EP0408397B1 - Four de chauffage muni d'une plaque radiante - Google Patents

Four de chauffage muni d'une plaque radiante Download PDF

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Publication number
EP0408397B1
EP0408397B1 EP90307730A EP90307730A EP0408397B1 EP 0408397 B1 EP0408397 B1 EP 0408397B1 EP 90307730 A EP90307730 A EP 90307730A EP 90307730 A EP90307730 A EP 90307730A EP 0408397 B1 EP0408397 B1 EP 0408397B1
Authority
EP
European Patent Office
Prior art keywords
casing
plaque
air
burner
air 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
EP90307730A
Other languages
German (de)
English (en)
Other versions
EP0408397A3 (en
EP0408397A2 (fr
Inventor
David Mervin Jones
John Keith Maund
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.)
ADVENTEC Ltd
Original Assignee
ADVENTEC 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 ADVENTEC Ltd filed Critical ADVENTEC Ltd
Priority to AT90307730T priority Critical patent/ATE104421T1/de
Publication of EP0408397A2 publication Critical patent/EP0408397A2/fr
Publication of EP0408397A3 publication Critical patent/EP0408397A3/en
Application granted granted Critical
Publication of EP0408397B1 publication Critical patent/EP0408397B1/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
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C1/00—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified
    • F24C1/08—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified solely adapted for radiation heating

Definitions

  • This invention relates to a radiant plaque heater of the kind having a burner arranged to heat a plaque element from which radiant heat is emitted into a space to be heated, such as a factory working area.
  • US-A-4524753 discloses a radiant plaque heater in which a plaque element is arranged within the casing so as to be heated by a burner, and air flow means induces a flow of air into the casing creating an over-pressure therein which inhibits air flow from the exterior into the casing adjacent the plaque.
  • An object of the invention is to provide an improved radiant plaque heater of relatively increased efficiency.
  • a radiant plaque heater comprises a casing, a burner, a plaque element arranged within the casing so as to be heated by the burner and produce a radiant heat output, and air flow means operable to induce a flow of air into the casing in order to create an over-pressure therein which inhibits air flow from the exterior into the casing adjacent the plaque, and a heat exchanger arranged to receive burner exhaust gas and said air flow in heat exchange relationship in respective separate flow paths therein, an outlet of the heat exchanger being arranged to introduce heated air emitted therefrom into a location from which the heated air serves to transmit heat to the plaque element to assist in raising the temperature of the latter.
  • the air flow induced into the heater passes through a flow distributor which controls the induced air flow, preferably in a variable manner, and thereby the over-pressure in the casing.
  • the radiant plaque heater illustrated in the drawings includes an outer hollow casing 1 which supports, adjacent to an open end 2 thereof, a radiant plaque element 3 and a burner 4 arranged to direct burning fuel, such as gas, over and/or into the interior of the plaque to heat the latter.
  • the heated plaque radiates heat outwardly through the open end 2 of the casing.
  • the open end of the casing is flared outwardly by the provision of an oblique peripheral surface 2A which acts as a reflector to direct radiant heat from the plaque downwards and thereby minimise sideways heat loss
  • the flared casing portion also forms a space beneath the plaque within which a slight positive air pressure may exist.
  • Air flow means illustrated as a fan 5 is mounted on the casing and, although conveniently shown at the top of the casing, could be disposed at any convenient location.
  • the fan when operating, draws in air and injects this under a small pressure into the interior of the casing 1, the air flow being controlled by means of a flow distributor, illustrated as a perforated plate 6 which may be adjusted to vary the flow rate of the air entering the casing.
  • the casing in this embodiment of the plaque heater contains a heat exchanger, illustrated diagrammatically and in a general manner at 7.
  • the heat exchanger contains a first convoluted flow path, branches of which are illustrated at A and a second convoluted flow path having branches B, the paths A and B being separated in fluid tight manner by partitions 8.
  • An outlet from the path B communicates with an exhaust port 9 of the casing (fig 2) and the flow of exhaust gas through the heat exchanger to the exhaust port is represented by the arrows B in Figure 2.
  • the path A of the heat exchanger communicates with a region 10 adjacent the burner for introduction of gas flow on to the plaque 3, as illustrated by the arrows A in Figure 1.
  • the plaque 3 is heated by the burner 4 and radiates heat through the open end 2 of the casing 2 as mentioned previously.
  • the exhaust gases from the burner, represented by the arrows E rise within the casing into the exhaust flow path B within the heat exchanger.
  • Operation of the fan 5 produces an inflow of air to the casing 1 through the flow control plate 6, which is adjusted to provide the desired air flow.
  • the inflow of air enters the path A of the heat exchanger and, in flowing along this path, extracts heat from the exhaust gases in path B and is thereby heated.
  • the heated air is then introduced at a relatively high temperature into the aforesaid region 10 and assists in raising the temperature of the radiant plaque 3.
  • the action of the fan 5 creates within the housing 1 a slight over-pressure, the magnitude of which can be optimised by adjustment of the plate 6 and/or the fan speed. Because of the flared casing end portion, the aforesaid over-pressure exists beneath the plaque and inhibits any tendency for air to be drawn inwardly through the open end 2 of the casing and thereby substantially prevents the radiant plaque 3 from being contacted by an upward inflow of cool air which would have the effect of cooling the plaque and lessening the efficiency of the heater.
  • the heater of the invention in the form described incorporating a heat exchanger can achieve an efficiency approaching 50% of the energy input, measured as radiant heat output, in comparison with an efficiency of less than 30% obtained in many conventional radiant plaque heaters.
  • the heat exchanger may be demountable, or in the form of an add-on module which may be attached, when required, to an existing radiant plaque heater.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Radiation-Therapy Devices (AREA)
  • Electric Ovens (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (6)

  1. Chauffage à plaque radiante comprenant un boîtier (1), un brûleur (4), un élément en forme de plaque (3) disposé à l'intérieur du boîtier de façon à être chauffé par le brûleur et à émettre une énergie thermique rayonnante, ainsi qu'un moyen d'écoulement d'air (5) qui peut être mis en service pour induire un écoulement d'air dans le boîtier afin de créer une surpression à l'intérieur qui empêche l'écoulement d'air provenant de l'extérieur dans le boîtier en position adjacente à la plaque, caractérisé par un échangeur de chaleur (7) disposé en son sein pour recevoir les gaz d'échappement du brûleur et ledit écoulement d'air dans une relation d'échange de chaleur dans des voies d'écoulement séparées respectives (A, B), une sortie de l'échangeur de chaleur étant arrangée pour introduire de l'air chauffé émis par ce dernier dans un endroit (10) à partir duquel l'air chauffé sert à transmettre de la chaleur à l'élément en forme de plaque (3) pour favoriser l'élévation de la température de ce dernier.
  2. Chauffage selon la revendication 1, caractérisé en ce que l'écoulement d'air induit dans le boîtier (1) passe par un distributeur d'écoulement (6) qui commande l'écoulement d'air induit et ainsi, la surpression régnant dans le boîtier.
  3. Chauffage selon la revendication 2, caractérisé en ce que le distributeur d'écoulement (6) peut être mis en service pour faire varier l'écoulement d'air induit.
  4. Chauffage selon la revendication 2 ou 3, caractérisé en ce qu'un orifice (2) du boîtier, à travers lequel est dirigée l'énergie thermique rayonnante, est muni d'une surface périphérique divergente (2A) qui fait office de déflecteur vers l'intérieur pour la chaleur rayonnante.
  5. Chauffage selon la revendication 1, caractérisé en ce qu'une des voies (B) de l'échangeur de chaleur reçoit des gaz d'échappement provenant du brûleur (4) et comporte une sortie qui communique avec un orifice d'évacuation (9) du boîtier, l'autre voie (A) comportant une entrée pour l'air provenant dudit moyen d'écoulement d'air (5) et une sortie à partir de laquelle l'air chauffé qui s'échappe est dirigé sur ou dans l'élément en forme de plaque (3) pour favoriser l'élévation de température de ce dernier.
  6. Chauffage selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (1) est muni d'un orifice d'évacuation (9) pour évacuer les gaz d'échappement du brûleur.
EP90307730A 1989-07-14 1990-07-16 Four de chauffage muni d'une plaque radiante Expired - Lifetime EP0408397B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90307730T ATE104421T1 (de) 1989-07-14 1990-07-16 Heizofen mit waermestrahlungsplatte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8916237 1989-07-14
GB898916237A GB8916237D0 (en) 1989-07-14 1989-07-14 Radiant plaque heater

Publications (3)

Publication Number Publication Date
EP0408397A2 EP0408397A2 (fr) 1991-01-16
EP0408397A3 EP0408397A3 (en) 1991-06-05
EP0408397B1 true EP0408397B1 (fr) 1994-04-13

Family

ID=10660091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90307730A Expired - Lifetime EP0408397B1 (fr) 1989-07-14 1990-07-16 Four de chauffage muni d'une plaque radiante

Country Status (4)

Country Link
EP (1) EP0408397B1 (fr)
AT (1) ATE104421T1 (fr)
DE (1) DE69008060D1 (fr)
GB (1) GB8916237D0 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9707396D0 (en) 1997-04-11 1997-05-28 Jones Philomena J Heaters

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8112663U1 (de) * 1981-04-29 1982-10-07 Schwank GmbH, 5000 Köln Heizgeraet mit gasbeheizten infrarotstrahlbrennern
US4524753A (en) * 1982-11-12 1985-06-25 Daniel Wolf Infra-red heating apparatus

Also Published As

Publication number Publication date
ATE104421T1 (de) 1994-04-15
EP0408397A3 (en) 1991-06-05
EP0408397A2 (fr) 1991-01-16
DE69008060D1 (de) 1994-05-19
GB8916237D0 (en) 1989-08-31

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