GB2424695A - A heat exchanger tube of a gas fired heater - Google Patents

A heat exchanger tube of a gas fired heater Download PDF

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Publication number
GB2424695A
GB2424695A GB0604818A GB0604818A GB2424695A GB 2424695 A GB2424695 A GB 2424695A GB 0604818 A GB0604818 A GB 0604818A GB 0604818 A GB0604818 A GB 0604818A GB 2424695 A GB2424695 A GB 2424695A
Authority
GB
United Kingdom
Prior art keywords
tube
baffle
longitudinal axis
valleys
peaks
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.)
Withdrawn
Application number
GB0604818A
Other versions
GB0604818D0 (en
Inventor
Kevin J Alphs
Robert S Cooley
Mark M Krupo
Norman E Mattson
James A Palmer
Harold M Sindelar
Michael D Strande
Colette L Van Beek
Gerald Ii Thomas
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.)
Modine Manufacturing Co
Original Assignee
Modine Manufacturing Co
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 Modine Manufacturing Co filed Critical Modine Manufacturing Co
Publication of GB0604818D0 publication Critical patent/GB0604818D0/en
Publication of GB2424695A publication Critical patent/GB2424695A/en
Withdrawn legal-status Critical Current

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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/003—Baffles or deflectors for air or combustion products; Flame shields in flue gas ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/06—Baffles or deflectors for air or combustion products; Flame shields in fire-boxes
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
    • F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
    • F24H3/087—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes using fluid fuel
    • 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
    • F28D3/00—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 flows in a continuous film, or trickles freely, over the conduits
    • F28D3/02—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 flows in a continuous film, or trickles freely, over the conduits with tubular conduits
    • 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
    • F28D7/08—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 otherwise bent, e.g. in a serpentine or zig-zag
    • 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
    • F28D7/08—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 otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—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 otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • F28D7/085—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 otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Fluid Mechanics (AREA)
  • Details Of Fluid Heaters (AREA)
  • Gas Burners (AREA)

Abstract

Heat exchanger tube(s) 18 communicating combustion gas flow from a burner (20, fig 2) of a gas fired heater (10, fig 1) comprises a corrugated baffle 40 disposed in the tube and the baffle 40 being defined as a corrugated strip (42, figs 8 - 11) with the corrugations (50) being arranged that they extend in a direction along a longitudinal axis 33 of the length of the tube 18. Corrugated baffle 40 may have edges (52) of peaks (44) and valleys (46) that may be in contact with the inner walls (54) of the tube 18. Peaks (44) and valleys (46) may be perpendicular to the longitudinal axis 33. Baffle 40 may be retained in the tube 18 by a mounting flange (56) as part of the strip (42) extending outside of the tube 18 and joined to a housing (12) of the heater (10) via a fastener extending through a hole (58) in the flange (56). Flange (56) may be replaced with a tab (60, figs 12 - 15) that engages with an annular recess (62) in the tube 18 with a spring force.

Description

* 2424695
IMPROVED BAFFLE DESIGN FOR A GAS-FIRED UNIT HEATER
BACKGROUND OF THE INVENTION
Gas-fired unit heaters are known and are commonly used to heat relatively large open and closed areas, such as residential and commercial garages or warehouses. Such units will often include a plurality of gas burners that combust natural or propane gas, with the heated combustion products being drawn through one or more heat exchange tubes by a exhaust blower or fan. Heat is transferred from the combustion products or flue gas to air that is passing over the 1 0 exterior of the heat exchanger tubes, with the heated air then flowing into the area that is to be heated.
Given the ever-increasing cost of heating fuel, such as natural and/or propane gas, there is a continuing need to improve the efficiency of such unit heaters, this includes the efficiency of the 1 5 transfer of heat from the combustion products to the air passing over the exterior of the tube.
SUMMARY OF THE INVENTION
In accordance with one form of the invention, a gas-fired unit heater is provided and includes a burner, a heat exchanger tube located to receive a flow of the combustion products from the burner, the tube including at least one linear tube run extending along a longitudinal axis, and a corrugated baffle received in the tube run. The tube run has an inner wall.
The baffle includes a corrugated strip of material having a length extending parallel to the longitudinal axes, with alternating peaks and valleys joined by side walls defining corrugations along the length and each of the peaks and valleys extending non-parallel to the longitudinal axis. In a preferred form, the peaks and valleys extend perpendicular to the longitudinal axis.
In one feature, opposite edges of the strip engage the inner wall of the tube run at at least one of the peaks and at at least one of the valleys.
In one feature, the inner wall is cylindrical with an inside diameter D. The corrugations have a height dimension H from the peaks to the valleys perpendicular to the longitudinal axis, and a width dimension W perpendicular to both the height dimension and the longitudinal axis. The ratio of (W x H)ID is in the range of 0.60 to 0.80.
In a highly preferred embodiment, the ratio of (W x H)/D is 0.66 within the range of normal manufacturing tolerances.
In one form, the gas-fired unit heater includes a blower and 1 5 is configured to provide a volumetric flow rate of the combustion products through the heat exchanger tube in the range of 2 cubic feet per minute (cfm) to 8 cfm under normal operating conditions, with a preferred optimum of 5 cfm.
As one feature, the inner waIl includes a recess and the corrugated strip of material includes a longitudinal end tab that is configured to engage in the recess to retain the baffle within the tube run. In a further feature, the recess is an annular relief in the inner wall of the tube run adjacent an outlet end of the tube run.
Other objects, advantages, and features of the invention will become apparent from a detailed review of the specification, including the appended claim and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of a unit heater including a baffle constructions embodying the present invention; Fig. 2 is a perspective view of selected components of the unit heater of Fig. 1; Fig. 3 is a reduced size, perspective view of a plurality of heat exchanger tubes of the unit heater of Fig. 1; Fig. 4 is a plan view of the heat exchanger tubes of Fig. 3; Fig. 5 is a side elevation of the heat exchanger tubes of Fig. 3; Fig. 6 is an end view of the heater exchanger tubes of Fig. 3; Fig. 7 is a reverse angle perspective view of the components of Fig. 2 with a heat exchanger tube broken away to reveal 1 5 a baffle; Fig. 8 is an enlarged section view of any one of the tubes taken from the line 8-8 in Fig. 5; Fig. 9 is a perspective view of one form of the baffle of Fig. 8 shown in smaller scale than Fig. 8; Fig. 1 0 is a side view of the baffle of Fig. 9 shown in larger scale than Fig. 9; Fig. 11 is a view taken from line 11-11 in Fig. 10; Fig. 12 is an enlarged section view of any of the tubes taken from the line 12-12 in Fig. 4 and showing another form of the bracket embodying the present invention; Fig. 1 3 is a view taken from line 1 3-1 3 in Fig. 1 2; Fig. 14 is a section view taken from line 14-14 in Fig. 12; -4-.
Fig. 15 is a side elevation view of the baffle of Fig. 12, removed from the tube run; and Fig. 1 6 is a section view of the burner box looking towards the inlets to the burners.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A unit heater 10 is shown in Fig. 1 and includes an outer housing 1 2 with a hot air outlet 1 4 that includes a plurality of louvers 16 (only one shown in Fig. 1) with a plurality of heat exchanger tubes 1 0 1 8 located within the housing 1 2 behind the outlet 1 4 such that air is heated as it flows over the heat exchanger tubes 1 8 and passes from the outlet 1 4 into an area or room to be heated. It should be understood that while the invention is described in connection with the illustrated embodiment of a unit heater 10, no limitation to a specific type or 1 5 construction of unit heater is intended unless expressly recited in the claims.
With reference to Fig. 2, the unit heater 10 includes a plurality of burners 20 (only one shown in Fig. 2), each aligned with an inlet opening 22 for a corresponding one of the heat exchanger tubes 1 8 such that hot combustion products from each of the burners 20 is received in the corresponding tube 18. The burners 20 are housed within a burner box 23, only part of which is shown in Fig. 2. The unit heater 10 further includes a fan or blower (power exhauster) 24 that draws the combustion products through the heat exchanger tubes 1 8 and blowing the combustion products (flue gases) from a flue collecting chamber 25 that gathers the combustion products as they exit each of the heat exchanger tubes 18. The blower 24 also serves to draw air into the unit heater 1 0 for combustion with the gas at the burners 1 2.
Each of the heat exchangers tubes 1 8 includes one or more linear tube runs 30, and in the case of the illustrated embodiment in Figs. 1 -7, each of the heat exchangers tubes 1 8 includes four linear tube runs 30A, 30B, 30C and 30D, with tube bends 32A, 32B and 32C connecting the tube runs 30A, 30B, 30C and 30D, as best seen in Fig. 3. Each of the tube runs 30A-30D extends along a corresponding longitudinal axis 33, as shown for the tube runs 30D in Fig. 3. Each of 1 0 the tubes 1 8 further includes an inlet end 34 at the end of the tube 1 8 opposite from an outlet end 36. It should be appreciated that by providing four of the tube runs 30 for each of the heat exchanger tubes 1 8, the inlet and outlet ends 34 and 36 can be located in the same plane. It should also be appreciated that an odd number of tube runs 30 1 5 would allow for the ends 34 and 36 to be located in spaced planes.
As best seen in Fig. 7, a corrugated or wave baffle 40 is provided in the tube run 30d of each of the heat exchanger tubes 1 8.
It has been found that the baffle 40 improves the heat transfer efficiency of the unit heat 1 0. As best seen in Figs. 9-1 2, The baffle 40 is preferable formed by a strip 42 of material having a length L extending parallel to the longitudinal axis 33, with alternating peaks 44 and valleys 46 joined by side walls 48 defining waves or corrugations along the length L. Each of the peaks 44 and valleys 46 extends non- parallel, and preferably perpendicular, to the longitudinal axis 33.
The corrugations have a height dimension H from the peaks 44 to the valleys 46 perpendicular to the longitudinal axis 33 and a width dimension W perpendicular to both the height dimension H and the longitudinal axes 33 It is preferred for the corrugations 50 to be sized and configured so that opposite edges 52 of the strip 42 engage an inner wall 54 of the tube run 30D at at least one of the peaks 44 and at at least one of the valleys 46. In this regard, each of the adjacent side walls have an angular spacing a which is preferably the same for each of the corrugations 50, except for one or more of the middle corrugations so which may have a smaller angle a so as to create the desired engagement of the side edges 52of the strip. This engagement can reduce or prevent rattling of the baffle 40 in the corresponding tube 18.
1 0 In a preferred embodiment, the angles a are in the range of 102 degrees to 121 degrees, with a preferred optimum of 109 degrees.
With or without the desired engagement, it is also preferred that the ratio of the multiple of the width W and the height H to the diameter D [(W x H)/D] be in the range of 0.60 to 0.80 with an 1 5 optimum being at 0.66 within the standard manufacturing tolerances of the baffle 40 and tube 1 8. These ranges create a desirable amount of free flow area 55 (illustrated with cross hatching in Fig. 8) between the baffle 42 and the inner wall 54 of the tube run 30D.
Preferably, the strip 42 is a strip of sheet metal with bends forming the alternating peaks 44 and valleys 46 of the corrugations 50 With reference to Figs. 9, 10 and 11, the illustrated baffle further includes a mount flange 56, which in the illustrated embodiment is part of the strip 42, and which extends outside of the outlet end 36 of the corresponding tube 1 8 so that it can be joined to the housing 1 2 using a suitable fastener (not shown) which extends through a mount hole 58 in the flange 56 to engage the housing 12.
This structure retains the baffle 40 in the tube run 30D.
With reference to Figs. 12-1 5, another embodiment of the baffle 40 is shown wherein the flange 56 is replaced by a longitudinal end tab 60 that is configured to engage in an annular recess 62 of the tube 1 8 with a spring force that is reacted through the baffle 40 to the edges 52 of the strip 42 that engage the inner wall 54 of the tube run 30D to retain the baffle 40 in the tube 1 8. This design has the benefit of being easily installed and not requiring a separate fastener. This design also can reduce or prevent rattling between the baffle 40 and the corresponding tube 1 8.
The blower 24 is sized to provide the movement of the combustion products from the flue collecting chamber 25 while sustaining the draft for the combustion process and entraining air for the combustion process. To accomplish this, the blower 24 must overcome the pressure resistance caused by the heat exchange tubes 18, the 1 5 baffles 40, the collecting chamber 25, the restriction of any vent associated with the chamber 25 or flue, the restriction associated with any vent terminal, and any reasonable natural external force. In this regard, in one preferred form, the blower 24 is sized to create a volumetric flow rate of the combustion products in the range of 2 CFM to 8 CFM through each of the tubes 18 under normal operating conditions, and in highly preferred form to deliver 5 CFM.
It should be understood that, while some of the drawings include specific numbers of the corrugations 50 and specific dimensions in inches and degrees for the baffle 40 and the tubes 1 8, these dimensions are for one preferred form of the unit heater 1 0, and that the specific dimensions and number of corrugations 50 required to optimize the efficiency of the unit heater 10 will be highly dependent upon the specific parameters of each application, including for example, the number of tube runs 30 in each tube 1 8, the length of the tube run(s) including the length of the tube run 30 in which the baffle 40 will be installed, the shape of the tube 1 8, the size of the inner wall 54, and the desired flow rate of the combustion products through each tube 18.
With reference to Figs. 2 and 1 6, another feature is the provision of a burner mount/secondary air bracket 64 that is designed to mount the burners 20 in their appropriate relationship to the tubes 1 8 while minimizing the disturbance of the secondary air flow that must flow past the burners 20 to the gaps 66 between the outlet ends of the 1 0 burners 20 and the openings 22. In order to provide as complete combustion as possible, it is important for the secondary air to be as undisturbed as possible over the entire 36O extent of the gap 66 as the secondary air flows into the combustion products exiting the burners 20 and entering the opening 22. To this end, the bracket 64 has been 1 5 designed so that it is spaced from the side waIls 68 of the burner box 23 to provide gaps 70 and 72 on either side of the bracket 64, and further have cutouts or window openings 74 and 76 so as to allow an air flow through the bracket 64 itself while still providing the appropriate structural integrity required for the bracket 64.

Claims (8)

1. A gas-fired unit heater comprising: a burner; a heat exchanger tube located to receive a combustion gas flow from the burner, the tube including at least one linear tube run extending along a longitudinal axis, the tube run having an inner wall; a corrugated baffle received in the tube run, the baffle comprising a corrugated strip of material having a length extending parallel to the 1 0 longitudinal axis, and alternating peaks and valleys joined by side walls defining corrugations along the length with each of the peaks and valleys being non-parallel to longitudinal axis.
2. The unit heater of claim 1 wherein opposite edges of the strip engaging the inner wall at at least one of the peaks and at at least 1 5 one of the valleys.
3. The unit heater of claim 1 wherein: the inner wall is cylindrical with an inside diameter D; the corrugations having a height dimension H from the peaks to the valleys perpendicular to the longitudinal axis and a width dimension W perpendicular to both the height dimension and the longitudinal axis; and the ratio of (W*H)/D is in the range of.60 to.80.
- 10 -
4. A corrugated baffle for use in a linear tube run of a gas-fired unit heater: the baffle comprising a corrugated strip of material having a length extending parallel to the longitudinal axis, and alternating peaks and valleys joined by side walls defining corrugations along the length with each of the peaks and valleys being non-parallel to longitudinal axis.
5. The baffle of claim 4 wherein opposite edges of the strip engaging the inner wall at at least one of the peaks and at at least one of the valleys.
6. The unit heater of claim 4 wherein: the inner wall is cylindrical with an inside diameter D; the corrugations having a height dimension H from the peaks to the valleys perpendicular to the longitudinal axis and a width dimension perpendicular to both the height dimension and the longitudinal axis; and the ratio of (W*H)/D is in the range of.60 to.80.
7. A gas-fired unit heater substantially as hereinbefore described with reference to, and as illustrated by, the accompanying drawings.
8. A corrugated baffle substantially as hereinbefore described with reference to, and as illustrated by, the accompanying drawings.
GB0604818A 2005-03-24 2006-03-10 A heat exchanger tube of a gas fired heater Withdrawn GB2424695A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66487805P 2005-03-24 2005-03-24

Publications (2)

Publication Number Publication Date
GB0604818D0 GB0604818D0 (en) 2006-04-19
GB2424695A true GB2424695A (en) 2006-10-04

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ID=36241334

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0604818A Withdrawn GB2424695A (en) 2005-03-24 2006-03-10 A heat exchanger tube of a gas fired heater

Country Status (3)

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US (1) US20060213499A1 (en)
CA (1) CA2541013A1 (en)
GB (1) GB2424695A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMC20090100A1 (en) * 2009-05-06 2010-11-07 Ergo S R L INDEPENDENT GAS HEATING UNIT WITH CONVECTION AND FORCED DRAFT.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1146162A (en) * 1965-12-27 1969-03-19 American Radiator & Standard Improvements in and relating to heat exchangers
JPS5924140A (en) * 1982-07-29 1984-02-07 Matsushita Electric Ind Co Ltd Heat exchanger
US6006741A (en) * 1998-08-31 1999-12-28 Carrier Corporation Secondary heat exchanger for condensing furnace

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4577681A (en) * 1984-10-18 1986-03-25 A. O. Smith Corporation Heat exchanger having a turbulator construction
EP0248629B1 (en) * 1986-06-04 1992-08-12 Ambi-Rad Limited Space heating appliance
US4794980A (en) * 1987-11-16 1989-01-03 Raydot Incorporated Air to air heat exchanger
US4823865A (en) * 1988-02-18 1989-04-25 A. O. Smith Corporation Turbulator construction for a heat exchanger
US5094224A (en) * 1991-02-26 1992-03-10 Inter-City Products Corporation (Usa) Enhanced tubular heat exchanger
US5271376A (en) * 1991-08-12 1993-12-21 Rheem Manufacturing Company Serpentined tubular heat exchanger apparatus for a fuel-fired forced air heating furnace
US5253635A (en) * 1992-04-29 1993-10-19 Canadian Gas Research Institute Gas-fired heater
JP2000146482A (en) * 1998-09-16 2000-05-26 China Petrochem Corp Heat exchanger tube, its manufacturing method, and cracking furnace or another tubular heating furnace using heat exchanger tube
US6484795B1 (en) * 1999-09-10 2002-11-26 Martin R. Kasprzyk Insert for a radiant tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1146162A (en) * 1965-12-27 1969-03-19 American Radiator & Standard Improvements in and relating to heat exchangers
JPS5924140A (en) * 1982-07-29 1984-02-07 Matsushita Electric Ind Co Ltd Heat exchanger
US6006741A (en) * 1998-08-31 1999-12-28 Carrier Corporation Secondary heat exchanger for condensing furnace

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Publication number Publication date
GB0604818D0 (en) 2006-04-19
US20060213499A1 (en) 2006-09-28
CA2541013A1 (en) 2006-09-24

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