EP0701679A1 - Panel for regenerative heat-exchangers - Google Patents
Panel for regenerative heat-exchangersInfo
- Publication number
- EP0701679A1 EP0701679A1 EP93913335A EP93913335A EP0701679A1 EP 0701679 A1 EP0701679 A1 EP 0701679A1 EP 93913335 A EP93913335 A EP 93913335A EP 93913335 A EP93913335 A EP 93913335A EP 0701679 A1 EP0701679 A1 EP 0701679A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mesh
- heat exchange
- wall member
- element according
- exchange panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
-
- 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
- F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
- F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
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- 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
- F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
- F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
- F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
- F28D19/042—Rotors; Assemblies of heat absorbing masses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
Definitions
- the present invention relates to a heat exchange panel or element adapted for use in a regenerative or recuperative type heat exchanger and such as may be used in packages of many such panels or elements within a regenerative or recuperative gas to gas, vapour bearing gas to gas or gas or vapour bearing gas to air heat exchanger of the well known Ljungstrom or similar type.
- a body of sheet elements or panels is alternately exposed to passage through the interstitial spaces between the individual elements of a hotter flow of gas or gas and vapour and a cooler flow of gas,gas and vapour or air. It is the purpose of the elements or panels to accept and store heat energy as rapidly as possible from the hotter flow and when after a time interval a cooler flow is directed through the same interstitial spaces to give out the stored heat energy to the cooler flow thus raising the temperature of that flow.
- the elements or panels may be rotated or translated in such a way that they proceed alternately through the hotter and cooler flows. Alternatively the elements or panels may be stationary and the hotter and cooler flows respectively directed by means of dampers to pass alternately through the elements or panels.
- This invention has application for such regenerative and recuperative gas to gas or gas to air heat exchangers particularly, but not exclusively, where one or both of the gas flows, or the gas flow, contains vapours at or near their condensing temperatures or dew point and which vapours are corrosive to certain metals and other materials and which may be in a particular instance oxides of sulphur and of nitrogen as produced during the combustion of fossil and other fuels.
- the present invention consists in a heat exchange panel or element adapted for use in a regenerative or recuperative type heat exchanger characterised in that it comprises a heat storage and transfer member which includes a composite wall member made from portions of different thermal conductivity, one said portion of higher thermal conductivity comprising a metal mesh of strips or strands and a second said portion of lower thermal conductivity constituting an encapsulating layer enveloping and extending through the mesh so that the portions are intimately interlocked together against separation and the composite wall member is enabled to operate at higher temperatures than could the material of the encapsulating layer alone, the thickness of the encapsulating layer outside the mesh being substantially less than the transverse extent of the mesh across the total thickness of the wall member and said transverse extent of the mesh being substantially to outer surfaces of the wall member whereby the mesh conducts heat from the outer surfaces to promote the heat absorption of the wall member, and at least some of the mesh continuing longitudinally and directly throughout the major part of the length and breadth of the wall member such that differential temperature between any two diverse
- the encapsulating layer be composed of a material, such as a plastics, which may or may not be filled with particulated mineral or other substance to provide as high a heat capacity as possible for any given volume or mass of the filled material.
- the encapsulating layer on both sides of the wall member be composed of a plastics or other material which is inert and resistant to corrosive effects of condensing vapours of acid gaseous oxides or vapours which may condense upon it.
- the thickness of the material of the encapsulating layer outside the mesh is of the order of 0.1-0.3mm.
- the average density of such a metal mesh and plastics composite wall member is considerably less than that of the equivalent metal or glass enamelled metal elements presently in use in the aforementioned heat exchangers whereas the specific heat capacity of the wall member is for any given volume as good as for metal or glass enamelled metal elements.
- Surfaces of the wall member of a panel or element in accordance with the present invention which are corrosion resistant as described above may be chosen from preferred plastics such as to reduce the adherence and building up of dust or scales on the surfaces, and, as taught in UK Patent Number 1 372 680, could be made to be non-fouling in respect of organic and other agents or growths.
- the encapsulating layer may be made of another suitable material of lower thermal conductivity than the metal mesh, if desired, for example glass.
- the metal mesh which forms the heat conducting material within the proposed panel or element also operates as a reinforcing grid within the panel or element imparting structural stability to the panel or element. That stability would not be present if a panel or element of purely plastics material were to be used, and it enables greater rigidity and stability to be imparted to any preferred ridging, folding or other profile forming of the panel or element for it to present undulating surfaces for enhanced heat transfer at those surfaces.
- the mesh may comprise interwoven or overlaid discrete metal strips or strands of wire or filament, for example of steel, aluminium, copper or brass, or it may comprise a sheet of metal, for example of one of the metals just mentioned, which has been pierced and expanded such that the sheet whilst retaining its unity effectively presents a network of strip or strand portions.
- a preferred material is that known as EXPAMET which is metal sheet which has been pierced, expanded and subsequently flattened.
- EXPAMET is metal sheet which has been pierced, expanded and subsequently flattened.
- the percentage open area of such a sheet between the strip or strand portions may vary, typically between 5 and 25% of the total area of the mesh.
- the thickness of the metal of the mesh may vary with the size of the panel but typically will be 0.3-1.0mm thick, resulting in a typical total, or laminate, thickness, of the wall member between 0.5 and 1.5mm.
- the encapsulating layer extends through the mesh as well as over it, it fully envelopes and bonds mechanically to the mesh so that the two are interlocked together to prevent separation of the layer from the mesh.
- a regenerative or recuperative type heat exchanger which includes a heat exchange panel or element in accordance with the first aspect of the invention herein set forth.
- a regenerative or recuperative heat exchanger of the Ljungstrom or similar type containing a body of heat exchange panels or elements each in accordance with the heat exchange panel or element as set forth in the first aspect of the invention herein.
- Figure 1 shows schematically a side elevation of a regenerative heat exchanger with heat exchange elements according to the present invention, part sectioned through section A-A of Figure 2;
- Figure 2 shows a plan view through section B-B of Figure 1;
- Figure 3 shows a perspective view of part of a heat exchange element
- Figure 4 shows a side view of an alternative form of heat exchange element
- Figure 5 shows a perspective view of part of yet another form of heat exchange element in accordance with the invention.
- a regenerative heat exchanger 1 comprises a drum 2 carried by a rotating shaft 3 and including peripheral pockets 4 housing removable heat exchange panels or elements 5.
- the heat exchange panels or elements 5 are arranged in packs in the pockets 4 with the panels or elements of each pack in contiguous relationship but with passages defined between them for the flow of gas, gas and vapour or air for heat exchange with the panels or elements.
- the panels or elements are corrugated, ridged or otherwise suitably profiled for the passages to be defined and for there to be turbulent flow of the gas, gas and vapour or air between the panels or elements.
- the heat exchanger 1 has a heat input side IA and a heat output side IB, and suitable ductings 6, 7 are provided for gas, gas and vapour or air flows (shown arrowed) through the drum 2 at these sides for heat exchange with the panels or elements 5.
- the drum 1 is rotated very slowly, e.g. less than 1 r.p. ., by the shaft 3.
- Each heat exchange panel or element 5 includes, as shown in Figures 3 and 4, a composite wall member 9 made from portions of different thermal conductivity, one portion of higher thermal conductivity comprising a metal mesh 10 of interwoven wire strands while a further wall portion 11 of lower thermal conductivity constitutes an encapsulating layer which completely covers and extends through the mesh.
- the two portions of the wall are thus soundly mechanically bonded together and so intimately interlocked that delamination of the portions is prevented.
- the covering of the encapsulating layer over the strands of the mesh is reduced to a very thin skin, preferably 0.1-0.3mm thick, which is substantially thinner than the thickness of the mesh and its strands, the skins outside the mesh being fused together by the material of the encapsulating layer through the openings between the strands of the mesh.
- the mesh 10 therefore, has a transverse extent across the depth of the wall member 9 substantially to the opposite outer surfaces or the wall member so that the mesh is able to conduct heat from the outer surfaces of the wall member into the body of the wall member to promote the heat absorption capacity of the wall member.
- the wall member 9 is incorporated, applied and fashioned into the panel or element to be suitable for application to the heat exchanger 1.
- the panel or element 5 includes a peripheral bead 5A around the wall member 9.
- the bead 5A may be omitted, if desired.
- the mesh may be made of strands of copper, aluminium, nickel, bronze or other strand material of high thermal conductivity.
- Glass may be used to form the encapsulating layer 11 instead of plastics material.
- the mesh 10 may comprise an arrangement of cross-laid strands 10* as shown in Figure 4.
- the mesh may be made of interwoven or cross-laid sheet metal strips.
- Another form of the composite wall member 9 is shown in Figure 5 of the accompanying drawings.
- the mesh 10 is formed from pierced and expanded metal sheet which though a unitary piece of material presents a network of strip or strand portions 10" across the length and breadth of the wall member.
- this mesh is formed from pierced, expanded and flattened metal sheet, for example steel or aluminium EXPAMET.
- the encapsulating layer 11 which also extends through the openings of the mesh to fuse together through the mesh the portions of the encapsulating layer at opposite sides of the mesh sheet and interlock the mesh and encapsulating layer inseparably together.
- the encapsulating layer 11 may include thin outer layers, as in the other embodiments described and illustrated.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB919126589A GB9126589D0 (en) | 1991-12-14 | 1991-12-14 | Wire mesh panels adapted for heat energy transfer and storage |
PCT/GB1993/001232 WO1994029660A1 (en) | 1991-12-14 | 1993-06-09 | Panel for regenerative heat-exchangers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0701679A1 true EP0701679A1 (en) | 1996-03-20 |
EP0701679B1 EP0701679B1 (en) | 1997-08-06 |
Family
ID=10706279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93913335A Expired - Lifetime EP0701679B1 (en) | 1991-12-14 | 1993-06-09 | Panel for regenerative heat-exchangers |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0701679B1 (en) |
JP (1) | JPH08511336A (en) |
AT (1) | ATE156585T1 (en) |
DE (1) | DE69312972T2 (en) |
ES (1) | ES2105274T3 (en) |
GB (2) | GB9126589D0 (en) |
WO (1) | WO1994029660A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9929408D0 (en) * | 1999-12-14 | 2000-02-09 | Maxwell Davidson Ltd | Composite material |
DE10233525A1 (en) * | 2002-07-23 | 2004-02-12 | Löffler, Michael, Dipl.-Ing. | Heat exchanger has a grid or series of heat storage grids made of metal positioned between the fluid inlet and outlet |
US7841390B1 (en) | 2003-03-03 | 2010-11-30 | Paragon Airheater Technologies, Inc. | Heat exchanger having powder coated elements |
US7819176B2 (en) * | 2003-03-03 | 2010-10-26 | Paragon Airheater Technologies, Inc. | Heat exchanger having powder coated elements |
JP5662545B1 (en) * | 2013-11-13 | 2015-01-28 | 多田 禮子 | High performance total heat exchanger |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD109947A1 (en) * | 1973-06-20 | 1974-11-20 | ||
SE7608330L (en) * | 1976-07-21 | 1978-01-22 | Munters Ab Carl | ROTOR FOR REGENERATIVE MOISTURE RESP. HEAT EXCHANGER |
CH628730A5 (en) * | 1977-06-02 | 1982-03-15 | Alusuisse | STRIP FOR MAKING BODY FOR EXCHANGE OF SENSIBLE AND LATENT HEAT IN A REGENERATIVE HEAT EXCHANGER. |
SE7808367L (en) * | 1978-08-03 | 1980-02-04 | Ostbo John D B | DEVICE EXCHANGER |
GB2099973A (en) * | 1981-05-08 | 1982-12-15 | Applegate G | Thermal regenerator media |
DE3124379A1 (en) * | 1981-06-22 | 1983-02-03 | Oleg 5000 Köln Stolz | Heat exchanger with a small overall volume and weight |
GB2182863A (en) * | 1985-10-24 | 1987-05-28 | Howden James & Co Ltd | Producing reinforced plastics members |
-
1991
- 1991-12-14 GB GB919126589A patent/GB9126589D0/en active Pending
-
1992
- 1992-12-11 GB GB9225901A patent/GB2262334B/en not_active Expired - Fee Related
-
1993
- 1993-06-09 EP EP93913335A patent/EP0701679B1/en not_active Expired - Lifetime
- 1993-06-09 JP JP7501438A patent/JPH08511336A/en active Pending
- 1993-06-09 ES ES93913335T patent/ES2105274T3/en not_active Expired - Lifetime
- 1993-06-09 WO PCT/GB1993/001232 patent/WO1994029660A1/en active IP Right Grant
- 1993-06-09 DE DE69312972T patent/DE69312972T2/en not_active Expired - Fee Related
- 1993-06-09 AT AT93913335T patent/ATE156585T1/en active
Non-Patent Citations (1)
Title |
---|
See references of WO9429660A1 * |
Also Published As
Publication number | Publication date |
---|---|
GB2262334A (en) | 1993-06-16 |
WO1994029660A1 (en) | 1994-12-22 |
GB2262334B (en) | 1996-03-13 |
GB9225901D0 (en) | 1993-02-03 |
EP0701679B1 (en) | 1997-08-06 |
JPH08511336A (en) | 1996-11-26 |
DE69312972D1 (en) | 1997-09-11 |
GB9126589D0 (en) | 1992-02-12 |
ATE156585T1 (en) | 1997-08-15 |
DE69312972T2 (en) | 1997-12-18 |
ES2105274T3 (en) | 1997-10-16 |
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