GB2462107A - Solar collector comprising lenses - Google Patents

Solar collector comprising lenses Download PDF

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Publication number
GB2462107A
GB2462107A GB0813564A GB0813564A GB2462107A GB 2462107 A GB2462107 A GB 2462107A GB 0813564 A GB0813564 A GB 0813564A GB 0813564 A GB0813564 A GB 0813564A GB 2462107 A GB2462107 A GB 2462107A
Authority
GB
United Kingdom
Prior art keywords
sunlight
lenses
heat
heat exchanger
collector 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.)
Withdrawn
Application number
GB0813564A
Other versions
GB0813564D0 (en
Inventor
Peter Brown
Original Assignee
Peter Brown
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 Brown filed Critical Peter Brown
Priority to GB0813564A priority Critical patent/GB2462107A/en
Publication of GB0813564D0 publication Critical patent/GB0813564D0/en
Publication of GB2462107A publication Critical patent/GB2462107A/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/30Arrangements for concentrating solar-rays for solar heat collectors with lenses
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00Arrangements for moving or orienting solar heat collector modules
    • F24S30/20Arrangements for moving or orienting solar heat collector modules for linear movement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00Arrangements for moving or orienting solar heat collector modules
    • F24S30/40Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F24S30/45Arrangements for moving or orienting solar heat collector modules for rotary movement with two rotation axes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00Arrangements for storing heat collected by solar heat collectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00Arrangements for moving or orienting solar heat collector modules
    • F24S2030/10Special components
    • F24S2030/11Driving means
    • F24S2030/115Linear actuators, e.g. pneumatic cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0056Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B23/00Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy
    • Y02E10/41Tower concentrators
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy
    • Y02E10/47Mountings or tracking

Abstract

A sunlight collector 10 comprises one or more biconvex lenses 20, 30 and one or more achromatic doublet lenses 50 for focusing incident sunlight, preferably in both the visible and ultraviolet (UV) ranges of the electromagnetic spectrum. The position of the biconvex lenses is adjustable in relation to the achromatic doublet lenses. Preferably, the collector comprises two tubes 15, 40, one mounted telescopically within the other, where the biconvex lenses are held in one tube and the achromatic doublet lenses are held in the other tube. The collector may be moved so that it tracks the progress of the sun through the sky. Preferably, the focused sunlight (140, figs.4and5) is utilised for heating by directing it onto a heat exchanger (80, fig.4) or a heat store (150, fig.5). The heat exchanger may comprise an array of perforated cast iron plates (110, fig.4). The heat store may comprise one or more fluid carrying pipes (160, fig.5) buried within black volcanic sand.

Description

A Sunlight Collector The present invention relates to a sunlight collector. In particular, the invention relates to a sunlight collector which heats up a heat exchanger.

Sunlight collectors are known which comprise mirrors and lenses. The present invention relates to a sunlight collector which relies only on lenses.

In one aspect the invention provides a sunlight collector comprising one or more biconvex lenses and one or more achromatic doublet lenses for focusing incident sunlight, wherein the position of the one or more biconvex lenses is adjustable in relation to the one or more achromatic doublet lenses.

The sunlight collector may comprise two tubes, one held telescopically within the other, wherein the one or more biconvex lenses are held in one tube and the one or more achromatic doublet lenses are held in the other tube. The biconvex lenses may be arranged in an annulus around the inside perimeter of one of the tubes such that they all lie in a radial plane relative to the longitudinal axis of the tube. An additional lens may be arranged in the centre of the annulus. The arrangement of lenses may focus the incident sunlight onto the one or more achromatic doublet lenses.

The sunlight collector may further comprise means for adjustably moving one tube relative to the other tube along the longitudinal axes of the tubes. The means may be hydraulic, pneumatic, or through the use of electric motors. This relative movement may be used to adjust the focus of the sunlight.

The sunlight collector may further comprise means for moving the collector so that it tracks the progress of the sun through the sky. Such means may be by the use of electric motors. It is also possible to incorporate light sensors which may be connected to a control unit. The control unit may control the movement of the solar collector to track the sun's progress across the sky based on the information received from the light sensors.

The sunlight collector may further comprise a heat exchanger, onto which the resultant focused sunlight is directed for heating of the heat exchanger. The heat exchanger may comprise an array of plates at least some of which are perforated.

The arrangement of the plates and/or possibly the perforations may allow the focused light to penetrate the heat exchanger such that it falls on the heat exchanger's core.

The plates and/or the core of the heat exchanger may be cast iron.

The sunlight collector may further comprise means for transferring the heat stored in the heat exchanger for utilisation of the heat. The means for transferring the heat may be a current of air. The heat may be utilised to generate electricity, and/or for space/water heating. The perforations in the plates may also allow the air to flow across and through the heat exchanger to facilitate heat exchange. Other media, such as water may also be used instead of air.

The solar collector may also include means for rotating the heat exchanger to allow even heat distribution and exchange with the transferring medium.

A fan or pump may be incorporated to move the medium across the heat exchanger. The heated medium may then transfer heat to other apparatus for use with such systems as steam turbines, combined heat and power plants and domestic hot water devices.

The arrangement of lenses may collect and focus sunlight in both the visible and ultraviolet ranges of the electromagnetic spectrum.

The sunlight collector may comprise a heat store upon which the focused sunlight may be directed. The heat store may comprise black volcanic sand and one or more pipes buried \vithin the sand, the one or more pipes for carrying fluid for transferring heat away from the sand for utilisation thereafter.

The above and other characteristics, features and advantages of the present invention wil become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. This description is given for the sake of example only, without limiting the scope of the invention. The reference figures quoted below refer to the attached drawings.

Figure 1 is a plan view of part of a solar collector according to one embodiment of the present invention; Figure 2 is an elevational cross-sectional view of a solar collector according to one embodiment of the present invention; Figure 3 is an elevational view of the solar collector of Figure 2; Figure 4 is an elevational cross-sectional view of a heat exchanger according to one embodiment of the present invention; and Figure 5 is an elevational cross-section through a heat store according to one embodiment of the present invention.

The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the si2e of some of the elements may be exaggerated and not drawn to scale for illustrative purposes. The dimensions and the relative dimensions do not correspond to actual reductions to practice of the invention.

Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequence, either temporally, spatially, in ranking or in any other manner. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

Moreover, the terms top, bottom, over, under and the hke in the description and the claims are used for descriptive purposes and not necessarily for describing relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other orientations than described or illustrated herein.

It is to be noticed that the term "comprising", used in the claims, should not be interpreted as being restricted to the means listed thereafter; it does not exclude other elements or steps. It is thus to be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, or groups thereof. Thus, the scope of the expression "a device comprising means A and B" should not be limited to devices consisting only of components A and B. II means that with respect to the present invention, the only relevant components of the device are A and B. Similarly, it is to be noticed that the term "connected", used in the description, should not be interpreted as being restricted to direct connections only.

Thus, the scope of the expression "a device A connected to a device B" should not be limited to devices or systems wherein an output of device A is directly connected to an input of device B. It means that there exists a path between an output of A and an input of B which may be a path including other devices or means.

"Connected" may mean that two or more elements are either in direct physical or electrical contact, or that two or more elements are not in direct contact with each other but yet still co-operate or interact with each other.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment, but may refer to different embodiments.

Furthermore, the particular features, structures or characteristics may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this

disclosure, in one or more embodiments.

Similarly it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Furthermore, while some embodiments described herein include some but not other features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention, and form different embodiments, as would be understood by those skilled in the art. For example, in the following claims, any of the claimed embodiments can be used in any combination.

Furthermore, some of the embodiments are described herein as a method or combination of elements of a method that can be implemented by a processor of a computer system or by other means of carrying out the function. Thus, a processor with the necessary instructions for carrying out such a method or element of a method forms a means for carrying out the method or element of a method.

Furthermore, an element described herein of an apparatus embodiment is an example of a means for carrying out the function performed by the element for the purpose of carrying out the invention.

In the description provided herein, numerous specific details are set forth.

However, it is understood that embodiments of the invention may be practised without these specific details. In other instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an

understanding of this description.

The invention will now be described by a detailed description of several embodiments of the invention. It is clear that other embodiments of the invention can be configured according to the knowledge of persons skilled in the art without departing from the true spirit or technical teaching of the invention, the invention being hmited only by the terms of the appended claims.

Part of a solar collector 10 is shown in Figure 1. It comprises a tube 15. The tube may be fabricated from metal although other materials are contemplated. The tube 10 is shown in plan looking substantially along the principal axes of the lenses.

Arranged around the inside of the tube 15 are eight biconvex lenses 20. These are arranged such that the principal axes of the lenses is substantially parallel to the longitudinal length of the tube 15. Additionally an optional ninth lens 30 is arranged in the centre of the arrangement of the eight aforementioned lenses. The lenses have a diameter of 200 mm although other si2es are contemplated. Suitable fixings (not shown) for maintaining the lenses in position in the tube are provided.

In Figure 2 an elevational cross-sectional view of the solar collector 10 is shown. The tube 15 comprising the lenses 20,30 is uppermost. Telescopically associated to the tube 15 is another tube 40. This tube 40 has a sllghtly larger diameter so that it fits around the outer perimeter of the first tube 15. However, the second tube 40 could have a sllghtly smaller diameter than the first tube 15 so that it fits inside the first tube 15. The two tubes 15,40 have concurrent longitudinal axes.

The second, lower, tube 40 has a lens arrangement 50 for focusing the llght which is directed onto it from the arrangement of biconvex lenses 20,30. The llght is focused such that it produces a substantially narrow beam of llght. The lens arrangement 50 may be one or more achromatic doublet lenses.

The two tubes 15,40 may be moved telescopically relative to one another by means of an arrangement of pistons or rams 60 located radially outwardly of the tubes. These rams may be controlled by a controller or manually. The rams may be pneumatic or hydraulic.

The tubes 15,40 may be "aimed" at the sun such that incident sunlight falls on the biconvex lenses 20,30. The tubes 15,40 may also track the sun through the sky.

This aiming and tracking may be achieved by means of rotation of the collector in two axes; a first axis perpendicular to the hori2ontal, and a second axis "A" parallel to the hori2ontal. The means for rotation about axis "A" is indicated "70" in Figure 2. The means for rotation about the other axis are not shown.

In Figure 3 the solar collector 10 is shown in combination with a heat exchanger 80. This is dome shape having a support axle 90, having an axis "B", about which the dome part may rotate. The axle 90 is supported on a base.

In use, sunlight enters the first tube 15 via the hiconvex lenses 20,30. These lenses focus and direct tile light onto the second lens arrangement 50. This second lens arrangement 50 focuses and directs the light 140 onto the heat exchanger 80.

The heat exchanger 80 is shown in more detail in Figure 4. The heat exchanger comprises a central core 130 surrounded by plates 110. Spaces 100 are maintained between the plates 110. Each plate 110 has perforations 120 arranged within it. The plates 110 and spaces 100 between them are arranged at an angle from the vertical central core such that, with the tubes 13,40 at a particular angle to the hori2ontal, the light beam 140 directed by the lens arrangement 50 enters between the plates and falls upon the central core 130. However, with the tubes 15,40 at other angles to the hori2ontal the light beam 140 will strike the plates 110 or may pass through some of the perforations 120 and strike the central core 130.

As the light 140 strikes the plates 110 and/or the central core 130 the heat exchanger 80 will be heated.

In use, air, or another medium such as water, is caused to flow across the heat exchanger and through the perforations cooling the heat exchanger and transferring heat away from it. This heated fluid may be used thereafter for heating water in a steam turbine for electricity generation. Alternatively, or additionally, the heated fluid may be used for heating water for space heating and/or domestic hot water heating.

In another embodiment, the heat exchanger 80 is replaced with a heat store 150 comprising black volcanic sand. This store 150 is partially buried such that its upper surface is flush with the surrounding ground surface 170. Through the sand one or more pipes 160 are located. The pipes 160 carry fluid which transfer heat from the sand away to further facilities for onward use. This heated fluid may be used thereafter for heating water in a steam turbine for electricity generation.

Alternatively, or additionally, the heated fluid may be used for heating water for space heating and/or domestic hot water heating.

Claims (12)

  1. Claims 1. A sunlight collector comprising one or more biconvex lenses and one or more achromatic doublet lenses for focusing incident sunlight, wherein the position of the one or more biconvex lenses is adjustable in relation to the one or more achromatic doublet lenses.
  2. 2. The sunlight collector according to claim 1, comprising two tubes, one held telescopically within the other, wherein the one or more biconvex lenses are held in one tube and the one or more achromatic doublet lenses are held in the other tube.
  3. 3. The sunlight collector according to claim 3, further comprising means for adjustably moving one tube relative to the other tube along the longitudinal axes of the tubes.
  4. 4. The sunlight collector according to any preceding claim, further comprising means for moving tile collector so that it tracks the progress of the sun through the sky.
  5. 5. The sunlight collector according to any preceding claim, further comprising a heat exchanger, onto which the resultant focused sunlight is directed for heating of the heat exchanger, the heat exchanger comprising an array of plates at least some of which are perforated.
  6. 6. The sunlight collector according to claim 5, wherein the plates are cast iron.
  7. 7. The sunlight collector according to either of claims S and 6, further comprising means for transferring the heat stored in the heat exchanger for utilisation of the heat.
  8. 8. The sunlight collector according to claim 7, wherein the means for transferring the heat is a current of air.
  9. 9. The sunlight collector according to any preceding claim, wherein the arrangement of lenses collects and focuses sunlight in both the visible and ultraviolet ranges of the electromagnetic spectrum.
  10. 10. The sunlight collector according to any of claims I to 4, further comprising a heat store upon which the focused sunlight may be directed.
  11. 11. The sunlight coliector according to claim 10, wherein the heat store comprises black volcanic sand and one or more pipes buried within the sand, the one or more pipes for carrying fluid for transferring heat away from the sand for utilisation thereafter.
  12. 12. A sunlight collector substantially as hereinbefore described with reference to the accompanying drawings.
GB0813564A 2008-07-24 2008-07-24 Solar collector comprising lenses Withdrawn GB2462107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0813564A GB2462107A (en) 2008-07-24 2008-07-24 Solar collector comprising lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0813564A GB2462107A (en) 2008-07-24 2008-07-24 Solar collector comprising lenses

Publications (2)

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GB0813564D0 GB0813564D0 (en) 2008-09-03
GB2462107A true GB2462107A (en) 2010-01-27

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Family Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3236307A4 (en) * 2014-12-19 2018-09-26 Esteves Palmeira, André Luiz Electromagnetic and solar energy concentrator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189717843A (en) * 1897-03-19 1898-08-29 Soc An Improved Terrestrial Ocular or Eye-piece.
US4057048A (en) * 1975-11-12 1977-11-08 Maineline Sales Co., Inc. Solar heat collector
US4213303A (en) * 1978-04-21 1980-07-22 Lane William E Sun tracking solar energy boiler
JPS55102858A (en) * 1979-01-31 1980-08-06 Masao Yoshimura Solar spectrum follow-up heat collecting device
US4612488A (en) * 1984-06-20 1986-09-16 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Apparatus for controlling the directional orientation of a radiation receiver device to a light source
US5927272A (en) * 1998-07-15 1999-07-27 Robertson; Dana R. Combination solar powered cigarette lighter and telescope

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189717843A (en) * 1897-03-19 1898-08-29 Soc An Improved Terrestrial Ocular or Eye-piece.
US4057048A (en) * 1975-11-12 1977-11-08 Maineline Sales Co., Inc. Solar heat collector
US4213303A (en) * 1978-04-21 1980-07-22 Lane William E Sun tracking solar energy boiler
JPS55102858A (en) * 1979-01-31 1980-08-06 Masao Yoshimura Solar spectrum follow-up heat collecting device
US4612488A (en) * 1984-06-20 1986-09-16 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Apparatus for controlling the directional orientation of a radiation receiver device to a light source
US5927272A (en) * 1998-07-15 1999-07-27 Robertson; Dana R. Combination solar powered cigarette lighter and telescope

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3236307A4 (en) * 2014-12-19 2018-09-26 Esteves Palmeira, André Luiz Electromagnetic and solar energy concentrator

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Publication number Publication date
GB0813564D0 (en) 2008-09-03

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