EP2015005A2 - Klimaanlage und Verfahren zum Steuern derselben - Google Patents

Klimaanlage und Verfahren zum Steuern derselben Download PDF

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Publication number
EP2015005A2
EP2015005A2 EP08012385A EP08012385A EP2015005A2 EP 2015005 A2 EP2015005 A2 EP 2015005A2 EP 08012385 A EP08012385 A EP 08012385A EP 08012385 A EP08012385 A EP 08012385A EP 2015005 A2 EP2015005 A2 EP 2015005A2
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EP
European Patent Office
Prior art keywords
refrigerant
indoor
unit
indoor unit
valve
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
EP08012385A
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English (en)
French (fr)
Other versions
EP2015005B1 (de
EP2015005A3 (de
Inventor
Tetsuya Kozai
Yoshiki Hata
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.)
Hitachi Johnson Controls Air Conditioning Inc
Original Assignee
Hitachi Appliances Inc
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Filing date
Publication date
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Publication of EP2015005A2 publication Critical patent/EP2015005A2/de
Publication of EP2015005A3 publication Critical patent/EP2015005A3/de
Application granted granted Critical
Publication of EP2015005B1 publication Critical patent/EP2015005B1/de
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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
    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel 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
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
    • 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
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves

Definitions

  • the present invention relates to a multi-type air conditioner having plural indoor units combined with a single outdoor unit, and to a method for controlling such an air conditioner.
  • Japanese Patent No. 2925694 discloses a multi-type air conditioner having plural indoor units connected to a single outdoor unit, in which one of the indoor units has a decompression valve and heat exchanger incorporated therein, and the other indoor unit has only a heat exchanger incorporated therein with a decompression valve provided in a refrigerant pipe connected to the other indoor unit.
  • the other indoor unit has no decompression valve, but instead the decompression valve connected to the refrigerant pipe adjusts the amount of refrigerant. This allows coexistence of different types of indoor units such as package air conditioners and room air conditioners.
  • the cycle balance is lost, resulting in lack of refrigerant in the cooling-heating cycle.
  • the lack of refrigerant in the cooling cycle or heating cycle has negative effects, such as degradation of insulation due to insufficient cooling in a compressor motor, degradation of freezer oil and refrigerant due to increase of discharge gas temperature, and degradation of air conditioning performance due to reduction of refrigerant circulation amount.
  • the lack of refrigerant in the cooling-heating cycle is solved by adding an appropriate amount of refrigerant.
  • the present invention aims at providing an air conditioner designed to increase flexibility in installation of indoor units, by allowing connection of a predetermined number or more of indoor units to a single outdoor unit, or connection of indoor units whose total capacity exceeds the capacity of an outdoor unit, and providing a method for controlling such an air conditioner.
  • the present invention is an air conditioner having an outdoor unit and plural indoor units connected by refrigerant pipes.
  • an expansion valve is provided in one of plural refrigerant pipes connecting an arbitrary one of the indoor units with the outdoor unit, and an on-off valve is provided in another refrigerant pipe.
  • the present invention is an air conditioner having an outdoor unit and plural indoor units connected by refrigerant pipes.
  • the plural indoor units include a first indoor unit having an expansion valve and heat exchanger incorporated therein, and a second indoor unit having a heat exchanger but no expansion valve incorporated therein.
  • an expansion valve is provided in one of plural refrigerant pipes connecting the second indoor unit with the outdoor unit, and an on-off valve is provided in another refrigerant pipe.
  • the present invention is an air conditioner having an outdoor unit and plural indoor units connected by refrigerant pipes.
  • the plural indoor units include a first indoor unit having an expansion valve and a heat exchanger incorporated therein, and a second indoor unit having a heat exchanger but no expansion valve incorporated therein.
  • an on-off valve is connected to one of plural refrigerant pipes connecting the outdoor unit with the first indoor unit, which is other than the refrigerant pipe in which the expansion valve of the first indoor unit is provided.
  • the present invention is a method for controlling an air conditioner having an outdoor unit and plural indoor units connected by refrigerant pipes.
  • an expansion valve is provided in one of plural refrigerant pipes connecting an arbitrary one of the indoor units with the outdoor unit, and an on-off valve is provided in another refrigerant pipe.
  • the method includes the steps of: closing, when stopping the arbitrary indoor unit, the valve provided in one of the plural refrigerant pipes, which is assigned to the outward flow, while opening the valve provided in the other refrigerant pipe; operating the arbitrary indoor unit for a predetermined period of time in such a state; and collecting the refrigerant from the arbitrary indoor unit into the outdoor unit via the open valve.
  • the open valve provided in the other refrigerant pipe is closed after the operation for collecting the refrigerant from the indoor unit into the outdoor unit is performed for a predetermined period of time.
  • the present invention is a method for controlling an air conditioner having an outdoor unit and plural indoor units connected by refrigerant pipes.
  • the plurality indoor units include a first indoor unit hiving an expansion valve and a heart exchanger incorporated therein, and a second indoor unit having a heart exchanger but not expansion valve incorporated therein.
  • an expansion valve is provided in one of plural refrigerant pipes connecting the second indoor unit with the outdoor unit, and an on-off valve is provided in another refrigerant pipe.
  • the method includes the steps of: opening the valve provided in one of the plural refrigerant pipes connected to the second unit, which is assigned to the outward flow, while closing the valve provided in the other refrigerant pipe; operating the second indoor unit for a predetermined time in such a state; and collecting the refrigerant from the second indoor unit into the outdoor unit via the open valve.
  • the valve provided in the other refrigerant pipe is closed after the refrigerant in the second indoor unit is collected in the outdoor unit.
  • the present invention is a method for controlling an air conditioner having an outdoor unit and plural indoor units connected by refrigerant pipes.
  • the plurality indoor units include a first indoor unit hiving an expansion valve and a heart exchanger incorporated therein, and a second indoor unit having a heart exchanger but not expansion valve incorporated therein.
  • an on-off valve is connected to one of plural refrigerant pipes connecting the first indoor unit with the outdoor unit, which is other than the refrigerant pipe in which the expansion valve of the first indoor unit is provided.
  • the method includes the steps of: closing the expansion valve of the first indoor unit while opening the on-off valve; operating the first indoor unit for a predetermined period of time in such a state; and collecting the refrigerant from the first indoor unit into the outdoor unit via the open on-off valve.
  • the on-off valve is closed after the refrigerant in the first indoor unit is collected in the outdoor unit.
  • an air conditioner designed to increase flexibility in installation of indoor units, by allowing connection of a predetermined number or more of indoor units to a single outdoor unit, or connection of indoor units whose total capacity exceeds the capacity of an outdoor unit, without suffering from a lack of refrigerant in the cooling-heating cycle.
  • Fig. 1 is a configuration diagram of a cooling-heating cycle of a multi-air conditioner (a multi-type air conditioner) according to an embodiment of the present invention.
  • the multi-air conditioner includes an outdoor unit A, plural indoor units a (a1, a2, and an) and b (b1, b2, and bn), and refrigerant pipes D1 D2 for connecting each of the units.
  • the refrigerant pipes D1 D2 are branched and connected with a gas-side branch pipe 8 and a liquid-side branch pipe 9, respectively, to distribute and supply refrigerant to the indoor units a and b.
  • the refrigerant pipe D1 is connected to a gas side stop valve 1 of the outdoor unit A, and the refrigerant pipe D2 is connected to a liquid side stop valve 2 thereof. In this way, a cooling-heating cycle system is formed.
  • the indoor unit a is an indoor unit having a decompression device (indoor expansion valve 5) incorporated therein, and including an indoor fan 3 and an indoor heat exchanger 4.
  • the indoor unit b is an indoor unit having no decompression device (indoor expansion valve 5) incorporated therein, and including the indoor fan 3 and the indoor heat exchanger 4.
  • the indoor unit b is connected with an external decompression device C at the middle of the refrigerant pipes D2, D1 which are respectively connected to the liquid side branch pipe 9 and the gas side branch pipe 8.
  • the external decompression device C has an expansion valve 6 externally connected to the refrigerant pipe D2, and an electromagnetic valve (on-off valve) 7 externally connected to the refrigerant pipe D1.
  • the indoor unit a is referred to as a first indoor unit, and the indoor unit b as a second indoor unit.
  • reference numeral 10 denotes a compressor
  • 11 denotes a four-way valve
  • 12 denotes an outdoor fan
  • 13 denotes an outdoor heat exchanger
  • 14 denotes an outdoor expansion valve
  • 15 denotes a refrigerant tank
  • 16 denotes an accumulator.
  • the arrows indicate the directions of the refrigerant flowing through the refrigerant pipes. More specifically, the solid arrows indicate the flow in cooling operation, and the dotted arrows in the opposite direction indicate the flow in heating operation.
  • the refrigerant flow direction is determined by switching of the four-way valve 11 in the outdoor unit A.
  • Fig. 2 is a control block diagram according to an embodiment of the present invention.
  • Reference numeral 17 denotes a remote control for providing operation instructions (such as operation, stop, operation mode, air volume/direction setting, and temperature setting) to the indoor units a, b.
  • Reference numeral 18 denotes a remote control line.
  • Reference numeral 20 denotes a central control unit for controlling the entire operation of the multi-air conditioner.
  • Reference numeral 23 denotes a controller of the outdoor unit A.
  • Reference numeral 24 denotes a controller of the indoor unit a.
  • Reference numeral 25 denotes a controller of the indoor unit b.
  • Reference numeral 21 denotes a central control transmission line for connecting the central control unit 20 and the controller 23.
  • Reference numeral 19 denotes an indoor-outdoor transmission line for connecting the outdoor unit A and the indoor units a, b.
  • Reference numeral 22 denotes an external decompression device transmission line for connecting the controller 25 and the external decompression device C.
  • Fig. 3 is a control system diagram according to an embodiment of the present invention.
  • the remote control 17 first issues an operation instruction to the indoor unit a. Then, the controller 24 transmits the information about the state of the indoor unit a as well as the instruction of the remote control 17, to the outdoor unit A. Based on this transmission, the controller 23 of the outdoor unit A transmits the information of the outdoor unit A, the information of the indoor unit a, and the information (instruction) of the remote control 17, to the central control unit 20.
  • the central control unit 20 Upon receiving such information, the central control unit 20 transmits an instruction (such as operation, stop, operation mode, air volume/direction setting, temperature setting, or remote control permission/prohibition), to the controller 23 in order to collectively manage the indoor units based on a control program stored in advance.
  • the controller 23 transmits the instruction from the indoor unit A to the controller 24, based on the instruction of the central control unit 20.
  • the controller 24 transmits the information of the indoor unit a as well as the information of the outdoor unit A, to the remote control 17.
  • the controller 24 transmits an instruction for controlling the opening degree of the expansion valve, to the expansion valve 5 of the indoor unit a.
  • the controller 25 transmits the information about the state of the indoor unit b as well as the instruction of the remote control 17, to the outdoor unit A in a similar way as described above. Based on this transmission, the controller 23 transmits the information of the outdoor unit A, the information of the indoor unit b, and the information (instruction) of the remote control 17, to the central control unit 20.
  • the central control unit 20 Upon receiving such information, the central control unit 20 transmits an instruction (such as operation, stop, operation mode, air volume/direction setting, temperature setting, or remote control permission/prohibition) to the controller 23 in order to collectively manage the indoor units, based on a control program stored in advance.
  • the controller 23 transmits the instruction from the indoor unit A to the controller 25 of the indoor unit b, based on the instruction of the central control unit 20.
  • the controller 25 transmits the information of the indoor unit b as well as the information of the outdoor unit A, to the remote control 17.
  • the controller 25 transmits an instruction for controlling the opening degree of the expansion valve, to the expansion valve 6 of the external decompression device C.
  • controller 25 transmits an instruction for controlling on/off of the electromagnetic valve, to the electromagnetic valve 7 of the external decompression device C.
  • the remote control information is exchanged between the remote controls 17, and the indoor unit information is exchanged between the indoor units 24 and 25.
  • air conditioning operation of the control system is started by an operation instruction from the remote control 17 or from the central control unit 20.
  • the air conditioning operation is continued with the entire system monitored by the central control unit 20.
  • the remote control 1 or the central control unit 20 first issues an operation instruction, and the operation is finally started in step 101 based on the instruction of the central control unit 20. Next, it is determined whether there is a (stopped) indoor unit to which the operation instruction is not issued from the central control unit 20 in step 102. This determination is made by the central control unit 20 by collecting information of the indoor units a, b from the controllers 24, 25.
  • step 120 all the indoor units are stopped from starting operation, and a warning is issued.
  • step 103 determines whether the total capacity of the indoor units to be operated exceeds the capacity of the outdoor unit A.
  • step 103 When the determination result is NO in step 103, the total capacity does not exceed the capacity of the outdoor unit A, so that it is possible to operate the indoor units to be operated. Thus, normal operation is started in step 121.
  • step 103 When YES in step 103, the total capacity of the indoor units to be operated will exceed the capacity of the outdoor unit A, resulting in lack of refrigerant in the cooling-heating cycle.
  • a refrigerant collection operation control is started in step 104 to collect the refrigerant in (stopped) indoor units to which no operation instruction is issued from the central control unit 20. Then, the process proceeds to step 105.
  • step 105 the connection state of the external decompression device of each stopped indoor unit from which the refrigerant is to be collected, is confirmed. In other words, it is determined whether the external decompression device C including the expansion valve 6 and the electromagnetic on-off valve 7 is connected to each of the corresponding indoor units. This determination is made by the central control unit 20, based on the information of the indoor unit a or based on the information of the indoor unit b in the system diagram of Fig. 3 .
  • the indoor units from which the refrigerant is to be collected correspond to the stopped indoor units whose total amount of refrigerant calculated by the central control unit 20 reaches the amount to be collected.
  • step 106 the process proceeds to step 106 and step 115 to start operations of the corresponding indoor units from which the refrigerant is to be collected.
  • step 107 the process moves from step 106 to step 107 to determine whether the operation mode is cooling.
  • the cooling operation mode is determined (YES)
  • the expansion valve 6 of the decompression device C is closed in step 108.
  • the cooling operation is continued for a predetermined period of time in step 109.
  • the corresponding indoor unit is connected with the external decompression device C, namely, any of the indoor units b1, b2 and bn in Fig. 1 .
  • the cooling operation will be described taking an example in which the refrigerant is collected from the indoor unit b1 in Fig. 1 .
  • the refrigerant pipe D2 is assigned to the outward flow and the refrigerant pipe D1 is assigned to the inward flow.
  • step 108 the expansion valve 6 is closed, but the electromagnetic valve 7 is opened because the cooling operation is performed.
  • the refrigerant flows into the outdoor unit A in the direction of the solid arrow, through the refrigerant pipe D1 via the electromagnetic valve 7.
  • the refrigerant in the refrigerant pipe D2 is stopped from flowing by the expansion valve 6. In this way, the refrigerant in the indoor unit b1 is collected in the refrigerant tank 15 of the outdoor unit A from the heat exchanger 4 and from the refrigerant pipe connected thereto.
  • the cooling operation is performed for a predetermined period of time in step 109, and then the electromagnetic valve 7 is closed in step 110.
  • the cooling operation of the indoor unit b1 is stopped in step 111, and the refrigerant collection operation control is completed.
  • the electromagnetic valve 7 is closed to prevent unwanted penetration of refrigerant into the heat exchanger 4 and the like in the indoor unit b1 during normal air conditioning operation.
  • step 107 When NO (heating operation mode) in step 107, the electromagnetic valve 7 of the decompression device C is closed in step 112. Then, the heating operation is continued for a predetermined period of time in step 113. In this heating operation, the refrigerant pipe D1 is assigned to the outward flow and the refrigerant D2 is assigned to the inward flow.
  • the heating operation will be described taking an example in which the refrigerant is collected from the indoor unit b1 in Fig. 1 .
  • the electromagnetic valve 7 is closed in step 112, but the expansion valve 6 is opened because the heating operation is performed.
  • the refrigerant flows into the outdoor unit A in the dotted arrow direction through the refrigerant pipe D2 via the expansion valve 6.
  • the refrigerant in the refrigerant pipe D1 is stopped from flowing by the electromagnetic valve 7.
  • the refrigerant in the indoor unit b1 namely, the refrigerant contained in the heat exchanger 4 and in the refrigerant pipe connected thereto, is collected in the refrigerant tank 15 of the outdoor unit A.
  • the heat operation is performed for a predetermined period of time in step 113, and then the expansion valve 6 is closed in step 114.
  • the heating operation of the indoor unit b1 is stopped in step 111, and the refrigerant collection operation control is completed.
  • the expansion valve 6 is closed to prevent unwanted penetration of refrigerant into the heat exchanger 4 and the like in the indoor unit b1 during normal air conditioning operation.
  • step 115 the operation of the corresponding indoor unit is started in step 115. Then, it is determined whether the operation mode is cooling in step 116. When the cooling operation mode is determined (YES), the expansion valve 5 is closed in step 117, and the cooling operation is continued for a predetermined period of time in step 118. In the case of NO in step 105, the indoor unit is not connected with the external decompression device C, namely, any of the indoor units a1, a2, and an in Fig. 1 .
  • the cooling operation will be described taking an example in which the refrigerant is collected from the indoor unit a2 in Fig. 1 .
  • the cooling operation is performed with the expansion valve 5 closed, the refrigerant flows into the outdoor unit A in the solid arrow direction through the refrigerant pipe D1 from the indoor unit a2.
  • the refrigerant in the refrigerant pipe D2 is stopped from flowing by the expansion valve 5.
  • the refrigerant in the indoor unit a2 namely, the refrigerant contained in the indoor heat exchanger 4 and in the refrigerant pipe D1 connected thereto, is collected in the refrigerant tank 15 of the outdoor unit A.
  • the cooling operation is performed for a predetermined period of time in step 118, and then the cooling operation of the indoor unit a2 is stopped in step 111.
  • the refrigerant collection operation control is completed in a state in which the refrigerant pipe D1 on the side opposite to the expansion valve 5 is opened.
  • the electromagnetic valve 7 is additionally connected to the refrigerant pipe D1 of the indoor unit a2, as shown by the dotted line in Fig. 1 , so that the electromagnetic valve 7 is closed in step 122.
  • step 116 When NO in step 116, the indoor unit a2 is in the heating operation and the refrigerant flows in the dotted arrow direction. Because the refrigerant pipe D1 has no electromagnetic valve 7 to stop the flow, the refrigerant can flow through the refrigerant pipe D1 via the open expansion valve 5 without being collected from the indoor unit a2. For this reason, the operation of the indoor unit a2 is stopped in step 119, and a warning is issued.
  • the electromagnetic valve 7 is additionally connected to the refrigerant pipe D1, as shown by the dotted line in Fig. 1 .
  • the electromagnetic valve 7 is closed in step 123, instead of proceeding to step 119, and the heating operation is continued for a predetermined period of time in step 124.
  • the heating operation is performed with the electromagnetic valve 7 closed and the expansion valve 5 opened, the refrigerant flows in the dotted arrow direction through the refrigerant pipe D2 via the expansion valve 5.
  • the refrigerant in the indoor unit a1 namely, the refrigerant contained in the heat exchanger 4 and in the refrigerant pipe D2 connected thereto, is collected in the refrigerant tank 15 of the outdoor unit A.
  • the heating operation is performed for a predetermined period of time in step 124, and then the expansion valve 5 is closed in step 125.
  • the heating operation of the indoor unit a2 is stopped in step 111, and the refrigerant collection operation control is completed.
  • the expansion valve 5 is closed to prevent unwanted penetration of refrigerant into the indoor unit a2 during normal air conditioning operation.
  • the above described refrigerant collection operation can be performed for plural corresponding indoor units at a time, and completed by closing the necessary valve when the collected refrigerant reaches the necessary amount.
  • the refrigerant collection operation may also be performed on a one-by-one basis in order to surely collect the refrigerant from each of the corresponding indoor units.
  • step 121 the normal operation of the air conditioner is started in step 121.
  • the refrigerant does not flow into the stopped indoor units from which the refrigerant has been collected.
  • refrigerant circulating during the operation thereby preventing lack of refrigerant in the cooling-heating cycle.
  • the external decompression device C including the expansion valve 6 and the electromagnetic valve 7, is connected at the middle of the refrigerant pipes D2 connected to the indoor unit b having no decompression device incorporated therein.
  • the expansion valve 6 of the external decompression device C it is possible to adjust the amount of refrigerant flowing into the indoor unit b by the expansion valve 6 of the external decompression device C, even in the case in which the operation state of each indoor unit b as well as the load state and the like of each room are different.
  • This allows connection of different types of indoor units, namely, the indoor units b having no decompression device incorporated therein and the indoor units a having the decompression device incorporated therein.
  • this also allows connection of a predetermined number or more of indoor units to a single outdoor unit, or connection of indoor units whose total capacity exceeds the predetermined amount of capacity.
  • the external decompression device C including the expansion valve 6 and the electromagnetic valve 7, may be connected at the middle of the refrigerant pipes D1, D2 connecting the outdoor unit A and the indoor unit a having the decompression device incorporated therein.
  • the expansion valve 6 of the decompression device C is connected to the refrigerant pipe D1, D2 of the indoor unit b, so that there is no refrigerant flow noise and vibration in the indoor unit b.
EP08012385.4A 2007-07-12 2008-07-09 Klimaanlage Active EP2015005B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007183300A JP4500331B2 (ja) 2007-07-12 2007-07-12 空気調和装置及びその制御方法

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EP2015005A2 true EP2015005A2 (de) 2009-01-14
EP2015005A3 EP2015005A3 (de) 2011-09-21
EP2015005B1 EP2015005B1 (de) 2018-03-14

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JP (1) JP4500331B2 (de)
CN (1) CN101344289B (de)
ES (1) ES2673505T3 (de)

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CN102538299A (zh) * 2012-01-18 2012-07-04 上海汉福空气处理设备有限公司 热泵式可调温湿度机组
EP2899471A4 (de) * 2013-08-30 2015-11-04 Qingdao Hisense Hitachi Air Conditioning Sys Co Ltd Mehrstationsklimaanlage system für unterbodenheizung
US10429083B2 (en) 2013-08-30 2019-10-01 Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd. Multi-type air conditioner system
EP4030124A4 (de) * 2019-09-30 2022-11-16 Daikin Industries, Ltd. Kühlvorrichtung und wärmequelleneinheit

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JP4953018B2 (ja) 2005-03-15 2012-06-13 味の素株式会社 薬剤移送具

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102538299A (zh) * 2012-01-18 2012-07-04 上海汉福空气处理设备有限公司 热泵式可调温湿度机组
CN102538299B (zh) * 2012-01-18 2014-03-26 上海汉福空气处理设备有限公司 热泵式可调温湿度机组
EP2899471A4 (de) * 2013-08-30 2015-11-04 Qingdao Hisense Hitachi Air Conditioning Sys Co Ltd Mehrstationsklimaanlage system für unterbodenheizung
US10429083B2 (en) 2013-08-30 2019-10-01 Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd. Multi-type air conditioner system
EP4030124A4 (de) * 2019-09-30 2022-11-16 Daikin Industries, Ltd. Kühlvorrichtung und wärmequelleneinheit
US11686518B2 (en) 2019-09-30 2023-06-27 Daikin Industries, Ltd. Refrigeration apparatus that operates a utilization unit based on drivability of a compressor in a heat source unit

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EP2015005B1 (de) 2018-03-14
EP2015005A3 (de) 2011-09-21
CN101344289B (zh) 2012-04-25
JP2009019829A (ja) 2009-01-29
CN101344289A (zh) 2009-01-14
ES2673505T3 (es) 2018-06-22

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