EP1394491B1 - Plate heat exchanger - Google Patents

Plate heat exchanger Download PDF

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Publication number
EP1394491B1
EP1394491B1 EP03017674A EP03017674A EP1394491B1 EP 1394491 B1 EP1394491 B1 EP 1394491B1 EP 03017674 A EP03017674 A EP 03017674A EP 03017674 A EP03017674 A EP 03017674A EP 1394491 B1 EP1394491 B1 EP 1394491B1
Authority
EP
European Patent Office
Prior art keywords
plates
heat exchanger
plate heat
uneven
ducts
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.)
Expired - Lifetime
Application number
EP03017674A
Other languages
German (de)
French (fr)
Other versions
EP1394491A3 (en
EP1394491A2 (en
Inventor
Giuseppe Sella
Giovanni Antonio Longo
Roberto Sartori
Bruno Benetton
Giorgio Lunardi
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.)
ONDA SpA
Original Assignee
ONDA SpA
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 ONDA SpA filed Critical ONDA SpA
Publication of EP1394491A2 publication Critical patent/EP1394491A2/en
Publication of EP1394491A3 publication Critical patent/EP1394491A3/en
Application granted granted Critical
Publication of EP1394491B1 publication Critical patent/EP1394491B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
    • 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
    • F28D9/0043—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 plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/005—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 plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making

Definitions

  • the present invention relates to a plate heat exchanger, particularly but not exclusively useful for condensing and evaporating refrigerating fluids.
  • plate heat exchangers are devices used to transfer heat energy from one fluid to another and are constituted by a plurality of mutually facing metal plates shaped so as to form, in the spaces between two adjacent plates, a corresponding plurality of passage circuits for the fluids.
  • the plates are usually rectangular, are commonly obtained by pressing and have appropriate corrugations, substantially in the central region, and generally have four openings at their corners.
  • the corrugations are designed to stiffen the plates and to improve heat exchange, while the openings are designed to provide the ducts for the distribution and recovery of the fluids.
  • the plates are sealed at their perimeter and at their input and output ducts by means of gaskets or by welding and/or braze welding, so as to prevent the escape of the fluids from the respective ducts and from the circuits formed between the facing plates.
  • Operation of plate heat exchangers consists in producing the alternating flow, in the passage circuits, of a refrigerating fluid, which evaporates or condenses, and of a heat transfer fluid, which becomes cooler or warmer.
  • EP-1094291 discloses a plate heat exchanger having a combination of features as set forth in the pre-characterizing portion of the appended claim 1.
  • the aim of the present invention is to provide a plate heat exchanger with improved performance with respect to exchangers currently in use while maintaining a low production cost and achieving high reliability and durability.
  • the plate heat exchanger generally designated by the reference numeral 1, comprises a plurality of mutually facing plates 2 and generally at least two ducts, an input duct 3a and an output duct 3b, for a respective fluid.
  • the plates 2 are coupled hermetically to each other at a substantially peripheral portion 4 and at the ducts 3 a and 3b by braze welding.
  • Each plate 2 has, as shown more clearly in Figure 2 , a main corrugation arranged in a herringbone pattern, which is adapted to increase and facilitate the exchange of heat among passage circuits formed between two adjacent plates 2.
  • At least one of the plates 2 has at least one face that comprises at least one uneven portion 5.
  • Said portion 5 is uneven thanks to the presence of microengravings and/or microgrooves and/or microindentations.
  • each plate 2 has at least one completely uneven face.
  • the adjacent plates 2 are assembled so that their completely or partially uneven faces form at least the ducts for the refrigerating fluid.
  • the uneven portion 5 of the plates 2 is obtained by laser alteration.
  • microengravings and/or microgrooves and/or microindentations on the exchange surface in fact increases the area of the exchange surface, increases the turbulence of the fluid in contact with the exchange surface, facilitates the drainage of the liquid along the exchange surface in condensation processes and bubble nucleation the evaporation processes.
  • the materials used may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Fuel Cell (AREA)

Abstract

A plate heat exchanger (1), comprising a plurality of mutually facing plates (2) that are hermetically coupled at at least one substantially peripheral portion (4) and form at least two separate circuits for at least two fluids, each one of said plurality of plates (2) having access ports that provide input ducts (3a) and output ducts (3b) for said at least two fluids, at least one portion (5) of at least one face of at least one of said plurality of plates (2) being uneven. <IMAGE>

Description

  • The present invention relates to a plate heat exchanger, particularly but not exclusively useful for condensing and evaporating refrigerating fluids.
  • As is known, plate heat exchangers are devices used to transfer heat energy from one fluid to another and are constituted by a plurality of mutually facing metal plates shaped so as to form, in the spaces between two adjacent plates, a corresponding plurality of passage circuits for the fluids.
  • The plates are usually rectangular, are commonly obtained by pressing and have appropriate corrugations, substantially in the central region, and generally have four openings at their corners. The corrugations are designed to stiffen the plates and to improve heat exchange, while the openings are designed to provide the ducts for the distribution and recovery of the fluids.
  • The plates are sealed at their perimeter and at their input and output ducts by means of gaskets or by welding and/or braze welding, so as to prevent the escape of the fluids from the respective ducts and from the circuits formed between the facing plates.
  • Operation of plate heat exchangers consists in producing the alternating flow, in the passage circuits, of a refrigerating fluid, which evaporates or condenses, and of a heat transfer fluid, which becomes cooler or warmer.
  • EP-1094291 discloses a plate heat exchanger having a combination of features as set forth in the pre-characterizing portion of the appended claim 1.
  • The aim of the present invention is to provide a plate heat exchanger with improved performance with respect to exchangers currently in use while maintaining a low production cost and achieving high reliability and durability.
  • In accordance with the invention, there is provided a plate heat exchanger as defined in the appended claims.
  • Further aspects and advantages of the present invention will become better apparent from the following detailed description of some currently preferred examples of embodiments, given merely by way of non-limitative example with reference to the accompanying drawings, wherein:
    • Figure 1 is a partially sectional perspective view of the plate heat exchanger according to the invention;
    • Figure 2 is a perspective view of a plate of the plate exchanger according to the invention;
    • Figure 3 is an enlarged-scale plan view of a portion of a plate of the heat exchanger according to the invention, with a surface that is uneven due to the presence of microengravings.
  • In the examples of embodiment that follow, individual characteristics, given in relation to specific examples, may actually be interchanged with other different characteristics that exist in other examples of embodiment.
  • With reference to the figures, the plate heat exchanger according to the invention, generally designated by the reference numeral 1, comprises a plurality of mutually facing plates 2 and generally at least two ducts, an input duct 3a and an output duct 3b, for a respective fluid.
  • The plates 2 are coupled hermetically to each other at a substantially peripheral portion 4 and at the ducts 3 a and 3b by braze welding.
  • Each plate 2 has, as shown more clearly in Figure 2, a main corrugation arranged in a herringbone pattern, which is adapted to increase and facilitate the exchange of heat among passage circuits formed between two adjacent plates 2.
  • According to the invention, at least one of the plates 2 has at least one face that comprises at least one uneven portion 5.
  • Said portion 5 is uneven thanks to the presence of microengravings and/or microgrooves and/or microindentations.
  • In one example of embodiment, each plate 2 has at least one completely uneven face.
  • The adjacent plates 2 are assembled so that their completely or partially uneven faces form at least the ducts for the refrigerating fluid.
  • Moreover, nothing prevents the use of plates 2 in which both faces are uneven.
  • According to the invention, the uneven portion 5 of the plates 2 is obtained by laser alteration.
  • Operation of a plate heat exchanger according to the invention is clearly evident from what has been described above.
  • In practice it has been found that a plate heat exchanger according to the invention fully achieves the intended aim and objects.
  • In particular, the fact is stressed that thanks to the presence of the uneven portion or of the uneven face or faces, a considerable improvement in the performance of the plate heat exchanger according to the invention in the condensation and evaporation of refrigerating fluids has been achieved.
  • The presence of microengravings and/or microgrooves and/or microindentations on the exchange surface in fact increases the area of the exchange surface, increases the turbulence of the fluid in contact with the exchange surface, facilitates the drainage of the liquid along the exchange surface in condensation processes and bubble nucleation the evaporation processes.
  • All the characteristics of the invention indicated above as advantageous, convenient or the like may also be omitted or be replaced by equivalents.
  • The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.
  • In practice, the materials used, so long as they are compatible with the contingent use, as well as the shapes and dimensions, may be any according to requirements.
  • All the details may further be replaced with other technically equivalent elements.
  • Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims (3)

  1. A plate heat exchanger (1), comprising a plurality of mutually facing plates (2) that are hermetically coupled at at least one substantially peripheral portion (4) and form at least two separate circuits for at least two fluids, each one of said plurality of plates (2) having access ports that provide input ducts (3a) and output ducts (3b) for said at least two fluids, said plates (2) comprising a main corrugation for increased heat exchange among said circuits formed between adjacent plates (2),
    wherein said main corrugation is arranged in a herringbone pattern, and wherein, said plurality of plates (2) are joined to each other by braze welding at said peripheral portion (4) and at the ducts (3a, 3b),
    characterized in that
    at least one portion (5) of at least one face of at least one of said plurality of plates (2) is uneven thanks to the presence of microengravings, microgrooves, and/or micro-indentations formed on top of said main corrugation by laser alteration.
  2. The plate heat exchanger according to claim 1, characterized in that said at least one face provided with at least one uneven portion (5) forms, together with the respective adjacent and facing plate (2), one of said at least two circuits.
  3. The plate heat exchanger according to one or more of the preceding claims, characterized in that at least one face of each one of said plurality of plates (2) is uneven.
EP03017674A 2002-08-26 2003-08-14 Plate heat exchanger Expired - Lifetime EP1394491B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000051U ITVR20020051U1 (en) 2002-08-26 2002-08-26 PLATE HEAT EXCHANGER.
ITVR20020051 2002-08-26

Publications (3)

Publication Number Publication Date
EP1394491A2 EP1394491A2 (en) 2004-03-03
EP1394491A3 EP1394491A3 (en) 2005-08-17
EP1394491B1 true EP1394491B1 (en) 2009-04-08

Family

ID=31198630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03017674A Expired - Lifetime EP1394491B1 (en) 2002-08-26 2003-08-14 Plate heat exchanger

Country Status (6)

Country Link
US (1) US20040226704A1 (en)
EP (1) EP1394491B1 (en)
AT (1) ATE428097T1 (en)
CA (1) CA2437780A1 (en)
DE (1) DE60327026D1 (en)
IT (1) ITVR20020051U1 (en)

Families Citing this family (15)

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US7032654B2 (en) * 2003-08-19 2006-04-25 Flatplate, Inc. Plate heat exchanger with enhanced surface features
SE527716C2 (en) * 2004-04-08 2006-05-23 Swep Int Ab plate heat exchangers
DE102005034305A1 (en) * 2005-07-22 2007-01-25 Behr Gmbh & Co. Kg Plate element for a plate cooler
US20070261834A1 (en) * 2006-05-09 2007-11-15 Kaori Heat Treatment Co., Ltd. Heat exchanger having uneven flowing paths
CN102027306B (en) * 2008-03-13 2013-01-16 丹佛斯公司 A double plate heat exchanger
PT2591303E (en) 2010-07-08 2015-11-16 Swep Int Ab A plate heat exchanger
CN106105410A (en) * 2014-01-22 2016-11-09 高克联管件有限公司 For the miniature fin plate of two sided of platelet heat exchangers
US10224263B2 (en) 2014-01-22 2019-03-05 Provides Metalmeccanica S.R.L. Heat exchanger
USD763804S1 (en) * 2014-02-06 2016-08-16 Kobe Steel, Ltd. Plate for heat exchanger
USD757662S1 (en) * 2014-02-06 2016-05-31 Kobe Steel, Ltd. Plate for heat exchanger
JP6219199B2 (en) * 2014-02-27 2017-10-25 株式会社神戸製鋼所 Base plate material to be heat exchange plate, and method for manufacturing the base plate material
PT3467423T (en) * 2017-10-05 2020-09-01 Alfa Laval Corp Ab Heat transfer plate and a plate pack for a heat exchanger comprising a plurality of such heat transfer plates
SE541905C2 (en) 2017-12-05 2020-01-02 Swep Int Ab Heat exchanger and method for forming heat exchanger plates
US11412640B2 (en) 2019-07-29 2022-08-09 Pratt & Whitney Canada Corp. Plate cooler for aircraft electronic components
US11414202B2 (en) 2019-11-06 2022-08-16 Pratt & Whitney Canada Corp. Plate cooler for aircraft electronic components

Citations (1)

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EP1094291A2 (en) * 1999-10-22 2001-04-25 Ebara Corporation Plate heat exchanger

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Also Published As

Publication number Publication date
ITVR20020051U1 (en) 2004-02-27
ATE428097T1 (en) 2009-04-15
US20040226704A1 (en) 2004-11-18
CA2437780A1 (en) 2004-02-26
DE60327026D1 (en) 2009-05-20
EP1394491A3 (en) 2005-08-17
EP1394491A2 (en) 2004-03-03

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