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WO2003016795A1 - Condenser, evaporator, and cooling device - Google Patents

Condenser, evaporator, and cooling device Download PDF

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Publication number
WO2003016795A1
WO2003016795A1 PCT/US2002/024191 US0224191W WO03016795A1 WO 2003016795 A1 WO2003016795 A1 WO 2003016795A1 US 0224191 W US0224191 W US 0224191W WO 03016795 A1 WO03016795 A1 WO 03016795A1
Authority
WO
WIPO (PCT)
Prior art keywords
vaporizing
refrigerant
inlet
evaporator
outlet
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.)
Ceased
Application number
PCT/US2002/024191
Other languages
French (fr)
Inventor
David M. Berchowitz
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.)
Global Cooling BV
Original Assignee
Global Cooling BV
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 Global Cooling BV filed Critical Global Cooling BV
Priority to HK04109045.2A priority Critical patent/HK1066264B/en
Priority to US10/474,403 priority patent/US7073567B2/en
Priority to DE10297119T priority patent/DE10297119B4/en
Publication of WO2003016795A1 publication Critical patent/WO2003016795A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0475—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F28F9/002—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core with fastening means for other structures
    • 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
    • F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
    • F25B23/006—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect boiling cooling systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/007—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0071—Evaporators

Definitions

  • the present invention relates to a cooling device, more particularly to a condenser that rejects heat of a refrigerant to the heat absorption portion of an exterior refrigerator and liquefies it, an evaporator that absorbs heat from an object to be cooled and vaporizes the refrigerant, and a cooling device including the condenser and the evaporator.
  • a cooling means having the following configuration and shown in Fig.10, has been proposed.
  • An exterior refrigerator is spaced apart from an object 92 to be cooled, and a refrigerant are circulated between the heat absorption portion 91 of the exterior refrigerator and the object 92 to be cooled. That is, the refrigerant is cooled at a heat reject portion 51 attached to the heat absorption portion 91 of the exterior refrigerator, then being introduced through a passage 55 to a heat absorption portion 52 provided in contact with the object 92 to be cooled, thereby the object 92 is cooled.
  • the refrigerant warmed at the heat absorption portion 52 is circulated back to the heat reject portion 51 through a passage 56.
  • the heat reject portion 51 is thermally coupled with the heat absorption portion 91 of the exterior refrigerator in such a configuration that a refrigerant pipe is wound around or laid along the heat absorption portion 91 of the exterior refrigerator.
  • the heat absorption portion 52 is thermally coupled with the object 92 in the same configuration as well.
  • the above cooling means by its nature, needs enhancing either the heat transfer performance between the heat absorption portion 91 of the exterior refrigerator and the heat reject portion 51 or that between the object 92 to be cooled and the heat absorption portion 52 in order to improve its cooling efficiency.
  • cooling means size reduction of the cooling means is required as well.
  • the cooling means in which as the object 92 to be cooled is extremely small with only a small amount of heat generated, the exterior refrigerator is small, the heat reject portion 51 fixed to the heat absorption portion 91 thereof has to be small, and so does the heat absorption portion 52 fixed to the object 92.
  • both the size reduction of either the heat reject portion 51 or the heat absorption portion 52 and the increases of their heat transfer performance are important.
  • the cooling means also requires simple and easy means for attaching the heat reject portion 51 to the heat absorption portion 91 of the exterior refrigerator or detaching it therefrom and that for attaching the heat absorption portion 52 to the object 92 to be cooled or detaching it therefrom without sacrificing its heat transfer performance .
  • an object of the present invention is to provide a compact condenser and evaporator with an efficient heat transfer performance and with easy maintenance and to provide a cooling device having including the compact condenser and evaporator.
  • the condensing portion is formed of a flat plate shaped so as to surround the entire periphery of the column-like shaped heat absorption portion.
  • the condensing portion further has a plurality of through holes formed along the circumferential direction thereof and arranged in parallel with each other.
  • the inlet and outlet portions being hollow tubes have a closed end and an open end respectively.
  • the inlet portion is connected to one end face of the condensing portion that is perpendicular to the circumferential direction of the condensing portion.
  • the inlet portion communicates with all of the through holes.
  • the outlet portion is connected to the other end face of the condensing portion that is perpendicular to the circumferential direction of the condensing portion.
  • the outlet portion communicates with all of the through holes.
  • the open end of the inlet portion is connected to an inflow passage of the refrigerant .
  • the open end of the outlet portion is connected to an outflow passage of the refrigerant which section area is smaller than that of the inflow passage.
  • the condensing portion is inserted into and fixed to the column-like shaped heat absorption portion.
  • the end faces of the condensing portion that are perpendicular to the circumference thereof not only means those formed by dividing the entire circumference thereof into two semicircles, but also means those formed by cutting the condensing portion at one portion on its circumference.
  • the present invention provides the following functions and effects. Namely, if temperature of a refrigerant is merely lowered at a heat-rejecting portion, no more than the amount of heat is rejected which corresponds to • the multiplier of the heat capacity of the refrigerant by the temperature differentials of the refrigerant.
  • the present invention enables to reject a larger amount of heat by condensing a refrigerant vapor at a condensing portion, to achieve a highly effective heat transfer.
  • the condensing portion is configured so that the entire periphery of the column-like shaped heat absorption portion is surrounded with a flat plate having a number of narrow through holes arranged. Accordingly, while the heat transfer area can be larger, the heat absorption portion and the heat condensing portion attached thereto can be smaller.
  • the condensing portion is attached only by inserting it to the column-like shaped heat absorption portion, attachment and detachment can be easier, and assembling and maintenance workability is improved without impairing its heat transfer performance.
  • the section area of the outflow passage of the refrigerant is smaller than that of the inflow passage, because as the volume of the vaporized refrigerant drastically decreases by condensing, smaller section area is enough for the outflow passage.
  • the condenser in the first aspect thereof is further provided with a clamp formed so as to surround the condensing portion, inserted into the column-like shaped heat absorption portion, and attached to it by fastening the clamp.
  • the condensing portion either in the first or second aspect thereof is comprised of a plurality of hollow tubes that are arranged in parallel with each other.
  • the vaporizing portion is formed of a flat plate provided with a plurality of through holes arranged in parallel with each other.
  • the inlet and outlet portions being hollow tubes have a closed end and an open end respectively.
  • the inlet portion is connected to one end portion of the vaporizing portion at its outer circumferential surface.
  • the inlet portion further communicates with all of the through holes.
  • the outlet portion is connected to the other end portion of the vaporizing portion at its outer
  • the outlet portion further communicates with all of the through holes.
  • the open end of the inlet portion is connected to an inflow passage of the refrigerant .
  • the open end of the outlet portion is connected to an outflow passage of the refrigerant which section area is larger than that of the inflow passage.
  • the vaporizing portion is attached to the exterior heat source.
  • the above-mentioned configuration of the present invention provides following effects.
  • the liquid refrigerant is vaporized at an evaporator, an amount of heat equivalent to the vaporization heat thereof may be absorbed, thereby higher heat transfer performance is achieved.
  • the heat transfer area of the evaporator is enlarged by employing a flat plate with a number of through holes disposed therein in parallel with each other, the evaporator attached to the exterior heat source can be reduced in size.
  • This configuration of the present invention is especially effective for highly integrated small objects such as the CPUs for computer.
  • the evaporator can be easily attached to or detached from objects to be cooled by means of nuts or clamps, assembly, maintenance and inspection thereof can be improved without impairing its heat transfer performance.
  • the section area of the outflow passage of the refrigerant is larger than that of the inflow passage, as volume of the refrigerant increases greatly by the vaporization.
  • the vaporizing portion is formed of a flat plate provided with a plurality of through holes arranged in parallel with each other.
  • the vaporizing portion is bended to insert a space having predetermined height and length between it .
  • the fin is inserted into the space crossing with the through hole direction.
  • the inlet and outlet portions being hollow tubes have a closed end and an open end respectively.
  • the inlet portion is connected to one lower end portion of the vaporizing portion at its outer circumferential surface.
  • the inlet portion further communicates with all of the through holes.
  • the outlet portion is connected to the other higher end portion of the vaporizing portion at its outer circumferential surface.
  • the outlet portion further communicates with all of the through holes.
  • the open end of the inlet portion is connected to an inflow passage of the refrigerant .
  • the open end of the outlet portion is connected to an outflow passage of the refrigerant which section area is larger than that of the inflow passage.
  • the above-mentioned configuration of the present invention provides following effects.
  • the heat transfer area of the evaporator can be enlarged by employing a flat plate with a number of through holes. Further, the evaporator with long length can be small sized by bending it. And further more, the heat transfer area with hot air passing through can be increased by installing the fin between the bended vaporizing portion. Consequently, the evaporator can be small sized, while the heat transfer aria with the refrigerant and the hot air passing through can be increased.
  • the vaporizing portion either in the fourth or fifth aspect thereof is formed of a plurality of hollow tubes arranged in parallel with each other.
  • a cooling device comprising the condenser either in the first, second, or third aspect thereof and the evaporator either in the fourth, fifth or sixth aspect thereof, wherein the outflow passage of the condenser is connected to the inflow passage of the evaporator, and the inflow passage of the condenser is connected to the outflow passage of the evaporator.
  • the above-mentioned configuration of the present invention can reduce the size of the device, enhance cooling efficiency, and improve workability of assembly, maintenance or inspection.
  • Fig.l is a schematic side view of the condenser according to the present invention.
  • Fig .2 is a schematic front view of the condenser according to the present invention.
  • Fig.3 is a schematic enlarged view of the cooling device according to the present invention.
  • Fig.4 is a schematic enlarged perspective view of inlet portions and outlet portions of the cooling device according to the present invention.
  • Fig.5 is a schematic plan view of the evaporator according to the present invention.
  • Fig.6 is a schematic front view of the evaporator according to the present invention.
  • Fig.7 is a schematic perspective view of the evaporator with the thin fin between the bended vaporization portion.
  • Fig.8 is a schematic arrangement view of hollow tubes used for the condenser or the evaporator according to the present invention.
  • Fig.9 is a schematic view of a driving pump of refrigerant according to the present invention.
  • Fig.10 is a schematic view of a conventional cooling means .
  • Fig.l and 2 shows a condenser 10, which condenses a vaporized refrigerant by rejecting heat to a cylindrical heat absorption portion 19 that comprises an exterior cooling device.
  • the condenser 10 is comprised of a condensing portion 11, an inlet portion 12, an outlet portion 13, and a clamp 14.
  • suitable material of which phase changes from a gas to a liquid state is chosen, for example like carbon dioxide.
  • suitable refrigerant and appropriate filling pressures are selected.
  • the condensing portion 11 is comprised of a flat plate of aluminum formed so as to surround the outer periphery of the cylindrical heat absorption portion 19.
  • the flat plate 11 is provided so that a number of through holes 11a are disposed in parallel with each other in the direction of the circumference of the condensing portion 11.
  • the flat plate 11 is divided into two semicircles at two positions of the circumference thereof; end faces lib and lie, which are perpendicular to the circumference of the flat plate 11.
  • the inlet portion 12 is connected to the end face lib of the flat plate 11 so as to communicate with all of the through holes 11a
  • the outlet portion 13 is connected to the end face lie of the flat plate 11 so as to communicate with all of the through holes 11a.
  • the inlet portion 12 and outlet portion 13 are made from aluminum hollow tubes having closed ends 12a, 13a and open ends 12b, 13b, respectively.
  • the slits 12c, 13c are formed on the circumferential surface of the inlet portion 12 and outlet portion 13, respectively, and connected to the end faces lib, lie of the flat plate 11 by brazing. While the open end 12b of the inlet portion 12 is connected by brazing to an inflow passage 15 of the refrigerant formed an aluminum tubes, the open end 13b of the outlet portion 13 is connected by brazing to an outflow passage 16 of the refrigerant.
  • the section area of the outflow passage 16 is smaller than that of the inflow passage 15.
  • the clamp 14 is comprised of an insulator 14c and a band 14a.
  • the insulator 14c is formed of polycarbonate thermoplastic resin in a semicircle shape so as to surround the outer periphery of the condensing portion 11.
  • the band 14a is formed of stainless steel in a cylindrical shape so as to surround the outer surface of the insulator 14c.
  • the condensing portion 11 is inserted into the cylindrical heat absorption portion 19 and fixed thereto in such a manner that the band 14a is fastened by inserting a bolt 17 into through holes formed in the both end portions 14b of the band 14a and screwing it by a nut 18.
  • the insulator 14c of synthetics resin is used as it enable to prevent heat of the outside air from being transmitted to the condensing portion 11 and also enables to utilize elasticity of the synthetics resin in applying uniform radial pressures for fastening the band 14a.
  • the condensing portion 11 may be formed in a circumferential shape and cut at one portion thereon to form two end faces, and then either of those two end faces is connected with either the inlet portion 12 or the outlet portion 13.
  • Fig.5 and 6 shows an evaporator 20, which is comprised of a vaporizing portion 21, an inlet portion 22 and an outlet portion 23, and vaporizes the refrigerant by absorbing heat from an exterior heat source 29.
  • the vaporizing portion 21 is comprised of a flat aluminum plate with a number of through holes 21a provided in parallel with each other.
  • the inlet portion 22 and the outlet portion 23 are formed of hollow aluminum tubes, and have closed ends 22a, 23a and open ends 22b, 23b, respectively.
  • One end portion 21b of the vaporizing portion 21 is connected to the outer surface of the inlet portion 22 by brazing so that all of the through holes 21 communicate therewith.
  • the other end portion 21 c of the vaporizing portion 21 is connected to the outer surface of the outlet portion 23 by brazing so that all of the through holes 21a communicate therewith.
  • the open end 22b of the inlet portion 22 is connected to the inflow passage 25 of the refrigerant by brazing, and the open end 23b of the outlet portion 23 is connected to the outflow passage 26 of the refrigerant by brazing.
  • the section area of the outflow passage 26 is larger than that of the inflow passage 25.
  • the vaporizing portion 21 is inserted into a head block 24 formed of aluminum, and is screwed on the top face of the exterior heat source 29 at its through holes 24a.
  • the vaporizing portion 21 and the head block 24 may be integrally formed into a single-piece member, directly attached on the top face of the exterior heat source 29 by means of a cover for example, instead of the head block 24.
  • Fig.7 shows an evaporator 30 that vaporizes a liquid refrigerant by absorbing heat from air passing through.
  • the evaporator 30 includes a vaporizing portion 31, an inlet portion 32, an outlet portion 33 and fins 34.
  • the vaporizing portion 31 is formed of a aluminum flat plate with a plurality of through holes 31a arranged in parallel with each other. And the, vaporizing portion 31 is bended at three positions and forms three spaces having rectangular cross section between the flat portions of it.
  • the fins 34 are formed to have wave shapes with thin aluminum plate, and inserted into the spaces contacting with the flat surfaces of the vaporizing portion 31 at top position of the wave shapes .
  • the inlet portion 32 and the outlet portion 33 are aluminum hollow tubes having a closed end 32a, 33a and an open end 32b, 33b respectively.
  • the inlet portion 32 is connected to one lower end portion of the vaporizing portion 31 at its outer circumferential surf ce. And the inlet portion 32 communicates with all of the through holes 31a.
  • the outlet portion 33 is connected to the other higher end portion of the vaporizing portion 31 at its outer circumferential surf ce. And the outlet portion 33 communicates with all of the through holes 31a.
  • the open end 32b of the inlet portion 32 is connected to an inflow passage 35 of the refrigerant made from aluminum tube.
  • the open end 33b of the outlet portion 33 is connected to an outflow passage 36 of the refrigerant made from aluminum tube of which section area is larger than that of the inflow passage 35.
  • the liquefied refrigerant flows into the lower position of the vaporizing portion 31 through the inflow passage 35, then gradually vaporizes within the through holes 31a, and finally flow out from the higher position of the vaporizing portion 31 through the outflow passage 36 with larger section area.
  • the bending positions of the vaporizing portion 31 are not limited to three positions, but one, tow and more four bending position are available.
  • the wave shape of the fin 34 is not limited U shape, but V shape and other shapes are available.
  • Fig.8 shows a plurality of hollow tubes 41 arranged and fixed in parallel with each other by brazing. Each of the hollow tubes 41 is made of aluminum and has 1mm in diameter. By employing those hollow tubes 41, either the condensing portion 11 or the vaporizing portion 21, 31 may be manufactured in a simpler manner and at a lower cost .
  • the condenser 10 If the condenser 10 is located in an upper position of the evaporator 20 as shown in Fig.10, the refrigerant can be continuously circulated without an external power by the gravity difference between the liquid refrigerant and the vaporized refrigerant. However, if the condenser 10 is located at an almost same position as the evaporator 20 or at a lower position than the evaporator 20, the refrigerant cannot be circulated without a driving pump.
  • Fig.9 shows a driving pump 60 so called “fish tail pump,” which is known for its compact and simple structure.
  • the driving pump 60 is installed in a refrigerant passage 65, and has a sheet spring 61 supported at the supporting point 63.
  • a small piece of metal such as iron is attached on the sheet spring 61, it is vibrated by an electromagnet 64. Vibration of the sheet spring 61 sends out the refrigerant in such a way that fish moves its tail fin.
  • a small amount of power is enough to send out the refrigerant if the sheet spring 61 is vibrated at its resonance speed .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention provides a compact and inexpensive cooling device with high heat transfer efficiency and with easy maintenance. The cooling device includes a condenser (10), an evaporator (20), and a pair of refrigerant flow passages between them. In each of the condenser (10) and the evaporator (20), through holes (11a, 21a) are formed in parallel with each other. The condenser (10) is formed in a cylindrical shape and installed around the cooling head of the refrigerator by a clamp (14). The evaporator (20) is installed the outside. The refrigerant is liquefied in the condenser (10) by releasing its heat, flows down into the evaporator (20) through the flow passage and is vaporized in the evaporator (20) by absorbing heat from the outside. The vaporized refrigerator flows up and returns into the condenser (10).

Description

Condenser, Evaporator, and Cooling Device
BACKGROUND OF THE INVENTION
The present invention relates to a cooling device, more particularly to a condenser that rejects heat of a refrigerant to the heat absorption portion of an exterior refrigerator and liquefies it, an evaporator that absorbs heat from an object to be cooled and vaporizes the refrigerant, and a cooling device including the condenser and the evaporator.
DESCRIPTION OF THE RELATED ART Various types of cooling devices have been proposed to cool spaces or objects. In some applications, however, it may be difficult to install the heat absorption portion of the cooling devices in proximity to those spaces or objects. An icebox used in a car has a difficulty to directly attach the heat absorption portion thereon due to the limitation of available spaces interior of the car. Warming of the car interior by the heat radiation of the cooling device has to be avoided as well. In cooling the CPU of the computer where many associated parts are arranged in narrow spaces, installation of cooling devices near the CPU is further difficult.
In order to resolve such difficulties in installation of cooling devices, a cooling means, having the following configuration and shown in Fig.10, has been proposed. An exterior refrigerator is spaced apart from an object 92 to be cooled, and a refrigerant are circulated between the heat absorption portion 91 of the exterior refrigerator and the object 92 to be cooled. That is, the refrigerant is cooled at a heat reject portion 51 attached to the heat absorption portion 91 of the exterior refrigerator, then being introduced through a passage 55 to a heat absorption portion 52 provided in contact with the object 92 to be cooled, thereby the object 92 is cooled. The refrigerant warmed at the heat absorption portion 52 is circulated back to the heat reject portion 51 through a passage 56.
In the above cooling means, the heat reject portion 51 is thermally coupled with the heat absorption portion 91 of the exterior refrigerator in such a configuration that a refrigerant pipe is wound around or laid along the heat absorption portion 91 of the exterior refrigerator. The heat absorption portion 52 is thermally coupled with the object 92 in the same configuration as well. The above cooling means, by its nature, needs enhancing either the heat transfer performance between the heat absorption portion 91 of the exterior refrigerator and the heat reject portion 51 or that between the object 92 to be cooled and the heat absorption portion 52 in order to improve its cooling efficiency.
Further, size reduction of the cooling means is required as well. In the application of the cooling means to the computer CPU or the like, in which as the object 92 to be cooled is extremely small with only a small amount of heat generated, the exterior refrigerator is small, the heat reject portion 51 fixed to the heat absorption portion 91 thereof has to be small, and so does the heat absorption portion 52 fixed to the object 92. In summary, both the size reduction of either the heat reject portion 51 or the heat absorption portion 52 and the increases of their heat transfer performance are important.
The cooling means also requires simple and easy means for attaching the heat reject portion 51 to the heat absorption portion 91 of the exterior refrigerator or detaching it therefrom and that for attaching the heat absorption portion 52 to the object 92 to be cooled or detaching it therefrom without sacrificing its heat transfer performance .
Accordingly, an object of the present invention is to provide a compact condenser and evaporator with an efficient heat transfer performance and with easy maintenance and to provide a cooling device having including the compact condenser and evaporator.
SUMMARY OF THE INVENTION
In accordance with a first aspect of the present invention, a condenser that condenses a refrigerant gas by rejecting heat of the gas to a predetermined column-like shaped heat absorption portion of an exterior cooling device includes a condensing portion, an inlet portion, and an outlet portion. The condensing portion is formed of a flat plate shaped so as to surround the entire periphery of the column-like shaped heat absorption portion. The condensing portion further has a plurality of through holes formed along the circumferential direction thereof and arranged in parallel with each other. The inlet and outlet portions being hollow tubes have a closed end and an open end respectively. The inlet portion is connected to one end face of the condensing portion that is perpendicular to the circumferential direction of the condensing portion. The inlet portion communicates with all of the through holes. The outlet portion is connected to the other end face of the condensing portion that is perpendicular to the circumferential direction of the condensing portion. The outlet portion communicates with all of the through holes. The open end of the inlet portion is connected to an inflow passage of the refrigerant . The open end of the outlet portion is connected to an outflow passage of the refrigerant which section area is smaller than that of the inflow passage. The condensing portion is inserted into and fixed to the column-like shaped heat absorption portion.
The end faces of the condensing portion that are perpendicular to the circumference thereof not only means those formed by dividing the entire circumference thereof into two semicircles, but also means those formed by cutting the condensing portion at one portion on its circumference.
By employing the above-described configur tion, the present invention provides the following functions and effects. Namely, if temperature of a refrigerant is merely lowered at a heat-rejecting portion, no more than the amount of heat is rejected which corresponds to • the multiplier of the heat capacity of the refrigerant by the temperature differentials of the refrigerant. On the other hand, the present invention enables to reject a larger amount of heat by condensing a refrigerant vapor at a condensing portion, to achieve a highly effective heat transfer. Moreover, the condensing portion is configured so that the entire periphery of the column-like shaped heat absorption portion is surrounded with a flat plate having a number of narrow through holes arranged. Accordingly, while the heat transfer area can be larger, the heat absorption portion and the heat condensing portion attached thereto can be smaller.
Further, as the condensing portion is attached only by inserting it to the column-like shaped heat absorption portion, attachment and detachment can be easier, and assembling and maintenance workability is improved without impairing its heat transfer performance.
The section area of the outflow passage of the refrigerant is smaller than that of the inflow passage, because as the volume of the vaporized refrigerant drastically decreases by condensing, smaller section area is enough for the outflow passage.
In accordance with a second aspect of the present invention, the condenser in the first aspect thereof is further provided with a clamp formed so as to surround the condensing portion, inserted into the column-like shaped heat absorption portion, and attached to it by fastening the clamp. With employing the above-described configuration, the present invention provides the following functions and effects. When the condensing portion is inserted into the column-like shaped heat absorption portion, if either the
■ outer periphery of the heat absorbing portion or the inner circumference of the condensing portion is not precisely finished, they has to loosely contact with each other, causing poorer heat transfer performances . In the present invention, however, in which the outer circumference of the condensing portion is fastened to the heat absorption portion by means of a clamp, they closely contacts with each other, enabling easy attachment and detachment without reducing its heat transfer performance. Consequently, the invention improves workability of assembly, maintenance or inspection without impairing heat transfer performance. In accordance with a third aspect of the present invention, the condensing portion either in the first or second aspect thereof is comprised of a plurality of hollow tubes that are arranged in parallel with each other.
In this configuration, nearly equal functions and effects as mentioned above can be achieved at a lower cost . In accordance with a fourth aspect of the present invention, an evaporator that vaporizes a liquid refrigerant by absorbing heat from an exterior heat source includes a vaporizing portion, an inlet portion, and an outlet portion. The vaporizing portion is formed of a flat plate provided with a plurality of through holes arranged in parallel with each other. The inlet and outlet portions being hollow tubes have a closed end and an open end respectively. The inlet portion is connected to one end portion of the vaporizing portion at its outer circumferential surface. The inlet portion further communicates with all of the through holes. The outlet portion is connected to the other end portion of the vaporizing portion at its outer
■ circumferential surface. The outlet portion further communicates with all of the through holes. The open end of the inlet portion is connected to an inflow passage of the refrigerant . The open end of the outlet portion is connected to an outflow passage of the refrigerant which section area is larger than that of the inflow passage. The vaporizing portion is attached to the exterior heat source.
The above-mentioned configuration of the present invention provides following effects. Generally, in raising the temperature of a cold liquid refrigerant at a cooling portion, no less than the amount of heat is absorbed which corresponds to the multiplier of the heat capacity of the liquid refrigerant by the temperature difference thereof. On the other hand, in the present invention, if the liquid refrigerant is vaporized at an evaporator, an amount of heat equivalent to the vaporization heat thereof may be absorbed, thereby higher heat transfer performance is achieved. Further, as the heat transfer area of the evaporator is enlarged by employing a flat plate with a number of through holes disposed therein in parallel with each other, the evaporator attached to the exterior heat source can be reduced in size. This configuration of the present invention is especially effective for highly integrated small objects such as the CPUs for computer.
Further, the evaporator can be easily attached to or detached from objects to be cooled by means of nuts or clamps, assembly, maintenance and inspection thereof can be improved without impairing its heat transfer performance.
Furthermore, in the evaporator of the present invention, the section area of the outflow passage of the refrigerant is larger than that of the inflow passage, as volume of the refrigerant increases greatly by the vaporization.
In accordance with a fifth aspect of the present invention, an evaporator that vaporizes a liquid refrigerant by absorbing heat from air passing through includes a vaporizing portion, an inlet portion, an outlet portion and a fin. The vaporizing portion is formed of a flat plate provided with a plurality of through holes arranged in parallel with each other. The vaporizing portion is bended to insert a space having predetermined height and length between it .
The fin is inserted into the space crossing with the through hole direction. The inlet and outlet portions being hollow tubes have a closed end and an open end respectively. The inlet portion is connected to one lower end portion of the vaporizing portion at its outer circumferential surface. The inlet portion further communicates with all of the through holes. The outlet portion is connected to the other higher end portion of the vaporizing portion at its outer circumferential surface. The outlet portion further communicates with all of the through holes. The open end of the inlet portion is connected to an inflow passage of the refrigerant . The open end of the outlet portion is connected to an outflow passage of the refrigerant which section area is larger than that of the inflow passage.
The above-mentioned configuration of the present invention provides following effects. The heat transfer area of the evaporator can be enlarged by employing a flat plate with a number of through holes. Further, the evaporator with long length can be small sized by bending it. And further more, the heat transfer area with hot air passing through can be increased by installing the fin between the bended vaporizing portion. Consequently, the evaporator can be small sized, while the heat transfer aria with the refrigerant and the hot air passing through can be increased.
In accordance with a sixth aspect of the present invention, the vaporizing portion either in the fourth or fifth aspect thereof is formed of a plurality of hollow tubes arranged in parallel with each other.
By employing above-mentioned configuration of the present invention, same effects as previously mentioned can be achieved at a lower cost . In accordance with a seventh aspect of the present invention, there is provided a cooling device comprising the condenser either in the first, second, or third aspect thereof and the evaporator either in the fourth, fifth or sixth aspect thereof, wherein the outflow passage of the condenser is connected to the inflow passage of the evaporator, and the inflow passage of the condenser is connected to the outflow passage of the evaporator.
The above-mentioned configuration of the present invention can reduce the size of the device, enhance cooling efficiency, and improve workability of assembly, maintenance or inspection. BRIEF DESCRIPTION OF THE DRAWINGS
Fig.l is a schematic side view of the condenser according to the present invention.
Fig .2 is a schematic front view of the condenser according to the present invention.
Fig.3 is a schematic enlarged view of the cooling device according to the present invention.
Fig.4 is a schematic enlarged perspective view of inlet portions and outlet portions of the cooling device according to the present invention.
Fig.5 is a schematic plan view of the evaporator according to the present invention.
Fig.6 is a schematic front view of the evaporator according to the present invention. Fig.7 is a schematic perspective view of the evaporator with the thin fin between the bended vaporization portion.
Fig.8 is a schematic arrangement view of hollow tubes used for the condenser or the evaporator according to the present invention.
Fig.9 is a schematic view of a driving pump of refrigerant according to the present invention.
Fig.10 is a schematic view of a conventional cooling means .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Fig.l and 2 shows a condenser 10, which condenses a vaporized refrigerant by rejecting heat to a cylindrical heat absorption portion 19 that comprises an exterior cooling device. The condenser 10 is comprised of a condensing portion 11, an inlet portion 12, an outlet portion 13, and a clamp 14. As the refrigerant, suitable material of which phase changes from a gas to a liquid state, is chosen, for example like carbon dioxide. Depending on the temperature of the heat absorption portion 19 and the like, appropriate refrigerant and appropriate filling pressures are selected. The condensing portion 11 is comprised of a flat plate of aluminum formed so as to surround the outer periphery of the cylindrical heat absorption portion 19.
As shown in Fig.3, the flat plate 11 is provided so that a number of through holes 11a are disposed in parallel with each other in the direction of the circumference of the condensing portion 11. The flat plate 11 is divided into two semicircles at two positions of the circumference thereof; end faces lib and lie, which are perpendicular to the circumference of the flat plate 11. While the inlet portion 12 is connected to the end face lib of the flat plate 11 so as to communicate with all of the through holes 11a, the outlet portion 13 is connected to the end face lie of the flat plate 11 so as to communicate with all of the through holes 11a. As shown in Fig.4, the inlet portion 12 and outlet portion 13 are made from aluminum hollow tubes having closed ends 12a, 13a and open ends 12b, 13b, respectively. The slits 12c, 13c are formed on the circumferential surface of the inlet portion 12 and outlet portion 13, respectively, and connected to the end faces lib, lie of the flat plate 11 by brazing. While the open end 12b of the inlet portion 12 is connected by brazing to an inflow passage 15 of the refrigerant formed an aluminum tubes, the open end 13b of the outlet portion 13 is connected by brazing to an outflow passage 16 of the refrigerant. The section area of the outflow passage 16 is smaller than that of the inflow passage 15.
The clamp 14 is comprised of an insulator 14c and a band 14a. The insulator 14c is formed of polycarbonate thermoplastic resin in a semicircle shape so as to surround the outer periphery of the condensing portion 11. The band 14a is formed of stainless steel in a cylindrical shape so as to surround the outer surface of the insulator 14c. The condensing portion 11 is inserted into the cylindrical heat absorption portion 19 and fixed thereto in such a manner that the band 14a is fastened by inserting a bolt 17 into through holes formed in the both end portions 14b of the band 14a and screwing it by a nut 18.
The insulator 14c of synthetics resin is used as it enable to prevent heat of the outside air from being transmitted to the condensing portion 11 and also enables to utilize elasticity of the synthetics resin in applying uniform radial pressures for fastening the band 14a.
In other embodiment, the condensing portion 11 may be formed in a circumferential shape and cut at one portion thereon to form two end faces, and then either of those two end faces is connected with either the inlet portion 12 or the outlet portion 13.
Fig.5 and 6 shows an evaporator 20, which is comprised of a vaporizing portion 21, an inlet portion 22 and an outlet portion 23, and vaporizes the refrigerant by absorbing heat from an exterior heat source 29. The vaporizing portion 21 is comprised of a flat aluminum plate with a number of through holes 21a provided in parallel with each other. The inlet portion 22 and the outlet portion 23 are formed of hollow aluminum tubes, and have closed ends 22a, 23a and open ends 22b, 23b, respectively. One end portion 21b of the vaporizing portion 21 is connected to the outer surface of the inlet portion 22 by brazing so that all of the through holes 21 communicate therewith. The other end portion 21 c of the vaporizing portion 21 is connected to the outer surface of the outlet portion 23 by brazing so that all of the through holes 21a communicate therewith.
The open end 22b of the inlet portion 22 is connected to the inflow passage 25 of the refrigerant by brazing, and the open end 23b of the outlet portion 23 is connected to the outflow passage 26 of the refrigerant by brazing. The section area of the outflow passage 26 is larger than that of the inflow passage 25. The vaporizing portion 21 is inserted into a head block 24 formed of aluminum, and is screwed on the top face of the exterior heat source 29 at its through holes 24a.
The vaporizing portion 21 and the head block 24 may be integrally formed into a single-piece member, directly attached on the top face of the exterior heat source 29 by means of a cover for example, instead of the head block 24.
Fig.7 shows an evaporator 30 that vaporizes a liquid refrigerant by absorbing heat from air passing through. The evaporator 30 includes a vaporizing portion 31, an inlet portion 32, an outlet portion 33 and fins 34. The vaporizing portion 31 is formed of a aluminum flat plate with a plurality of through holes 31a arranged in parallel with each other. And the, vaporizing portion 31 is bended at three positions and forms three spaces having rectangular cross section between the flat portions of it. The fins 34 are formed to have wave shapes with thin aluminum plate, and inserted into the spaces contacting with the flat surfaces of the vaporizing portion 31 at top position of the wave shapes .
The inlet portion 32 and the outlet portion 33 are aluminum hollow tubes having a closed end 32a, 33a and an open end 32b, 33b respectively.
The inlet portion 32 is connected to one lower end portion of the vaporizing portion 31 at its outer circumferential surf ce. And the inlet portion 32 communicates with all of the through holes 31a.
The outlet portion 33 is connected to the other higher end portion of the vaporizing portion 31 at its outer circumferential surf ce. And the outlet portion 33 communicates with all of the through holes 31a.
Then the open end 32b of the inlet portion 32 is connected to an inflow passage 35 of the refrigerant made from aluminum tube. And the open end 33b of the outlet portion 33 is connected to an outflow passage 36 of the refrigerant made from aluminum tube of which section area is larger than that of the inflow passage 35.
By employing the above-described configuration, the liquefied refrigerant flows into the lower position of the vaporizing portion 31 through the inflow passage 35, then gradually vaporizes within the through holes 31a, and finally flow out from the higher position of the vaporizing portion 31 through the outflow passage 36 with larger section area. In the above invention, the bending positions of the vaporizing portion 31 are not limited to three positions, but one, tow and more four bending position are available. And the wave shape of the fin 34 is not limited U shape, but V shape and other shapes are available. Fig.8 shows a plurality of hollow tubes 41 arranged and fixed in parallel with each other by brazing. Each of the hollow tubes 41 is made of aluminum and has 1mm in diameter. By employing those hollow tubes 41, either the condensing portion 11 or the vaporizing portion 21, 31 may be manufactured in a simpler manner and at a lower cost .
By applying the condenser 10 and evaporator 20 of the present invention to the heat reject portion 51 and heat absorption portion 52 in Fig.10 respectively, a compact cooling device which has higher cooling efficiency and easy maintenance is achieved.
If the condenser 10 is located in an upper position of the evaporator 20 as shown in Fig.10, the refrigerant can be continuously circulated without an external power by the gravity difference between the liquid refrigerant and the vaporized refrigerant. However, if the condenser 10 is located at an almost same position as the evaporator 20 or at a lower position than the evaporator 20, the refrigerant cannot be circulated without a driving pump.
Fig.9 shows a driving pump 60 so called "fish tail pump," which is known for its compact and simple structure. The driving pump 60 is installed in a refrigerant passage 65, and has a sheet spring 61 supported at the supporting point 63. As a small piece of metal such as iron is attached on the sheet spring 61, it is vibrated by an electromagnet 64. Vibration of the sheet spring 61 sends out the refrigerant in such a way that fish moves its tail fin. A small amount of power is enough to send out the refrigerant if the sheet spring 61 is vibrated at its resonance speed .

Claims

1. A condenser condensing a refrigerant gas by rejecting heat of said gas to a predetermined column-like shaped heat absorption portion of an exterior cooling device comprising: a condensing portion; an inlet portion; and an outlet portion; said condensing portion formed of a flat plate shaped so as to surround the entire periphery of said column-like shaped heat absorption portion, said condensing portion further having a plurality of through holes formed along the circumferential direction thereof and arranged in parallel with each other, said inlet and outlet portions being hollow tubes having a closed end and an open end respectively, said inlet portion connected to one end face of said condensing portion that is perpendicular to the circumferential direction of said condensing portion, said inlet portion communicating with all of said through holes, said outlet portion connected to the other end face of said condensing portion that is perpendicular to the circumferential direction of said condensing portion, said outlet portion communicating with all of said through holes, said open end of said inlet portion connected to an inflow passage of said refrigerant, said open end of said outlet portion connected to an outflow passage of said refrigerant which section area is smaller than that of said inflow passage, said condensing portion inserted into and fixed to said column-like shaped heat absorption portion.
2. The condenser of claim 1 wherein said condenser is provided with a clamp formed so as to surround said condensing portion, inserted into said column-like shaped heat absorption portion, and attached to it by fastening said clamp.
3. The condenser of either claim 1 or 2 wherein said condensing portion is comprised of a plurality of hollow tubes that are arranged in parallel with each other.
4. An evaporator vaporizing a liquid refrigerant by absorbing heat from an exterior heat source comprising: a vaporizing portion; an inlet portion; and an outlet portion; said vaporizing portion formed of a flat plate provided with a plurality of through ..holes arranged in parallel with each other, said inlet and outlet portions being hollow tubes having a closed end and an open end respectively, said inlet portion connected to one end portion of said vaporizing portion at its outer circumferential surface, said inlet portion further communicating with all of said through holes, said outlet portion connected to the other end portion of said vaporizing portion at its outer circumferential surface, said outlet portion further communicating with all of said through holes, said open end of said inlet portion connected to an inflow passage of said refrigerant, said open end of said outlet portion connected to an outflow passage of said refrigerant which section area is larger than that of said inflow passage, said vaporizing portion attached to said exterior heat source.
5. The evaporator vaporizing a liquid refrigerant by absorbing heat from air passing through comprising: a vaporizing portion; an inlet portion; and an outlet portion; a fin; said vaporizing portion formed of a flat plate provided with a plurality of through holes arranged in parallel with each other, said vaporizing portion bended to insert' a space having predetermined height and length between it, said fin inserted into said space crossing with said through hole direction, said inlet and outlet portions being hollow tubes having a closed end and an open end respectively, said inlet portion connected to one lower end portion of said vaporizing portion at its outer circumferential surface, said inlet portion further communicating with all of said through holes, said outlet portion connected to the other higher end portion of said vaporizing portion at its outer circumferential surface, said outlet portion further communicating with all of said through holes, said open end of said inlet portion connected to an inflow passage of said refrigerant, said open end of said outlet portion connected to an outflow passage of said refrigerant which section area is larger than that of said inflow passage.
6. The evaporator of claim 4-5 wherein said vaporizing portion is formed of a plurality of hollow tubes arranged in parallel with each other.
7. A cooling device comprising: the condenser cited in claim 1, 2 , or 3; the evaporator cited in claim 4, 5 or 6 ; wherein an outflow passage of said condenser is connected to an inflow passage of said evaporator, and an inflow passage of said condenser is connected to an outflow passage of said evaporator .
PCT/US2002/024191 2001-08-14 2002-08-01 Condenser, evaporator, and cooling device Ceased WO2003016795A1 (en)

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HK04109045.2A HK1066264B (en) 2001-08-14 2002-08-01 Condenser and cooling device comprising the same
US10/474,403 US7073567B2 (en) 2001-08-14 2002-08-01 Condenser evaporator and cooling device
DE10297119T DE10297119B4 (en) 2001-08-14 2002-08-01 Condenser, evaporator and cooler

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HK1066264A1 (en) 2005-03-18
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CN100464135C (en) 2009-02-25
DE10297119B4 (en) 2007-07-05

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