EP1735577B1 - Heat exchanger and boiler comprising the heat exchanger - Google Patents

Heat exchanger and boiler comprising the heat exchanger Download PDF

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Publication number
EP1735577B1
EP1735577B1 EP05715136.7A EP05715136A EP1735577B1 EP 1735577 B1 EP1735577 B1 EP 1735577B1 EP 05715136 A EP05715136 A EP 05715136A EP 1735577 B1 EP1735577 B1 EP 1735577B1
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EP
European Patent Office
Prior art keywords
heat exchanger
exchanger according
tubes
boiler
surface enlarging
Prior art date
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Active
Application number
EP05715136.7A
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German (de)
English (en)
French (fr)
Other versions
EP1735577A1 (en
Inventor
Thomas Paarup Pedersen
Olav Knudsen
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.)
Alfa Laval Aalborg AS
Original Assignee
Alfa Laval Aalborg AS
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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
    • 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
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular 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
    • 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
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/124—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and being formed of pins
    • 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
    • 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
    • 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
    • F28D7/163—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 with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
    • 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
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/28—Safety or protection arrangements; Arrangements for preventing malfunction for preventing noise

Definitions

  • the present invention relates to heat exchangers, in particular to heat exchangers employed in boilers and exhaust gas boilers.
  • Tubes having surface enlarging elements such as pins used in boilers have been described in previous patent publications such as US 5,626,187 , WO 03/005467 A1 , WO 03/033969 A1 , WO 90/02916 A1 .
  • the present invention relates to boilers having a convection chamber including a number of tubes for the exchange of heat, specifically boilers including tubes fitted with surface enlarging elements such as a number of pins for the improved exchange of heat.
  • Solution strategies fall into four categories. The first, and most simple, is to reduce the noise after the source, e.g. by installation of a duct silencer in the exhaust from the boiler.
  • the second strategy is to introduce damping in the convection chamber, in order to prevent the acoustic response from reaching levels at which it can begin to significantly influence the unsteady flow structures that are its source, and thus to preclude feedback.
  • the third strategy is the introduction of dividing plates to move the frequencies of the modes that are prone to feedback out of the range of the excitation frequencies.
  • the fourth strategy is the modification of the pins to reduce the uncoupled excitation sufficiently that feedback never takes place or to disrupt the interaction mechanisms that are responsible for the transfer of energy from the mean flow to the fluctuating flow and acoustic fields.
  • a heat exchanger for exchanging heat between a first and a second medium comprising:
  • the plate dampens the noise generated in the boiler without causing an additional loss of pressure.
  • the tubes with the surface enlarging elements may be placed such that the highest number of tubes per area is achieved and thereby minimising the space between the surface enlarging elements.
  • the plate may comprise several pieces of material assembled into a single structure. Alternatively the plate is a unitary piece of material and may be bent or shaped such that the plate fits closely in the space between the tubes, e.g. between the surface enlarging elements.
  • the tubes may be arranged in the heat exchanger in a number of geometrical configurations such as placed side-by-side resulting in an overall geometry resembling a square or rectangular shape, preferably the tubes are configured in a honeycomb-like structure.
  • the surface enlarging elements may be formed by a sheet including a base part and a part including a number of elements having a free end.
  • the surface enlarging elements may be formed individually, e.g. the surface enlarging elements may be formed in a separate process and subsequently attached to the tube.
  • the surface enlarging element may be formed integrally with the tube.
  • the second unattached end is located upstream of the first end relative to the flow direction.
  • Surface enlarging elements know in the art have been orientated such that the free end of the surface enlarging element is located downsteam of the first end relative to the flow direction and subsequently problems with condensing water accumulating on the surface and in the joint of the surface enlarging element and the tube have been seen.
  • the surface enlarging elements have been orientated this way because assumptions were that this orientation would yield the lowest pressure drop whilst gaining maximum or near maximum heat transfer, however surprisingly it has been realised that orientating the surface enlarging elements this way has improved the noise level whilst the pressure drop remained the same.
  • the surface enlarging elements may be substantially tubular shaped.
  • the surface enlarging elements are preferably tubular shaped, i.e. pin shaped.
  • the cross section of the surface enlarging elements may take on other shapes, such as trapezoidal, square, rectangular, elliptical or any combination and/or variation thereof.
  • the surface enlarging element may define a length between the first and the second ends in the interval 10 to 60 mm, such as 20 to 55 mm, such as 40 to 50 mm, such as 41 to 50 mm, preferably 43 mm.
  • the length of the surface enlarging element may be the same for all surface enlarging elements or the length may vary, e.g. the surface enlarging elements may have two different lengths.
  • the length of the surface enlarging elements may increase or decrease along the tube.
  • the length of the surface enlarging elements may be random or pseudo randomly chosen.
  • the length of the surface enlarging elements may be varied as a function of the distance from a specific point on the tube, e.g. from the first surface-enlarging element.
  • the surface enlarging elements are made from steel, such as stainless steel, or alternatively aluminium or copper.
  • the surface enlarging elements are preferably made from a material having a melting point at a high temperature and having a high thermal conductivity.
  • the surface enlarging elements may define a curve.
  • the surface enlarging elements may define curves that are differentiable, or alternatively curves that include bends or breaks, the surface enlarging elements may further alternatively include a number of bends or breaks.
  • the sound suppressing plate includes a plurality of apertures having a size within the range 0,01 mm to 2 mm, such as 0,5 to 1,5 mm, such as 0,75 mm to 1,25 mm, preferably substantially equal to 1 mm.
  • the apertures of the sound suppressing plate may have different sizes, or all apertures may have substantially the same size.
  • the placement or distribution of the apertures may be substantially uniform across the plate or apertures may be located in a number of specific areas.
  • the apertures may be substantially elliptical, circular, square, rectangular or any combination thereof. Preferably the apertures are all substantially elliptical. Alternatively a first plurality of apertures may have one geometrical configuration and a second plurality of apertures may have another geometrical configuration, further alternatively multiple pluralities may each have a specific geometrical configuration, thereby combining all of the geometrical configurations mentioned above.
  • the sound suppressing plate is made from steel, stainless steel, aluminium, galvanised steel or alternatively made from a ceramic material.
  • the sound suppressing plate may have a thickness of 0,508 mm (0,020") to 5,08 mm (0,2”), such as 1,016 mm (0,040"), such as 2,032 mm (0,080”), such as 3,048 mm (0,120”), preferably 1 mm.
  • the first medium is flue gas or air and the second medium is mainly water and/or steam.
  • the first medium is preferably located in between the tubes and carries the heat from a furnace or the like to the heat exchanger chamber.
  • Other embodiments utilising other fluids may, however, be envisioned.
  • the water may eventually reach a point where the water is evaporated into steam, dependant on the pressure in the tubes.
  • a boiler particularly a boiler for being installed in an ocean going vessel, may comprise a heat exchanger including any of the above mentioned aspects.
  • the boiler according to the teachings of the present invention may be installed in ocean going vessels, such as in freighters, cargo boats, cargo vessels, general ships, tankers or the like.
  • Fig. 1 is a horizontal cross sectional side view of a boiler comprising a heat exchanger according to the present invention, the boiler in its entirety is designated the reference numeral 10.
  • the boiler 10 comprises a burner outlet 12 mounted at the top of the boiler 10.
  • the burner outlet 12 is in fluid communication with the furnace chamber 14 located inside the boiler 10.
  • the burner outlet 12 releases a flame 16 into the furnace chamber 14.
  • the hot gas escapes the furnace chamber 14 via an opening 18 in the side wall 20.
  • the hot flue gas passes from the bottom of the convection chamber 22 along a number of tubes 24.
  • the tubes 24 are fitted with a number of pins having at least two different lengths. In the presently preferred embodiment of the present invention, the lower part of the tubes 24 is fitted with 15 rows of pins having a length of 34 mm.
  • short pins are fitted to the tube for receiving the flue gas directly from the furnace chamber 14 and cools it approximately 150°C. Fitting the tube with long pins in this section may cause the long pins to melt.
  • at least one section comprising longer pins may be included. In the presently preferred embodiment the longer pins have a length of approximately 43 mm.
  • All the pins may be welded onto the tube by resistance welding, such as by resistance butt-welding, resistance flash-welding, resistance percussive-welding, resistance seam-welding, resistance spot-welding alternatively any other welding technique, further alternatively combinations thereof.
  • the pins may be formed integrally with the tube 24 during the forming of the tube or part of the tube. In the presently preferred embodiment of the present invention the pins on the tubes 24 are pulled or pushed through a matrix having a cross section smaller than that of the tube 24 fitted with a number of pins, thereby causing the longer pins to be bent at an angle with respect to the surface of the tube 24.
  • the short pins 26 are not bent, but embodiments where the smaller pins are also bent may be envisioned. Due to tension and other physical phenomena the long pins are bent approximately 5 mm from the surface of the tube 24. The pins may be weakened at a specific location if the pin is to be bent at a different distance from the tube 24.
  • the pins are placed in substantial registration but configurations where a first pin is placed shifted with respect to a second pin placed above or below the first pin may be envisioned.
  • the pins may be placed so that they form a staircase like structure, this configuration is often seen in heat exchangers employing surface enlarging elements having a continuous surface.
  • Boilers, and heat exchangers, including pin tubes have been known to produce unacceptably high levels of noise.
  • This noise has been identified as mainly consisting of single frequency tones in the range 300-700 Hz. Thorough investigations of the noise generating mechanisms responsible for the generation of the tones have been analysed and it has been realised that the tones originate in the convection chamber of the boiler.
  • Periodic fluctuations in the airflow behind the pins on the tubes 24 may induce unsteady pressure fluctuations on the pins themselves, which internally act as an acoustic source. Assuming there is no feedback, these sources can reasonably be approximated as point dipoles having a frequency distribution peaked around a frequency that can be derived from the dimensionless Strouhal number, where the Strouhal number is defined as the peak frequency of the pressure fluctuations multiplied with the diameter of the pins and divided with the free stream mean flow speed.
  • the frequency response of the acoustic forcing in the convection chamber 22 is dependant on the structure of the chamber and assuming there is little or no damping the frequency giving the maximum response to a given forcing is identical to the eigenfrequency of the convection chamber 22. However, when there is significant damping, the frequency giving the maximum response deviates from the real part of the complex eigenfrequency of that mode. This mathematical subtlety has important consequences for the prediction of observed frequencies.
  • Noise may further be reduced by introducing sound absorbing material on the side walls of the convection chamber 22, e.g. Rockwoll, alternatively between the outside of the walls 36, 44, 40 and 42, further alternatively sound absorbing material may be applied or affixed to the outside of the boiler, e.g. on, or alternatively in, the exhaust duct leading out from the boiler.
  • sound absorbing material on the side walls of the convection chamber 22, e.g. Rockwoll, alternatively between the outside of the walls 36, 44, 40 and 42, further alternatively sound absorbing material may be applied or affixed to the outside of the boiler, e.g. on, or alternatively in, the exhaust duct leading out from the boiler.
  • the flue gas After the flue gas has passed the section comprising the short pins 26 and the section comprising the long pins 28, the flue gas is exhausted from the boiler 10 through an exhaust outlet 30.
  • the boiler 10 is further equipped with a water reservoir 32 in fluid communication with the tube connections 24.
  • the hot flue gas transfers heat to the tubes 24 through the surface of the tube 24 and the surface enlarging elements, e.g. the pins on the tubes, and thereby transfers heat to the water or steam inside the tubes 24 collected from the water reservoir 32.
  • the water is heated and evaporates inside the tubes 24 and the steam rises into the steam room 34 where the steam may condens into water again and may be returned to the water reservoir 32 via tubes in the side walls of the furnace chamber 14.
  • the steam is released into a not illustrated system where the steam is utilised for other purposes, such as heating the oil used in the burner 12 and for driving a pump system, also not illustrated here.
  • the water inside the boiler 10 may be replenished from an external source of water.
  • Fig. 2 is a cross-sectional view of the boiler of Fig. 1 along the line A-A.
  • Fig. 2 illustrates the placement of the tubes 24 in the convection chamber 22 constituted by four rows of tubes 36, 38, 40 and 42.
  • the tubes are interconnected with a metal bar welded between neighbouring tubes, thereby creating a wall.
  • the furnace chamber 14 is constituted by a panel wall 44. At the top of the tubes constituting the wall 42 some of the tubes are bent outward for establishing the exhaust outlet 30, also no metal bars are welded to the tubes in this region.
  • Fig. 2 further illustrates the placement if the burner outlet 12 in the furnace chamber 14.
  • a number of stays 46 are employed to support the top and bottom of the steam chamber 34.
  • two sound absorbing elements 50, 52 are shown placed in between the tubes 24.
  • the sound absorbing elements 50, 52 serve, partly, to divide the convection chamber 22 and thereby altering the audio characteristics of the convection chamber 22.
  • the sound absorbing elements 50, 52 are preferably of a type characterised by not causing a loss of pressure.
  • the sound absorbing elements 50, 52 are plates of the material described in EP 0 876 539 B1 .
  • the sound absorbing element employed in the presently preferred embodiment of the present invention are marketed by Sontech Noisecontrol, a company of Sweden, with the product name AcustiMet.
  • Fig. 3 is a zoomed view of the box B illustrating the sound absorbing element 52 and a number of tubes 24 of the boiler of Fig. 1 and 2 .
  • the tubes 24 are placed in a honey-comb like configuration for achieving the highest density of pins and tubes, but other configurations may be envisioned such as square, circular or any other geometrical configuration or combinations hereof.
  • the sound absorbing element 52 is bent so that it may be placed in the narrow space between at least two adjacent pins 28. In the presently preferred embodiment of the present invention, the space between pins varies between 3 to 5 mm. The theoretical spacing between the pins is 6 mm.
  • Fig. 4 is a schematic view along the line C-C of Fig. 3 illustrating the spatial distribution of the pins 28 relative to the flow of the hot gas, illustrated by the arrows R, and the placement of the sound absorbing element 52.
  • Regular duct silencers provide acoustic attenuation with sound absorptive materials behind perforated metal sheets arranged in baffles.
  • the installation of a silencer in the exhaust ducts of the boiler does not remove the source of the noise, but instead absorbs the noise after it is generated.
  • a 1m silencer can give a reduction in the range of approximately 15-30 dB(A), depending on the pressure drop that can be accommodated.
  • the acoustic absorption in the convection chamber could be plates, such as solid plates or perforated plates.
  • the perforated plate works by supporting a pressure difference across it while allowing a flow through the small holes in the plate.
  • the pressure drop is caused by a combination of inertial and viscous forces and leads to a loss of acoustic energy corresponding to the difference in the work done by the pressure on the two sides of the plate. Physically, this energy is converted to heat by viscous actions in the flow through the plate.
  • the first step is to identify a correspondence between the observed frequencies and the frequencies of the eigenmodes of the untreated boiler. This requires measurements of the tonal frequencies from an untreated boiler, as well as a calculation of the eigenfrequencies of the convection chamber of the boiler. Once the modes that are prone to feedback are identified, the optimal arrangement of plates can be determined by calculating the damping in each mode for different arrangements. By appropriately scaling results from the cold test, it is possible to make an educated estimate of an appropriate amount of damping and thus to evaluate whether the chosen arrangement should provide sufficient damping to forestall the feedback mechanism.
  • the acoustic properties of the plate are described by its resistivity, which describes the relationship between the pressure drop across the plate and the flow velocity through it.
  • Resistivity has the same units as acoustic impedance and the optimal resistivity of a plate is equal to the impedance of the air in which it is placed. This is a critical issue that must be addressed when approaching the perforated plate as a solution strategy in a hot boiler, where the temperature varies considerably along the axis of the chamber.
  • the issue of the appropriate resistivity must be addressed in the calculations to determine the optimum plate arrangements.
  • the issue of which hole size delivers the optimum resistivity at a given temperature must also be addressed.
  • An insulating material located on the walls would experience a certain deterioration of the acoustic properties of the material with time, unless regularly and appropriately cleaned.
  • An alternative solution to introducing absorption to the chamber is to divide the chamber up with solid plates in an attempt to create a number of smaller chambers whose cross-sectional modes have frequencies that are greater than the peak excitation frequencies of the maximum flow speeds observed in the boiler.
  • the temperature at the top of the chamber determines the lowest frequency at which a given cross-sectional mode can exist.
  • the temperature at the top of the boiler is approximately 300°C.
  • the frequency of the lowest cross-sectional eigenmode should be greater than 700Hz at a temperature of 300°C
  • the longest length of a sub-chamber should be no more than approximately 30cm. This corresponds to dividing the chamber into triangular sub-chambers each enclosing three pin tubes.
  • the final solution strategy is to address the unsteady flow in an attempt to bring about an excitation that does not lead to an acoustic response that can interact significantly with the flow.
  • the 690 Hz tone was delayed from 21.1 ms-1 to 23.6ms-1 (12%) with a 16-dB reduction in noise level at onset.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP05715136.7A 2004-04-01 2005-03-30 Heat exchanger and boiler comprising the heat exchanger Active EP1735577B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200400527 2004-04-01
PCT/DK2005/000215 WO2005095879A1 (en) 2004-04-01 2005-03-30 Heat exchanger and boiler comprising the heat exchanger

Publications (2)

Publication Number Publication Date
EP1735577A1 EP1735577A1 (en) 2006-12-27
EP1735577B1 true EP1735577B1 (en) 2016-03-16

Family

ID=34962024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05715136.7A Active EP1735577B1 (en) 2004-04-01 2005-03-30 Heat exchanger and boiler comprising the heat exchanger

Country Status (5)

Country Link
EP (1) EP1735577B1 (ko)
KR (2) KR100918552B1 (ko)
CN (1) CN100562703C (ko)
DK (1) DK1735577T3 (ko)
WO (1) WO2005095879A1 (ko)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102092062B1 (ko) 2013-04-30 2020-03-23 인텔렉추얼디스커버리 주식회사 디스플레이어 입력장치 및 입력방법
CN106996552A (zh) * 2017-05-05 2017-08-01 张家港格林沙洲锅炉有限公司 膜式壁单锅筒船用锅炉
KR102408191B1 (ko) * 2020-10-22 2022-06-13 강림중공업 주식회사 보일러

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB737990A (en) * 1949-09-19 1955-10-05 Svenska Maskinverken Ab Improvements in or relating to heat exchangers
GB868203A (en) * 1956-11-12 1961-05-17 Svenska Maskinverken Ab Heat exchangers
SE337597B (ko) * 1970-01-14 1971-08-16 Svenska Maskinverken Ab
SE355663B (ko) * 1971-06-07 1973-04-30 Svenska Maskinverken Ab
GB2081868B (en) * 1980-08-07 1984-04-26 Applegate G Improvements in or relating to heat exchangers and/or silencers
SE8803193L (sv) * 1988-09-12 1990-03-13 Gadelius Sunrod Ab Vaermevaexlartub med ytfoerstorande element
DE3913579A1 (de) * 1989-04-25 1990-10-31 Linde Ag Waermetauscher
JPH06221792A (ja) * 1993-01-29 1994-08-12 Nippon Steel Corp 多管式熱交換器および同熱交換器に配置したバッフル板の取付け構造
DK0658736T3 (da) * 1993-12-14 1997-10-13 Aalborg Ind As Ribberørsvarmeveksler
SE506188C2 (sv) * 1996-01-25 1997-11-17 Dale Edward Knipstein Ljudabsorberande element samt förfarande för framställning av detta element samt användning av elementet
JP3720614B2 (ja) * 1999-02-04 2005-11-30 リンナイ株式会社 熱交換装置

Also Published As

Publication number Publication date
KR100918551B1 (ko) 2009-09-21
KR20070000968A (ko) 2007-01-03
EP1735577A1 (en) 2006-12-27
KR100918552B1 (ko) 2009-09-21
CN100562703C (zh) 2009-11-25
WO2005095879A1 (en) 2005-10-13
KR20080036129A (ko) 2008-04-24
DK1735577T3 (en) 2016-06-06
CN1989387A (zh) 2007-06-27

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