EP0225929A1 - Installation et utilisation de chaudières chauffées par gaz - Google Patents

Installation et utilisation de chaudières chauffées par gaz Download PDF

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Publication number
EP0225929A1
EP0225929A1 EP85115685A EP85115685A EP0225929A1 EP 0225929 A1 EP0225929 A1 EP 0225929A1 EP 85115685 A EP85115685 A EP 85115685A EP 85115685 A EP85115685 A EP 85115685A EP 0225929 A1 EP0225929 A1 EP 0225929A1
Authority
EP
European Patent Office
Prior art keywords
boiler system
heat exchanger
ribs
burner bed
heat
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
EP85115685A
Other languages
German (de)
English (en)
Other versions
EP0225929B1 (fr
Inventor
Bassols J. Rheinfelder
N. Bednarek
J. Marijnen
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.)
Rendamax BV
Original Assignee
Rendamax AG
Rendamax 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8193928&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0225929(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Rendamax AG, Rendamax BV filed Critical Rendamax AG
Priority to EP85115685A priority Critical patent/EP0225929B1/fr
Priority to DE8585115685T priority patent/DE3576193D1/de
Priority to US06/936,884 priority patent/US4721068A/en
Priority to CA000524514A priority patent/CA1262221A/fr
Priority to KR860010413A priority patent/KR870006368A/ko
Publication of EP0225929A1 publication Critical patent/EP0225929A1/fr
Application granted granted Critical
Publication of EP0225929B1 publication Critical patent/EP0225929B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • 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
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0026—Guiding means in combustion gas channels
    • 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
    • F28F1/36—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 the means being helically wound fins or wire spirals

Definitions

  • the invention relates to a gas-fired boiler system with a burner bed which takes up a surface and with heat exchange tubes arranged above the burner bed parallel to the surface, the heat exchange tubes having pipes which have a plurality of essentially radially projecting, flat, mutually over the length of the heat exchange tubes are provided with spaced ribs, which have bevels at their edges and furthermore the hot flue gas rising from the burner bed flows through the spaces formed by the ribs and the pipelines.
  • Convective heat transfer is understood to mean the transfer of heat from the hot air rising from the burner bed to the surfaces of a heat exchanger, while the radiant heat is exploited by the fact that the heat radiation emitted by the burner bed and the hot flue gas is essentially in the infrared range on surfaces of the heat exchanger is absorbed.
  • finned tubes have been used as heat exchange tubes in heat exchangers, known from DE-C-22 45 357 mentioned at the beginning.
  • These finned tubes consist of a straight pipeline through which a heat exchange medium, for example water, flows, from which radially circular flat ribs project, which are arranged spirally around the pipeline and extruded from it.
  • the pipeline and fins are preferably made of a copper / beryllium alloy with particularly good thermal conductivity.
  • These known finned tubes have a very large heat transfer surface and are therefore particularly suitable as convective heat exchangers.
  • the deflection plates can only rest on the narrow edges of the ribs, so that there is only a poor heat transfer between the deflection plates and the ribs, which in turn leads to the above-described emission of the radiant heat collected to those that have already cooled Flue gases are conveyed because the baffles cannot or only very poorly transfer their heat to the ribs due to the poor heat transfer.
  • the invention is therefore based on the object of developing a gas-fired boiler system of the type mentioned in such a way that an even greater yield of radiant heat is possible while at the same time improving the convective heat transfer in order to be able to implement boiler systems with even higher efficiency.
  • bends are at least partially inclined to the surface of the burner bed.
  • the bevels now arranged obliquely in the flow path of the rising hot flue gases result in a considerably enlarged area being available for absorbing the radiant heat, which is rigid, i.e. is connected to the heat exchange tubes with optimal heat transfer.
  • the oblique bevels arranged in the flow path of the rising smoke gases cause the rising smoke gases to be swirled considerably more, so that the convective heat transfer to the fins of the heat exchange tube is also considerably increased.
  • the gas-fired boiler system according to the invention has a significantly higher efficiency than is possible according to the prior art.
  • This aspect is of particular importance for modulating gas-fired boiler systems, in which the burner output is continuously and variably set depending on the respective heat requirement, in contrast to so-called on / off burners, which either run at full power or are switched off. If a modulating boiler system is operated at a low output, it is of particular importance to remove the heat generated by the burner bed as useful as possible.
  • the gas-fired boiler system according to the invention can be equipped with only one heat exchanger and also with an additional condensation heat exchanger as a condensing boiler.
  • the bends to the surface of the burner bed run at an angle of approximately 45 °.
  • this angle has proven to be particularly advantageous because in this case, on the one hand, a relatively large receiving area is available for absorbing the radiant heat, and on the other hand, the rising smoke gases are optimally swirled with bends angled at 45 °.
  • the heat exchange tubes are arranged as heat exchangers, closely parallel next to one another, with the invention that the ribs on the side of the heat exchanger facing the burner bed are provided in sections with the inclined folds.
  • the folds can also be arranged on the side of the heat exchanger which faces away from the burner bed, this measure being particularly suitable for being used together with the measure mentioned above, so that the heat exchanger then has a total of folds is provided on both sides.
  • the ribs are provided with bends over part of their circumference.
  • This measure has the advantage that, as already explained, the radiant heat can be collected at the folded area, on the other hand the non-bent area of the ribs can be arranged in any way as inputs or outputs from the heat exchanger.
  • an exemplary embodiment of the invention is particularly preferred in which the ribs are designed in the form of an annular disk in a manner known per se and the bevels are formed by bending edge regions of the ribs in the form of circular sections.
  • This measure has the advantage that conventional heat exchange tubes, which are designed as finned tubes, can be processed with known devices in order to produce the bent sections in the form of a circle.
  • an exemplary embodiment has proven to be particularly important in practice, in which the ribs are divided over their circumference into eight sections of approximately the same size, which with the exception of two diametrically opposite sections are provided with the folds. This applies in particular if the sections that are not folded lower when the heat exchanger is installed stand right one above the other on the surface of the burner bed and form openings for the entry and exit of the smoke gases rising from the burner bed into and out of the intermediate spaces.
  • an embodiment of the invention is preferred in which, on the side of the heat exchanger facing away from the burner bed, inclined bends of adjacent heat exchanger tubes are connected to one another via axially extending baffle plates, as is known per se, but in addition there is the fact that the baffle plates rest on the folds.
  • the baffle plates if the bends run at 45 °, be designed as a V-profile with an internal angle of 90 °.
  • the boiler system is designed as a condensing boiler, the flue gases rising from the burner bed first passing through the heat exchange tubes provided with the oblique bends and then being fed to a further heat exchanger designed as a condensation heat exchanger.
  • the boiler system can be operated in a modulating manner.
  • the two last-mentioned measures each have, alone or in combination, the advantage described at the outset of the greatest possible optimization of the efficiency of the entire boiler system.
  • Fig. 1 designates a gas-fired boiler system as used for buildings of all kinds can be.
  • the boiler system 1 is provided with an air inlet 2, which reaches the area of a burner bed 10, which is composed of several burner rods 3.
  • a regulated gas supply not shown in FIG. 1, creates a flame bed above the burner bed 10, with possibly also regulated air inlet 2, so that hot air rises and reaches the area of a heat exchanger 60 there.
  • the heat exchanger 60 has boiler water connections 4 for introducing or discharging the boiler water provided for the heating purposes.
  • a flue gas 6 which has flowed through the heat exchanger 60 can escape to the outside via a trigger 5.
  • the heat exchanger 60 consists of a multiplicity of heat exchange tubes 61, which can be partially covered by baffle plates 80, as will be explained in more detail below with reference to FIGS. 4 and 5.
  • the boiler system 1 according to FIG. 1 can also have a plurality of heat exchangers arranged one above the other, the first heat exchanger usually absorbing the radiant heat emanating from the burner bed 10 and, by convective heat transfer, also largely dissipating the heat contained in the rising flue gases and a second, downstream heat exchanger as a condensation heat exchanger cools the flue gas 6 further by condensing the moisture contained therein and thus absorbs the heat of evaporation of this moisture.
  • the cooling water first flows through the condensation heat exchanger and then through the heat exchanger 60 shown in detail in FIG. 1.
  • FIG. 2 shows a side view and FIG. 3 shows a top view of a heat exchanger 11 according to the prior art above the burner bed 10.
  • the heat exchanger 11 consists of a plurality of heat exchange tubes 15, 16 arranged in parallel next to one another, only two of which are shown completely in FIGS. 2 and 3.
  • the heat exchange tubes 15, 16 consist of a central pipeline 17, 18, from which radially circular ribs 19, 19a ... and 20, 20a ... respectively.
  • the ribs 19 and 20 run spirally around the pipelines 17, 18 and are preferably extruded therefrom.
  • the pipes 17, 18 and the fins 19, 20 consist of a good heat-conducting material, preferably a copper / beryllium alloy.
  • the pipelines 17, 18 are flowed through by water 21 of a building heating system.
  • the ribs 19, 19a ... and 20, 20a ... are laterally provided with bevels 23 and 24, respectively, in such a way that out of the circular disc-shaped surface of the ribs 19 and 20 edge-section-shaped edge regions are angled by 90 °.
  • the bevels 23, 24 are perpendicular to the surface of the burner bed 10. This, as can clearly be seen in FIG. 2, achieves that the heat exchange tubes 15, 16 can be arranged closely next to one another, but between the bevels 23, 24 of adjacent heat exchange tubes 15 , 16 still has a distance 26 of, for example, one millimeter.
  • the heat exchange tubes 15, 16 are each covered in pairs with baffle plates 30, which cover the space between adjacent heat exchange tubes 15, 16. For the sake of clarity, only one deflection plate, partially broken off, is shown in FIG. 3.
  • flue gases 40 rise upwards and flow along a 41, essentially straight path indicated to slot-shaped openings 42 laterally delimited by the deflection plates 30 and then again out of the heat exchanger 11. as indicated by arrows 43.
  • the flue gases 40 flow through spaces 44, 44a ..., which are delimited by the ribs 19, 19 a ..., the pipeline 17 and the bevels 23.
  • baffle plates 30, seen from the burner bed 10 cover that "window" 48 between the pipes 17, 18, so that the baffle plates 30 absorb at least partially the radiant heat emanating from the burner bed 10 and the ascending smoke gases 40, but can be seen from FIG. 2 clearly that the interface 49 between the baffle plates 30 and the ribs 19, 19a ... or 20, 20a ... represents poor heat transfer because the ribs 19, 19a ... or 20, 20a ... only each abut the baffle plates 30 with their narrow side.
  • FIGS. 4 and 5 show a heat exchanger 60, as already mentioned in FIG. 1, and how it is used for the present invention.
  • the heat exchanger 60 in turn consists of parallel to each other arranged heat exchange tubes 61, 62, which are provided with pipes 63, 64 with radially projecting ribs 65, 65a ... and 66, 66a ... respectively.
  • heat exchange tubes used as semi-finished products in the exemplary embodiment according to FIGS. 4 and 5 correspond to those according to the prior art according to FIGS. 2 and 3, they are designed differently for use in the boiler system according to the invention.
  • the ribs 65 and 66 are divided on their circumference into eight circumferential regions of approximately the same length, of which, apart from two diametrically opposite regions, the other six regions with bevels 70, 71, 72, 73 , 74, 75 are provided. Due to this roughly octagonal configuration, mutually adjacent bevels, e.g. 70, 72 with each other an angle 76 of 135 °.
  • the non-folded areas are in the installed state of the heat exchanger 60 one above the other and vertically above the burner bed 10, so that in this installed state four of the six bends, namely the bends 70, 71, 74 and 75 at an angle 77 of 45 ° to Surface of the burner bed 10 run.
  • baffles 80 resting on two adjacent heat exchange tubes 61, 62 are formed on the upper side of the heat exchanger 60 as V-profiles with an internal angle of 90 °.
  • the upward seal is particularly good because the baffle plates 80 further reduce the openings 86 to an even narrower slot.
  • the heat transfer between the baffle plates 80 and the ribs 65 and 66 is particularly good because the baffle plates 80 do not rest flat on the folds 71 and 74 on the narrow sides of the ribs 65 and 66, but rather.
  • the heat exchanger according to FIGS. 4 and 5 is clearly superior to that of FIGS. 2 and 3, because, as mentioned, the flue gases 82 are swirled on a multiple-angled path in almost closed spaces 84, 84a , so that the flue gases 82 can emit their heat almost completely to the surrounding surfaces or bends 70 to 75 of the ribs 65 or 66.
  • the utilization of the radiant heat is also significantly improved because the burner bed 10 has a receiving surface formed by the bevels 70 and 75 on a width 90, which makes up almost two thirds of the surface of the heat exchanger 60 compared to the burner bed 10.
  • ribs instead of circular disc-shaped ribs, square or rectangular ribs can also be used, a different polygon can be used instead of the octagonal shape of the folds, and the openings for the inlet and outlet of the flue gases can also be arranged off-center or offset, without this leaves the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Details Of Fluid Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP85115685A 1985-12-10 1985-12-10 Installation et utilisation de chaudières chauffées par gaz Expired - Lifetime EP0225929B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP85115685A EP0225929B1 (fr) 1985-12-10 1985-12-10 Installation et utilisation de chaudières chauffées par gaz
DE8585115685T DE3576193D1 (de) 1985-12-10 1985-12-10 Gasbeheizte kesselanlage und verwendung davon.
US06/936,884 US4721068A (en) 1985-12-10 1986-12-02 Gas-fired boiler plant
CA000524514A CA1262221A (fr) 1985-12-10 1986-12-04 Bloc chaudiere fonctionnant au gaz
KR860010413A KR870006368A (ko) 1985-12-10 1986-12-05 가스 보일러

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85115685A EP0225929B1 (fr) 1985-12-10 1985-12-10 Installation et utilisation de chaudières chauffées par gaz

Publications (2)

Publication Number Publication Date
EP0225929A1 true EP0225929A1 (fr) 1987-06-24
EP0225929B1 EP0225929B1 (fr) 1990-02-28

Family

ID=8193928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115685A Expired - Lifetime EP0225929B1 (fr) 1985-12-10 1985-12-10 Installation et utilisation de chaudières chauffées par gaz

Country Status (5)

Country Link
US (1) US4721068A (fr)
EP (1) EP0225929B1 (fr)
KR (1) KR870006368A (fr)
CA (1) CA1262221A (fr)
DE (1) DE3576193D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315577A2 (fr) * 1987-11-03 1989-05-10 Joh. Vaillant GmbH u. Co. Appareil à brûleur en particulier réchauffeur d'eau
EP0790460A2 (fr) * 1996-02-16 1997-08-20 ABB Combustion Engineering S.p.A. Chaudière de récupération avec des tubes à ailettes
US6431856B1 (en) * 1995-12-14 2002-08-13 Matsushita Electric Industrial Co., Ltd. Catalytic combustion apparatus
EP4038323A4 (fr) * 2019-10-04 2023-10-25 Rheem Manufacturing Company Tubes d'échangeur de chaleur et configurations d'assemblage de tubes

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5163508A (en) * 1991-12-16 1992-11-17 Teledyne Industries, Inc. Heat exchanger baffle system
US6526898B1 (en) * 2001-12-03 2003-03-04 Technology Sales & Marketing Corporation Furnace with radiant reflectors
KR20030090911A (ko) * 2002-05-23 2003-12-01 주식회사 경동보일러 콘덴싱 가스보일러
US7650933B2 (en) * 2005-03-14 2010-01-26 Allied Engineering Company, Division Of E-Z-Rect Manufacturing Ltd. Baffle for sealed combustion chamber
DE102006017432B4 (de) * 2006-04-06 2009-05-28 Visteon Global Technologies Inc., Van Buren Innerer Wärmeübertrager mit kalibriertem wendelförmigen Rippenrohr
US9109844B2 (en) * 2012-03-01 2015-08-18 Rheem Manufacturing Company Nested helical fin tube coil and associated manufacturing methods
US10458677B2 (en) * 2015-12-11 2019-10-29 Lochinvar, Llc Heat exchanger with dual concentric tube rings

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR667479A (fr) * 1928-01-18 1929-10-17 Perfectionnements aux échangeurs de chaleur
FR2470947A1 (en) * 1979-12-06 1981-06-12 Edine Jean Claude Heat exchanger for boiler - has circular finned tube placed inside square section tube with fluid circulation between
DE2245357C2 (de) * 1971-09-21 1983-02-03 Rendamax Produkten B.V., Kerkrade-West Wärmetauscher mit einer Anzahl parallel nebeneinander angeordneter Rohre mit wendelförmigen Rippen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578136A (en) * 1946-05-24 1951-12-11 Huet Andre Tangentially finned heat exchange tubes
US3800748A (en) * 1973-01-08 1974-04-02 Mms Ltd Fluid heater appliance
US4501232A (en) * 1983-10-03 1985-02-26 Purex Pool Products, Inc. Pool or spa water heater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR667479A (fr) * 1928-01-18 1929-10-17 Perfectionnements aux échangeurs de chaleur
DE2245357C2 (de) * 1971-09-21 1983-02-03 Rendamax Produkten B.V., Kerkrade-West Wärmetauscher mit einer Anzahl parallel nebeneinander angeordneter Rohre mit wendelförmigen Rippen
FR2470947A1 (en) * 1979-12-06 1981-06-12 Edine Jean Claude Heat exchanger for boiler - has circular finned tube placed inside square section tube with fluid circulation between

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KLIMAAT BEHEERSING, Band 13, Nr. 2, Februar 1984, Seiten 94-97, Zeist, NL; A. VAN DEN DOOL "Saarloos bv, Rendamax HR-ketel voor centrale verwarming met extreem hoog gebruiksrendement" *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315577A2 (fr) * 1987-11-03 1989-05-10 Joh. Vaillant GmbH u. Co. Appareil à brûleur en particulier réchauffeur d'eau
EP0315577A3 (en) * 1987-11-03 1989-08-23 Joh. Vaillant Gmbh U. Co. Burner heated apparatus, especiallly water heater
US6431856B1 (en) * 1995-12-14 2002-08-13 Matsushita Electric Industrial Co., Ltd. Catalytic combustion apparatus
EP0790460A2 (fr) * 1996-02-16 1997-08-20 ABB Combustion Engineering S.p.A. Chaudière de récupération avec des tubes à ailettes
EP0790460A3 (fr) * 1996-02-16 2000-03-08 ABB Combustion Engineering S.p.A. Chaudière de récupération avec des tubes à ailettes
EP4038323A4 (fr) * 2019-10-04 2023-10-25 Rheem Manufacturing Company Tubes d'échangeur de chaleur et configurations d'assemblage de tubes

Also Published As

Publication number Publication date
KR870006368A (ko) 1987-07-10
CA1262221A (fr) 1989-10-10
US4721068A (en) 1988-01-26
EP0225929B1 (fr) 1990-02-28
DE3576193D1 (de) 1990-04-05

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