WO2002017688A1 - Method of, and immersion heater for, heating of a body of fluid - Google Patents

Method of, and immersion heater for, heating of a body of fluid Download PDF

Info

Publication number
WO2002017688A1
WO2002017688A1 PCT/IB2001/001274 IB0101274W WO0217688A1 WO 2002017688 A1 WO2002017688 A1 WO 2002017688A1 IB 0101274 W IB0101274 W IB 0101274W WO 0217688 A1 WO0217688 A1 WO 0217688A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
shroud
immersion heater
heating
heat source
Prior art date
Application number
PCT/IB2001/001274
Other languages
French (fr)
Inventor
Peter John Meffan
Original Assignee
Peter John Meffan
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 Peter John Meffan filed Critical Peter John Meffan
Priority to AU2001272689A priority Critical patent/AU2001272689A1/en
Publication of WO2002017688A1 publication Critical patent/WO2002017688A1/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/80—Portable immersion heaters

Definitions

  • THIS INVENTION relates to the heating of fluid by means of an immersion heater. It relates in particular to a method of improving the efficiency of such heating, and to an immersion heater therefor.
  • a method of heating a body of fluid by means of an immersion heater including the steps of heating the fluid in a restricted zone around the heater; and replacing such heated fluid in the zone by convection with fluid from outside the zone.
  • the restricted zone may be defined by a shroud extending around the heater, and the method may include replacing heated fluid in the restricted zone with fluid from outside the restricted zone by fluid flow through spaced openings in the shroud.
  • a heating device which includes a shroud having spaced openings, and which is shaped and dimensioned to receive an immersion heater within it.
  • the shroud may be elongate, and the spacing of the openings may be longitudinal. Still further in accordance with the invention there is provided an immersion heater which includes a heat source; and a shroud defining a restricted zone around the heat source, the shroud having spaced openings.
  • the shroud may be tubular around the heat source, and one of the openings may be at one end of the tube, and at least one other opening may be longitudinally spaced therefrom and may be through a wall of the tube.
  • the heat source may include an electric element heater.
  • the immersion heater may include support means for supporting it in a vessel containing fluid to be heated.
  • Figure 1 shows a side elevation of an immersion heater in accordance with the invention in a body of fluid contained in a vessel
  • FIG. 2 shows a side elevation of another embodiment of the immersion heater, in a body of fluid contained in a vessel.
  • reference numeral 10 refers to a vessel containing a body of fluid 1 2 containing within it an immersion heater 14 in accordance with the invention.
  • the immersion heater 14 includes a heat source 1 6 within a shroud 1 8, having spaced openings 20 and 22.
  • the heat source 16 is in the form of an electric element which is elongate and is energized via electrical leads 1 6.1 .
  • the shroud 1 8 is in the form of a tube, the opening 20 being provided at an end of the tube, and the openings 22, through a wall of the tube, longitudinally spaced therefrom.
  • the shroud serves to avoid direct contact between the element 1 6 and a user's skin thereby reducing the risk of burns.
  • the shroud 1 8 may be of a material, such as a synthetic plastics material, which is a relatively poor conductor of heat.
  • the shroud may be of any suitable material.
  • the heat source 1 6 is in the form of a U-shaped elongate electric element, within the shroud 1 8.
  • the immersion heater 14 is immersed in a body of fluid 1 2, typically water, contained in the vessel 10.
  • the shroud 1 8 defines a restricted zone 18.1 within it, and it is within this restricted zone, that the heat source 1 6 heats the fluid.
  • the fluid heated in this restricted zone 1 8.1 is heated rapidly and passes by convection through the openings 22, in the direction indicated by arrows 24.
  • Such fluid is replaced by fluid entering the restricted zone 1 8.1 , in the direction indicated by the arrows 26, via the opening 20 at the end of the shroud 18.
  • the Applicant believes, that the fluid passing from the restricted zone 18.1 to the body of fluid 12 causes improved heat transfer from the heat source 16 to the body of fluid 12 and hence a more efficient heating of the body of fluid 12.
  • the applicant believes that the invention will find application particularly in the heating of water, eg. in rural areas, in which case the vessel 10 may be a bucket, bath of the like.

Landscapes

  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Abstract

The invention provides a method and device for heating a body of fluid. The device includes a heat source and a shroud defining a restricted zone around the heat source. The shroud has spaced openings through which fluid can pass. The body fluid is heated by placing the heat source and shroud in the body of fluid. Fluid in the restricted zone is heated and then replaced by convection with fluid from outside the restricted zone.

Description

METHOD OF, AND IMMERSION HEATER FOR, HEATING OF A BODY OF FLUID
THIS INVENTION relates to the heating of fluid by means of an immersion heater. It relates in particular to a method of improving the efficiency of such heating, and to an immersion heater therefor.
According to the invention there is provided a method of heating a body of fluid by means of an immersion heater, the method including the steps of heating the fluid in a restricted zone around the heater; and replacing such heated fluid in the zone by convection with fluid from outside the zone.
Typically the restricted zone may be defined by a shroud extending around the heater, and the method may include replacing heated fluid in the restricted zone with fluid from outside the restricted zone by fluid flow through spaced openings in the shroud.
Further in accordance with the invention there is provided a heating device which includes a shroud having spaced openings, and which is shaped and dimensioned to receive an immersion heater within it.
The shroud may be elongate, and the spacing of the openings may be longitudinal. Still further in accordance with the invention there is provided an immersion heater which includes a heat source; and a shroud defining a restricted zone around the heat source, the shroud having spaced openings.
The shroud may be tubular around the heat source, and one of the openings may be at one end of the tube, and at least one other opening may be longitudinally spaced therefrom and may be through a wall of the tube.
More specifically the heat source may include an electric element heater.
In more sophisticated embodiments of the invention the immersion heater may include support means for supporting it in a vessel containing fluid to be heated.
The invention is now described, by way of example, with reference to the accompanying diagrammatic drawings.
In the drawings Figure 1 shows a side elevation of an immersion heater in accordance with the invention in a body of fluid contained in a vessel; and
Figure 2 shows a side elevation of another embodiment of the immersion heater, in a body of fluid contained in a vessel.. Referring to the drawings, reference numeral 10 refers to a vessel containing a body of fluid 1 2 containing within it an immersion heater 14 in accordance with the invention. The immersion heater 14 includes a heat source 1 6 within a shroud 1 8, having spaced openings 20 and 22. The heat source 16 is in the form of an electric element which is elongate and is energized via electrical leads 1 6.1 . The shroud 1 8 is in the form of a tube, the opening 20 being provided at an end of the tube, and the openings 22, through a wall of the tube, longitudinally spaced therefrom.
The shroud serves to avoid direct contact between the element 1 6 and a user's skin thereby reducing the risk of burns. In this regard, the shroud 1 8 may be of a material, such as a synthetic plastics material, which is a relatively poor conductor of heat. Naturally, however, the shroud may be of any suitable material.
Referring now to Figure 2 of the drawings, like reference numerals refer to like parts. In this embodiment , the heat source 1 6 is in the form of a U-shaped elongate electric element, within the shroud 1 8.
In use, the immersion heater 14 is immersed in a body of fluid 1 2, typically water, contained in the vessel 10. The shroud 1 8 defines a restricted zone 18.1 within it, and it is within this restricted zone, that the heat source 1 6 heats the fluid. The fluid heated in this restricted zone 1 8.1 is heated rapidly and passes by convection through the openings 22, in the direction indicated by arrows 24. Such fluid is replaced by fluid entering the restricted zone 1 8.1 , in the direction indicated by the arrows 26, via the opening 20 at the end of the shroud 18.
The Applicant believes, that the fluid passing from the restricted zone 18.1 to the body of fluid 12 causes improved heat transfer from the heat source 16 to the body of fluid 12 and hence a more efficient heating of the body of fluid 12. The applicant believes that the invention will find application particularly in the heating of water, eg. in rural areas, in which case the vessel 10 may be a bucket, bath of the like.

Claims

CLAIMS:
1 . A method of heating a body of fluid by means of an immersion heater, the method including the steps of heating the fluid in a restricted zone around the heater; and replacing such heated fluid in the zone by convection with fluid from outside the zone.
2. A method as claimed in claim 1 , in which the restricted zone is defined by a shroud extending around the heater, and in which replacing heated fluid in the restricted zone with fluid from outside the restricted zone is by fluid flow through spaced openings in the shroud.
3. A heating device which includes a shroud having spaced openings, and which is shaped and dimensioned to receive an immersion heater within it.
4. A heating device as claimed in Claim 3, in which the shroud is elongate, and in which the spacing of the openings is longitudinal.
5. An immersion heater which includes a heat source; and a shroud defining a restricted zone around the heat source, the shroud having spaced openings.
6. An immersion heater as claimed in Claim 5, in which the shroud is tubular around the heat source, and in which one of the openings is at one end of the tube, and at least one other opening is longitudinally spaced therefrom.
7. An immersion heater as claimed in claim 5 or 6, in which the heat source includes an electric element heater.
8. An immersion heater as claimed in any one of the claims 5 to 7 inclusive, which includes support means for supporting it in a vessel containing fluid to be heated.
9. A new method of heating a body of fluid substantially as hereinbefore described.
10. A new device, substantially as hereinbefore described and illustrated.
1 1 . A new heating device, substantially as hereinbefore described and illustrated.
1 2. A new immersion heater, substantially as hereinbefore described and illustrated.
PCT/IB2001/001274 2000-08-23 2001-07-18 Method of, and immersion heater for, heating of a body of fluid WO2002017688A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001272689A AU2001272689A1 (en) 2000-08-23 2001-07-18 Method of, and immersion heater for, heating of a body of fluid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2000/4323 2000-08-23
ZA200004323 2000-08-23

Publications (1)

Publication Number Publication Date
WO2002017688A1 true WO2002017688A1 (en) 2002-02-28

Family

ID=25588879

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/001274 WO2002017688A1 (en) 2000-08-23 2001-07-18 Method of, and immersion heater for, heating of a body of fluid

Country Status (2)

Country Link
AU (1) AU2001272689A1 (en)
WO (1) WO2002017688A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH142097A (en) * 1929-05-17 1930-09-15 Bruchhaus Erwin Electric immersion heater.
US2429303A (en) * 1945-07-02 1947-10-21 Simon L Apatow Electric immersion heater
US3619565A (en) * 1970-08-19 1971-11-09 Sternco Ind Inc Electric immersion heater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH142097A (en) * 1929-05-17 1930-09-15 Bruchhaus Erwin Electric immersion heater.
US2429303A (en) * 1945-07-02 1947-10-21 Simon L Apatow Electric immersion heater
US3619565A (en) * 1970-08-19 1971-11-09 Sternco Ind Inc Electric immersion heater

Also Published As

Publication number Publication date
AU2001272689A1 (en) 2002-03-04

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