EP1313926A1 - Ensemble de construction solaire pourvu d'une couche isolante continue - Google Patents

Ensemble de construction solaire pourvu d'une couche isolante continue

Info

Publication number
EP1313926A1
EP1313926A1 EP00957831A EP00957831A EP1313926A1 EP 1313926 A1 EP1313926 A1 EP 1313926A1 EP 00957831 A EP00957831 A EP 00957831A EP 00957831 A EP00957831 A EP 00957831A EP 1313926 A1 EP1313926 A1 EP 1313926A1
Authority
EP
European Patent Office
Prior art keywords
insulation layer
assembly according
base
module
building
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Withdrawn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
EP00957831A
Other languages
German (de)
English (en)
Inventor
Thomas L. Dinwoodie
Adam D. Jackaway
Timothy M. Mueller
Daniel S. Shugar
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.)
SunPower Corp Systems
Original Assignee
PowerLight Corp
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 PowerLight Corp filed Critical PowerLight Corp
Publication of EP1313926A1 publication Critical patent/EP1313926A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00—Supporting structures for PV modules
    • H02S20/20—Supporting structures directly fixed to an immovable object
    • H02S20/22—Supporting structures directly fixed to an immovable object specially adapted for buildings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/052—Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells
    • H01L31/0521—Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells using a gaseous or a liquid coolant, e.g. air flow ventilation, water circulation
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • 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
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • This invention relates generally to photovoltaic (PV) building assemblies, and in particular to an assembly which provides for photovoltaic power generation, thermal insulation and waterproofing in a simple, lightweight and cost-efficient construction assembly.
  • PV photovoltaic
  • the present invention is directed to a photovoltaic building assembly which not only provides for photovoltaic electricity generation but also provides thermal insulation and waterproofing for the building in a lightweight, cost-effective construction assembly.
  • the photovoltaic building assembly includes a building support surface on which a pattern of PV module support assemblies are arranged. Each support assembly has a base, adjacent to the building surface, and an outwardly extending portion. A continuous insulation layer, preferably a sprayed-on foam insulation layer, is applied to cover the building surface and the bases. A PV module is mounted to and is supported by the outwardly extending portion above the insulation layer.
  • the outer surface of the insulation layer preferably has a weatherproof coating preventing moisture from reaching the building surface.
  • the base can be secured to the building support surface, typically a roof or a wall, in a variety of ways.
  • the base can be affixed to the building support surface by an adhesive or through the use of mechanical fasteners which may, or may not, penetrate the support surface.
  • the base may be sized so that embedding the base within the insulation layer is all which is needed to secure the PV module support assembly to the building support surface.
  • the PV module support assembly is preferably constructed so that an air cavity is formed between the continuous insulation layer and the PV module to provide for air cooling of the PV module.
  • thermal conduits can be mounted adjacent to the underside of the PV modules to remove excess heat from, or supply heat to, the PV modules when the system is used as a hybrid PV/thermal system.
  • the invention is useful in both new construction and retrofit applications; in either case the invention can be used as the sole roof waterproofing membrane or as a supplemental waterproofing mechanism covering a conventional waterproofing membrane.
  • the invention has the ability to provide roof leveling or roof sloping, such as where roof sagging has thwarted intended drainage courses. Also, because the PV module is typically spaced-apart above the continuous insulation layer, the PV modules can span low-lying roof penetrations and obstructions. The invention can thus reduce the cost of conventional building materials and their installation by displacing the need for conventional waterproofing membranes, while enhancing the value of the constructed building. The resulting structure also provides social benefits by reducing fuel consumption thus contributing to reduction in air pollution and global warming. Other features and advantages of the invention will appear from the following description in which the preferred embodiments have been set forth in detail in conjunction with the company drawings.
  • FIG. 1 is a simplified side cross-sectional view of a building showing PV building assemblies in both roofing and cladding configurations;
  • Fig. 2 is a simplified plan view showing the roof of the building of Fig. 1 and an array of photovoltaic modules;
  • Fig. 3 is a side cross-sectional view taken along line 3-3 of Fig. 2;
  • Fig. 4 is a view similar to that of Fig. 3, but of an embodiment where the air cavity between the continuous insulation layer and the PV module is substantially eliminated;
  • Fig. 5 shows the use of a hollow perimeter unit adjacent to the outer edge of a PV module
  • Fig. 5 a is a view similar to Fig. 5 but using alternative embodiments of the PV module support assembly and hollow perimeter unit of Fig. 5;
  • Fig. 5b is an enlarged overall view of the hold-down and base of the PV module support assembly of Fig. 5a;
  • Fig. 6 is a view similar to that of Fig. 3, but using the PV module support assemblies of Fig. 5a showing an embodiment with sloped PV modules;
  • Fig. 6a is an enlarged perspective view of the body and stand-off of Fig. 6 illustrating vent holes in the portion of the body not covered by a PV module;
  • Fig. 7 is an enlarged view illustrating a footer or base loose-laid on a roofing surface, the footer or base relying on its weight to help secure the assembly to the building surface;
  • Fig. 8 illustrates adhering the base to the building surface with an adhesive
  • Fig. 9 illustrates the use of a mechanical fastener to secure the base to the roofing surface, the fastener penetrating the roofing surface;
  • Fig. 10 illustrates the use of a porous base embedded within the foam, the foam penetrating through the pores to adhere directly to the building surface;
  • Fig. 11 illustrates the use of a radiant barrier adjacent to the weather- resistant layer
  • Fig. 12 illustrates the use of thermal conduits adjacent to the underside of the PV modules for heat transfer between a fluid in the thermal conduits and the PV module;
  • Fig. 13 illustrates electrical wiring embedded in a conduit within the continuous insulation layer
  • Fig. 14 illustrates the use of forced air ventilation of the air cavity between the PV module and the insulation layer for heat transfer from the PV building assembly to a heat collector system.
  • Fig. 1 illustrates a photovoltaic (PV) building assembly 2 mounted to the roof 4 and side 6 of a building 8.
  • PV building assembly 2 includes an array of PV modules 10.
  • Each PV module 10 typically includes one or more PV cells mounted to a support substrate.
  • Fig. 2 illustrates an array of 18 PV modules 10 mounted to roof 4.
  • roof 4 is illustrated as a flat roof. However, roof 4 could also be a sloped roof.
  • Side 6 is illustrated as being vertical; it could be other than vertical as well.
  • PV building assemblies 2 can be substantially the same, whether they are mounted on a roof 4 or a side 6.
  • Fig. 3 provides an enlarged cross-sectional view of a first embodiment of a PV building assembly 2 made according to the invention.
  • Assembly 2 includes a plurality of PV module support assemblies 12 which support PV modules 10 above roof 4.
  • Each support assembly 12 includes a body 14, to which PV modules 10 are secured, legs 16, which support body 14, and bases 18.
  • PV modules 10 are secured to body 14 using a variety of techniques including adhesives, clips, threaded fasteners, clamps, rivets, etc.
  • the distal ends 20 of legs 16 are secured to bases 18; in the preferred embodiment body 14, leg 16 and base 18 are a unitary part made of metal such as aluminum, galvanized steel, concrete, composite materials, fiberglass or plastics.
  • Base 18 is embedded within a continuous insulation layer 22, typically polyurethane foam applied to roof 4 by spraying.
  • a small space is shown to exist between insulation layer 22 and roof 4 and between base 18 and roof 4 for purposes of illustration.
  • base 18, in the embodiment of Fig. 3, rests against roof 4 and insulation layer 22 contacts and adheres to roof 4 as well.
  • the act of embedding base 18 within insulation layer 22 may provide all the hold-down force required to secure support assembly 12 to roof 4. This will be discussed in more detail with reference to Fig. 7. However, as will be discussed with reference to Figs. 8-10, additional securement of support assembly 12 to roof 4 and side 6 may be used.
  • weather-resistant layer 24 typically made of an elastomeric or acrylic coating such as FLEXGuard manufactured by Gers International.
  • Weather-resistant layer 24 is typically applied as a liquid or semi-liquid onto the outer surface of insulation layer 22 to ensure a water-tight surface for the assembly. Again, weather-resistant layer 24 is shown with an air gap between it and insulation layer 22 for purposes of illustration.
  • PV modules 10 are shown with gaps 26 between the modules which provide for air venting from air cavities 28 created between modules 10 and insulation layer 22.
  • Use of air cavity 28 helps to facilitate air pressure equalization between the top and bottom of PV module 10, thus reducing forces of wind uplift.
  • Gaps 26 also permit water to drain away from PV module 10 onto weather-resistant layer 24, where the water can be drained away from roof 4.
  • Fig. 4 illustrates a PV building assembly 2a similar to that of Fig. 2 but wherein air cavity 28 is eliminated. This embodiment may be useful when cooling of the lower surface of PV modules 10 is not needed, such as with amorphous silicon PV material, or where a decrease in PV efficiency is acceptable.
  • Fig. 5 illustrates PV building assembly 2 together with a perimeter unit 30.
  • Perimeter unit 30 is shown as a formed metal perimeter unit with the top portion secured to body 14 of assembly 12, typically using, for example, an adhesive, a threaded fastener or a clip.
  • Perimeter unit 30 may alternately be constructed of, for example, foam, plastic, or other materials.
  • the hollow perimeter unit 30 can be used to house various wires and conduits.
  • Perimeter unit 30 could be configured to provide a walkway about the perimeter of an array of PV modules 10.
  • Perimeter unit 30 may be fastened to roof 4 using an adhesive to secure unit 30 to layers 22, 24, with roof penetrations or loose laid. Conventional, relatively heavy pavers could be used along the perimeter of an array of PV modules 10, the weight of the pavers maintaining the pavers in position.
  • perimeter unit 30 could be embedded within insulation layer 22.
  • Fig. 5 a illustrates an alternative embodiment of the assembly of Fig. 5.
  • support assembly 12 can be thought of as comprising a lower portion (that is base 18) and an upper portion (that is body 14 and legs 16).
  • assembly 12a also comprises a lower portion (base 18a, see Fig. 5b) and an upper, outwardly-extending portion (body 14a, an L-shaped stand-off 31, and a hold-down 33).
  • Stand-off 31 is preferably a continuous extension of body 14a.
  • hold-down 33 comprises an extension 35 and a pair of resilient keepers 39.
  • Keepers 39 will flex inwardly to permit the combination of PV module 10, body 14a and stand-offs 31 to deflect keepers 39 downwardly when snapped into place.
  • hold-down 33 could be constructed to engage stand-offs 31 and perimeter units 30a at their lower ends adjacent layer 24.
  • Fig. 6 illustrates a further embodiment of the invention.
  • PV building assembly 2c includes PV modules 10 sloped to change their relative inclination to the sun and to modify the wind forces on assembly 2c.
  • Fig. 6a illustrates a perspective view of a portion of body portions 14b, 14c and stand-offs 31 of Fig. 6, showing the outer surface of body portion 14c which serves as wind deflector.
  • Body portion 14c may be perforated to, as shown, allow ventilation of air cavity 28a. Please see Dinwoodie U.S. Patent Nos. 5,316,592 and 5,505,788 and 5,746,839.
  • Fig. 7 illustrates base 18 loose-laid on roof 4.
  • PV building assembly 2 relies on the adhesion of insulation layer 22 to roof 4 and the fact that base 18 is large enough that it would not pull out of the insulation layer to keep PV building assembly mounted to roof 4. Also, base 18 could be made heavy enough to make a significant contribution to maintaining assembly 2 mounted to roof 4.
  • Fig. 8 illustrates the use of a mastic or other adhesive 32 between base 18 and roof 4 to adhere base 18, and thus PV module support assembly 12, to the roof.
  • Fig. 9 illustrates the use of a roof-penetrating bolt 34 to secure base 18 and thus support assembly 12 to the roof. Mechanical fasteners which do not penetrate roof 4 could also be used in lieu of bolt 34.
  • a base 18b is used.
  • Base 18b is a porous base having a number of through-holes 36 through which sprayed-on insulation layer 22 can pass so that the insulation passing through through-holes 36 can bond to roof 4 to help secure base 18a to roof 4.
  • Fig. 11 illustrates a PV building assembly similar to the roofing assembly of Fig. 3, but including a radiant barrier 37 mounted beneath PV module 10 and against layer 24. Radiant barrier 37 is used to help reduce the transfer of radiant heat to roof 4.
  • Typical radiant barriers can include sheet or foil aluminum, galvanized steel, metallic foils, metallized plastic film metallized coatings, or other coating over the foam layer.
  • Radiant barrier 37 can be applied to the back of PV module 10 so that, in such case, radiant barrier 37 is a part of PV module 10.
  • a suitable PV module 10, with or without a radiant barrier 37, can be obtained from PowerLight Corporation, Berkeley, California.
  • Fig. 12 illustrates a further embodiment of the invention in which a PV building assembly is made using an array of thermal energy collecting conduits 38 situated directly beneath and in thermal contact with PV modules 10.
  • the use of conduits 38 permits thermal energy to be conducted away from or to PV modules 10.
  • the heat transfer fluid can be directed to and from conduits 38 through a conduit 40 embedded within insulation layer 22.
  • the use of conduits 38 helps keep PV modules 10 from overheating by transferring heat away from the modules. Also, in certain situations it may be desired to heat PV modules 10 to, for example, melt standing snow off their top surfaces to facilitate electricity collection.
  • Fig. 13 illustrates electrical wiring 42 running through an electrical conduit 44 embedded within insulation layer 22. Embedding the electrical conduit 44 in the insulation layer 22 serves as a thermal and UV protection for said wiring.
  • the electrical conduit 44 can be either rigid metal conduit, plastic conduit, plastic sheathing, or other.
  • the electrical energy from wiring 42 can be used to, for example, charge batteries or transformed into alternating current for delivery to a power grid.
  • Fig. 14 illustrates a further embodiment of the invention in which a fan 48 is installed to force air through air cavity 28, thereby reducing the operating temperature of the PV modules and collecting heat for use within the building.
  • This heat may be used to meet thermal energy needs of various building systems such as building conditioning services, hot water supply systems, or manufacturing process systems.
  • bases 18 of support assemblies 12 are positioned on a building surface, such as roof 4, at the desired locations according to the layout of the array of PV modules.
  • Bases 18 are commonly secured to roof 4 or side 6 as discussed with reference to Figs. 7-10.
  • Legs 16 extend upwardly from base 18.
  • Conduits 40, 44, if used, are positioned on bases 18.
  • the base portions 46 of perimeter units 30 are located to surround the array of PV modules 10.
  • Thermal insulation layer 22 is preferably a foam insulation layer having an insulating value (R value) of about 3 to 7 per inch (3-7 hr/BTU ft2 DF per inch thickness).
  • Insulation layer 22 is typically formed by spraying on a layer of polyurethane foam to a thickness of about 1/2" to 3" to achieve thermal insulation of about R-2 to R-21.
  • Weather-resistant layer 24 is then applied to the upper surface of insulation layer 22 for a good water-tight seal to the insulation layer.
  • PV modules 10 are then mounted to bodies 14, typically using adhesives, clips, or other quick-connecting fasteners.
  • PV module support assemblies 12a see Figs. 5a-14
  • support assemlbies 12 see Figs.
  • each body 14a, with a PV module 10 mounted thereto, is secured between the upstanding hold-downs by temporarily deflecting keepers 39 downwardly until the base of L-shaped stand-off 31 lies adjacent to layer 24, at which time keepers 39 snap back into the position illustrated in the figures. Appropriate electrical and thermal connections are then made through conduits 40, 44.
  • Legs 16 and hold-downs 33 can be made of a variety of materials including metal, plastic or other structural materials.
  • Bodies 14 can be integral with legs 16 or can be attached to the upper ends of leg 16 with snap-on clip/pin connections made of metal, plastic or other appropriate structural materials.
  • Bases 18 can be made of concrete pavers, foam-backed roofing pavers, sheet metal, plywood, or other structural materials. When bases 18 are made of heavy materials, this helps to counteract wind- induced uplift and sliding forces by virtue of their weight alone. However, by being embedded within insulation layer 22, and also by being fastened to the building surface, such as using an adhesive or mechanical fasteners, additional stability and mounting strength is achieved.
  • Insulation layer 22 and weather-resistant coating 24 may constitute the only building surface water-proofing membrane. Alternatively, insulation layer 22 and weather-resistant coating 24 may provide an additional waterproofing mechanism over a typical building membrane. Layer 24 may include a radiant barrier material coating.
  • PV building assembly 2 preferably has a weight of only about 1 to 4 pounds per square foot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
  • Building Environments (AREA)

Abstract

L'invention concerne un ensemble de construction solaire (2) comportant une surface de support de construction, généralement un toit (4) ou une paroi (6), sur lequel est monté un ensemble de support de module solaire (12). Ledit ensemble de support comporte une base (18) fixée à la surface de support et une partie supérieure (14, 16; 14a, 31, 33). Un module solaire (10) est monté sur le corps (14, 14a) de la partie supérieure et supporté par ce dernier. Une couche isolante en mousse (22) est pulvérisée sur la surface de support afin d'y encastrer la base et les extrémités inférieures des pieds. Une couche résistante aux intempéries (24) est appliquée sur la surface extérieure de la couche isolante afin d'empêcher l'humidité d'atteindre la surface du bâtiment. Ladite base peut être fixée sur la surface de support de construction au moyen d'un adhésif (32) ou de dispositifs de fixation mécaniques (34) ainsi que par simple encastrage de ladite base dans la couche isolante. Ledit ensemble permet de générer de l'électricité, d'isoler thermiquement le bâtiment et de rendre ce dernier étanche tout en donnant un ensemble de construction léger.
EP00957831A 2000-08-24 2000-08-24 Ensemble de construction solaire pourvu d'une couche isolante continue Withdrawn EP1313926A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/023443 WO2002016707A1 (fr) 2000-08-24 2000-08-24 Ensemble de construction solaire pourvu d'une couche isolante continue

Publications (1)

Publication Number Publication Date
EP1313926A1 true EP1313926A1 (fr) 2003-05-28

Family

ID=21741712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00957831A Withdrawn EP1313926A1 (fr) 2000-08-24 2000-08-24 Ensemble de construction solaire pourvu d'une couche isolante continue

Country Status (3)

Country Link
EP (1) EP1313926A1 (fr)
AU (1) AU2000269395A1 (fr)
WO (1) WO2002016707A1 (fr)

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Also Published As

Publication number Publication date
AU2000269395A1 (en) 2002-03-04
WO2002016707A1 (fr) 2002-02-28

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