EP0606782B1 - Dispositif de chauffage pour locaux - Google Patents

Dispositif de chauffage pour locaux Download PDF

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Publication number
EP0606782B1
EP0606782B1 EP93310648A EP93310648A EP0606782B1 EP 0606782 B1 EP0606782 B1 EP 0606782B1 EP 93310648 A EP93310648 A EP 93310648A EP 93310648 A EP93310648 A EP 93310648A EP 0606782 B1 EP0606782 B1 EP 0606782B1
Authority
EP
European Patent Office
Prior art keywords
head
duct
burner
appliance
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93310648A
Other languages
German (de)
English (en)
Other versions
EP0606782A1 (fr
Inventor
Simon Dunne
John Arnold
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.)
Nortek Global HVAC UK Ltd
Original Assignee
Ambi Rad Ltd
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 Ambi Rad Ltd filed Critical Ambi Rad Ltd
Publication of EP0606782A1 publication Critical patent/EP0606782A1/fr
Application granted granted Critical
Publication of EP0606782B1 publication Critical patent/EP0606782B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
    • F23D14/586—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits formed by a set of sheets, strips, ribbons or the like
    • 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
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
    • F24D5/06—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated
    • F24D5/08—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated with hot air led through radiators

Definitions

  • This invention relates to radiant tube space heating appliances of the kind comprising a radiation tube or duct, commonly suspended overhead in the space to be heated, a fan or other pump for inducing flow of gases along the duct in use. and one or more fluid fuelled burner assemblies, typically gas fired and automatically controlled, for feeding hot gases into said flow. Radiant heat is emitted from the duct surface and this is commonly directed and concentrated, e.g. in a downward direction, by reflectors mounted adjacent to the duct. Said appliances are hereinafter referred to as "radiant tube heating appliances”.
  • the object of the invention is to provide a radiant tube heating appliance which is reliable and efficient in operation, and which gives improved performance and output.
  • the arrangement of the invention has the effect of concentrating the flow of mix issuing from the mouth in use towards the distal end of the slot remote from the mixing unit so that more combustion takes place adjacent to a circumferential zone of the duct wall at the side opposite to said mixing unit to increase radiant heat output from that zone which will be operatively mounted to face e.g. downwardly or otherwise towards the parts of the space where most heat is required.
  • said burner mouth will include a honeycomb or other matrix, e.g. formed from corrugated or other strip stainless steel or other metal, to prevent burning back into the head and smooth and further direct the outflow of mix therefrom.
  • a honeycomb or other matrix e.g. formed from corrugated or other strip stainless steel or other metal
  • the mixing unit includes connections for feeding gas fuel and combustion air to the fuel mix passage of the head which are positioned at or towards the rear and upstream facing wall thereof so that the inflows into the head for mixing therein are further concentrated in the direction of said distal end of the slot.
  • the proportions of the slot forming the burner mouth will have a major dimension: minor dimension ratio of at least 2.8:1.
  • the heating appliance may include a plurality of said burner assemblies spaced at intervals along a common radiation duct.
  • Said assemblies may be disposed in series along a single duct length or may act in parallel in limbs of a branched duct and they may all be controlled in common or may have a degree of independent control dependent on requirements for the particular installation.
  • the radiant tube space heating appliance of this example is an installation for heating a large space such as a factory building or public hall; the overall installation is generally conventional comprising branched runs of radiation duct being circular section tube 10 mounted overhead, e.g. near roof or ceiling level and provided with reflectors 12 for directing and concentrating the emitted radiant heat downwards in known manner.
  • Hot gases provided by burner assemblies 14 at spaced intervals along each branch are drawn through the tube 10 by a common exhaust fan 16 leading to a discharge flue 18.
  • Fan 16 is automatically controlled in known manner to maintain negative pressure in the system of tube 10 i.e. a degree of depression below the ambient atmosphere pressure and the gas flow in the various branches may be further regulated and balanced by manual or automatic dampers (not shown) in known manner.
  • burner assemblies 14 will now be described in greater detail with reference to Figures 1-3. It comprises a fuel/air infeed and control unit 20 mounted externally on the upper periphery of tube 10 and a burner head 22 which projects downwardly into the tube as described in greater detail below.
  • Unit 20 includes a box 24 defining an air chamber 26 which also serves as a protective enclosure for components of the unit, air being drawn into box 24 through a baffled air inlet 28 at one end.
  • An air filter may also be provided.
  • burner head 22 projects through a mounting plate 30 forming part of the floor of box 24 and which is secured to a flanged opening in the top of tube 10.
  • the top of head 22 defines an air infeed opening 32 communicating directly with chamber 26 and which is off-centre, being positioned nearer to the rear wall 34 of head 22 than to its front wall 36 so that the air inflow is concentrated towards said rear wall.
  • a gas fuel nozzle 38 also opens into the upper part of head 22 through the top of rear wall 34 and is connected to a gas fuel feed pipe 40 through a safety cut-off valve 42 and a gas pressure governor 44.
  • the hollow interior of burner head 22 constitutes a fuel mix passage 46, the air and gas fuel inputs being proportioned so that a combustible mix is produced.
  • the lower part of head 22 within tube 10 projects into the path of flow of gases induced along tube 10 from right to left as viewed in Figure 1 and the lower part of front wall 36 defines a rectangular burner mouth 48 on a diametral plane of tube 10 and angled to face downstream of the path of flow along tube 10.
  • Mouth 48 is in the form of an elongated slot as best seen in the elevation of Figure 2, its height, i.e. extent lengthwise of front wall 36 being considerably greater than its width. Mouth 48 is centered in tube 10, and in this example its height is around two thirds of the tube diameter. The ratio of height to width of the mouth is preferably at least 2.8:1.
  • the overall width of head 22 is only slightly greater than the width of mouth 48 but the depth between the front wall 36 and rear wall 34 is substantially greater.
  • To provide streamlining rear wall 34 has only a short vertical section depending from plate 30 and is then angled to slope downwards at about 45 degrees towards the bottom of mouth 48.
  • Said rear wall is also V shaped in horizontal section as shown in Figure 3 so that its exterior faces form an acute angle pointing upstream of the throughflow.
  • Plate 30 also mounts a conventional electrical ignition device 52 for initiating combustion of the mix on start-up and a conventional flame sensing electrode 54 acting in conjunction with cut-off valve 42 to terminate the gas fuel supply in case of flame failure, these controls being associated with an electrical module 56 of the burner assembly in known manner.
  • the burner head will operate at a negative pressure of at least 2 mba within its mix passage 46 and all the air required for combustion of the gas fuel is pre-mixed in said passage prior to discharge from mouth 48.
  • the use of the honeycomb matrix 50 in the mouth also provides improvements in efficiency and performance in comparison with the multi-port ceramic burner mouth inserts used in some known appliances.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gas Burners (AREA)
  • Baking, Grill, Roasting (AREA)
  • Cookers (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Claims (9)

  1. Dispositif de chauffage à tube radiant comprenant un conduit de rayonnement (10), un ventilateur ou autre pompe (16) pour induire un écoulement de gaz le long du conduit, et au moins un ensemble de brûleur (14) comportant une tête de brûleur (22) s'étendant depuis une unité de commande et de mélange de combustible (20) de l'ensemble pour faire saillie latéralement vers l'intérieur du conduit de rayonnement (10) sur le trajet de l'écoulement qui le traverse et déterminant un passage de mélange de combustible (46) menant à un bec de brûleur (48) déterminé par une paroi avant (36) de la tête angulée pour regarder vers l'aval du dit trajet d'écoulement, de sorte que le mélange est déchargé activement le long du dit écoulement pour subir une combustion dans le conduit immédiatement en aval de la tête ; caractérisé en ce que le bec de brûleur est constitué par une fente allongée unique, dont la surface ne comporte aucun obstacle substantiel à l'écoulement de sortie du mélange à travers le bec, ayant sa grande dimension suivant l'axe longitudinal de la tête dans la direction où celle-ci fait saillie à l'intérieur du conduit, et sa petite dimension dans la direction de la largeur de la tête vue dans un plan normal à l'axe du trajet d'écoulement ; et en ce que la largeur totale de la tête à l'intérieur du conduit est légèrement supérieure à la dite petite dimension de la fente de façon à minimiser l'obstacle à l'écoulement dans le conduit au-delà de la tête.
  2. Dispositif selon la revendication 1, caractérisé en ce que le bec de brûleur (48) loge à l'intérieur de la fente un nid d'abeilles ou une autre matrice (50), formé d'une bande de métal ondulée ou autre disposée latéralement à la direction d'écoulement de sortie à travers la fente pour empêcher un retour de combustion dans la tête et pour adoucir et diriger l'écoulement de sortie hors de la fente.
  3. Dispositif selon la revendication 2, caractérisé en ce que le conduit présente une section transversale circulaire et en ce que la dite grande dimension de la fente est environ deux tiers du diamètre du conduit.
  4. Dispositif selon la revendication 1, 2 ou 3, caractérisé en ce que la dite fente présente un rapport d'au moins 2,8 :1 entre sa grande dimension et sa petite dimension.
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une majeure partie de la paroi arrière (34) de la tête (22) fait un angle pour converger vers le bord du bec de brûleur (48) éloigné de la dite unité (20).
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la paroi arrière (34) de la tête (22) présente une section en forme de V de façon que ses faces extérieures forment un angle aigu dont la pointe est vers l'amont du dit trajet d'écoulement.
  7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une ouverture d'alimentation en air (32) de la tête de brûleur (22) s'ouvre directement à partir d'une chambre d'air (26) de la dite unité en une position plus proche de la paroi arrière (34) de la tête que de sa paroi avant (36) pour concentrer l'écoulement d'entrée d'air vers la dite paroi arrière.
  8. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le tube radiant ou conduit (10) est, pour son fonctionnement, suspendu ou placé en l'air dans le local à chauffer, caractérisé en ce que l'ensemble de brûleur (14) est monté de façon que la tête de brûleur (22) soit orientée vers le bas à partir de la dite unité (20) pour faire saillie vers la partie inférieure de la paroi du conduit afin, en fonctionnement, de concentrer la sortie de chaleur radiante depuis la zone inférieure du conduit.
  9. Dispositif de chauffage selon l'une quelconque des revendications précédentes, caractérisé en ce que plusieurs dits ensembles de brûleur (14) sont, en fonctionnement, espacés selon des intervalles le long d'un tube de rayonnement ou conduit (10) à ramifications ou autre, pour agir selon une disposition en série ou en parallèle à l'intérieur de celui-ci.
EP93310648A 1993-01-14 1993-12-31 Dispositif de chauffage pour locaux Expired - Lifetime EP0606782B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9300612 1993-01-14
GB9300612A GB2274703B (en) 1993-01-14 1993-01-14 Space heating appliances

Publications (2)

Publication Number Publication Date
EP0606782A1 EP0606782A1 (fr) 1994-07-20
EP0606782B1 true EP0606782B1 (fr) 1999-06-30

Family

ID=10728674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93310648A Expired - Lifetime EP0606782B1 (fr) 1993-01-14 1993-12-31 Dispositif de chauffage pour locaux

Country Status (4)

Country Link
EP (1) EP0606782B1 (fr)
AT (1) ATE181766T1 (fr)
DE (1) DE69325502T2 (fr)
GB (1) GB2274703B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3460441B2 (ja) * 1996-04-09 2003-10-27 トヨタ自動車株式会社 燃焼装置および該燃焼装置を具備した熱設備
US5842854A (en) * 1996-04-18 1998-12-01 Willms; Eric Infrared heating system and metering element
GB2331146B (en) 1997-11-06 2001-10-17 Ambi Rad Ltd Space heating appliances
AU8146598A (en) 1997-11-26 1999-06-15 Roberts-Gordon Llc Gas fired infrared radiant tube heating system using plural burner assemblies and single gas delivery system
DE102006049875A1 (de) * 2006-10-23 2008-04-24 Robert Bosch Gmbh Gemischbildungseinrichtung
DE102011050143A1 (de) 2011-05-05 2012-11-08 Waldemar Marinitsch Kraftsensor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2070227B (en) * 1980-02-15 1983-07-13 Roberts Appliance Corp Gordon Radiant heating system having an improved burner head
GB2102555B (en) * 1981-07-17 1985-03-20 Phoenix Burners A heating system
EP0248629B1 (fr) * 1986-06-04 1992-08-12 Ambi-Rad Limited Appareil de chauffage des locaux
NL8900900A (nl) * 1989-04-11 1990-11-01 Hoaf Ray O Therm B V Infrarood-verwarmingssysteem.
GB2236406B (en) * 1989-09-12 1993-08-18 Radiant Systems Technology Ltd Radiant heating systems

Also Published As

Publication number Publication date
GB9300612D0 (en) 1993-03-03
ATE181766T1 (de) 1999-07-15
GB2274703B (en) 1996-06-26
DE69325502T2 (de) 2000-01-20
GB2274703A (en) 1994-08-03
EP0606782A1 (fr) 1994-07-20
DE69325502D1 (de) 1999-08-05

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