WO2009060475A1 - Improved heat exchanger for solar energy generators - Google Patents

Improved heat exchanger for solar energy generators Download PDF

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Publication number
WO2009060475A1
WO2009060475A1 PCT/IT2007/000773 IT2007000773W WO2009060475A1 WO 2009060475 A1 WO2009060475 A1 WO 2009060475A1 IT 2007000773 W IT2007000773 W IT 2007000773W WO 2009060475 A1 WO2009060475 A1 WO 2009060475A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
fins
previous
exchanger according
duct
Prior art date
Application number
PCT/IT2007/000773
Other languages
French (fr)
Inventor
Reginald Ian Williams
Original Assignee
Reginald Ian Williams
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 Reginald Ian Williams filed Critical Reginald Ian Williams
Priority to PCT/IT2007/000773 priority Critical patent/WO2009060475A1/en
Publication of WO2009060475A1 publication Critical patent/WO2009060475A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F28F1/16—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being integral with the element, e.g. formed by extrusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
    • F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
    • F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
    • F24S2010/751—Special fins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems

Definitions

  • the present invention relates to a heat exchanger for solar energy generators, and in particular to an improved heat exchanger which can be employed in the collectors receiving the solar rays from the reflectors of these generators.
  • the present invention also relates to a solar generator comprising said heat exchanger.
  • WO 2006/131946 discloses a heat exchanger comprising pluralities of fins arranged transversally with respect to the ducts for the fluid to be heated, wherein the edges of two adjacent fins converge with an angle less than 90°, and so on, so as to form a series of pairs of fins with the edges converging two by two.
  • This heat exchanger is relatively expensive and difficult to be manufactured and installed.
  • the heat exchanger according to the present invention is not only economic and easy to be manufactured and installed, especially if it is made of a single extruded piece of aluminum, but has also a high efficiency in absorbing the solar energy, in particular in generators with concave reflectors which concentrate solar rays on a collector comprising this heat exchanger.
  • figure 2 shows a partial and enlarged side view of a generator comprising the heat exchanger of figure 1;
  • figure 3 shows detail III of figure 2.
  • the heat exchanger comprises in a known way at least one duct 1 suitable for being exposed to a source of solar rays 2, for example reflector 3 of a solar energy generator, and for containing a fluid to be heated with the energy transmitted by these rays.
  • Reflector 3 is preferably a concave reflector with the concavity facing duct 1.
  • a plurality of fins 4 is arranged in a substantially radial manner with respect to duct 1 and is substantially parallel to this duct.
  • the free edges 4a, that is the edges facing solar rays 2 reflected by reflector 3, of fins 4 are suitably tapered with an angle a less than 90°.
  • grooves 5 between fins 4 are tapered with an angle b less than 90°.
  • Fins 4 form thus an at least partially triangular wave which develops around duct 1 along a substantially semicircular arc facing reflector 3.
  • One or more fastening members 6, in particular a pair of L-shaped profiles, are integral with duct 1 on the side opposite to fins 4 for fastening the heat exchanger to a support structure 7.
  • Duct 1 and fins 4, as well as fastening members 6, if present, are preferably made of a single extruded piece of a conductive material, in particular aluminum or its alloys. Angles a and/or b are preferably comprised between 25° and 45°. In particular, angles a and b are substantially the same. Fins 4 are dark and opaque, so as to improve the absorption of the solar energy.
  • One or more screens 8 are arranged in a substantially perpendicular manner to fins 4 for preventing longitudinal air streams.
  • Screens 8 have a substantially semicircular outer profile and an inner profile substantially complementary to the outer profile of fins 4, namely with a series of radial slits in which fins 4 are arranged, preferably without a mutual contact between fins 4 and screens 8.
  • One or more radial slits 9 of each screen 8 have a profile slightly shorter than the other radial slits for contacting the edge of a fin 4 and keeping screen 8 in position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Dispersion Chemistry (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Heat exchanger comprising at least one duct (1) suitable for being exposed to a source (3) or solar rays (2) and for containing a fluid to be heated with the energy transmitted by these rays (2), wherein a plurality of fins (4) is arranged in a substantially radial manner with respect to the duct (1) and is substantially parallel to this duct (1), the free edges (4a) of the fins (4) being tapered with an angle (a) less than 90°. The present invention also relates to a solar generator comprising said heat exchanger.

Description

IMPROVED HEAT EXCHANGER FOR SOLARENERGY GENERATORS
The present invention relates to a heat exchanger for solar energy generators, and in particular to an improved heat exchanger which can be employed in the collectors receiving the solar rays from the reflectors of these generators. The present invention also relates to a solar generator comprising said heat exchanger.
WO 2006/131946 discloses a heat exchanger comprising pluralities of fins arranged transversally with respect to the ducts for the fluid to be heated, wherein the edges of two adjacent fins converge with an angle less than 90°, and so on, so as to form a series of pairs of fins with the edges converging two by two. This heat exchanger is relatively expensive and difficult to be manufactured and installed.
It is therefore an object of the present invention to improve said known heat exchanger. Said object is achieved with a heat exchanger and a solar generator, whose main features are disclosed in claims 1 and 16, respectively, while other features are disclosed in the remaining claims.
Thanks to the particular fins which is provided with, the heat exchanger according to the present invention is not only economic and easy to be manufactured and installed, especially if it is made of a single extruded piece of aluminum, but has also a high efficiency in absorbing the solar energy, in particular in generators with concave reflectors which concentrate solar rays on a collector comprising this heat exchanger.
Further advantages and features of the heat exchanger according to the present invention will become clear to those skilled in the art from the following detailed and non-limiting description of an embodiment thereof with reference to the attached drawings, wherein: - figure 1 shows a partial perspective view of the heat exchanger;
- figure 2 shows a partial and enlarged side view of a generator comprising the heat exchanger of figure 1; and
- figure 3 shows detail III of figure 2.
Referring to said figures, it is seen that the heat exchanger according to the present invention comprises in a known way at least one duct 1 suitable for being exposed to a source of solar rays 2, for example reflector 3 of a solar energy generator, and for containing a fluid to be heated with the energy transmitted by these rays. Reflector 3 is preferably a concave reflector with the concavity facing duct 1.
According to the invention, a plurality of fins 4 is arranged in a substantially radial manner with respect to duct 1 and is substantially parallel to this duct. The free edges 4a, that is the edges facing solar rays 2 reflected by reflector 3, of fins 4 are suitably tapered with an angle a less than 90°. Also grooves 5 between fins 4 are tapered with an angle b less than 90°. Fins 4 form thus an at least partially triangular wave which develops around duct 1 along a substantially semicircular arc facing reflector 3. One or more fastening members 6, in particular a pair of L-shaped profiles, are integral with duct 1 on the side opposite to fins 4 for fastening the heat exchanger to a support structure 7. Duct 1 and fins 4, as well as fastening members 6, if present, are preferably made of a single extruded piece of a conductive material, in particular aluminum or its alloys. Angles a and/or b are preferably comprised between 25° and 45°. In particular, angles a and b are substantially the same. Fins 4 are dark and opaque, so as to improve the absorption of the solar energy. One or more screens 8 are arranged in a substantially perpendicular manner to fins 4 for preventing longitudinal air streams. Screens 8 have a substantially semicircular outer profile and an inner profile substantially complementary to the outer profile of fins 4, namely with a series of radial slits in which fins 4 are arranged, preferably without a mutual contact between fins 4 and screens 8. One or more radial slits 9 of each screen 8 have a profile slightly shorter than the other radial slits for contacting the edge of a fin 4 and keeping screen 8 in position.
Possible modifications and/or additions may be made by those skilled in the art to the hereinabove disclosed and illustrated embodiment while remaining within the scope of the following claims.

Claims

1. Heat exchanger comprising at least one duct (1) suitable for being exposed to a source (3) or solar rays (2) and for containing a fluid to be heated with the energy transmitted by these rays (2), characterized in that a plurality of fins (4) is arranged in a substantially radial manner with respect to the duct (1) and is substantially parallel to this duct (1), the free edges (4a) of the fins (4) being tapered with an angle (a) less than 90°.
2. Heat exchanger according to the previous claim, characterized in that the grooves (5) between the fins (4) are tapered with an angle (b) less than 90°.
3. Heat exchanger according to one of the previous claims, characterized in that the fins (4) form an at least partially triangular wave which develops around the duct (1).
4. Heat exchanger according to the previous claim, characterized in that said at least partially triangular wave develops around the duct (1) along a substantially semicircular arc.
5. Heat exchanger according to one of the previous claims, characterized in that the duct (1) and the fins (4) are made of a single extruded piece of a conductive material, in particular aluminum or its alloys.
6. Heat exchanger according to one of the previous claims, characterized in that one or more fastening members (6) are integral with the duct (1) on the side opposite to the fins (4).
7. Heat exchanger according to the previous claim, characterized in that said fastening members (6) comprise a pair of L-shaped profiles.
8. Heat exchanger according to claim 6 or 7, characterized in that said fastening members (6) are made of a single extruded piece of a conductive material, in particular aluminum or its alloys, with the duct (1) and the fins (4).
9. Heat exchanger according to one of the previous claims, characterized in that said angles (a, b) are comprised between 25° and 45°.
10. Heat exchanger according to one of the previous claims, characterized in that said angles (a, b) are substantially the same. - A -
11. Heat exchanger according to one of the previous claims, characterized in that the fins (4) are dark and opaque.
12. Heat exchanger according to one of the previous claims, characterized in that one or more screens (8) are arranged in a manner substantially perpendicular to the fins (4).
13. Heat exchanger according to the previous claim, characterized in that the screens (8) have an inner profile substantially complementary to the outer profile of the fins (4).
14. Heat exchanger according to the previous claim, characterized in that the screens (8) have a series of radial slits in which the fins (4) are arranged without a mutual contact between the fins (4) and the screens (8).
15. Heat exchanger according to the previous claim, characterized in that one or more radial slits (9) of a screen (8) have a profile shorter than the other radial slits for contacting a fin (4) and keeping the screen (8) in position.
16. Solar generator comprising at least one reflector (3) suitable for reflecting solar rays (2) on a collector, characterized in that this collector comprises a heat exchanger (1, 4) according to one of the previous claims, whose fins (4) face the reflector (3).
17. Solar generator according to the previous claim, characterized in that said reflector (3) is a concave reflector (3) having the concavity facing the heat exchanger (1, 4).
PCT/IT2007/000773 2007-11-05 2007-11-05 Improved heat exchanger for solar energy generators WO2009060475A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000773 WO2009060475A1 (en) 2007-11-05 2007-11-05 Improved heat exchanger for solar energy generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000773 WO2009060475A1 (en) 2007-11-05 2007-11-05 Improved heat exchanger for solar energy generators

Publications (1)

Publication Number Publication Date
WO2009060475A1 true WO2009060475A1 (en) 2009-05-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2007/000773 WO2009060475A1 (en) 2007-11-05 2007-11-05 Improved heat exchanger for solar energy generators

Country Status (1)

Country Link
WO (1) WO2009060475A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110180058A1 (en) * 2011-04-08 2011-07-28 Mackay Cameron R Solar air heating device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003364A (en) * 1975-02-26 1977-01-18 Balkus Jr Carl E Solar heating system
US4074678A (en) * 1974-01-07 1978-02-21 Mario Posnansky Method and apparatus for heating a fluid medium by means of solar energy
US4153039A (en) * 1977-01-07 1979-05-08 Carroll John H Focusing solar energy apparatus
US4248211A (en) * 1979-09-14 1981-02-03 Robert R. Womack Stellate solar collector
DE3046380A1 (en) * 1980-12-09 1982-07-22 Fa. Manfred Helfrecht, 8598 Waldershof Solar heat conserving roof or facade ducting system - has panels mounted on supports for individual laid combined pipe sections
US4394859A (en) * 1981-10-27 1983-07-26 The United States Of America As Represented By The United States Department Of Energy Central solar energy receiver
WO1994023257A1 (en) * 1993-03-29 1994-10-13 Melanesia International Trust Company Limited Heat exchanger assembly
DE29918565U1 (en) * 1999-10-21 2000-01-05 Heinen, Thomas, 42699 Solingen Device for heating media

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074678A (en) * 1974-01-07 1978-02-21 Mario Posnansky Method and apparatus for heating a fluid medium by means of solar energy
US4003364A (en) * 1975-02-26 1977-01-18 Balkus Jr Carl E Solar heating system
US4153039A (en) * 1977-01-07 1979-05-08 Carroll John H Focusing solar energy apparatus
US4248211A (en) * 1979-09-14 1981-02-03 Robert R. Womack Stellate solar collector
DE3046380A1 (en) * 1980-12-09 1982-07-22 Fa. Manfred Helfrecht, 8598 Waldershof Solar heat conserving roof or facade ducting system - has panels mounted on supports for individual laid combined pipe sections
US4394859A (en) * 1981-10-27 1983-07-26 The United States Of America As Represented By The United States Department Of Energy Central solar energy receiver
WO1994023257A1 (en) * 1993-03-29 1994-10-13 Melanesia International Trust Company Limited Heat exchanger assembly
DE29918565U1 (en) * 1999-10-21 2000-01-05 Heinen, Thomas, 42699 Solingen Device for heating media

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110180058A1 (en) * 2011-04-08 2011-07-28 Mackay Cameron R Solar air heating device
CN103620315A (en) * 2011-04-08 2014-03-05 卡梅隆·理查德·麦基 Solar air heating device
US8863741B2 (en) * 2011-04-08 2014-10-21 Cameron R MacKay Solar air heating device

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