US3916644A - Dehumidifier with a plate-type evaporator - Google Patents

Dehumidifier with a plate-type evaporator Download PDF

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Publication number
US3916644A
US3916644A US494235A US49423574A US3916644A US 3916644 A US3916644 A US 3916644A US 494235 A US494235 A US 494235A US 49423574 A US49423574 A US 49423574A US 3916644 A US3916644 A US 3916644A
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United States
Prior art keywords
plate
dehumidifier
evaporator
plates
pair
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Expired - Lifetime
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US494235A
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English (en)
Inventor
Gamal El Din Nasser
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Linde GmbH
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Linde GmbH
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Publication of US3916644A publication Critical patent/US3916644A/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H13/00—Dispersing or preventing fog in general, e.g. on roads, on airfields
    • 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
    • F24F3/1405—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 in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
    • 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
    • F25B39/022—Evaporators with plate-like or laminated elements
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other

Definitions

  • ABSTRACT A dehumidifier has a closed heat-pump circuit with a blower arranged to pass a stream of air through a passage in the dehumidifier in which both the condenser and evaporator exchangers are provided, with the evaporator exchanger upstream of the condenser exchanger.
  • the evaporator exchanger is formed as a plate-type heat exchanger which comprises a stack of like corrugated plates arranged in pairs in a stack. The plates of each pair are mirror symmetrical about a plane passing through the interface between the pairs and therefore define a plurality of parallel and generally horizontal passages through which the humid gas is passed.
  • each plate is parallel to and offset from the corrugations of the immediately adjoining plate of the next pair by a distance equal to half a corrugation width so that there is formed between each pair a vertical generally sinusoidal flat passage through which the coolant is passed.
  • each plate is formed with generally vertical ridges which lie against similar ridges of the plate of the immediately adjoining pair so as to space each pair rigidly from the adjoining pairs.
  • the plates are all made of chromium steel and an aluminum foil is provided at the interface between each pair of plates and is formed with laterally extending V-shaped projections that serve to catch drips and lead them to the bottom of the evaporator whence they are carried away from the dehumidifier.
  • the present invention relates to a dehumidifier. More particularly this invention concerns such a dehumidifier having a closed heat-pump circuit with an upstream evaporator and a downstream condenser arranged in a passage.
  • the evaporator is conventionally a simple tube-type heat exchanger wherein the tubes are provided with ribs or fins for maximum heat-exchange surface.
  • a separator that catches the liquid condensed from the stream of air and channels it to an outlet drain.
  • Such tube-type exchangers require a relatively large flow cross section in order to obtain sufficient heat exchange so that the dehumidifier must be relatively bulky aand is expensive to manufacture.
  • corrosion-resisting materials such as expensive chromium-steel alloys, in order to prevent the already expensive evaporator from being rapidly destroyed.
  • the device is quite expensive.
  • Another object is the provision of such a dehumiditier which is relatively compact and inexpensive.
  • the plates are arranged in pairs with the corrugations of each plate being in line with those of the other plate of the pair, that is with their valleys in line and registering so as to form parallel humid-gas passages.
  • the corrugations of all but the two end plates are offset by half a corrugation width from the adjacent plate of the neighboring pair so that nonstraight transverse passages are formed for the coolant.
  • ridges transverse to the parallel passages are formed on the plates which bear on similar ridges of adjoining plates to keep the plate pairs spaced apart across the nonstraight passages.
  • Such an arrangement allows relatively large pressure differentials to exist between the coolant passages and the air passages without any possibility of leakage.
  • the use of only a single plate shape allows the device to be fabricated relatively inexpensively.
  • a plurality of identical plates are stamped out of stainless steel or the like and are thereafter properly arranged and soldered or welded into a stack that forms a very compact and efficient heat exchanger.
  • the air passages through such an exchanger are relatively large compared to the overall size of the unit so that good cooling and condensing is obtained.
  • each pair and the adjoining pair there is provided between each pair and the adjoining pair a thin metallic foil which lies in good heatconducting contact with both of the pairs so that it forms a secondary heat-exchange surface.
  • a thin metallic foil which lies in good heatconducting contact with both of the pairs so that it forms a secondary heat-exchange surface.
  • the foil is formed with a plurality of V-shaped projections which extend into the air passages of the plate pairs so as best to make the air flow through the apparatus turbulent and at the same time to catch condensed vapor and conduct it to an outlet at the bottom of the exchanger.
  • the passages for the air being dehumidified are generally straight and the passages for the cooling fluid are nonstraight, here generally sinusoidal.
  • V2A steel is used for the heat-exchanger plates and aluminum is used for the foil and the projections thereon.
  • the transverse passages are inclined relative to the vertical and/or the parallel flow passages are inclined relative to the horizontal so that water separated from the air in the latter passages is collected on the edges of the pairs of plates and can be conducted out of the apparatus. This eliminates the use of a complicated droplet separator as has been known hitherto.
  • the condenser and evaporator are both identically formed, thereby again reducing fabrication costs of the dehumidifier.
  • FIG. 1 is a side longitudinal section, partly in diagrammatic form, of a dehumidifier according to the present invention
  • FIG. 2 is a side view of the evaporator according to this invention.
  • FIGS. 3 and 4 are sections taken along the lines III- -III and IV-IV of FIG. 2, respectively.
  • a dehumidifier comprises a housing 1 formed with a passage 9 having an upstream inlet 6 and a downstream oulet 7 and provided with a platetype evaporator 2 and a plate-type condenser 4.
  • a fluid is pumped by a compressor 3 in the direction indicated by arrows 26 into the condenser 4 whence it flows through an expansion valve 5, and expands in the evaporator 2. Thereafter the fluid again flows in the closed circuit back to the compressor 3 and the cycle is completed.
  • a fan driven by a motor 16 serves to draw air as shown by arrows 8 in the inlet 6 and expel it from the outlet 7. Water condensed from the air stream is drawn out of the apparatus at 11.
  • the air stream is cooled in the evaporator 2 and the moisture therein is stripped therefrom. Thereafter the same air stream is heated in the condenser 4 and expelled from the apparatus at substantially the same temperature it entered.
  • the evaporator 2 shown in side view in FIG. 2 comprises a stack of like corrugated plates, four of which are shown at 12-15 in FIGS. 2-4. These plates are arranged in pairs 12, 13 and 14, with each plate being mirror symmetrical to the other plate of the pair across a plane P lying at the interface between the two plates. Thus the valleys of the corrugations of each plate lie against the valleys of the other plate of the respective pair.
  • Each of the plates 12 and 14 is offset by a distance d equal to one-half of the corrugation width D from the other plate 13 and 15 respectively, so that the crests of each plate are aligned with the valleys or troughs of the plate of the neighboring pair.
  • edges of the plates 12-l5 are here alternately connected with the edge of one or the other of the respective neighboring plates by means of welded seams 27.
  • transverse to these parallel passages 18 there are transverse ridges or crests 19 stamped in the plates 12-15 which connect the parallel passages 18 with one another and allow the plates 13 and 14 of the pairs 12, 13 and 14, 15 to abut one another firmly. Thus additional support devices between neighboring plate pairs such as spacer bars or the like are not needed.
  • thin foils 20 are inserted which are made of aluminum and 0.2 mm thick.
  • the foils 20 are formed inthe passages 19 with V-shaped projections 21 which create turbulence and catch drops.
  • the water caught on the projections 21 flows by gravity downwardly and collects in the lowermost passage '22 parallel to the passages 18 and is there caused to run out of the machine as shown by arrow 23.
  • a wall 28 perpendicular to the flow direction 8 and downstream of the passage 22 serves to catch this water and connect it to the water outlet 11 as shown in FIG. 1.
  • transverse passages 19 and the parallel passages 18 are inclined relative to the vertical and horizontal, indicated by dot dash lines V and H respectively, so that the water flows off them.
  • the parallel passages 18 of the plates 12-15 are somewhat deeper in the region of the transverse passages 19 so that here a narrowed flow cross section 24 exists such that the flow is directed against the V-shaped projections 21.
  • 15 sinusoidal passages 25 are formed through which the cooling fluid flows from the expansion valve 5 according to arrows 26.
  • the cooling fluid draws heat out of the plates 1215 and the foil 20 with the projections 21 and thereby condenses liquid out of the humid gas passing through the evaporator 2. This produces cold and dry air.
  • the cooling fluid is compressed and heated up so that it serves to heat the condenser 4 and thereby warms up the cold and dry air so as to produce warm dry air approximately the same temperature as the input air.
  • a dehumidifier comprising:
  • a housing forming a passage having an inlet and an outlet
  • a plate-type condenser in said passage traversed by said current after it has passed through said evaporator, said evaporator and said condenser being connected in a closed coolant circuit;
  • said evaporator being formed of a stack of generally similar and generally planar plates each formed with a plurality of regular corrugations having crests spaced from the plane of the respective plate and valleys at the respective plane, said plates being disposed in pairs with the valleys of one plate of each pair turned inwardly toward and registering with the valleys of the other plate of the pair, whereby a plurality of parallel passages are formed between the plates of each pair between the corrugations thereof, the crests of each plate turned toward plate being in line with the valleys thereof, whereby a plurality of nonstraight passages trans verse to said parallel passages are formed between confronting plates of adjoining pairs, each of said plates being formed with a plurality of ridges projecting from the respective plate plane and abutting a respective ridge of the adjoining plate of the neighboring pair.
  • dehumidifier defined in claim 1 wherein said passages are inclined to the horizontal, said dehumidifier further comprising means for collecting condensate from the lower edges of said plates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US494235A 1973-08-07 1974-08-02 Dehumidifier with a plate-type evaporator Expired - Lifetime US3916644A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732340003 DE2340003A1 (de) 1973-08-07 1973-08-07 Entnebelungsvorrichtung

Publications (1)

Publication Number Publication Date
US3916644A true US3916644A (en) 1975-11-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US494235A Expired - Lifetime US3916644A (en) 1973-08-07 1974-08-02 Dehumidifier with a plate-type evaporator

Country Status (8)

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US (1) US3916644A (xx)
JP (1) JPS5072442A (xx)
CA (1) CA1007049A (xx)
CH (1) CH570594A5 (xx)
DE (1) DE2340003A1 (xx)
FR (1) FR2240413B3 (xx)
GB (1) GB1462295A (xx)
IT (1) IT1017855B (xx)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062129A (en) * 1976-08-02 1977-12-13 Takasago Thermal Engineering Co., Ltd. Arrangement for preparing hot compressed air of reduced moisture content suitable for use in operation of blast furnace
US4118209A (en) * 1975-07-18 1978-10-03 Pakhoed-Rotterdam B.V. Climate-control unit particularly for incorporation in a container
US4354551A (en) * 1979-05-25 1982-10-19 Alfa-Laval Ab Heat exchanger
US4517810A (en) * 1983-12-16 1985-05-21 Borg-Warner Limited Environmental control system
US5400607A (en) * 1993-07-06 1995-03-28 Cayce; James L. System and method for high-efficiency air cooling and dehumidification
US5445320A (en) * 1993-01-26 1995-08-29 Technip Method of and equipment for snow production
EP1085285A3 (de) * 1999-09-16 2002-05-08 Balcke-Dürr Energietechnik GmbH Plattenwärmetauscher und Verdampfer
US6435270B2 (en) * 2000-03-17 2002-08-20 Xcellsis Gmbh Lamina stack for a two-pass evaporator
US20050091993A1 (en) * 2002-02-28 2005-05-05 Paradis Marc A. Method and apparatus for cooling and dehumidifying air
US20050144978A1 (en) * 2004-01-07 2005-07-07 Papapanu Steven J. Full plate, alternating layered refrigerant flow evaporator
US20100251749A1 (en) * 2005-06-27 2010-10-07 Behr Gmbh & Co. Kg Air conditioning unit
EP2508831A1 (en) * 2011-04-07 2012-10-10 Alfa Laval Corporate AB Plate heat exchanger
US20130160970A1 (en) * 2011-12-27 2013-06-27 Takubo Machine Works Co., Ltd. Dehumidifier
CN106437203A (zh) * 2015-04-28 2017-02-22 杨晓富 一种能够驱除雾气的银亭
US11592238B2 (en) 2017-11-23 2023-02-28 Watergen Ltd. Plate heat exchanger with overlapping fins and tubes heat exchanger
RU2814625C1 (ru) * 2023-08-16 2024-03-01 Федеральное Государственное Бюджетное Учреждение "Институт Прикладной Геофизики Имени Академика Е.К. Федорова" (Фгбу "Ипг") Устройство для рассеивания тумана путем сепарации капель

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700220C3 (de) * 1977-01-05 1981-04-30 Linde Ag, 6200 Wiesbaden Plattenwärmetauscher
DE3239816A1 (de) * 1982-05-24 1983-11-24 Dvt Deutsch Verfahrenstech Verfahren zur destillation von suesswasser aus meerwasser
DE3219387A1 (de) * 1982-05-24 1983-12-01 D.V.T. Büro für Anwendung Deutscher Verfahrenstechnik H. Morsy, 4000 Düsseldorf Anordnung zum entsalzen von meerwasser nach dem multieffekt-verdampfungsverfahren
NL8403933A (nl) * 1984-12-24 1986-07-16 Gen Electric Warmtewisselaar.
US4742870A (en) * 1986-10-29 1988-05-10 Cobe Laboratories Heat exchanger
GB2279143B (en) * 1993-05-27 1995-07-05 Behr Gmbh & Co A housing for a motor vehicle air-conditioning system
EP1106729B1 (de) * 1999-12-02 2003-07-23 Joma-Polytec Kunststofftechnik GmbH Kreuzstrom-Wärmetauscher für Kondensationswäschetrockner
CN111013342B (zh) * 2020-01-02 2021-09-28 北京机械设备研究所 一种用于真空环境的除湿装置及除湿方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751757A (en) * 1928-01-14 1930-03-25 Walter M Cross Heat exchanger
US1775103A (en) * 1928-12-28 1930-09-09 Hume James Howden Apparatus for heating fluids
US2438120A (en) * 1944-01-27 1948-03-23 Kidde Mfg Co Inc Apparatus for dehumidifying air
US2930208A (en) * 1958-03-14 1960-03-29 Westinghouse Electric Corp Dehumidification apparatus
US3469626A (en) * 1967-01-19 1969-09-30 Apv Co Ltd Plate heat exchangers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751757A (en) * 1928-01-14 1930-03-25 Walter M Cross Heat exchanger
US1775103A (en) * 1928-12-28 1930-09-09 Hume James Howden Apparatus for heating fluids
US2438120A (en) * 1944-01-27 1948-03-23 Kidde Mfg Co Inc Apparatus for dehumidifying air
US2930208A (en) * 1958-03-14 1960-03-29 Westinghouse Electric Corp Dehumidification apparatus
US3469626A (en) * 1967-01-19 1969-09-30 Apv Co Ltd Plate heat exchangers

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118209A (en) * 1975-07-18 1978-10-03 Pakhoed-Rotterdam B.V. Climate-control unit particularly for incorporation in a container
US4062129A (en) * 1976-08-02 1977-12-13 Takasago Thermal Engineering Co., Ltd. Arrangement for preparing hot compressed air of reduced moisture content suitable for use in operation of blast furnace
US4354551A (en) * 1979-05-25 1982-10-19 Alfa-Laval Ab Heat exchanger
US4517810A (en) * 1983-12-16 1985-05-21 Borg-Warner Limited Environmental control system
US5445320A (en) * 1993-01-26 1995-08-29 Technip Method of and equipment for snow production
US5400607A (en) * 1993-07-06 1995-03-28 Cayce; James L. System and method for high-efficiency air cooling and dehumidification
EP1085285A3 (de) * 1999-09-16 2002-05-08 Balcke-Dürr Energietechnik GmbH Plattenwärmetauscher und Verdampfer
US6435270B2 (en) * 2000-03-17 2002-08-20 Xcellsis Gmbh Lamina stack for a two-pass evaporator
US20050091993A1 (en) * 2002-02-28 2005-05-05 Paradis Marc A. Method and apparatus for cooling and dehumidifying air
US20050144978A1 (en) * 2004-01-07 2005-07-07 Papapanu Steven J. Full plate, alternating layered refrigerant flow evaporator
US7080526B2 (en) * 2004-01-07 2006-07-25 Delphi Technologies, Inc. Full plate, alternating layered refrigerant flow evaporator
US20100251749A1 (en) * 2005-06-27 2010-10-07 Behr Gmbh & Co. Kg Air conditioning unit
EP2508831A1 (en) * 2011-04-07 2012-10-10 Alfa Laval Corporate AB Plate heat exchanger
WO2012136432A1 (en) * 2011-04-07 2012-10-11 Alfa Laval Corporate Ab Plate heat exchanger
US20130160970A1 (en) * 2011-12-27 2013-06-27 Takubo Machine Works Co., Ltd. Dehumidifier
US9470441B2 (en) * 2011-12-27 2016-10-18 Takubo Machine Works Co., Ltd. Dehumidifier having flat plate air-to-air heat exchanger
CN106437203A (zh) * 2015-04-28 2017-02-22 杨晓富 一种能够驱除雾气的银亭
US11592238B2 (en) 2017-11-23 2023-02-28 Watergen Ltd. Plate heat exchanger with overlapping fins and tubes heat exchanger
RU2814625C1 (ru) * 2023-08-16 2024-03-01 Федеральное Государственное Бюджетное Учреждение "Институт Прикладной Геофизики Имени Академика Е.К. Федорова" (Фгбу "Ипг") Устройство для рассеивания тумана путем сепарации капель

Also Published As

Publication number Publication date
CA1007049A (en) 1977-03-22
CH570594A5 (xx) 1975-12-15
JPS5072442A (xx) 1975-06-16
GB1462295A (en) 1977-01-19
FR2240413B3 (xx) 1977-06-03
FR2240413A1 (xx) 1975-03-07
IT1017855B (it) 1977-08-10
DE2340003A1 (de) 1975-02-20

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