provide an air conditioner capable of executing the heating operation while indoor users' comfort is maintained.
  • an air conditioner as defined in claim 1.
  • an air conditioner capable of executing the heating operation while indoor users' comfort is maintained.
  • a first invention provides an air conditioner comprising: a refrigerating cycle which comprises a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, and an outdoor heat exchanger and in which during heating operation a refrigerant flows in an order of the compressor, the four-way valve, the indoor heat exchanger, the pressure reducer, the outdoor heat exchanger, the four-way valve, and the compressor; an indoor temperature detection means for detecting an indoor temperature; and a target temperature setting means for setting a target temperature, wherein a specified compressor-stop condition is previously set, the specified compressor-stop condition is satisfied when a state, which the indoor temperature is higher than the target temperature by a specified temperature difference, has lasted for a specified duration time , and the compressor is stopped when, after the indoor temperature has exceeded the target temperature, the specified compressor-stop condition is satisfied, the air conditioner further comprising: a bypass circuit for connecting one point between the indoor heat exchanger and the pressure reducer and another point between the four-way valve and an inlet port of the compressor; and a
  • the refrigerant flowing from the compressor toward the indoor heat exchanger lowers in pressure, so that the temperature of the indoor heat exchanger can be lowered.
  • the specified compressor-stop condition becomes less likely to be satisfied, i.e., the compressor is less likely to be stopped, so that the indoor user's comfort can be maintained.
  • the air conditioner of the first invention further comprises a heat storage unit which is provided in the bypass circuit and which conducts exhaust heat of the compressor to the refrigerant.
  • the heating operation can be continued while the defrosting operation is performed securely, and moreover the thermo-off operation delay control is executed when the defrosting operation is less likely to be executed.
  • the heating operation can be executed while the user's comfort is maintained.
  • the air conditioner of the second invention further comprises a defrosting-use bypass circuit for merging a refrigerant discharged from a discharge port of the compressor with a refrigerant flowing between the pressure reducer and the outdoor heat exchanger; and a defrosting-use two-way valve provided in the defrosting-use bypass circuit, wherein during defrosting operation for defrosting the outdoor heat exchanger, the defrosting-use two-way valve and the bypass-use two-way valve are opened while heating operation is kept ongoing.
  • the heating operation can be continued even during defrosting operation.
  • the air conditioner of the second or third invention is configured so that the heat storage unit has a heat storage material for storing exhaust heat of the compressor, and a heat-storage heat exchanger for conducting heat of the heat storage material to the refrigerant flowing through the bypass circuit, and a heat-storage-material temperature detection means for detecting a temperature of the heat storage material is further included, and wherein while the temperature of the heat storage material is lower than a specified heat-storage-material temperature, the bypass-use two-way valve is kept closed.
  • the air conditioner of any one of the second to fourth invention is configured so that during a period from an end of defrosting operation till an elapse of a specified defrosting non-execution period, the bypass-use two-way valve is kept closed.
  • the defrosting operation when the defrosting operation is highly likely to be executed, temperature decreases of the heat storage material due to the refrigerant flowing through the bypass circuit, which may make it impossible to execute the defrosting operation, are suppressed.
  • the defrosting operation can be executed while the heating operation is continued.
  • the air conditioner of any one of the second to fifth invention further comprises an outside-air temperature detection means for detecting an outside air temperature, wherein when an outside air temperature detected by the outside-air temperature detection means is lower than a specified outside air temperature, the bypass-use two-way valve is kept closed.
  • the defrosting operation when the defrosting operation is highly likely to be executed, temperature decreases of the heat storage material due to the refrigerant flowing through the bypass circuit, which may make it impossible to execute the defrosting operation, are suppressed.
  • the defrosting operation can be executed while the heating operation is continued.
  • the air conditioner of any one of the second to sixth invention further comprises an outdoor-heat-exchanger temperature detection means for detecting a temperature of the outdoor heat exchanger, wherein while the temperature of the outdoor heat exchanger is lower than a specified outdoor-heat-exchanger temperature, the bypass-use two-way valve is kept closed.
  • the defrosting operation when the defrosting operation is highly likely to be executed, temperature decreases of the heat storage material due to the refrigerant flowing through the bypass circuit, which may make it impossible to execute the defrosting operation, are suppressed.
  • the defrosting operation can be executed while the heating operation is continued.
  • the air conditioner is configured so that after the indoor temperature has exceeded the target temperature and when a specified valve-opening time has elapsed since an opening of the bypass-use two-way valve, the bypass-use two-way valve is closed.
  • the air conditioner is configured so that after the indoor temperature has exceeded the target temperature, opening and closing of the bypass-use two-way valve is repeated to a plurality of times.
  • the air conditioner is configured so that an upper limit is provided for a number of opening and closing times of the bypass-use two-way valve.
  • the temperature decreasing extent of the indoor heat exchanger can be reduced smaller, and extreme temperature decreases of the indoor heat exchanger can be suppressed.
  • the air conditioner further comprises an indoor-heat-exchanger temperature detection means for detecting a temperature of the indoor heat exchanger, wherein when the temperature of the indoor heat exchanger is lower than a specified indoor heat exchanger temperature, the bypass-use two-way valve is closed.
  • the air conditioning can be executed at a certain temperature or higher, so that impairment of the indoor user's comfort can be avoided.
  • the air conditioner is configured so that during a period from a closing of the bypass-use two-way valve till an elapse of a specified closure time, the bypass-use two-way valve is kept closed.
  • Fig. 1 is a schematic constructional view of a refrigerating cycle in an air conditioner according to this Embodiment 1.
  • the air conditioner in this embodiment has an indoor unit 1 to be installed indoors, an outdoor unit 2 to be installed outdoors, and refrigerant piping 3 for connecting the indoor unit 1 and the outdoor unit 2 to each other.
  • the indoor unit 1 includes an indoor heat exchanger 5 for performing heat exchange between indoor air and a refrigerant, and an indoor blower fan 6 for accelerating heat exchange between air and refrigerant via the indoor heat exchanger 5 and moreover blowing air into the room.
  • the indoor unit 1 also includes a temperature sensor 7 which is an indoor temperature detection means for detecting an indoor temperature, and a temperature sensor 8 which is an indoor-heat-exchanger temperature detection means for detecting a temperature of the indoor heat exchanger.
  • the outdoor unit 2 includes: an outdoor heat exchanger 9 for performing heat exchange between outdoor air and refrigerant; an outdoor fan 10 for blowing air to the outdoor heat exchanger 9 to accelerate the heat exchange between air and refrigerant via the outdoor heat exchanger 9; a compressor 11 for compressing a refrigerant to discharge a high-temperature gas state refrigerant; a four-way valve 12 for switching a flow direction of the refrigerant; a pressure reducer 13 for reducing the pressure of the refrigerant; a temperature sensor 14 which is an outdoor-heat-exchanger temperature detection means for detecting a temperature of the outdoor heat exchanger 9; and a temperature sensor 15 which is an outside-air temperature detection means for detecting a temperature of outside air.
  • the compressor 11, the four-way valve 12, the indoor heat exchanger 5, the pressure reducer 13, and the outdoor heat exchanger 9 constitute a refrigerating cycle of the air conditioner.
  • Fig. 2 shows a refrigerating cycle for the heating operation.
  • bypass circuit 16 for connecting one point between the pressure reducer 13 and the indoor heat exchanger 5 with another point between the four-way valve 12 and the compressor 11 is provided in the outdoor unit 2.
  • This bypass circuit 16 is provided with a bypass-use two-way valve 17 for opening and closing the bypass circuit 16.
  • the air conditioner is equipped with a remote control unit (not shown) for giving an operation instruction to the indoor unit 1.
  • the remote control unit is enabled to issue an instruction for cooling operation or heating operation and to set an indoor set temperature (target temperature).
  • air-conditioning operation is executed so that the indoor temperature becomes an indoor set temperature.
  • the air conditioner is so designed that during heating operation, after an indoor temperature detected by the temperature sensor 7 has exceeded the indoor set temperature set by the remote control unit and when a specified compressor-stop condition is satisfied, the compressor 11 is stopped from operating (hereinafter, referred to as 'thermo-off operation').
  • 'thermo-off operation' By this thermo-off operation, i.e. by the stop of the compressor 11, power consumption of the air conditioner is suppressed.
  • the specified compressor-stop condition previously set for a start of the thermo-off operation.
  • a specified temperature difference e.g., 3°C
  • a specified duration time e.g. 3 min.
  • the stop condition for the compressor 11 has only to be a condition for stopping the compressor 11 while the indoor temperature keeps stable, and therefore other conditions such as time elapsed since an operation start may also be combined in addition to the above-described specified temperature and specified duration time.
  • thermo-off operation i.e. stopping the compressor 11
  • executing the thermo-off operation involves a stop of the indoor air conditioning, giving rise to a possibility that indoor user's comfort may be impaired.
  • thermo-off operation After execution of the thermo-off operation, when the operation of the compressor 11 is resumed, the compressor 11 is operated in a high operating-frequency state until the refrigerating cycle is stabilized. In this case, power consumption used for restart of the compressor 11 surpasses the electric energy suppressed by the thermo-off operation. Therefore, although the power consumption of the air conditioner is lowered by the thermo-off operation, yet the power consumption is increased eventually.
  • the air conditioner of Embodiment 1 is so designed that before the condition for execution of the thermo-off operation is satisfied, more specifically, after the indoor temperature has exceeded the indoor set temperature and before a specified stop condition for the compressor 11 is satisfied, the high-pressure liquid state refrigerant that has passed through the indoor heat exchanger 5 is made to flow via the bypass circuit 16 to an inlet port of the compressor 11 (hereinafter, referred to as 'thermo-off operation delay control').
  • the thermo-off operation delay control the refrigerant gas outputted from the compressor 11 and directed toward the indoor heat exchanger 5 is decreased in pressure, so that the temperature of the indoor heat exchanger 5 is lowered.
  • Lowering of the temperature of the indoor heat exchanger 5 causes the temperature of the air blown into the room by the blower fan 6 to be lowered, so that the specified compressor stop condition becomes less likely to be satisfied, that is, a start of the thermo-off operation is delayed.
  • Fig. 2 is a flowchart for the transition to the thermo-off operation delay control.
  • Step 21 it is decided whether the compressor 11 is in operation or not (ON or OFF). If the compressor 11 is in operation, the program goes to Step 22, and if the compressor 11 is at an operation stop, the program returns to the start.
  • the condition for execution of the thermo-off operation delay control is a condition which is relaxed gentler than the condition for execution of the thermo-off operation (specified compressor-stop condition) and which is a condition that necessarily needs to be satisfied before the condition for execution of the thermo-off operation is satisfied.
  • the condition for execution of the thermo-off operation (specified compressor-stop condition) is satisfied when a state that the indoor temperature is higher than an indoor set temperature by a first temperature difference (e.g., 3°C) has lasted for a first duration time (e.g., 3 min.), so that the compressor 11 is stopped from operation.
  • the condition for execution of the thermo-off operation delay control is satisfied when a state that the indoor temperature is higher than the indoor set temperature by a second temperature difference (e.g., 2°C) has lasted for a second duration time (e.g., 2 min.).
  • the first temperature difference is higher than the second temperature difference and the first duration time is longer than the second duration time, but these are not limitative.
  • the first temperature difference may be set lower than the second temperature difference or the first duration time may be set shorter than the second duration time. That is, it is essential only that the condition for execution of the thermo-off operation delay control is necessarily satisfied before the condition for execution of the thermo-off operation is satisfied.
  • Step 22 If it is decided at Step 22 that the condition for execution of the thermo-off operation delay control is satisfied, the program goes to Step 23. On the other hand, if the condition for execution of the thermo-off operation delay control is not satisfied, the program returns to step 21.
  • Step 23 it is decided whether a temperature of the indoor heat exchanger 5 is not lower than a specified indoor heat exchanger temperature.
  • the reason of providing this Step 23 is that a flow of the refrigerant into the bypass circuit 16 in a low-temperature state of the indoor heat exchanger 5 may cause the indoor heat exchanger 5 to extremely lower in temperature, so that the indoor user's comfort may be impaired. If the temperature of the indoor heat exchanger 5 is not lower than the specified indoor heat exchanger temperature, the program goes to Step 24. If the temperature of the indoor heat exchanger 5 is lower than the specified indoor heat exchanger temperature, the program returns to Step 21.
  • Step 24 it is decided whether or not a specified closure time has elapsed since a last-time closure of the bypass-use two-way valve 17.
  • This Step 24 makes it possible to avoid the occurrence that frequent repetitions of opening and closing of the bypass-use two-way valve 17 cause the bypass-use two-way valve 17 to come earlier to a limit number of its opening and closing times (i.e., its service life is shortened).
  • Step 25 If the specified closure time (e.g., 20 min.) has elapsed since the last-time closure of the bypass-use two-way valve 17, the program goes to Step 25, where the thermo-off operation delay control is executed. On the other hand, if the specified closure time has not elapsed, the program returns to Step 21.
  • the specified closure time e.g. 20 min.
  • thermo-off operation delay control is executed. Subsequently, the thermo-off operation delay control will be described in detail.
  • Fig. 3 is a flowchart of the thermo-off operation delay control.
  • Step 31 the bypass-use two-way valve 17 is opened.
  • the refrigerant in a high-pressure liquid state flows via the bypass circuit 16 to the inlet port of the compressor 11, so that the refrigerant gas outputted from the compressor 11 is lowered in pressure and, resultantly, the temperature of the indoor heat exchanger 5 is lowered. Therefore, the temperature difference between indoor temperature and indoor set temperature becomes smaller, so that the condition for execution of the thermo-off operation (specified compressor-stop condition) becomes less likely to be satisfied.
  • the possibility that the thermo-off operation is executed (the compressor 11 is stopped with the indoor air conditioning stopped) is reduced, so that the user's comfort can be maintained.
  • increases in power consumption due to restarts of the compressor 11 can be avoided.
  • Step 32 it is decided whether or not a specified valve-opening time (e.g., 5 sec.) has elapsed since opening of the bypass-use two-way valve 17. If the specified valve-opening time has elapsed, the program goes to Step 33. If the specified valve-opening time has not elapsed, the program returns to Step 31.
  • a specified valve-opening time e.g., 5 sec.
  • Step 33 the bypass-use two-way valve 17 is closed.
  • Step 34 it is decided whether or not a specified valve-closing time (e.g., 20 sec.) has elapsed. If the specified valve-closing time has elapsed, the program goes to Step 35; if the specified valve-closing time has not elapsed, the program returns to Step 33. It is noted that setting the specified valve-opening time shorter than the specified valve-closing time makes it possible to suppress extreme temperature decreases of the indoor heat exchanger 5, so that the indoor user's comfort can be maintained.
  • a specified valve-closing time e.g. 20 sec.
  • Step 35 it is decided whether or not the number of opening and closing times of the bypass-use two-way valve 17 has reached an upper-limit value.
  • an upper-limit value With one cycle taken as a course from an opening to a closing of the bypass-use two-way valve 17, and with setting of an upper-limit value for the number of times of execution of this cycle, excess number of opening and closing times of the bypass-use two-way valve 17 beyond the upper-limit value can be suppressed. Thus, reliability of the bypass-use two-way valve 17 is secured. Further, the temperature decreasing extent of the indoor heat exchanger 5 can be suppressed to a smaller one, and extreme temperature decreases of the indoor heat exchanger 5 can be suppressed, so that the indoor user's comfort can be maintained. If the number of opening and closing times of the bypass-use two-way valve 17 has reached the upper-limit value, the thermo-off operation delay control is ended. If the number of opening and closing times has not reached the upper-limit value, the program goes to Step 36.
  • Step 36 it is decided whether the temperature of the indoor heat exchanger 5 is not lower than a specified indoor heat exchanger temperature.
  • the reason of providing this Step 36 is the same as that for Step 23.
  • a flow of the refrigerant into the bypass circuit 16 in a low-temperature state of the indoor heat exchanger 5 may cause the indoor heat exchanger 5 to extremely lower in temperature, so that the indoor user's comfort may be impaired.
  • the specified indoor heat exchanger temperature is set in correspondence to an indoor set temperature set by the remote control unit.
  • the specified indoor heat exchanger temperature may be determined either in a unique correspondence or not in a unique correspondence to the indoor set temperature depending on the structure of the refrigerating cycle.
  • the specified indoor heat exchanger temperature in Step 23 shown in Fig. 2 and the specified indoor heat exchanger temperature in Step 36 shown in Fig. 3 may be equal to, or different from, each other depending on the structure of the refrigerating cycle.
  • Step 36 If it is decided at Step 36 that the indoor heat exchanger temperature is not lower than the specified indoor heat exchanger temperature, the program returns to Step 31, where the thermo-off operation delay control is continued. On the other hand, if the indoor heat exchanger temperature is lower than the specified indoor heat exchanger temperature, the thermo-off operation delay control is ended.
  • the refrigerant is made to flow through the bypass circuit 16 during heating operation to lower the temperature of the indoor heat exchanger 5, so that the execution of the thermo-off operation, which is an operation involving the stopping of the compressor 11, can be delayed.
  • the heating operation can be fulfilled while the indoor user's comfort is maintained.
  • the stopping of the compressor 11 is delayed, power consumption due to restarts of the compressor 11 can be prevented.
  • Fig. 4 is a schematic constructional view of a refrigerating cycle in an air conditioner according to Embodiment 2.
  • the same component members as in Embodiment 1 are designated by the same reference signs as those of Embodiment 1. Also, the description of the same component members as in Embodiment 1 is omitted.
  • a difference of Embodiment 2 from Embodiment 1 lies in that the air conditioner of this Embodiment 2 includes a heat storage unit 18 and a defrosting-use bypass circuit 21.
  • the heat storage unit 18 is provided in the bypass circuit 16.
  • the heat storage unit 18 also has a heat storage material 19 which is housed inside a heat storage container wound around the compressor 11 and formed from resin and which serves for storing exhaust heat radiated from the compressor 11.
  • a heat storage material for example, a solution mixed with chemical substances such as ethylene glycol aqueous solution, simple water, and metal members such as aluminum and copper may be used. That is, the heat storage material 19 has only to be a substance capable of storing exhaust heat radiated from the compressor 11.
  • a heat-storage heat exchanger 20 is provided in the heat storage material 19 (heat storage container). Between the refrigerant flowing through refrigerant piping provided inside the heat-storage heat exchanger and the heat storage material 19, heat exchange is performed.
  • the heat storage material 19 exchanges heat with the refrigerant of a high-pressure liquid state flowing through the bypass circuit 16 to run toward the inlet port of the compressor 11.
  • a temperature sensor 23 which is a heat-storage-material temperature detection means for detecting a temperature of the heat storage material 19 is provided.
  • a defrosting-use bypass circuit 21 is further provided for merging a refrigerant discharged from a discharge port of the compressor 11 with a refrigerant flowing between the pressure reducer 13 and the outdoor heat exchanger 9.
  • a defrosting-use two-way valve 22 is provided in the defrosting-use bypass circuit 21. As the defrosting-use two-way valve 22 is opened, the refrigerant flows through the defrosting-use bypass circuit 21.
  • Defrosting operation of the air conditioner constructed as described above is explained below.
  • defrosting operation can be carried out while heating operation is continued.
  • the defrosting operation is started.
  • the defrosting-operation start condition is not limited to this.
  • other conditions such as outside air temperature or a case that the temperature of the outdoor heat exchanger has kept lower than the temperature of the defrosting-operation start condition continuously for a specified time duration may be added.
  • the detection of the temperature of the outdoor heat exchanger 9 may also be fulfilled by detecting a temperature of refrigerant piping of the outdoor heat exchanger 9.
  • the defrosting-use two-way valve 22 and the bypass-use two-way valve 17 are opened, and the pressure reducer 13 is controlled to a proper openness.
  • the defrosting operation can be executed while heating operation is continued.
  • Such defrosting operation under continued heating operation is carried out in a state that both the defrosting-use two-way valve 22 and the bypass-use two-way valve 17 are opened.
  • the bypass-use two-way valve 17 is opened earlier than the defrosting-use two-way valve 22, heat quantity stored in the heat storage material 19 is used wastefully (i.e. not used for defrosting).
  • the defrosting-use two-way valve 22 and the bypass-use two-way valve 17 are opened simultaneously, a refrigerant that has flowed from the defrosting-use bypass circuit 21 and passed through the outdoor heat exchanger 9 and another refrigerant that has flowed from the indoor heat exchanger 5 and passed through the bypass circuit 16 are simultaneously taken into the compressor 11.
  • Fig. 5 is a flowchart for the transition to the thermo-off operation delay control.
  • Steps 51 to 54 are of the same contents as Steps 21 to 24 shown in Fig. 2 and so their description is omitted. However, in Step 54 in this Embodiment 2, if it is decided that a specified closure time has elapsed since a last-time closure of the bypass-use two-way valve 17, the program goes to Step 55.
  • Step 55 it is decided whether the temperature of the heat storage material 19 is not lower than a specified heat-storage-material temperature (e.g., 80°C).
  • a specified heat-storage-material temperature e.g. 80°C.
  • the lower the temperature of the heat storage material 19 the larger the temperature decreasing extent of the indoor heat exchanger 5 after an opening of the bypass-use two-way valve 17 becomes, so that the indoor user's comfort is more likely to be impaired.
  • opening of the bypass-use two-way valve 17 i.e., execution of the thermo-off operation delay control at later-described Step 59
  • the user's comfort may cause the user's comfort to be further impaired.
  • Step 56 if the temperature of the heat storage material 19 is not lower than the specified heat-storage-material temperature, the program goes to Step 56. On the other hand, if the temperature of the heat storage material 19 is lower than the specified heat-storage-material temperature, the program returns to Step 51.
  • Step 56 it is decided whether or not a specified defrosting non-execution period has elapsed since an end of the last-time defrosting operation. Once the defrosting operation is executed, it is highly likely that the defrosting operation is executed repeatedly. Then, if the bypass-use two-way valve 17 is opened before execution of the next-time defrosting operation, causing the temperature of the heat storage material 19 to be lowered, it becomes impossible to execute the defrosting operation while the heating operation is kept ongoing, so that the user's comfort may be impaired.
  • Step 56 it is decided whether or not a specified defrosting non-execution period (e.g., 1 hour) has elapsed since an end of the last-time defrosting operation. If the specified defrosting non-execution period has elapsed since an end of the last-time defrosting operation, the program goes to Step 57. On the other hand, if the specified defrosting non-execution period has not elapsed since an end of the last-time defrosting operation, the program returns to Step 51.
  • a specified defrosting non-execution period e.g. 1 hour
  • Step 57 it is decided whether the temperature of the outdoor heat exchanger 9 is not lower than a specified outdoor-heat-exchanger temperature.
  • the bypass-use two-way valve 17 is opened (i.e., the thermo-off operation delay control in later-described Step 59 is executed), the temperature of the heat storage material 19 is lowered, so that it may become impossible to execute the defrosting operation while the heating operation is kept ongoing.
  • the program goes to Step 58. If the temperature is lower than the specified outdoor-heat-exchanger temperature, the program returns to Step 51.
  • Step 58 it is decided whether the outside air temperature is not lower than a specified outside air temperature (e.g., -1°C).
  • a specified outside air temperature e.g., -1°C.
  • Step 59 the thermo-off operation delay control is executed.
  • the program returns to Step 51.
  • thermo-off operation delay control of Step 59 is of the same contents as the thermo-off operation delay control of Embodiment 1 shown in Fig. 3 , and so its description is omitted.
  • the heating operation can be continued while the defrosting operation is kept ongoing securely, and moreover the thermo-off operation delay control is executed when the defrosting operation is less likely to be executed. As a result, the heating operation can be executed while the user's comfort is maintained.
  • the present invention is applicable not only to air conditioners that perform ordinary four-way valve defrosting but also to air conditioners that perform defrosting operation while heating operation is kept ongoing.
EP12157794.4A 2011-09-05 2012-03-01 Air conditioner Active EP2565559B1 (en)

Applications Claiming Priority (1)

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JP2011192671A JP5375904B2 (ja) 2011-09-05 2011-09-05 空気調和機

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EP2565559A3 EP2565559A3 (en) 2015-02-18
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CN106482378A (zh) * 2016-10-19 2017-03-08 广东美的制冷设备有限公司 空调系统及其控制方法
CN106482303B (zh) * 2016-11-25 2022-05-17 广州华凌制冷设备有限公司 一种空调器及其制冷控制方法
JP2020079679A (ja) * 2018-11-13 2020-05-28 Nok株式会社 熱管理システム
CN109945431B (zh) * 2019-03-20 2020-11-24 珠海格力电器股份有限公司 温度调节方法、装置、系统及空调
JP7417368B2 (ja) * 2019-05-27 2024-01-18 シャープ株式会社 空気調和機
CN110470017A (zh) * 2019-08-03 2019-11-19 青岛海尔空调器有限总公司 用于空调除霜的控制方法及装置、空调
CN111351248B (zh) * 2020-03-13 2021-10-08 海信（山东）空调有限公司 一种空调系统及控制方法

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CN102980247B (zh) 2016-12-14
EP2565559A2 (en) 2013-03-06
JP2013053818A (ja) 2013-03-21
CN102980247A (zh) 2013-03-20
EP2565559A3 (en) 2015-02-18
JP5375904B2 (ja) 2013-12-25

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