WO2013012348A1 - Heat exchanger pipe - Google Patents

Heat exchanger pipe Download PDF

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Publication number
WO2013012348A1
WO2013012348A1 PCT/PL2012/000053 PL2012000053W WO2013012348A1 WO 2013012348 A1 WO2013012348 A1 WO 2013012348A1 PL 2012000053 W PL2012000053 W PL 2012000053W WO 2013012348 A1 WO2013012348 A1 WO 2013012348A1
Authority
WO
WIPO (PCT)
Prior art keywords
partition
pipe
pipe body
length
heat exchanger
Prior art date
Application number
PCT/PL2012/000053
Other languages
French (fr)
Inventor
Tomasz STEMIEŃCZUK
Original Assignee
Aic Sp. Z.O.O.
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 Aic Sp. Z.O.O. filed Critical Aic Sp. Z.O.O.
Priority to EP12745926.1A priority Critical patent/EP2734802A1/en
Publication of WO2013012348A1 publication Critical patent/WO2013012348A1/en

Links

Classifications

    • 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
    • F28D7/02—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 helically coiled
    • F28D7/022—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 helically coiled the conduits of two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0461—Combination of different types of heat exchanger, e.g. radiator combined with tube-and-shell heat exchanger; Arrangement of conduits for heat exchange between at least two media and for heat exchange between at least one medium and the large body of fluid
    • 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
    • F28D7/0008—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 for one medium being in heat conductive contact with the conduits for the other medium
    • 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

Definitions

  • the invention concerns a heat exchanger pipe designed particularly for heat exchange between two or three different agents.
  • the pipe is applicable particularly in fuel heat exchangers used in central heating installations.
  • WO 2005/088200 is a heat exchanger containing a pipe with an internal longitudinal partition, which divides the pipe inside into two separate ducts intended for the flow of the agent through the pipe.
  • the disclosed partition is given the form of a flat wall or a wall with indentations forming V-shaped sections, made of an elastic material, preferably rubber.
  • the purpose of this invention is to develop the pipe structure with two inner ducts so as to enable heat exchange between two or three agents, thus increasing the heat exchange coefficient as compared to the known solutions, and the strength parameters.
  • the heat exchanger pipe according to the invention containing an inner partition which divides the pipe inside into two separate ducts for the flow of the agent is characterised in that the partition is spiral in shape.
  • the partition is made of a rectangular metal strip curled around its vertical axis of symmetry.
  • the partition is connected tight to the pipe body along its whole length.
  • the partition may be of equal length or shorter than the pipe body.
  • the ratio between the partition's length of lay and the inner diameter of the pipe body is no less than 1 ⁇ 2, preferably 1 ⁇ 2.
  • the pipe is made of stainless steel.
  • the pipe according to the invention allows for heat exchange between three different agents i.e. the agents flowing in two separate ducts inside the pipe, and the agent flowing outside the pipe, without the mixing of the agents.
  • the connection between the partition and the pipe body, as well as the spiral shape of the partition increase the heat exchange surface.
  • the spiral partition forces turbulent flow of the agent(s) in the ducts inside the pipe, which improves the heat exchange parameters substantially.
  • connection between the partition and the pipe body contributes to a radical increase of the pipe strength, which enables using the pipe in high pressure systems or reducing the thickness of the pipe body, which in turn improves the heat exchange parameters.
  • Fig. 1 shows the partition partially fixed to the pipe body, viewed from the side;
  • Fig. 2 shows the pipe in the axial section with the partition shorter than the pipe body.
  • the pipe according to the invention presented on the exemplary Fig. 1 has its vertical axis of the body 2 made of stainless steel, circular in cross section, with the partition 1 fixed to it, where the partition is made of stainless steel and given the shape of a spiral formed by curling a rectangular strip of steel sheet around symmetry.
  • the partition may be curled either clockwise, or anticlockwise.
  • the partition 1 may be of the same length as the pipe body 2 or shorter, as shown on Fig. 2, and the distance x between the partition 1 and the upper front surface of the pipe body 2, and the distance y between the partition 1 and the bottom front surface of the pipe body 2 may be of any length.
  • the length of lay s of the partition 1 curls has a substantial impact on the velocity of the flowing agent and its agitation. It has been experimentally established that the ratio between the length of lay s of the partition 1 curl and the inner diameter 2 of the pipe body 2 should be at least 1 ⁇ 2, preferably 1 ⁇ 2.
  • the partition 1 is permanently connected to the pipe body by e.g. soldering or welding, preferably along its whole length.
  • the partition 1 divides the pipe body 2 inside into two tight ducts for simultaneous flow of the same agent, or for the flow of a different agent in each duct.
  • the pipes according to the invention are connected to the combustion chamber.
  • the gases formed in the combustion chamber are transported down the pipes in the direction of the funnel connection and the condensate accumulation bowl.
  • the partition 1 agitates the flowing gases which cool down giving away their heat to the heated agent. In this case the gases are cooled down below the dew-point temperature, which causes condensation of the water vapour contained therein and the formation of the condensate being a blend of water and aggressive products of the combustion process.

Landscapes

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

Abstract

The heat exchanger pipe contains the body (2) and the partition (1) dividing it inside into two separate ducts for the flow of the agent. The partition (1) is spiral in shape and preferably is made of a rectangular metal strip curled around its vertical axis of symmetry and connected tight to the pipe body (2) along its whole length. The partition (1) may be of equal length as the pipe body (2) or shorter, where the ratio between the length of lay (2) of the curl of the partition (1) and the inner diameter (d) of the pipe body (2) is no less than ½, preferably ½. Preferably, the pipe is made of stainless steel.

Description

Heat exchanger pipe
The invention concerns a heat exchanger pipe designed particularly for heat exchange between two or three different agents. The pipe is applicable particularly in fuel heat exchangers used in central heating installations.
Known from the patent specification WO 2005/088200 (PCT/DK2005/000179) is a heat exchanger containing a pipe with an internal longitudinal partition, which divides the pipe inside into two separate ducts intended for the flow of the agent through the pipe. The disclosed partition is given the form of a flat wall or a wall with indentations forming V-shaped sections, made of an elastic material, preferably rubber.
The purpose of this invention is to develop the pipe structure with two inner ducts so as to enable heat exchange between two or three agents, thus increasing the heat exchange coefficient as compared to the known solutions, and the strength parameters.
The heat exchanger pipe according to the invention, containing an inner partition which divides the pipe inside into two separate ducts for the flow of the agent is characterised in that the partition is spiral in shape.
Preferably, the partition is made of a rectangular metal strip curled around its vertical axis of symmetry.
Preferably, the partition is connected tight to the pipe body along its whole length. The partition may be of equal length or shorter than the pipe body.
The ratio between the partition's length of lay and the inner diameter of the pipe body is no less than ½, preferably ½.
Preferably, the pipe is made of stainless steel.
The pipe according to the invention allows for heat exchange between three different agents i.e. the agents flowing in two separate ducts inside the pipe, and the agent flowing outside the pipe, without the mixing of the agents. Moreover, the connection between the partition and the pipe body, as well as the spiral shape of the partition increase the heat exchange surface. Moreover, the spiral partition forces turbulent flow of the agent(s) in the ducts inside the pipe, which improves the heat exchange parameters substantially.
The connection between the partition and the pipe body contributes to a radical increase of the pipe strength, which enables using the pipe in high pressure systems or reducing the thickness of the pipe body, which in turn improves the heat exchange parameters.
The invention will now be described by way of example and with reference to the accompanying drawing in which:
Fig. 1 shows the partition partially fixed to the pipe body, viewed from the side; and
Fig. 2 shows the pipe in the axial section with the partition shorter than the pipe body.
The pipe according to the invention presented on the exemplary Fig. 1 has its vertical axis of the body 2 made of stainless steel, circular in cross section, with the partition 1 fixed to it, where the partition is made of stainless steel and given the shape of a spiral formed by curling a rectangular strip of steel sheet around symmetry. The partition may be curled either clockwise, or anticlockwise.
The partition 1 may be of the same length as the pipe body 2 or shorter, as shown on Fig. 2, and the distance x between the partition 1 and the upper front surface of the pipe body 2, and the distance y between the partition 1 and the bottom front surface of the pipe body 2 may be of any length. The length of lay s of the partition 1 curls has a substantial impact on the velocity of the flowing agent and its agitation. It has been experimentally established that the ratio between the length of lay s of the partition 1 curl and the inner diameter 2 of the pipe body 2 should be at least ½, preferably ½.
The partition 1 is permanently connected to the pipe body by e.g. soldering or welding, preferably along its whole length. The partition 1 divides the pipe body 2 inside into two tight ducts for simultaneous flow of the same agent, or for the flow of a different agent in each duct.
The pipes according to the invention are connected to the combustion chamber. The gases formed in the combustion chamber are transported down the pipes in the direction of the funnel connection and the condensate accumulation bowl. The partition 1 agitates the flowing gases which cool down giving away their heat to the heated agent. In this case the gases are cooled down below the dew-point temperature, which causes condensation of the water vapour contained therein and the formation of the condensate being a blend of water and aggressive products of the combustion process.

Claims

Claims
1. A heat exchanger pipe containing the partition dividing it inside into two separate ducts for the flow of the agent, characterised in that the partition (1) is spiral in shape.
2. The pipe according to Claim 1, characterised in that the partition (1) is made of a rectangular metal strip curled around its vertical axis of symmetry.
3. The pipe according to Claims 1 or 2, characterised in that the partition (1) is connected tight to the pipe body (2) along its whole length.
4. The pipe according to Claims 1 to 3, characterised in that the partition (1) is of the same length as the pipe body (2).
5. The pipe according to Claims 1 to 4, characterised in that the partition (1) is shorter than the pipe body (2).
6. The pipe according to Claims 1 to 5, characterised in that the ratio between the length of lay (2) of the curl of the partition (1) and the inner diameter (d) of the pipe body (2) is no less than ½, preferably ½.
7. The pipe according to Claims 1 to 6, characterised in that it is made of stainless steel.
PCT/PL2012/000053 2011-07-21 2012-07-11 Heat exchanger pipe WO2013012348A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12745926.1A EP2734802A1 (en) 2011-07-21 2012-07-11 Heat exchanger pipe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PLP.395724 2011-07-21
PL395724A PL220701B1 (en) 2011-07-21 2011-07-21 Heat exchanger tube

Publications (1)

Publication Number Publication Date
WO2013012348A1 true WO2013012348A1 (en) 2013-01-24

Family

ID=46642604

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/PL2012/000053 WO2013012348A1 (en) 2011-07-21 2012-07-11 Heat exchanger pipe

Country Status (3)

Country Link
EP (1) EP2734802A1 (en)
PL (1) PL220701B1 (en)
WO (1) WO2013012348A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3030415A1 (en) * 1980-08-12 1982-04-22 Uwe 7210 Rottweil Klix Heat exchanger for domestic heating system - has dividing wall with large surface area for maximum heat transfer
WO1995014887A1 (en) * 1993-11-27 1995-06-01 Kangyuan Chen Balanced device with separated channel for inlet and exit gas
JP2001201275A (en) * 2000-01-21 2001-07-27 Daikin Ind Ltd Double tube heat exchanger
WO2005088200A1 (en) 2004-03-18 2005-09-22 Danfoss A/S A heat exchanger
DE202011002985U1 (en) * 2011-02-16 2011-08-29 Peter Michael Rust Heat exchanger for heat energy savings

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3030415A1 (en) * 1980-08-12 1982-04-22 Uwe 7210 Rottweil Klix Heat exchanger for domestic heating system - has dividing wall with large surface area for maximum heat transfer
WO1995014887A1 (en) * 1993-11-27 1995-06-01 Kangyuan Chen Balanced device with separated channel for inlet and exit gas
JP2001201275A (en) * 2000-01-21 2001-07-27 Daikin Ind Ltd Double tube heat exchanger
WO2005088200A1 (en) 2004-03-18 2005-09-22 Danfoss A/S A heat exchanger
DE202011002985U1 (en) * 2011-02-16 2011-08-29 Peter Michael Rust Heat exchanger for heat energy savings

Also Published As

Publication number Publication date
PL395724A1 (en) 2013-02-04
EP2734802A1 (en) 2014-05-28
PL220701B1 (en) 2015-12-31

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