EP1559969A1 - Conditionneur d'air - Google Patents

Conditionneur d'air Download PDF

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Publication number
EP1559969A1
EP1559969A1 EP04018471A EP04018471A EP1559969A1 EP 1559969 A1 EP1559969 A1 EP 1559969A1 EP 04018471 A EP04018471 A EP 04018471A EP 04018471 A EP04018471 A EP 04018471A EP 1559969 A1 EP1559969 A1 EP 1559969A1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
pipeline
air conditioner
heat exchanger
subcooling
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
EP04018471A
Other languages
German (de)
English (en)
Other versions
EP1559969B1 (fr
Inventor
Sung Oh Choi
Sung Chun Kim
Jong Han Park
Seok Ho Yoon
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP1559969A1 publication Critical patent/EP1559969A1/fr
Application granted granted Critical
Publication of EP1559969B1 publication Critical patent/EP1559969B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/02—Subcoolers
    • 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
    • F25B2313/007—Compression machines, plants or systems with reversible cycle not otherwise provided for three pipes connecting the outdoor side to the indoor side with multiple indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • 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
    • F25B2313/02331—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during cooling
    • 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
    • F25B2313/02334—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during heating
    • 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
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor 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
    • 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
    • F25B2400/13—Economisers

Definitions

  • the present invention relates to air conditioners, and more particularly, to an air conditioner of an improved air conditioning capability.
  • the air conditioner cools or heats a room space, such as a residential space, a restaurant, a library, or an office, is provided with a compressor, and a heat exchanger to circulate refrigerant for cooling/heating the room space.
  • the air conditioner is developed to a multi-type air conditioner which can cools and heats at the same time enabling to cool or heat all rooms in the same operation mode, for maintaining a more comfortable room environment without being influenced from external weather or environment.
  • Such a related art multi-type air conditioner has a plurality of indoor units each installed in each room and connected to one outdoor unit, for cooling or heating all rooms in a cooling or heating mode.
  • the present invention is directed to an air conditioner that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide an air conditioner having an improved air conditioning capability.
  • Another object of the present invention is to provide an air conditioner which can minimize a pressure loss of refrigerant flowing in a refrigerant pipe caused by lengthy refrigerant pipeline for guiding the refrigerant, and secure a subcooling state of refrigerant introduced into an expansion device.
  • the air conditioner includes an outdoor unit installed in outdoor having a compressor, an outdoor heat exchanger, an indoor unit installed in indoor having an indoor heat exchanger, a distributor for guiding refrigerant from the outdoor unit to the indoor unit proper to an operation condition, and refrigerant passed through the indoor unit to the outdoor unit, again, and a subcooling device for subcooling the refrigerant passed through a heat exchange process at the outdoor heat exchanger under an isobaric condition, and guiding the subcooled refrigerant to the distributor.
  • the subcooling device makes a portion of the refrigerant passed through the heat exchange process at the outdoor heat exchanger to expand, and the expanded portion of the refrigerant to heat exchange with rest unexpanded refrigerant.
  • the subcooling device includes a subcooling heat exchanger for making an expanded portion of the refrigerant to heat exchange with rest unexpanded refrigerant, a first connection pipeline haying an expansion device for expanding a portion of the refrigerant passed through a heat exchange process at the outdoor heat exchanger, for guiding expanded refrigerant to the subcooling heat exchanger, a second connection pipeline for guiding unexpanded refrigerant to the subcooling heat exchanger, a third connection pipeline for guiding unexpanded refrigerant passed through the subcooling heat exchanger to the distributor, and a fourth connection pipeline for guiding the expanded refrigerant passed through the subcooling heat exchanger to the refrigerant pipeline connected to a suction end of the compressor.
  • the subcooling heat exchanger includes a first flow pipeline having one end connected to the second connection pipeline, and the other end connected to the third connection pipeline for flow of unexpanded refrigerant, and a second flow pipeline having one end connected to the first connection pipeline, and the other end connected to the fourth connection pipeline for making heat exchange with the first flow pipeline, and flow of the expanded refrigerant.
  • the subcooling heat exchanger has a double pipe structure.
  • the second flow pipeline is provided in an inside of the first flow pipeline in a longitudinal direction.
  • the refrigerant flowing through the second flow pipeline has a flow direction opposite to a flow direction of the refrigerant flowing through the first flow pipeline, or a flow direction the same with a flow direction of the refrigerant flowing through the first flow pipeline.
  • the first flow pipeline is provided inside of the second flow pipeline in a longitudinal direction.
  • the subcooling heat exchanger has a length of 1m ⁇ 2.5m.
  • the subcooling heat exchanger further includes a heat exchange part on an inside wall for making a heat exchange area larger.
  • the heat exchange part is projected inward from an inside wall of the inner flow pipe.
  • the heat exchange part is provided on an inside wall of the inner flow pipe in a circumferential direction.
  • the heat exchange part is provided on an inside wall of the inner flow pipe in a longitudinal direction, or in a helix.
  • the expansion device is an electronic expansion valve.
  • the air conditioner further includes an accumulator on a refrigerant pipeline connected to the suction end of the compressor for separating gaseous refrigerant from liquid refrigerant.
  • the fourth connection pipeline is connected to a refrigerant pipeline connected to a refrigerant inlet to the accumulator.
  • the subcooling device is provided to a predetermined position of an inside of the outdoor unit.
  • the outdoor unit further includes a switching device for switching a flow direction of the refrigerant from the compressor to the outdoor heat exchanger or the distributor selectively proper to an operation condition.
  • the present invention provides a multi-type air conditioner which enables some of rooms operative in a cooling mode, while other rooms are operative in a heating mode according to room environments, improves degrees of freedom of installation of the multi-type air conditioner, and maintains a subcooling state of the refrigerant.
  • the air conditioner controls temperature, humidity, motion, and cleanliness of air so as to be suitable to a purpose of use for a particular area, for an example, room spaces, such as residential space, office, restaurant, and the like.
  • the air conditioner cools a room by compressing low pressure refrigerant having absorbed heat from the room and discharging the heat to an outdoor air, and, in a heating operation, heats the room by an opposite operation of the above process.
  • FIG. 1 illustrates a system diagram of an air conditioner in accordance with one preferred embodiment of the present invention, of a concurrent heating/cooling multi-type air conditioner that cools /heats rooms at the same time.
  • the concurrent heating/cooling multi-type air conditioner includes an outdoor unit 10, a distributor 20, and a plurality of indoor units 30a, 30b, and 30c in each of rooms.
  • the outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12, an outdoor fan 13 on one side of the outdoor heat exchanger, a switching device 15 for switching a compressed refrigerant flow from the compressor 11 to the outdoor heat exchanger or the distributor selectively proper to operation modes, and accumulator 14 on a refrigerant pipeline connected to a suction end of the compressor for separating vapor phase refrigerant from liquid phase refrigerant.
  • the outer unit 10 is connected to the distributor 20 by the switching device through a first pipeline 21 for guiding high pressure refrigerant from the compressor 11 to the distributor through the outdoor heat exchanger 12, a second refrigerant pipeline 22 for guiding the refrigerant from the compressor 11 to the distributor 20 directly, and a third refrigerant pipeline 23 connected between the distributor 20 and the suction end of the compressor 11.
  • Each of the indoor units 30a, 30b, and 30c includes an indoor heat exchanger 31a, 31b, or 31c, and an expansion device 32a, 32b, or 32c for expanding refrigerant introduced into the indoor heat exchanger to a preset state in a cooling mode.
  • the distributor 20 is designed such that the refrigerant is guided from the outdoor unit 10 to the expansion device 32a, 32b, or 32c of the indoor unit directly if the indoor unit is operated in the cooling mode, and the refrigerant is guided from the outdoor unit 10 to the indoor heat exchanger 31a, 31 b, or 31c of the indoor unit directly if the indoor unit is operated in the heating mode.
  • the distributor 20 includes first refrigerant branch pipelines 21a, 21b, and 21c branched from the first refrigerant pipeline 21 as many as a number of the indoor units, and connected to the indoor unit expansion devices 32a, 32b, and 32c respectively, second refrigerant branch pipelines 22a, 22b, and 22c branched from the second refrigerant pipeline and connected to the indoor heat exchangers 31a, 31b, and 31c respectively, and third refrigerant branch pipelines 23a, 23b, and 23c branched from the third refrigerant pipeline 23, and connected to the indoor heat exchangers 31 a, 31b, and 31c, respectively.
  • the second refrigerant branch pipelines 22a, 22b, and 22c have first electronic shut off valves 26a, 26b, and 26c, respectively, and the third refrigerant branch pipeline 23a, 23b, and 23c have second electronic shut off valves 27a, 27b, and 27c, respectively.
  • the first electronic shut off valve on the second refrigerant branch pipeline connected to the indoor unit is opened, and the second electronic shut off valve on the third refrigerant branch pipeline connected to the indoor unit is closed, such that the refrigerant flows from the compressor 11 to the indoor heat exchanger through the second refrigerant pipeline 22, and the second refrigerant branch pipeline connected to the indoor unit.
  • the first electronic shut off valve on the second refrigerant branch pipeline connected to the indoor unit operated in the cooling mode is closed, and the second electronic shut off valve on the third refrigerant branch pipeline connected to the indoor unit is opened, such that the refrigerant having introduced through the first refrigerant branch pipeline connected to the indoor unit, and expanded at the indoor unit expansion device is introduced into the third refrigerant pipeline 23 through the indoor heat exchanger of the indoor unit and the third refrigerant branch pipeline connected to the indoor unit.
  • the distributor 20 includes a bypass pipe 25 connected between the second refrigerant pipeline 22, and the third refrigerant pipeline 23, and an electronic conversion valve 25a on the bypass pipe for converting high pressure refrigerant stagnant at the second refrigerant pipeline 22 into a low pressure refrigerant, for preventing liquefaction of the refrigerant due to the stagnation of high pressure refrigerant in a case all the indoor units are operated in the cooling mode.
  • the concurrent heating/cooling multi-type air conditioner further includes a subcooling device 100 on the first refrigerant pipeline 21 connected between the outdoor heat exchanger 12 and the distributor 20.
  • the subcooling device 100 subcools the refrigerant passed through a heat exchange process at the outdoor heat exchanger under an isobaric condition, and guides to the distributor, i.e., expands a portion of the refrigerant from the outdoor heat exchanger 12, makes the expanded refrigerant to heat exchange with rest of the refrigerant discharged from the outdoor heat exchanger, and flowing toward the distributor 20 following the first refrigerant pipeline 21, and introduce into the third refrigerant pipeline 23 connected between the distributor 20 and the suction end of the compressor 11.
  • the subcooling device 100 will be described in detail with reference to FIGS. 3 ⁇ 5, later.
  • the distributor 20 further includes a supplementary subcooling device 24 of a coaxial tube fitted between the distributor 20 and the first refrigerant pipeline 21.
  • the supplementary subcooling device 24 secures subcooling of the refrigerant introduced into the indoor heat exchangers 31a, 31b, and 31c by means of heat exchange between refrigerants.
  • FIG. 2 illustrates a system diagram of an air conditioner in accordance with another preferred embodiment of the present invention.
  • the cooling/heating selective multi-type air conditioner includes an outdoor unit 50, a distributor 60, and a plurality of indoor units 70a, 70b, and 70c in each room, for operating all the indoor units in a cooling mode, or heating mode.
  • the outdoor unit 50 includes a compressor 51, an outdoor heat exchanger 52, an outdoor fan 53 on one side of the outdoor heat exchanger, a switching device 55 for switching a compressed refrigerant flow from the compressor 51 to the outdoor heat exchanger or the distributor selectively proper to operation modes, and an accumulator 54 on a refrigerant pipeline connected to a suction end of the compressor 51 for separating vapor phase refrigerant from liquid phase refrigerant.
  • the outer unit 50 is connected to the distributor 60 by the switching device 55 through a first pipeline 61 for guiding high pressure refrigerant from the compressor 51 to the distributor through the outdoor heat exchanger 52, a second refrigerant pipeline 62 having one end connected to a refrigerant pipeline connected to a discharge end of the compressor 51 for guiding the refrigerant from the compressor 51 to the distributor 60 directly, and a third refrigerant pipeline 63 connected between the distributor 60 and the suction end of the compressor 51.
  • Each of the indoor units includes an indoor heat exchanger 71a, 71b, or 71c, and an expansion device 72a, 72b, or 72c for expanding refrigerant introduced into the indoor heat exchanger to a preset state in a cooling mode.
  • the distributor 60 is designed such that the refrigerant is guided from the first connection pipeline 61 to the expansion device 72a, 72b, or 72c of the indoor unit directly if all the indoor units 70a, 70b, and 70c are operated in the cooling mode, and the refrigerant is guided from the first connection pipeline 62 to the indoor heat exchanger 71a, 71b, or 71c of the indoor unit directly if all the indoor units 70a, 70b, and 70c are operated in the heating mode.
  • the distributor 60 includes first refrigerant branch pipelines 61a, 61b, and 61c branched from the first refrigerant pipeline 61 as many as a number of the indoor units 70a, 70b, and 70c, and connected to the indoor unit expansion devices 72a, 72b, and 72c respectively, second refrigerant branch pipelines 62a, 62b, and 62c branched from the second refrigerant pipeline 62 and connected to the indoor heat exchangers 71a, 71b, and 71c of the indoor units respectively, and an electronic shut off valves 64 at a position before the second refrigerant pipeline 62 is branched to the second refrigerant branch pipelines.
  • the third refrigerant pipeline 63 is connected to the other end of the second refrigerant pipeline 62.
  • the electronic shut off valve 64 on the second refrigerant branch pipeline 62 is closed, such that the refrigerant flows from the compressor 51 to the expansion devices 72a, 72b, and 72c through the first refrigerant branch pipelines 61a, 61b, and 61c connected to the first refrigerant pipeline 61 and the indoor units 70a, 70b, and 70c by the switching device 55, and expands at the expansion devices 72a, 72b, and 72c, and is drawn into the compressor 51 through the indoor heat exchanger 71 a, 71b, and 71c, the second refrigerant branch pipelines 62a, 62b, and 62c, and the third refrigerant pipeline 63.
  • the electronic shut off valve 64 on the second refrigerant branch pipeline 62 is opened, such that the refrigerant flows from the compressor 51 to the indoor heat exchangers 71 a, 71 b, and 71c through the second refrigerant branch pipelines 61 a, 61b, and 61c connected to the second refrigerant pipeline 62 and the indoor units 70a, 70b, and 70c by the switching device 55, heat exchanges at the indoor heat exchangers 71a, 71b, and 71c, and is drawn into the compressor 51 through the expansion devices 72a, 72b, and 72c, the first refrigerant branch pipelines 61a, 61b, and 61c, and the first refrigerant pipeline 61.
  • the heating/cooling selective multi-type air conditioner further includes a subcooling device 100 on the first refrigerant pipeline 21 connected between the outdoor heat exchanger 12 and the distributor 20.
  • the subcooling device 100 subcools the refrigerant passed through a heat exchange process at the outdoor heat exchanger 52 under an isobaric condition, and guides to the distributor, i.e., expands a portion of the refrigerant from the outdoor heat exchanger 52, makes the expanded refrigerant to heat exchange with rest of the refrigerant discharged from the outdoor heat exchanger, and flowing toward the distributor 60 following the first refrigerant pipeline 61, and introduce into the third refrigerant pipeline 63 connected between the distributor 60 and the suction end of the compressor 51.
  • a system of the subcooling device 100 applied to the concurrent, or selective heating/cooling multi-type air conditioner will be described with reference to FIGS. 3 ⁇ 5.
  • the subcooling device 100 includes a subcooling heat exchanger 110, an expansion device 120, and connection pipes to the subcooling heat exchanger.
  • the subcooling device 100 includes a subcooling heat exchanger 110 for heat exchange between a portion of refrigerant expanded and rest of refrigerant not expanded, a first connection pipeline 131 having the expansion device 120 for expanding the portion of refrigerant passed through a heat exchange process at the outdoor heat exchanger, and connected to the first refrigerant pipeline 21, or 61 for guiding expanded refrigerant to the subcooling heat exchanger 110, a second connection pipeline 132 for guiding the refrigerant not expanded to the subcooling heat exchanger 110, a third connection pipeline 133 for guiding the unexpanded refrigerant passed through, heat exchanged, and subcooled at the subcooling heat exchanger 110 to the distributor 20 or 60, and a fourth connection pipeline 134 for guiding the expanded refrigerant passed through, and heat exchanged at the subcooling heat exchanger to the third refrigerant pipeline connected to the suction end of the compressor 11 or 51.
  • the subcooling heat exchanger 110 has flow passages designed to introduce the refrigerant from the outdoor heat exchanger 12 or 52 in a plurality of paths.
  • the subcooling heat exchanger 110 includes a first flow pipeline 111 having one end connected to the second connection pipeline 132, and the other end connected to the third connection pipeline 133 for flow of the unexpanded high temperature refrigerant, and a second flow pipeline 112 having one end connected to the first connection pipeline 131, and the other end connected to the fourth connection pipeline 134, for heat exchange with the first flow pipeline 111, and flow of the low temperature expanded refrigerant.
  • the subcooling heat exchanger 110 has a double pipe structure with an inner flow pipe and an outer flow pipe on an outside of the inner flow pipe, for improving a heat exchange efficiency of the refrigerant.
  • the inner flow pipe is the second flow pipeline 112
  • the outer flow pipe is the first flow pipeline 111, for flow of the expanded low temperature refrigerant in the inner flow pipe 112, and the high temperature refrigerant discharged from the outdoor heat exchanger 12 or 52 in the outer flow pipe 111, to prevent dew from forming on a surface of the subcooling heat exchanger 110.
  • the outer flow pipe of the subcooling heat exchanger 110 can be connected to the first connection pipeline 131, and the second connection pipeline 132 can be connected to the second connection pipeline 132.
  • the outer flow pipeline has the relatively low temperature refrigerant flowing therein, it is liable that dew is formed on the surface of the subcooling heat exchanger 110.
  • the subcooling heat exchanger 110 may have a variety of structures as far as the structure brings the two flow pipes 111, and 112 into contact.
  • the subcooling heat exchanger may have a structure in which the second flow pipe winds the first flow pipe several times.
  • the two flow pipes 111, and 112 are formed of a material having a good thermal conductivity.
  • the fourth connection pipeline 134 is connected to a predetermined position of the third refrigerant pipeline 23, and 63 which is connected to the inlet of the accumulator 14 or 54.
  • connection pipeline 134 can be connected to the third refrigerant pipeline 23 between the compressor 11, or 51, and the accumulator 14, or 54. Since the refrigerant is expanded to a substantially gas state, even though the refrigerant is introduced into the compressor 11, or 51, stability of the compressor 11, or 51 is not harmed much.
  • first to fourth pipelines 131, 132, 133, and 134 are connected to the subcooling heat exchanger 110 such that the high temperature refrigerant flowing in the first flow pipeline 111 has a flow direction opposite to a flow direction of the low temperature expanded refrigerant, for enhancing a heat exchange efficiency.
  • first to fourth pipelines 131, 132, 133, and 134 are connected to the subcooling heat exchanger 110 such that the high temperature refrigerant flowing in the first flow pipeline 111 has a flow direction opposite to a flow direction of the low temperature expanded refrigerant.
  • the inner flow pipe of the subcooling heat exchanger has a heat exchange part 113a, or 113b for making a heat exchange area larger.
  • the heat exchange part 113a, or 113b are inward projections from the inner flow pipe, the second flow pipe 112, for preventing an increase of flow resistance of the refrigerant flowing along the first flow pipeline 111, and increasing a heat exchange area of the refrigerant flowing through the second flow pipeline 112.
  • the heat exchange part 113a, or 113b may be formed both on the inside/outside walls of the inner flow pipe, or both on the inside/outside of the inner flow pipe, and on an inside wall of the outer flow pipeline.
  • the heat exchange part 113a, or 113b may be formed on the inside wall surface of the inner flow pipe in a form of a ring along a circumferential direction, or as shown in FIG 4, in a form of a helix along the flow direction, or as shown in FIG 5, in a form thin, and extended along the flow direction of the refrigerant.
  • Those structures enable to increase the thermal efficiency of the refrigerant, while decreasing a flow resistance of the expanded refrigerant.
  • the subcooling device 100 with the subcooling heat exchanger 110 is mounted on an inside of the outdoor unit 10 or 50.
  • a length of the first refrigerant pipeline 21 or 61 between the subcooling device 100 and the outdoor heat exchanger 12 or 52 is made shorter, to make the refrigerant from the outdoor heat exchanger 12 or 52 heat exchange, for preventing expansion of a portion of the refrigerant in the first refrigerant pipeline 21, and subcooled liquid refrigerant is supplied to the distributor 20, for minimizing pressure drop of the refrigerant at the first refrigerant pipeline 21, or 61.
  • the subcooling heat exchanger 110 has a length of 1 ⁇ 2.5m, for adequate heat exchange of the low temperature refrigerant expanded at the expansion device 120 on the first connection pipeline 131 and the unexpanded refrigerant flowing through the second connection pipeline at the subcooling heat exchanger 110.
  • the refrigerant compressed to a high pressure at, and discharged from the compressor 11 is introduced into the outdoor heat exchanger 12 by the switching device 15.
  • the high pressure refrigerant heat exchanges with the outdoor air, and condenses as the outdoor fan 13 rotates, and discharged to the first refrigerant pipeline 21 connected to the subcooling device 100.
  • a portion of the refrigerant introduced into the subcooling device 100 following the first refrigerant pipeline 21 is expanded to a low temperature refrigerant by the expansion device 120 on the first connection pipeline 131, and flows through the second flow pipeline 112, rest of the refrigerant introduced into the subcooling device 100 following the first refrigerant pipeline 21 is introduced into the first flow pipeline 111 by the second connection pipeline 132, to heat transfer to each other, such that the refrigerant flowing through the first flow pipeline 111 is subcooled under an isobaric state.
  • the refrigerant from the first flow pipeline 111 of the subcooling heat exchanger 110 is introduced into the distributor 20 through the third connection pipeline 133 and the first refrigerant pipeline 21 in an unexpanded state, guided to the indoor units 30b, and 30c through the first refrigerant branch pipelines 21b and 21c connected to the indoor units operative in the cooling mode, passes through an expansion process and heat exchange process to cool respective rooms, is drawn into the compressor 11 through the third refrigerant branch pipeline 23b, and 23c, the third refrigerant pipeline 23, and the accumulator 14.
  • the refrigerant from the second flow pipeline 112 of the subcooling heat exchanger 110 is introduced into the accumulator 14 guided by the fourth connection pipeline 134 and the third connection pipeline 23, separated into gaseous refrigerant and liquid refrigerant, and drawn into the compressor 11.
  • a portion of the refrigerant from the compressor 11 is introduced into the distributor 20 directly without passing through the outdoor heat exchanger 12, and introduced into the indoor unit 30a through the second refrigerant branch pipeline 22a connected to the indoor unit 30a operative in the heating mode, passes through a heat exchange process to heat the room, and joins with the refrigerant flowing through the first refrigerant pipeline following through the first refrigerant branch pipeline 21a connected to the indoor unit operative in the heating mode.
  • FIG 6 illustrates a P-h diagram of a refrigerating cycle of a multi-type air conditioner of the present invention.
  • the air conditioner of the present invention has the following advantages.
  • the noise occurred at the time of expansion of the refrigerant at the expansion device of the indoor unit can be minimized owing to introduction of the subcooled high pressure refrigerant thereto.
  • the minimized pressure drop of the refrigerant introduced into the indoor unit permits to minimize a capacity of the compressor provided to the air conditioner, enabling to save a production cost, and minimize a volume of the air conditioner.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Other Air-Conditioning Systems (AREA)
EP04018471A 2004-01-27 2004-08-04 Conditionneur d'air Expired - Lifetime EP1559969B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0005045A KR100539570B1 (ko) 2004-01-27 2004-01-27 멀티공기조화기
KR2004005045 2004-01-27

Publications (2)

Publication Number Publication Date
EP1559969A1 true EP1559969A1 (fr) 2005-08-03
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EP2196746A3 (fr) * 2008-12-11 2015-01-28 Fujitsu General Limited Appareil de réfrigération

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KR101645183B1 (ko) * 2010-03-04 2016-08-03 엘지전자 주식회사 멀티형 공기조화기
KR101910658B1 (ko) * 2011-07-18 2018-10-23 삼성전자주식회사 멀티형 공기조화기
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KR101877986B1 (ko) * 2011-10-27 2018-07-12 엘지전자 주식회사 공기조화기
CN103615838B (zh) * 2013-12-05 2016-04-13 中国扬子集团滁州扬子空调器有限公司 内外换热器容积比可变的制冷/制热系统
CN107110624B (zh) * 2015-01-07 2021-04-30 三菱电机株式会社 制冷剂分配器、其制造方法、其制造装置
JP2019163866A (ja) * 2018-03-19 2019-09-26 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置およびそれを備えた温水生成装置
CN109357429A (zh) * 2018-09-21 2019-02-19 青岛海尔空调电子有限公司 一种热回收多联机冷暖切换装置、多联机及控制方法

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EP2054672A2 (fr) * 2006-10-17 2009-05-06 LG Electronics Inc. Climatiseur
EP2054672A4 (fr) * 2006-10-17 2014-04-09 Lg Electronics Inc Climatiseur
EP2196746A3 (fr) * 2008-12-11 2015-01-28 Fujitsu General Limited Appareil de réfrigération
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Also Published As

Publication number Publication date
KR100539570B1 (ko) 2005-12-29
JP2005214613A (ja) 2005-08-11
CN100523660C (zh) 2009-08-05
US20050160763A1 (en) 2005-07-28
KR20050077139A (ko) 2005-08-01
EP1559969B1 (fr) 2012-01-18
CN1648558A (zh) 2005-08-03

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