EP1235039A2 - Echangeur de chaleur à spirale constitué d'un élément tubulaire à section en forme de goutte - Google Patents

Echangeur de chaleur à spirale constitué d'un élément tubulaire à section en forme de goutte Download PDF

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Publication number
EP1235039A2
EP1235039A2 EP02003789A EP02003789A EP1235039A2 EP 1235039 A2 EP1235039 A2 EP 1235039A2 EP 02003789 A EP02003789 A EP 02003789A EP 02003789 A EP02003789 A EP 02003789A EP 1235039 A2 EP1235039 A2 EP 1235039A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
cross
pipe
section
domestic use
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.)
Withdrawn
Application number
EP02003789A
Other languages
German (de)
English (en)
Other versions
EP1235039A3 (fr
Inventor
Flavio Mele
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.)
METECH Srl
Original Assignee
METECH Srl
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
Priority claimed from ITPC20010006 external-priority patent/ITPC20010006A1/it
Priority claimed from ITPC20020001 external-priority patent/ITPC20020001A1/it
Application filed by METECH Srl filed Critical METECH Srl
Publication of EP1235039A2 publication Critical patent/EP1235039A2/fr
Publication of EP1235039A3 publication Critical patent/EP1235039A3/fr
Withdrawn legal-status Critical Current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
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water

Definitions

  • This invention relates to a special profile for pipes intended for use in a heat exchanger for boilers for domestic use which are designed to produce hot water for heating and for supply to sanitary fittings.
  • the invention relates to a heat exchanger that is particularly suitable for use in boilers designed for heating and production of sanitary water, wherein the coil through which the water passes has a drop-shaped cross-section, and more particularly a cross-section in which the lower part is semi-circular, or preferably parabola-shaped with a rounded tip, and the upper part is substantially cusp-shaped, ie. has a cross-section that tapers towards the top, with slightly concave sides.
  • the heat exchangers employed in boilers for domestic use, especially wall-mounted boilers, generally include a coil attached to a plurality of fins to ensure better heat exchange.
  • boilers especially wall-mounted boilers
  • the space available to instal the heat exchanger is fairly limited (there is an increasing tendency to reduce size nowadays).
  • the pipes used to make the coil usually have round or oval cross-sections. Space being equal, a round shape limits the number of pipes used and therefore the possibility of achieving balanced heat distribution.
  • Round pipes have the advantage of requiring a pump with a low head to circulate the water; however, although the ratio between the circumference and area of the cross-section is minimal, the quantity of heat transferred to the fluid is also minimal, with the result that the risk of noise, generally due to resonance, is increased when the usual diameters are employed.
  • Pipes with an elliptical or oval cross-section have been used to increase the amount of heat that can be transferred during a given unit of time, and to improve the dynamics of the flow.
  • this configuration enables more pipes (usually six or seven) to be fitted into a heat exchanger with the same overall dimensions.
  • the invention solves this problem by offering a heat exchanger with pipes having a substantially drop-shaped cross-section, and preferably a cross-section in which the lower part of the pipe has a semicircular, arc or elliptical shape, or preferably a parabola shape, while the upper part tapers towards the top and has concave sides.
  • the coil is made with a pipe having a cross-section such that the ratio between the length of the circumference and the area of the said cross-section is as suitable as possible, and produces the ideal loss of head necessary for the distribution of heat and pressure gradients in the heat exchanger compatibly with the ease of circulation of the water, and in particular a larger ratio than would be obtained with a circular cross-section.
  • the pipe shown as 1, has a substantially drop-shaped cross-section; the lower part 2 has a substantially semicircular, arc or elliptical shape, while upper part 3 has a cusp shape, or at any rate a cross-section which has two concave sides and tapers towards the top.
  • the lower part 2 of pipe 1 has a substantially parabola shape, while the upper part 3 has a cross-section with two concave sides 4.
  • the upper section 5, which connects concave sides 4, preferably has an arc-shaped cross-section.
  • this configuration promotes the upward flow of fumes, thus preventing stagnation and ensuring a more efficient heat exchange.
  • a second pipe 2 inside pipe 1 which may have the shape shown in figure 2, or any other shape which leaves a cavity with a sufficient cross-section to allow easy circulation of primary water, even when used with a pump having a low head.
  • Inner pipe 6 will advantageously have the shape shown in figure 6, with a lower stem 7 connected to an upper bulb 8 of larger dimensions.
  • pipe 6 can be contained precisely inside a round pipe, illustrated with a dotted line and indicated as number 9, which is used as the base for making outer pipe 1 of the heat exchanger, and is suitably shaped by known techniques to give the pipe the drop-shaped cross-section described above.
  • the upper side of bulb 8, indicated as 10, therefore has an arc-shaped contour with a radius equal to that of round pipe 9 from which outer pipe 1 of the heat exchanger is obtained.
  • the ratio between the cross-sections of pipes 6 and 1 can vary according to the various applications; however, it has been found that the best results are obtained with ratios of between 1:2,5 and 1:4.
  • Pipes of this shape can be obtained by deforming a cylindrical pipe, for example by rolling, profiling or other known system, or can be directly made with the required cross-sectional shape.
  • heat exchanger fins 13 will have the configuration shown in fig. 4.
  • Protuberances 14 or grooves 15, obtained by deforming the metal used to make fins 13, are present on the surface of the said fins, and create a degree of turbulence which aids the heat exchange.
  • the configuration of the pipes in the heat exchanger in accordance with the invention improves the heat exchange, thus allowing the size of the heat exchanger to be reduced with no loss of exchange power or efficiency, and enables primary water to circulate easily, even when a pump with a low head is used.

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  • 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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP02003789A 2001-02-23 2002-02-20 Echangeur de chaleur à spirale constitué d'un élément tubulaire à section en forme de goutte Withdrawn EP1235039A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITPC20010006 ITPC20010006A1 (it) 2001-02-23 2001-02-23 Sambiatore di calorecon serpentina costituita da un elemento tubolarecon sezione a goccia
ITPC010006 2001-02-23
ITPC20020001 ITPC20020001A1 (it) 2002-01-11 2002-01-11 Scambiatore di calore con serpentina costituita da un elemento tubolare con sezione a goccia.
ITPC020001 2002-01-11

Publications (2)

Publication Number Publication Date
EP1235039A2 true EP1235039A2 (fr) 2002-08-28
EP1235039A3 EP1235039A3 (fr) 2004-03-03

Family

ID=26332802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02003789A Withdrawn EP1235039A3 (fr) 2001-02-23 2002-02-20 Echangeur de chaleur à spirale constitué d'un élément tubulaire à section en forme de goutte

Country Status (1)

Country Link
EP (1) EP1235039A3 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885936A (en) * 1972-03-01 1975-05-27 Lund Basil Gilbert Alfred Heat exchangers
US4393926A (en) * 1981-04-06 1983-07-19 Appel Gary H Clover heat exchanger core
DE3320265A1 (de) * 1983-06-04 1984-12-06 Heinrich Dr.-Ing. 4290 Bocholt Hampel Doppelrohrwaermetauscher
EP0307030A1 (fr) * 1987-08-28 1989-03-15 Teunis Jan Treur Tube chauffant
EP0567398A1 (fr) * 1992-04-21 1993-10-27 Valeo Thermique Moteur Paroi tubulaire de courbure variable et procédé pour la fabrication d'une boîte à fluide d'échangeur de chaleur
US5355946A (en) * 1992-10-09 1994-10-18 Mtu Motoren-Und Turbinen-Union Munchen Gmbh Teardrop-shaped heat exchange tube and its process of manufacture
EP0775876A1 (fr) * 1995-11-21 1997-05-28 E.L.M. Leblanc Corps de chauffe mixte à serpentin à section droite complexe

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885936A (en) * 1972-03-01 1975-05-27 Lund Basil Gilbert Alfred Heat exchangers
US4393926A (en) * 1981-04-06 1983-07-19 Appel Gary H Clover heat exchanger core
DE3320265A1 (de) * 1983-06-04 1984-12-06 Heinrich Dr.-Ing. 4290 Bocholt Hampel Doppelrohrwaermetauscher
EP0307030A1 (fr) * 1987-08-28 1989-03-15 Teunis Jan Treur Tube chauffant
EP0567398A1 (fr) * 1992-04-21 1993-10-27 Valeo Thermique Moteur Paroi tubulaire de courbure variable et procédé pour la fabrication d'une boîte à fluide d'échangeur de chaleur
US5355946A (en) * 1992-10-09 1994-10-18 Mtu Motoren-Und Turbinen-Union Munchen Gmbh Teardrop-shaped heat exchange tube and its process of manufacture
EP0775876A1 (fr) * 1995-11-21 1997-05-28 E.L.M. Leblanc Corps de chauffe mixte à serpentin à section droite complexe

Also Published As

Publication number Publication date
EP1235039A3 (fr) 2004-03-03

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