EP1317648B1 - Heat exchanger and heating system equipped therewith - Google Patents

Heat exchanger and heating system equipped therewith Download PDF

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Publication number
EP1317648B1
EP1317648B1 EP01976933A EP01976933A EP1317648B1 EP 1317648 B1 EP1317648 B1 EP 1317648B1 EP 01976933 A EP01976933 A EP 01976933A EP 01976933 A EP01976933 A EP 01976933A EP 1317648 B1 EP1317648 B1 EP 1317648B1
Authority
EP
European Patent Office
Prior art keywords
duct
medium
heat exchanger
flow direction
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
EP01976933A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1317648A2 (en
Inventor
Willem Meijer
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.)
3F HOLDING BV
Original Assignee
3F HOLDING 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 3F HOLDING BV filed Critical 3F HOLDING BV
Publication of EP1317648A2 publication Critical patent/EP1317648A2/en
Application granted granted Critical
Publication of EP1317648B1 publication Critical patent/EP1317648B1/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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
    • 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
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F28D21/0007—Water heaters
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • 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
    • F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular

Definitions

  • the invention relates to a method of manufacturing a heat exchanger that comprises at least one first duct for a first medium and at least one second duct for a second medium in heat-exchanging contact therewith via at least one wall, said method including choosing the dimensions of at least the first duct in the flow direction of the first medium and perpendicularly thereof. Such a method is generally used for manufacturing.
  • US-A-5 121 792 proposes a heat exchanger design having narrow ducts that converge in the inflow direction and diverge in the outflow direction. These ducts are intended at some point to become narrower than the thickness of the boundary layer developing therein.
  • the invention has for its object to provide a manufacturing method that will yield a heat exchanger with an increased efficiency.
  • An improved heat exchanger as manufactured using this method can take a more compact form compared to known heat exchangers as described above and still have the same heat transfer capacity.
  • the method of manufacturing the heat exchanger advantageously includes placing a plurality of first ducts in series as seen in the flow direction, and arranging means in each case between successive ducts for enhancing the heat transfer inside the first medium.
  • the transfer-enhancing means can herein comprise a space with an enlarged cross-section compared to the first ducts.
  • the length of the first ducts can be kept relatively short.
  • the invention also relates to a method of manufacturing a heating system incorporating a heat exchanger manufactured by the above described method, as well as a method of using such a heat exchanger.
  • a heat exchanger 1 (fig. 1) according to the invention comprises a number of first ducts 2 for a first medium, for instance flue gas from a burner 7, and a number of second ducts 4 for a second medium which is in heat-exchanging contact with the first medium, for instance water intended for radiators of a heating system (not shown here).
  • Ducts 2 and 4 are physically separated from each other by walls 5 which are readily permeable to heat and are for instance manufactured from a metal.
  • the first ducts 2 are connected on one side to a space 6 in which a burner 7 Is arranged, and on the other side to an outlet 8.
  • Ducts 4 are included in a closed circuit of the heating system and connected to an inlet 9 and an outlet 10.
  • first ducts 2 in the flow direction of the medium (arrow F) and perpendicularly thereof are chosen such that the boundary layers 11 formed along walls 5 of these ducts 2 just make mutual contact at the end of each duct 2.
  • Optimum benefit is in this way gained from the transport of the medium transversely of its main flow direction during the creation and development of boundary layers 11.
  • Means are herein preferably present at the end of each duct 2 for enhancing the heat transfer inside the medium, for instance in the form of a part 12 with enlarged cross-section. In the shown embodiment this part 12 forms a bend between two successive ducts 2 as seen in the flow direction. Owing to the enlarged cross-section of part 12 and the flow phenomena resulting therefrom, additional movement components are introduced into the flow which enhance the heat transfer.
  • the boundary layers 11 (fig. 2) thus develop along walls 5 of each duct 2 from the inflow side, whereby the effective surface area of each duct 2 becomes increasingly smaller.
  • the medium flowing therethrough is hereby urged toward the middle of duct 2, and this forced transport transversely of flow direction F causes a heat transport in the same direction, whereby the efficiency of heat exchanger 1 is greatly increased.
  • the velocity curve in transverse direction of duct 2 herein changes from a completely uniform velocity over the whole surface into a parabolic velocity distribution with a low speed (practically zero) along walls 5 and a higher speed in the middle of duct 2.
  • each boundary layer 11 along two opposite walls 5 of each duct 2 make mutual contact when the thickness ⁇ of each boundary layer 11 amounts to half the distance D between these walls 5.
  • x 0.5 ⁇ D ⁇ R x / k
  • This distance x therefore forms in principle the optimal length of duct 2 with an eye to the heat transfer inside one of the media themselves.
  • the length of duct 2 must also be sufficient to enable the intended heat transfer between the two media flowing through the exchanger.
  • the choice of the length of duct 2 will therefore often have to be slightly larger in practice than would follow from the above relation. This length may not however become so great as to result in the danger of transition of the flow from laminar to turbulent, since the flow losses in heat exchanger 1 would thereby increase greatly.
  • the duct length wherein the boundary layers 11 just make mutual contact is shown (fig. 3) as a function of the undisturbed flow velocity of the medium for a number of different media.
  • D hydr flow surface area divided by circumference
  • fig. 3 The duct length wherein the boundary layers 11 just make mutual contact, expressed as multiple of the hydraulic cross-section D hydr (flow surface area divided by circumference) of duct 2, is shown (fig. 3) as a function of the undisturbed flow velocity of the medium for a number of different media.
  • the progression of the relevant curves is found to depend on the nature of the medium, wherein the kinematic viscosity determines the gradient of the curves.
  • gases such as flue gases and thermal oil
  • a relatively short length of the ducts 2 is found to be ideal over a wide range of flow velocities.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Central Heating Systems (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP01976933A 2000-09-05 2001-09-05 Heat exchanger and heating system equipped therewith Expired - Lifetime EP1317648B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1016104 2000-09-05
NL1016104A NL1016104C1 (nl) 2000-09-05 2000-09-05 Warmtewisselaar en daarmee uitgerust verwarmingssysteem.
PCT/NL2001/000658 WO2002021063A2 (en) 2000-09-05 2001-09-05 Heat exchanger and heating system equipped therewith

Publications (2)

Publication Number Publication Date
EP1317648A2 EP1317648A2 (en) 2003-06-11
EP1317648B1 true EP1317648B1 (en) 2006-05-03

Family

ID=19772024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01976933A Expired - Lifetime EP1317648B1 (en) 2000-09-05 2001-09-05 Heat exchanger and heating system equipped therewith

Country Status (6)

Country Link
EP (1) EP1317648B1 (nl)
AT (1) ATE325324T1 (nl)
AU (1) AU2001296088A1 (nl)
DE (1) DE60119348T2 (nl)
NL (1) NL1016104C1 (nl)
WO (1) WO2002021063A2 (nl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008050153B4 (de) 2008-10-01 2022-02-03 Rational Ag Gargerät mit Wärmetauscherleitung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2254851A1 (de) * 1972-11-09 1974-05-30 Ahlmann Carlshuette Kg Waermeuebertrager mit treppenfoermigen oberflaechen
SU992993A2 (ru) * 1981-12-21 1983-01-30 Новополоцкий Политехнический Институт Им.Ленинского Комсомола Белоруссии Теплообменный элемент типа труба в трубе
DE3741869A1 (de) * 1987-12-10 1989-06-22 Juergen Schukey Gegenstrom-waermetauscher

Also Published As

Publication number Publication date
WO2002021063A2 (en) 2002-03-14
AU2001296088A1 (en) 2002-03-22
WO2002021063A3 (en) 2002-06-27
DE60119348T2 (de) 2007-05-10
EP1317648A2 (en) 2003-06-11
DE60119348D1 (de) 2006-06-08
NL1016104C1 (nl) 2002-03-07
ATE325324T1 (de) 2006-06-15

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