EP0408396A2 - Installation pour commander le courant d'un fluide - Google Patents

Installation pour commander le courant d'un fluide Download PDF

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Publication number
EP0408396A2
EP0408396A2 EP90307728A EP90307728A EP0408396A2 EP 0408396 A2 EP0408396 A2 EP 0408396A2 EP 90307728 A EP90307728 A EP 90307728A EP 90307728 A EP90307728 A EP 90307728A EP 0408396 A2 EP0408396 A2 EP 0408396A2
Authority
EP
European Patent Office
Prior art keywords
tube
air
duct
space heater
heater according
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
EP90307728A
Other languages
German (de)
English (en)
Other versions
EP0408396B1 (fr
EP0408396A3 (en
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 AT90307728T priority Critical patent/ATE104043T1/de
Publication of EP0408396A2 publication Critical patent/EP0408396A2/fr
Publication of EP0408396A3 publication Critical patent/EP0408396A3/en
Application granted granted Critical
Publication of EP0408396B1 publication Critical patent/EP0408396B1/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
    • 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

  • the present invention relates to a space heater, particularly of the type useful for heating large spaces, such as factory interiors.
  • Radiant heaters can be of simple construction but need to be suspended at a predetermined height above the location to be heated in order to provide the required heating effect. They are also relatively inefficient, since only a minor proportion of the heat is radiated to the desired location. Air heaters are potentially more controllable, but the propensity of hot air to rise can lead to an excessive amount of the available heated air accumulating in a region above the heater.
  • a space heater comprising an elongate combustion tube; a burner device for supplying a combustible mixture into an inlet of the tube adjacent one end thereof; means for urging the combustible mixture and its combustion products to flow through the tube; and air conduit means for receiving heated gas from an outlet of the tube remote from said inlet and distributing it for heating purposes, said air conduit means including an air duct extending longitudinally of and adjacent the tube in heat flow communication with a first region of the tube and wherein the tube is arranged so that in use it emits radiant heat over at least a portion of its length from a radiation region circumferentially spaced from said first region.
  • the air conduit means comprises, in addition to said air duct, a distribution duct having outlets along its length for distributing heated air.
  • Preferably means are provided to vary the proportion of air flowing respectively through the air and distribution ducts.
  • the combustion tube comprises two parallel elongate tube portions communicating at one pair of their ends by way of a joint element, the other ends providing said inlet and outlet.
  • the distribution duct may then extend generally centrally of the tube portions, whereas the air duct may extend generally above each tube portion.
  • the tube portions can radiate heat downwardly, whereas heat which passes upwardly and would otherwise be lost is used to warm the air in the duct above.
  • the heater 10 employs a burner tube 12 which is generally U-shaped, having a pair of long parallel straight arm portions 14 connected together at one end by a curved portion 16 forming a bend.
  • the tube 12 which is desirably of superhelix spirally wound construction, may have a total length of about 10 metres for example, and two arm portions 14 each having a length of 4.7 metres with the length of the bend at about 40 cm.
  • the tube outside diameter is typically 10 cm, but it will be understood that the aforesaid typical dimensions can be varied according to the desired output and other operational requirements.
  • the tube 12 extends within a housing, within which it is suitably suspended on chains 18 which accommodate normal thermal expansion and contraction during operation of the heater.
  • the housing has an outer casing 20 of aluminium or mild steel for example, in the form of an inverted trough with a base 22, angled side portions 24, and downwardly extending lower wall portions 26 which extend beneath the rest of the assembly to serve as low level reflectors.
  • the lower wall portions have spaced apertures to receive bolts or similar fasteners securing associated external fixtures 28 to said portions.
  • An inner casing 30, conveniently of aluminium or mild steel, extends within the outer casing, slightly spaced from the base 22 and angled side walls 24 thereof, except in a central region where it defines a downwardly extending channel 32.
  • the inner casing 30 extends to the outer casing 20 and is connected to it, suitably by riveting at 30A.
  • the central channel 32 is closed at the top by a plate 34, in order to form a longitudinally extending central distribution duct 36 which has openings 38 in its underside at intervals along its length.
  • the space between the outer and inner casings (apart from the duct 36) is filled with insulating material 37 such as compressed fibreglass.
  • each arm portion 14 of the tube 12 and adjacent the central warm air distribution duct 36 there is a space constituting a respective arm of a secondary air duct 44 containing air which will be heated because of the close proximity of the duct to the upper surface of the burner tube 12.
  • a burner/fan assembly 46 At the end of the tube 12 remote from the U-bend 16, there is a burner/fan assembly 46. As can be seen in Figs. 3 and 4, the ends of the tube 12 are connected respectively to a pair of plenum chambers, of which one is an inlet chamber 48 and the other an outlet chamber 50. A burner unit 52 and an air inlet 54 are associated with the inlet chamber 48 and a hot air outlet 55 with the chamber 50. The burner may be adapted to burn any convenient fuel, such as natural gas, and serves to direct a burning mixture of gas and air into the tube 12.
  • the inlet chamber 48 extends at 48A partly across the central region between and beneath the arms of the tube, where the air taken in by the burner unit 52 will tend to be preheated by the heater.
  • the outlet plenum chamber 50 communicates with a restricted throat 50A which creates a Venturi effect, and thence with a duct 56 leading to a fan unit 58 forming part of the assembly 46 and suitably of pull-push type, driven by a motor 60.
  • the fan unit 58 serves to draw air and combustion products through the tube 12, from the inlet 54 to the outlet 55, and thence through the duct 56 via the throat 50A.
  • the air mixture entering the chamber 50 may be typically at about 200°C.
  • the fan 58 may also be arranged to draw in air heated by the heater from the immediate surroundings.
  • the output of the fan is divided between the central distribution duct 36 and the arms of the secondary air duct 44 by adjustable flow control means such as shutters or baffles, illustrated at 44A, adjacent the fan outlet.
  • the output air is directed primarily into the central duct 36, whence it escapes through the apertures 38, to provide a downward flow of heated air from the heater into the space to be heated.
  • the secondary flow from the fan via the flow control means 44A into the secondary duct 44 travels along the arms thereof generally above the tube 12, picking up more heat from the tube (and thus tending to expand) until it is blown downwards by the pressure, creating a further down draught of heated air.
  • the air passing along the secondary duct 44 tends to cool the tube 12 and hence lessen its ability to radiate heat.
  • the amount of radiant heating is variable by adjusting the positions of the flow control means 44A which control the amount of air that passes along the secondary duct. It is thus possible to operate the heater to give a wide range of different ratios of convective to radiant heat outputs.
  • each arm of the burner tube includes an inner tube portion 70, 71 respectively surrounded by a corresponding outer tube portion 72, 73.
  • the ends of the outer tubes at one end of the assembly are closed by an end plate 74 and the ends of the inner tubes adjacent the plate 74 are spaced inwardly from the plate to leave a space 75 within the outer tube 72, 73 which communicates with the adjacent end of the inner tube 70, 71.
  • the other ends of both the inner and outer tubes open into an end chamber 76 with the inner tube ends projecting some way into the chamber and being joined to connectors 78 which extend through an adjacent end plate 79 and into a burner/fan assembly indicated generally at 80.
  • the assembly 80 contains a burner 81, the outlet of which is arranged to inject hot air and combustion products into the adjacent end portion 77 of the inner tube 70.
  • the assembly 80 also includes a fan unit 82 which communicates with an outlet chamber 83 equivalent to the chamber 50 in the previous embodiment.
  • An outlet of the chamber 83 communicates with a central duct 84 extending longitudinally of and above the combustion tubes and arranged generally centrally thereof.
  • the convoluted gas flow path provided by the telescoped inner and outer tubes provides a sufficiently long path for heat exchange purposes and enables the overall length of the apparatus to be significantly decreased, as compared with the embodiment of Figures 1 to 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Flow Control (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Resistance Heating (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
EP90307728A 1989-07-14 1990-07-16 Installation pour commander le courant d'un fluide Expired - Lifetime EP0408396B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90307728T ATE104043T1 (de) 1989-07-14 1990-07-16 Einrichtung zur steuerung eines fluessigkeitsstromes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898916235A GB8916235D0 (en) 1989-07-14 1989-07-14 Space heater
GB8916235 1989-07-14

Publications (3)

Publication Number Publication Date
EP0408396A2 true EP0408396A2 (fr) 1991-01-16
EP0408396A3 EP0408396A3 (en) 1991-05-29
EP0408396B1 EP0408396B1 (fr) 1994-04-06

Family

ID=10660089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90307728A Expired - Lifetime EP0408396B1 (fr) 1989-07-14 1990-07-16 Installation pour commander le courant d'un fluide

Country Status (4)

Country Link
EP (1) EP0408396B1 (fr)
AT (1) ATE104043T1 (fr)
DE (1) DE69007883D1 (fr)
GB (1) GB8916235D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996010720A1 (fr) * 1994-09-30 1996-04-11 Jones, Philomena, Joan Radiateurs
WO1998046946A1 (fr) 1997-04-11 1998-10-22 Jones, Philomena, Joan Radiateurs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2229763A1 (de) * 1972-06-19 1974-01-10 David R Lord Ltd Heizvorrichtung
US3805763A (en) * 1972-08-21 1974-04-23 E Cowan Flush-mountable, self-cooling gas-fired heater
US4727854A (en) * 1986-05-08 1988-03-01 Johnson Arthur C W High efficiency infrared radiant energy heating system and reflector therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2229763A1 (de) * 1972-06-19 1974-01-10 David R Lord Ltd Heizvorrichtung
US3805763A (en) * 1972-08-21 1974-04-23 E Cowan Flush-mountable, self-cooling gas-fired heater
US4727854A (en) * 1986-05-08 1988-03-01 Johnson Arthur C W High efficiency infrared radiant energy heating system and reflector therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996010720A1 (fr) * 1994-09-30 1996-04-11 Jones, Philomena, Joan Radiateurs
US6138662A (en) * 1994-09-30 2000-10-31 Philomena Joan Jones Heaters
EP1099909A3 (fr) * 1994-09-30 2001-09-12 Jones, Philomena Joan Appareil chauffant
WO1998046946A1 (fr) 1997-04-11 1998-10-22 Jones, Philomena, Joan Radiateurs
US6286500B1 (en) * 1997-04-11 2001-09-11 Philomena Joan Jones Heaters

Also Published As

Publication number Publication date
EP0408396B1 (fr) 1994-04-06
DE69007883D1 (de) 1994-05-11
GB8916235D0 (en) 1989-08-31
ATE104043T1 (de) 1994-04-15
EP0408396A3 (en) 1991-05-29

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