EP0690281A1 - Method for construction of a heat exchanger and a heat exchanger - Google Patents

Method for construction of a heat exchanger and a heat exchanger Download PDF

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Publication number
EP0690281A1
EP0690281A1 EP95201661A EP95201661A EP0690281A1 EP 0690281 A1 EP0690281 A1 EP 0690281A1 EP 95201661 A EP95201661 A EP 95201661A EP 95201661 A EP95201661 A EP 95201661A EP 0690281 A1 EP0690281 A1 EP 0690281A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
casting
liquid pipe
mould
liquid
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
Application number
EP95201661A
Other languages
German (de)
French (fr)
Other versions
EP0690281B1 (en
Inventor
Harm Bosscher
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.)
Intergas Heating Assets BV
Original Assignee
Intergas 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 Intergas BV filed Critical Intergas BV
Publication of EP0690281A1 publication Critical patent/EP0690281A1/en
Application granted granted Critical
Publication of EP0690281B1 publication Critical patent/EP0690281B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0072—Casting in, on, or around objects which form part of the product for making objects with integrated channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0063—Casting in, on, or around objects which form part of the product finned exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/38—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water contained in separate elements, e.g. radiator-type element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F7/00—Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
    • F28F7/02—Blocks traversed by passages for heat-exchange media

Definitions

  • the invention relates to a method for manufacturing a heat exchanger, and to a heat exchanger manufactured according to this method.
  • the present invention has for its object to provide a method with which it is possible in simple manner to arrange at least one duct in a casting, wherein the material of the duct wall can differ as desired from the casting material.
  • the invention has the further object of providing a compact heat exchanger manufactured according to this method.
  • the present invention provides for this purpose a method for manufacturing a heat exchanger by successively:
  • the invention further provides a heat exchanger manufactured according to this method, characterized in that the casting is provided on at least one side with a profiled surface.
  • the casting is provided on at least one side with a profiled surface.
  • a preferred embodiment of the heat exchanger is characterized in that the profiled surface comprises a substantially lengthwise oriented profile and the liquid pipe is arranged in the casting substantially perpendicularly of the lengthwise oriented profile.
  • Another preferred embodiment of the heat exchanger is characterized in that at least two liquid pipes are arranged in the casting.
  • This heat exchanger can be applied for combined heating of a plurality of liquids, wherein can be envisaged use in a so-called combi-boiler for heating tap water and water of a central heating system.
  • Both pipes are encased with casting material and mutually separated by casting material, whereby the danger of leakages is very small.
  • Yet another preferred embodiment of the heat exchanger is characterized in that the liquid pipes are arranged practically parallel to each other in the casting. This step enables arrangement of relatively long pipes in the casting, which will enhance the efficiency of the heat exchanger.
  • the casting is preferably manufactured from aluminium.
  • the liquid pipe is preferably manufactured from copper or stainless steel. Aluminium has the advantage that it has good heat-exchanging properties with a relatively small specific mass. Copper and stainless steel have the advantage that they are not rapidly affected by aggressive liquids.
  • Fig. 1 shows a round heat exchanger 1 according to the invention in which is placed a burner 2.
  • the burner 2 is connected to a mixing chamber 3 to which air and flammable gas are supplied via an air inlet 4 and a flammable gas inlet 5.
  • the inner surface of heat exchanger 1 is provided with ribs 6 which enlarge the heat-exchanging surface.
  • the ribs 6 form part of casting 7 in which two liquid pipes 8, 9 are arranged.
  • Liquid pipe 8 herein forms the conduit through which water of a central heating system is carried, while liquid pipe 9 forms the conduit through which flows tap water for heating.
  • the liquid in liquid pipes 8, 9 flows spirally upward from below as according to arrows S1, S2.
  • the combustion gases flow downward from above as according to arrow S3, whereby the heating medium and the media for heating flow in opposing directions.
  • the cooled combustion gases are further discharged via an outlet 10. Due to the high efficiency it is probable that condensation occurs on the underside of heat exchanger 1 and in outlet 10. Condensed liquid is drained via a condensation drain 11.
  • Fig. 2 shows a flat heat exchanger 12 comprising a casting 13 of which ribs 14 form part and two liquid pipes 15, 16 incorporated in a casting 13.
  • Liquid pipes 15, 16 are incorporated in casting 13 such that the heat-exchanging surface is large.
  • liquid pipes 15, 16 are incorporated in casting 13 in zigzag form.
  • the flow direction of the liquid in the liquid pipes is indicated with arrows S4, S5, while arrow S6 indicates the flow direction of the combustion gas.
  • Use is also made in this situation of the counterflow principle to optimize the efficiency of heat exchanger 12.
  • the heat exchanger 12 shown in this figure can for instance be incorporated into a so-called combi-boiler for household use.
  • Fig. 3 shows a mould 17 with which the heat exchanger 12 shown in fig. 2 can be manufactured.
  • the liquid pipes 15, 16 are already arranged in the mould 17.
  • Casting material will subsequently be poured into mould 17 via an opening 18.
  • a profiled mould wall 19 comprises a main profile 20 whereby the ribs 14 are formed.
  • a top plate 21 is removed, whereafter the casting 13 with the pipes 15, 16 arranged therein is removed together with side walls 22, 23 from the mould 17. Finally, the side walls 22, 23 are taken from the casting.
  • Such a method is also known as investment casting method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to a method for manufacturing a heat exchanger by successively:
  • shaping at least one liquid pipe into a desired form,
  • placing at least a part of the liquid pipe into a mould determining the form of the heat-exchanging surface,
  • pouring casting material into the mould,
  • causing the casting material to pass into a solid state, and
  • removing from the mould the casting with the liquid pipe incorporated therein.
The invention further relates to a heat exchanger manufactured in accordance with this method.

Description

  • The invention relates to a method for manufacturing a heat exchanger, and to a heat exchanger manufactured according to this method.
  • Existing heat exchangers, for instance for use in a heating boiler for heating water of a central heating system and/or tap water, are usually cast round a sand core. Using the sand core a duct can be left free in the casting which can form for instance the duct for water of a central heating system or tap water. A drawback of this method is that it is relatively labour-intensive to first manufacture and then remove a sand core from the casting. Another drawback to this method is that the duct wall is formed by the casting. The material properties of the wall of the duct are thus determined by the choice of material for the casting material. This causes problems in practice. An aluminium duct wall is thus undesirable in the case of a liquid for transporting which has a pH greater than 8.5; this can occur with water in a closed central heating circuit, while aluminium is very suitable as casting material.
  • The present invention has for its object to provide a method with which it is possible in simple manner to arrange at least one duct in a casting, wherein the material of the duct wall can differ as desired from the casting material. The invention has the further object of providing a compact heat exchanger manufactured according to this method.
  • The present invention provides for this purpose a method for manufacturing a heat exchanger by successively:
    • shaping at least one liquid pipe into a desired form,
    • placing at least a part of the liquid pipe into a mould determining the form of the heat-exchanging surface,
    • pouring casting material into the mould,
    • causing the casting material to pass into a solid state, and
    • removing from the mould the casting with the liquid pipe incorporated therein.
  • The invention further provides a heat exchanger manufactured according to this method, characterized in that the casting is provided on at least one side with a profiled surface. By placing at least a part of the liquid pipe in the mould the sand core has become superfluous. Another advantage is that different materials are chosen for the duct wall and the casting material. It thus becomes possible to optimize these materials. The method further allows great freedom in respect of the form and the position of the duct in the casting. The heat exchanger thus has at least one profiled side without the direction of the duct, i.e. the position of the liquid pipe, being hereby determined. It is moreover possible to embody the heat exchanger very compactly.
  • A preferred embodiment of the heat exchanger is characterized in that the profiled surface comprises a substantially lengthwise oriented profile and the liquid pipe is arranged in the casting substantially perpendicularly of the lengthwise oriented profile. With this construction it is possible to realize greater efficiency using the counterflow principle. By supplying a heating gas in lengthwise direction along the lengthwise oriented profile and supplying a counterflow liquid through the liquid pipe a high efficiency can be realized due in part to the comparatively large heat-exchanging surfaces.
  • Another preferred embodiment of the heat exchanger is characterized in that at least two liquid pipes are arranged in the casting. This heat exchanger can be applied for combined heating of a plurality of liquids, wherein can be envisaged use in a so-called combi-boiler for heating tap water and water of a central heating system. Both pipes are encased with casting material and mutually separated by casting material, whereby the danger of leakages is very small.
  • Yet another preferred embodiment of the heat exchanger is characterized in that the liquid pipes are arranged practically parallel to each other in the casting. This step enables arrangement of relatively long pipes in the casting, which will enhance the efficiency of the heat exchanger.
  • The casting is preferably manufactured from aluminium. The liquid pipe is preferably manufactured from copper or stainless steel. Aluminium has the advantage that it has good heat-exchanging properties with a relatively small specific mass. Copper and stainless steel have the advantage that they are not rapidly affected by aggressive liquids.
  • The present invention will be further elucidated with reference to the non-limitative embodiments shown in the following figures. Herein:
    • fig. 1 shows a partly cut away perspective view of a burner with a round heat exchanger according to the invention;
    • fig. 2 shows a partly cut away perspective view of a flat heat exchanger according to the invention; and
    • fig. 3 shows a perspective view of a mould for manufacturing the heat exchanger of fig. 2.
  • Fig. 1 shows a round heat exchanger 1 according to the invention in which is placed a burner 2. The burner 2 is connected to a mixing chamber 3 to which air and flammable gas are supplied via an air inlet 4 and a flammable gas inlet 5. The inner surface of heat exchanger 1 is provided with ribs 6 which enlarge the heat-exchanging surface. The ribs 6 form part of casting 7 in which two liquid pipes 8, 9 are arranged. Liquid pipe 8 herein forms the conduit through which water of a central heating system is carried, while liquid pipe 9 forms the conduit through which flows tap water for heating. The liquid in liquid pipes 8, 9 flows spirally upward from below as according to arrows S₁, S₂. The combustion gases flow downward from above as according to arrow S₃, whereby the heating medium and the media for heating flow in opposing directions. The cooled combustion gases are further discharged via an outlet 10. Due to the high efficiency it is probable that condensation occurs on the underside of heat exchanger 1 and in outlet 10. Condensed liquid is drained via a condensation drain 11.
  • Fig. 2 shows a flat heat exchanger 12 comprising a casting 13 of which ribs 14 form part and two liquid pipes 15, 16 incorporated in a casting 13. Liquid pipes 15, 16 are incorporated in casting 13 such that the heat-exchanging surface is large. To this end liquid pipes 15, 16 are incorporated in casting 13 in zigzag form. The flow direction of the liquid in the liquid pipes is indicated with arrows S₄, S₅, while arrow S₆ indicates the flow direction of the combustion gas. Use is also made in this situation of the counterflow principle to optimize the efficiency of heat exchanger 12. The heat exchanger 12 shown in this figure can for instance be incorporated into a so-called combi-boiler for household use.
  • Fig. 3 shows a mould 17 with which the heat exchanger 12 shown in fig. 2 can be manufactured. The liquid pipes 15, 16 are already arranged in the mould 17. Casting material will subsequently be poured into mould 17 via an opening 18. A profiled mould wall 19 comprises a main profile 20 whereby the ribs 14 are formed. After the casting material introduced into the mould 17 has hardened a top plate 21 is removed, whereafter the casting 13 with the pipes 15, 16 arranged therein is removed together with side walls 22, 23 from the mould 17. Finally, the side walls 22, 23 are taken from the casting. Such a method is also known as investment casting method.

Claims (7)

  1. Method for manufacturing a heat exchanger by successively:
    - shaping at least one liquid pipe into a desired form,
    - placing at least a part of the liquid pipe into a mould determining the form of the heat-exchanging surface,
    - pouring casting material into the mould,
    - causing the casting material to pass into a solid state, and
    - removing from the mould the casting with the liquid pipe incorporated therein.
  2. Heat exchanger manufactured in accordance with the method in claim 1, characterized in that the casting is provided on at least one side with a profiled surface.
  3. Heat exchanger as claimed in claim 2, characterized in that the profiled surface comprises a substantially lengthwise oriented profile and the liquid pipe is arranged in the casting substantially perpendicularly of the lengthwise oriented profile.
  4. Heat exchanger as claimed in claim 2 or 3, characterized in that at least two liquid pipes are arranged in the casting.
  5. Heat exchanger as claimed in claim 4, characterized in that the liquid pipes are arranged practically parallel to each other in the casting.
  6. Heat exchanger as claimed in any of the claims 2-5, characterized in that the casting is manufactured from aluminium.
  7. Heat exchanger as claimed in any of the claims 2-6, characterized in that the liquid pipe is manufactured from copper or stainless steel.
EP95201661A 1994-06-27 1995-06-19 Method for construction of a heat exchanger and a heat exchanger Expired - Lifetime EP0690281B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9401061A NL9401061A (en) 1994-06-27 1994-06-27 Method for manufacturing a heat exchanger and a heat exchanger.
NL9401061 1994-06-27

Publications (2)

Publication Number Publication Date
EP0690281A1 true EP0690281A1 (en) 1996-01-03
EP0690281B1 EP0690281B1 (en) 1999-12-08

Family

ID=19864364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95201661A Expired - Lifetime EP0690281B1 (en) 1994-06-27 1995-06-19 Method for construction of a heat exchanger and a heat exchanger

Country Status (4)

Country Link
EP (1) EP0690281B1 (en)
AT (1) ATE187548T1 (en)
DE (1) DE69513734T2 (en)
NL (1) NL9401061A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2072931A2 (en) 2007-12-21 2009-06-24 A.M. S.R.L. Heat exchanger particularly suitable for the construction of high-efficiency so-called condensing type heating boilers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019112147A1 (en) * 2019-05-09 2020-11-12 Julius Schüle Druckguss GmbH Method for casting a pipeline into a component to be produced by means of a die-casting process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985001101A1 (en) * 1983-08-26 1985-03-14 Oestbo Karl A heat exchanger
US4865112A (en) * 1988-07-07 1989-09-12 Schwarb Foundry Company Method of casting metals with integral heat exchange piping
EP0495762A1 (en) * 1991-01-15 1992-07-22 Nordinvent S.A. A heat exchanger element
US5305818A (en) * 1990-08-02 1994-04-26 Montupet S.A. Process for producing a moulded part, made of aluminium or an aluminium alloy, equipped with integrated channels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985001101A1 (en) * 1983-08-26 1985-03-14 Oestbo Karl A heat exchanger
US4865112A (en) * 1988-07-07 1989-09-12 Schwarb Foundry Company Method of casting metals with integral heat exchange piping
US5305818A (en) * 1990-08-02 1994-04-26 Montupet S.A. Process for producing a moulded part, made of aluminium or an aluminium alloy, equipped with integrated channels
EP0495762A1 (en) * 1991-01-15 1992-07-22 Nordinvent S.A. A heat exchanger element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2072931A2 (en) 2007-12-21 2009-06-24 A.M. S.R.L. Heat exchanger particularly suitable for the construction of high-efficiency so-called condensing type heating boilers

Also Published As

Publication number Publication date
NL9401061A (en) 1996-02-01
ATE187548T1 (en) 1999-12-15
DE69513734D1 (en) 2000-01-13
DE69513734T2 (en) 2000-04-06
EP0690281B1 (en) 1999-12-08

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