WO2008140746A1 - Refroidisseur évaporatif et système de conditionnement d'air par compression de vapeur assistée par déshydratant - Google Patents

Refroidisseur évaporatif et système de conditionnement d'air par compression de vapeur assistée par déshydratant Download PDF

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Publication number
WO2008140746A1
WO2008140746A1 PCT/US2008/005920 US2008005920W WO2008140746A1 WO 2008140746 A1 WO2008140746 A1 WO 2008140746A1 US 2008005920 W US2008005920 W US 2008005920W WO 2008140746 A1 WO2008140746 A1 WO 2008140746A1
Authority
WO
WIPO (PCT)
Prior art keywords
airstream
tubes
condenser
evaporative cooler
evaporator
Prior art date
Application number
PCT/US2008/005920
Other languages
English (en)
Inventor
Mohinder S. Bhatti
Llya Reyzin
Shrikant M. Joshi
Original Assignee
Delphi Technogies, 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 Delphi Technogies, Inc. filed Critical Delphi Technogies, Inc.
Priority to CN200880015492A priority Critical patent/CN101680701A/zh
Priority to EP08754271A priority patent/EP2156116A1/fr
Priority to JP2010507465A priority patent/JP2010526981A/ja
Publication of WO2008140746A1 publication Critical patent/WO2008140746A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1411—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant
    • F24F3/1423—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant with a moving bed of solid desiccants, e.g. a rotary wheel supporting solid desiccants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/153—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with subsequent heating, i.e. with the air, given the required humidity in the central station, passing a heating element to achieve the required temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/1016—Rotary wheel combined with another type of cooling principle, e.g. compression cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/1032—Desiccant wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/1056—Rotary wheel comprising a reheater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/1068—Rotary wheel comprising one rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/1084—Rotary wheel comprising two flow rotor segments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00—Air-humidification, e.g. cooling by humidification

Definitions

  • the subject invention relates generally to an air conditioning system.
  • Known air conditioning systems include an evaporator assembly and a condenser assembly cooperating to cyclically evaporate and condense a refrigerant.
  • the evaporator assembly includes a plurality of evaporator tubes carrying a refrigerant and an evaporator fan for moving ambient air across the evaporator tubes. Heat transfers from the air to the refrigerant, thereby evaporating the refrigerant and producing a conditioned airstream.
  • the condenser assembly includes a plurality of condenser tubes in fluid communication with the evaporator tubes.
  • a condenser fan moves ambient air over the condenser tubes, and heat transfers from the refrigerant to the ambient air, thereby condensing the refrigerant and producing an exhaust airstream.
  • the exhaust airstream is typically rejected to the atmosphere.
  • the system also includes a compressor for compressing the refrigerant into a superheated vapor prior to entering the condenser, and an expansion device for reducing pressure on the refrigerant to produce a sub-cooled liquid prior to entering the evaporator. [0003]
  • This system requires a significant amount of energy input. The greater the difference between the ambient air and the desired temperature of the conditioned air, the faster the refrigerant must cycle through the system, in order to continue exchanging the heat. Much of the energy required is used in the compressor.
  • the two types of cooling load on an air conditioning system are the sensible load, and the latent load.
  • the sensible load is the energy required to reduce the dry bulb temperatu of the conditioned air. Sensible load is so named because the temperature difference can be sensed, or detected, by an observer (e.g. a thermometer, or a person occupying the cooled space).
  • the latent load is the energy required to condense water vapor in the ambient air onto the evaporator surface. As the water vapor condenses on the cold evaporator surface, it releases thermal energy, which is absorbed by the refrigerant inside the evaporator tubes.
  • the invention provides for an air conditioning system including ⁇ an ⁇ evaporator assembly.
  • the evaporator assembly include a plurality of evaporator tubes ' ofor carrying a refrigerant, and a condenser assembly including a plurality of condenser tubes in fluid communication with the evaporator tubes.
  • a condenser fan moves ambient air over the condenser tubes, and heat transfers from the refrigerant to the ambient air to condense the refrigerant and to produce an exhaust airstream.
  • An evaporative cooler assembly defines, a primary channel for receiving an incoming airstream and for producing an evaporatively cooled airstream.
  • a desiccant wheel has a solid desiccant material and a housing supporting the solid desiccant material.
  • a first air inlet is in airflow communication with the evaporative cooler assembly for receiving the evaporatively cooled airstream and for directing the evaporatiyely cooled airstream through a first sector of the housing.
  • An exothermic reaction between the solid desiccant material and the evaporatively cooled airstream occurs to dry the evaporatively cooled airstream to produce a dehumidified airstream.
  • a first outlet is in airflow communication with the evaporator assembly for directing the dehumidified airstream over the evaporator tubes.
  • Figure 1 is a schematic of an air conditioning system according to an exemplary embodiment of the present invention
  • Figure 2 is a perspective view of a desiccant wheel according to the exemplary embodiment of the present invention
  • Figure 3 is a perspective view of an evaporative cooler according to the exemplary embodiment of the present invention.
  • Figure 4 is a psychrometric chart demonstrating the state of the' air'-as ⁇ it cycles through the air conditioning system according to the exemplary embodiment. ⁇ -
  • the evaporated refrigerant leaves the evaporator tubes 24 and heads into'a compressor 28, which compresses the evaporated refrigerant to produce a superheated vapor.r.tA! condenser assembly 30 includes a plurality of condenser tubes 32 spaced apart from one another and in fluid communication with the compressor 28 to receive the superheated vapor.
  • a condenser air passage is defined between the condenser tubes 32.
  • a condenser fan 33 moves ambient air through the condenser air passage over the condenser tubes 32. Heat is transferred from the superheated vapor to the ambient air, to condense the refrigerant into a liquid. The ambient air is heated to produce an exhaust airstream leaving the condenser air passage.
  • an expansion device 34 is in 'fluid communication between the condenser tubes 32 and the evaporator tubes 24.
  • the expansion device 34 decreases the pressure on the liquid to produce a sub-cooled liquid refrigerant for supply back to the evaporator tubes 24.
  • an evaporative cooler assembly 36 is provided.
  • the evaporative cooler assembly 36 includes a plurality of evaporative cooler tubes 38 extending vertically and spaced apart from one another.
  • a plurality of fins 40 extends back and forth between the evaporative cooler tubes 38 to define a primary channel extending along the fins ' 40
  • a plurality of internal dividers " 4-2 extends within the evaporative cooler tubes 38 to define a secondary channel extending perpendicularly to the primary channel.
  • a water tank 44 is disposed about an end of the evaporative cooler tubes 38, and a wicking coating 46 extends along the evaporative cooler tubes 38 for wicking water by capillary action from the water tank 44 into contact with the secondary channel.
  • a first conduit 48 connects the condenser air> passage in airflow communication with the primary channel of the evaporative cooler assembly 36.
  • a first portion of the exhaust airstream flows through the first conduit 48 to the primary channel.
  • a plurality of apertures 50 are disposed along the evaporative cooler tubes 38 for splitting the airstream between the primary and secondary channels. Therefore, a fraction of the first portion of the exhaust airstream enters the apertures 50 and flows into the secondary channel and flows over the wet surfaces.
  • the air in the secondary channel evaporates the water along ⁇ hef sides of the evaporative cooler tubes 38 to produce a moisture-laden airstream.
  • the evaporation draws the latent heat of vaporization away from the first portion of the exhaust airstream Xo produce an evaporatively cooled airstream flowing through the primary channel and having ⁇ lower dry bulb temperature than the ambient air.
  • This cooler airstream lowers the sensible- load ; on the evaporator assembly 22, thereby reducing the cooling load exerted by the system 20.
  • the moisture-laden airstream flowing through the secondary channel can simply exit the evaporative cooler assembly 36 through the openings of the evaporative cooler tubes 38.
  • a desiccant wheel 52 is provided.
  • the desiccant wheel 52 includes a housing 54 having a pair of end plates 56 spaced apart from one another.
  • a plurality of desiccant tubes 58 extend between the end plates 56, and a pair of trunnions 60 each extend from one of the end plates 56 to define an axis Z.
  • a solid desiccant material extends within each of the desiccant tubes 58.
  • the housing 54 of the desiccant wheel 52 includes a first air inlet 62 in airflow communication with the primary channel of the evaporative cooler for receiving the evaporatively cooled airstream.
  • the first air inlet 62 directs ';the evaporatively cooled airstream through a first sector of the desiccant tube 58 to pass over the solid desiccant material.
  • the presence of the evaporatively cooled airstream causes an exothermic reaction with the solid desiccant material.
  • moisture from the evaporatively cooled airstream is adsorbed by the solid desiccant material, thereby producing'the dehumidified airstream.
  • the reaction is governed according to equation (1), wherein M refers to the solid desiccant material, and the reaction adsorbs n molecules of water vapor nH 2 0 into the solid desiccant material, forming a complex M nH 2 O, and liberating heat Q 0 .
  • This liberated heat can raise the temperature of air flowing through the first section of the desiccant wheel 52. - ⁇ ".' « «_.
  • a first air outlet 64 is provided in airflow communication with the evaporator air passage for directing the dehumidified airstream over the evaporator tubes 24:
  • a second air inlet 66 is in airflow communication with the condenser air passage to receive a second portion of the exhaust airstream.
  • a second conduit 68 connects the condenser air passage with second air inlet 66 for directing the second portion of the exhaust airstream to the desiccant tubes 58.
  • An exhaust flow divider 70 connects the condenser air passage in airflow communication with the first and second conduits 48, 68 for dividing the exhaust airstream into the first portion and the second portion.
  • the exhaust flow divider 70 is a Y-shaped conduit that connects the first and second conduits 48, 68 with the condenser air passage.
  • a heater 72 is provided in airflow- communication between the condenser air passage and the second air inlet 66 of the desiccaht wheel 52 for adding heat to the second portion of the exhaust airstream.
  • the second portion of the exhaust airstream is directed from the second air inlet 66 through a second sector of the desiccant tubes 58.
  • an endothermic reaction results, which removes the water vapor molecules from the solid desiccant material. This reaction is governed according to equation (2), where the heat from the second portion of the exhaust airstream replaces the heat Q 0 liberated during the exothermic reaction:
  • a second air outlet 74 is provided to discharge the second portion of the exhaust airstream after the endothermic reaction.
  • the desiccant wheel 52 is supported by the trunnions 60 for rotation' about the axis Z to alternately move the solid desiccant material between the first and second sectors to successively expose the solid desiccant material to the second portion of the exhaust airstream and to the evaporatively cooled airstream.
  • This cycle allows the solid desiccant material to be continually used and regenerated.
  • the desiccant wheel 52 rotates at a speed of about 5 - 6 RPM.
  • the amount of moisture that can be absorbed by the desiccant wheel 52 is proportional to the rotational speed, so the humidity of the dehumidified airstream can be controlled simply by altering the speed.
  • FIG. 4 the psychrometric properties of air flowing through the system 20 are shown.
  • the letters designating points throughout the psychrometric chart of Figure 4 correspond to positions within the system 20 of Figure 1.
  • ambient air enters the system 20 at point A, having an ambient temperature T 1 and an absolute humidity O 1 .
  • the ambient air is heated in the condenser air passage, and leaves as exhaust airstream at point iB; having the same absolute humidity, and an increased temperature T s , which increases the water vapor uptake capacity of air both in the evaporative cooler assembly 36 and the desiccant wheel 52.
  • the first portion of the exhaust airstream then flows into the evaporative cooler and exits as the evaporatively cooled airstream at point C, having the same absolute humidity and reduced temperature T p .
  • the moisture-laden airstream exits the evaporative cooler assembly 36 through " the secondary channel at point D, having a slightly lower temperature T SE> due to direct evaporative cooling in the secondary channels, and increased absolute humidity ⁇ s .
  • the evaporatively cooled airstream in the primary channels then flows into the desiccant wheel 52 and exits as the dehumidified airstream at point E with an increased temperature that does not exceed the ambient temperature T 1 , and a lower absolute humidity ⁇ 0 .
  • the dehumidified airstream then enters the evaporator air passage and is further cooled to point F, having the same absolute humidity and lower temperature T e .
  • the second portion of the exhaust airstream- leave ⁇ the condenser air passage and enters the heater 72.
  • the second portion of the exhaust airstream exits the heater 72 at point G, having the same absolute humidity ⁇ ,, and an increased temperature T d .
  • the second portion of the exhaust airstream then enters the desiccant wheel 52 to dry the solid desiccant material, receives the moisture from the solid desiccant material, and exits the desiccant wheel 52 at point H, having substantially the same temperature T d , and higher absolute humidity cod.
  • the air conditioning system 20 utilizes the waste heat from the condenser airstream to increase the water vapor uptake capacity of air. Additionally, the condenser fan 33 performs multiple functions, including directing air through the condenser assembly 30, evaporative cooler assembly 36, and the desiccant wheel 52, rather than using a separate fan for each assembly.
  • the higher water vapor uptake capacity of air flowing through the first conduit 48 and into the evaporative cooler assembly 36 increases the evaporation rate of water in the secondary channel. A higher evaporation rate translates into a more efficient evaporative cooling process.
  • the higher water vapor uptake capacity of air flowing through the second conduit 68 increasestHe desiccant material regeneration rate by absorbing a greater amount of moisture from the solid desiccant material. Both of these factors increase the overall efficiency of the air conditioning system 20.
  • the evaporatively cooled airstream leaving the primary channel of the evaporative cooler assembly 36 absorbs the heat of the exothermic reaction occurring within the desiccant wheel 52 thereby delivering the dehumidified air to the evaporator assembly 22 at or below ambient air temperature T 1 .
  • the evaporative cooler assembly 36 operating in conjunction with the desiccant wheel 52 completely handles the latent load of the evaporator assembly -22 with the expenditure of waste heat only, thereby increasing the overall efficiency of the air conditioning system 20.
  • the load reduction achieved by the use of this waste heat could be substantial, typically amounting to about 40% of the total load.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Central Air Conditioning (AREA)
  • Drying Of Gases (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un système de conditionnement d'air qui comprend un ensemble d'évaporateur et un ensemble de condenseur. Une première partie du flux d'air d'échappement quitte le condenseur et entre dans un canal primaire d'un ensemble de refroidisseur par évaporation. De l'eau s'évapore des tubes de refroidisseur par évaporation et crée un flux d'air chargé d'humidité. Une pluralité d'ouvertures dans les tubes de refroidisseur par évaporation déchargent le flux d'air chargé d'humidité dans un canal secondaire défini à l'intérieur des tubes de refroidisseur par évaporation. La chaleur extraite de l'air dans le canal primaire produit un flux d'air refroidi par évaporation qui entre dans une roue déshydratante. Un matériau déshydratant solide à l'intérieur de la roue déshydratante absorbe l'humidité provenant du flux d'air refroidi par évaporation pour produire un flux d'air déshumidifié qui entre dans l'ensemble d'évaporateur. Une seconde partie du flux d'air d'échappement est dirigée à travers un dispositif de chauffage puis à l'intérieur de la roue déshydratante pour fournir de la chaleur pour une régénération du matériau déshydratant solide.
PCT/US2008/005920 2007-05-10 2008-05-07 Refroidisseur évaporatif et système de conditionnement d'air par compression de vapeur assistée par déshydratant WO2008140746A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN200880015492A CN101680701A (zh) 2007-05-10 2008-05-07 蒸发冷却器和干燥剂辅助的蒸汽压缩空调系统
EP08754271A EP2156116A1 (fr) 2007-05-10 2008-05-07 Refroidisseur évaporatif et système de conditionnement d'air par compression de vapeur assistée par déshydratant
JP2010507465A JP2010526981A (ja) 2007-05-10 2008-05-07 蒸発冷却器及び乾燥剤補助蒸気圧縮空調システム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/801,545 US20080276640A1 (en) 2007-05-10 2007-05-10 Evaporative cooler and desiccant assisted vapor compression AC system
US11/801,545 2007-05-10

Publications (1)

Publication Number Publication Date
WO2008140746A1 true WO2008140746A1 (fr) 2008-11-20

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ID=39968299

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/005920 WO2008140746A1 (fr) 2007-05-10 2008-05-07 Refroidisseur évaporatif et système de conditionnement d'air par compression de vapeur assistée par déshydratant

Country Status (5)

Country Link
US (1) US20080276640A1 (fr)
EP (1) EP2156116A1 (fr)
JP (1) JP2010526981A (fr)
CN (1) CN101680701A (fr)
WO (1) WO2008140746A1 (fr)

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US8141374B2 (en) 2008-12-22 2012-03-27 Amazon Technologies, Inc. Multi-mode cooling system and method with evaporative cooling
KR101184925B1 (ko) * 2009-09-30 2012-09-20 한국과학기술연구원 액체식 제습장치용 열물질교환기 및 그를 이용한 액체식 제습장치
US20110088417A1 (en) * 2009-10-19 2011-04-21 Kayser Kenneth W Energy Recovery Ventilator And Dehumidifier
US8141379B2 (en) * 2010-12-02 2012-03-27 King Fahd University Of Petroleum & Minerals Hybrid solar air-conditioning system
WO2013026255A1 (fr) * 2011-08-25 2013-02-28 Ma Jun Conditionneur d'air de type à compression de vapeur de réfrigération combinée à une déshumidification par roue déshydratante
EP2772696B1 (fr) * 2011-10-28 2020-07-15 Mitsubishi Electric Corporation Dispositif de réfrigération et de climatisation
US20130186593A1 (en) * 2012-01-20 2013-07-25 Synairco, Inc. Split-air flow cooling and dehumidification system
US9170053B2 (en) * 2013-03-29 2015-10-27 Tokitae Llc Temperature-controlled portable cooling units
US11105556B2 (en) 2013-03-29 2021-08-31 Tokitae, LLC Temperature-controlled portable cooling units
ES2759926T3 (es) * 2013-06-12 2020-05-12 7Ac Tech Inc Sistema de aire acondicionado desecante líquido
CN106227266A (zh) * 2016-08-31 2016-12-14 广东维中检测技术有限公司 土壤烘干机的外置温控器
CN110337321B (zh) * 2017-02-23 2021-11-09 三菱电机株式会社 除湿机
CN108100263A (zh) * 2017-12-03 2018-06-01 中国直升机设计研究所 一种直升机综合环控系统

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US4887438A (en) * 1989-02-27 1989-12-19 Milton Meckler Desiccant assisted air conditioner
US5579647A (en) * 1993-01-08 1996-12-03 Engelhard/Icc Desiccant assisted dehumidification and cooling system
US6029467A (en) * 1996-08-13 2000-02-29 Moratalla; Jose M. Apparatus for regenerating desiccants in a closed cycle
US6776001B2 (en) * 2000-02-07 2004-08-17 Idalex Technologies, Inc. Method and apparatus for dew point evaporative product cooling

Also Published As

Publication number Publication date
CN101680701A (zh) 2010-03-24
JP2010526981A (ja) 2010-08-05
EP2156116A1 (fr) 2010-02-24
US20080276640A1 (en) 2008-11-13

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