FR2974244A1 - Device for covering and cooling photovoltaic panel that is utilized in roof of building, has circulating unit for circulating laminar flow of air in space that is created between upper surface of panel and lower surface of plate - Google Patents

Device for covering and cooling photovoltaic panel that is utilized in roof of building, has circulating unit for circulating laminar flow of air in space that is created between upper surface of panel and lower surface of plate Download PDF

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Publication number
FR2974244A1
FR2974244A1 FR1153279A FR1153279A FR2974244A1 FR 2974244 A1 FR2974244 A1 FR 2974244A1 FR 1153279 A FR1153279 A FR 1153279A FR 1153279 A FR1153279 A FR 1153279A FR 2974244 A1 FR2974244 A1 FR 2974244A1
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FR
France
Prior art keywords
panel
element
air
means
upper face
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.)
Pending
Application number
FR1153279A
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French (fr)
Inventor
Patrice Canet
Jose Delpeyrou
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INTEGRASOL
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INTEGRASOL
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Publication date
Application filed by INTEGRASOL filed Critical INTEGRASOL
Priority to FR1153279A priority Critical patent/FR2974244A1/en
Publication of FR2974244A1 publication Critical patent/FR2974244A1/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/052Cooling 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
    • H01L31/0521Cooling 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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/048Encapsulation of modules
    • 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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/10Photovoltaic [PV]
    • Y02B10/12Roof systems for PV cells
    • 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
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The present invention relates to a device for covering and cooling at least one photovoltaic panel (1), characterized in that it consists of cover means (3) of the upper face (2) of said panel (1) formed, on the one hand, of at least one plate-shaped element (4) of translucent material and, on the other hand, support means (5) of each element on said upper face (2) of said panel (1), so as to raise said element relative to said upper face (2), and in that it comprises means (9) for circulating a laminar flow of air in the space (6). ) created by said support means (5) between said upper face (2) and the lower face (7) of each element.

Description

The present invention is in the field of the implementation of solar photovoltaic panels capturing and converting solar radiation into electricity. The invention relates more particularly to photovoltaic panel cooling. In known manner, a photovoltaic solar capture panel consists of a matrix of cells that convert solar radiation into a continuous current by internal photoelectric effect. However, this operating principle is conditioned by an increase in temperature of the materials constituting said cells. However, this rise in temperature also causes a decrease in cell efficiency. In sum, a radiant heating temperature too high, decreases the amount of electrical energy produced. This decrease is expressed as a percentage per degree of temperature, around the normal operating temperature of the cell (NOCT for "Normal Operating Cell Temperature"). Therefore, on average, there is a loss of efficiency of more than 10% of the installations, due to a temperature approaching 60 degrees Celsius (60 ° C). This is why it has been imagined to cool the photovoltaic panels in order, on the one hand, to improve their efficiency and, on the other hand and in a related manner, to recover the heat produced, in particular for additional heating. To do this, the existing solutions envisaged consist in circulating a fluid under the photovoltaic panel, in contact with its lower face. The fluid used is generally air, conveyed within an underlying circuit for a fan. However, the heat exchange with the lower face, made of material, remains low and does not sufficiently lower the temperature of the panel on the upper face undergoing solar radiation. In addition, the implementation of an underlying ventilation circuit requires to consider at the time of installation of the panels, or to take over the entire structure, complex and expensive operation. The invention aims to overcome the drawbacks of the state of the art by proposing to directly cool the upper face of a photovoltaic panel by circulating a laminar air flow. To do this, the invention relates to a device for covering and cooling at least one photovoltaic panel. Such a device consists of means for covering the upper face of said panel formed, on the one hand, of at least one element in the form of a translucent material plate and, on the other hand, of support means for each element. on said upper face of said panel, so as to raise said element relative to said upper face, and in that it comprises means for circulating a laminar flow of air in the space created by said means of support between said upper face of said panel and the lower face of each element. Therefore, contrary to what would be appreciated by those skilled in the art, not wanting to limit the radiation perceived by the panel, the invention provides for covering the upper face of each photovoltaic panel so as to provide a circulation space air. The cover element is hermetically sealed and translucent, so as to let the solar radiation pass. Such covering is performed so as to constitute a space for the circulation of an air gap between the upper face of said panel and the covering element. Other characteristics and advantages of the invention will emerge from the following detailed description of non-limiting embodiments of the invention, with reference to the appended figures in which: FIG. 1 represents an exploded perspective view of a device according to the invention intended to be secured on two photovoltaic panels; and FIG. 2 represents a perspective view of these two panels, once covered by said device, with arrows modeling the laminar flow of air flow between the surface of the panels and the device. The present invention relates to the cooling of the surface of at least one photovoltaic panel 1, in particular several panels juxtaposed so as to form a solar radiation capture module for the production of electrical energy. Advantageously, the invention provides for covering the upper face 2 of at least one photovoltaic panel 1 and for circulating a flow of air between this cover and said panel 1, with a view to cooling its upper face 2. Thus, a such cooling makes it possible to maintain a low temperature which improves the electricity production efficiency of the cells composing said panel 1, which can reach a gain of 10 to 20%. To this end, the invention relates to a device for covering and cooling at least one photovoltaic panel 1.

Such a device consists of means 3 for covering the upper face 2 of said panel 1. On the one hand, such means 3 are formed of at least one element in the form of a plate 4. Such a plate is composed of translucent material , in order to let the solar radiation pass as much as possible. In particular according to a preferred embodiment, said plate 4 is provided flat. It may be made of a plastic or composite material, such as polymethyl methacrylate (PMMA) whose transparency properties allow 97% of incident light or polyethylene to pass through. According to a specific embodiment, said plate 4 may be treated or made of a specific material, so as to filter a part of the solar radiation or to modify the incidence thereof, in particular by means of an internal structure or a surface having the effect of a prism. Such a plate can also be rigid, with little or no deformation along its length, because of its weight when positioned horizontally. In addition, said plate 4 can be dimensioned so as to cover integrally, in one piece, the upper face 2 of the panel 1. Such a plate 4 then has a rectangular shape with a width and a length equivalent to that of said panel 1. According to another embodiment, several plates 4 can be used to cover the surface of the same panel 1.

On the other hand, the device according to the invention comprises means 5 of support of each element on said upper face 2 of said panel 1. These support means 5 allow to elevate said element with respect to said upper face 2. This raising is carried out by several millimeters and creates a space 6 between the lower face 7 of each element (in fact the lower face of each plate 4) and the upper face 2 of said panel 1. According to the preferred embodiment, said means 5 support are in the form of studs 8 of 20 enhancement. Such studs 8 are positioned on the surface of the panel 1, so as to support the weight of said plate 4. In particular, said studs 8 may be distributed at regular intervals on the lower face 7 of the element and therefore of each plate 4 It will be noted that, during the installation of the device on a panel 1, to facilitate the installation, the pads are arranged at the upper face 2, then each plate 4 is positioned in abutment on these pads 8. According to a particular embodiment, said pads 8 30 are made of a material with properties for absorbing and recovering the differences in expansion between the upper face 2 and the plate 4. Thus, said pads 8 may be made of an elastic material, such as ethylene-propylene-diene monomer (EPDM). According to a preferred embodiment, each stud 8 has adhesive upper and lower faces. Thus, the studs can be fixed on the upper face 2 of the panel 1 and make integral the plate 4 during its installation, ensuring the mechanical strength of said plate 4. It is therefore necessary to position a number of sticky pads 8 sufficient to ensure the integration of each plate 4 with its underlying panel 1, preventing any risk of tearing especially in case of strong wind or violent. Advantageously, the space 6 thus created will serve for the circulation of a cooling fluid, such as air. The small thickness of said space 6 allows the fluid to circulate rapidly along the panel 1, in the form of air slats. To do this, the device comprises means 9 for circulating a laminar flow of air in the space 6 created by said support means 5 between said upper face 2 of said panel 1 and the lower face 7 of each element. More particularly, said circulation means 9 are in the form of a longitudinally shaped blower outlet 10 comprising an inlet 11 for supplying air and at least one outlet 12 for blowing a flow of air at a first end 13 of said space 6. It will be noted that said inlet 11 can be directly connected to the outside, suction the ambient air, but can also be connected to an air supply network originating, in particular, from the inside. of a building, for example through a Mechanical Powered Ventilation (VMC) or a heating system by ventilation or air conditioning type reversible. In this case, the air can be removed from the building and heated in contact with the panels 1, before being reintroduced. To do this, the device comprises suction means 14 in the form of a mouth 15 for taking up the laminar flow of air at the opposite end 16 of said space 6. Such a recovery mouth 15 may be identical to the blower mouth 10, namely that it has an inlet 150 and a kind 151. Thus, the air flows in a closed circuit.

According to the preferred embodiment, shown in the figures, the blow-out and return openings 15 are in the form of a hollow tube and are intended to be positioned along the end edges of a panel 1. More particularly, the tube has at least one plane face 17 through which are formed openings constituting the outlet 12 of blowing. This flat face 17 is positioned at the end edges of the panel 1, facing the inside of the latter.

According to the implantation shown in FIGS. 1 and 2, said covering means 3 comprise a first and at least a second element which reciprocally overlaps two juxtaposed panels. Note that in this configuration, said panels are juxtaposed end to end, but according to another embodiment, they can be contiguous at their longitudinal edge. In addition, according to the figures, the panels can be located at a roof, in the direction of the slope or crawling. According to other possible configurations, said panels may be abutting facade or on a supporting structure, particularly in the context of a field implantation. According to the configurations, the air is blown from top to bottom, said blower outlet 10 being at the top end and the outlet opening 15 at the bottom, but they can also be reversed, the air being blown from the bottom up, following the natural ascending effect of the air as it warms.

In all these configurations, said device comprises means 18 for sealing one end of said first element with the adjacent end of said second element, ensuring the continuity of the circulation spaces 6 of said first and second elements.

According to the preferred embodiment, said connecting means 18 are in the form of at least one seal 19. The latter may be in the form of a longitudinal bar from covering the edges of the adjacent plates 4. It can then have a longitudinal groove for inserting and maintaining the edge of each plate 4.

Each seal 18 can also be supported on the junction gap between the two abutting panels, the thickness of said seal 19 being greater than the height of the studs 9 and therefore the space 6. In this case, said seal 18 may be perforated transversely to allow the laminar flow of air to pass from one space 6 to another, ensuring their continuity According to particular embodiments, the seal may be made of plastic or composite material, with elastic properties to take over constraints and mechanical efforts of different materials, but also dilations. A solution envisaged may also consist in producing said seal in an expanded material, such as a foam. Other joints, not shown, can be positioned at the longitudinal edges of the elements, so as to ensure a hermetic connection between the longitudinal edges of the plates 4 and those of the panels. According to another embodiment, not shown, several panel modules 1 covered with device according to the invention can be connected end-to-end, at their blow-in inputs 11 and the respective suction outlets. In sum, vertical arrangements of columns of several panels can be interconnected at the top and bottom to form a single air blow and return circuit, said circuit being divided at each column for the cooling panels constituting it. It will be noted that the triggering of the air blowing for cooling can be carried out by controlling the atmospheric temperature and at the level of the upper face 2 of the panels, but also as a function of the sunshine or the climatic conditions, such as the speed the wind.

Thus, by covering a panel 1 with a translucent plate 4, there is a loss of efficiency of the order of 3%, with a precise material. However, the increase in efficiency due to the cooling is between 10 and 20%.

In an example of conventional implantation, for a photovoltaic panel having a loss of efficiency of 0.48% per degree Celsius, the covering by the device according to the invention gives a theoretical gain of 14.4%. Thus, the present invention makes it possible to optimize the energy efficiency of an installation of photovoltaic panels by cooling the upper face of said panels. In addition, the cover according to the invention provides additional protection against bad weather, in particular hail drop.

Claims (7)

  1. REVENDICATIONS1. Device for covering and cooling at least one photovoltaic panel (1), characterized in that it consists of cover means (3) of the upper face (2) of said panel (1) formed of a of at least one plate-shaped element (4) of translucent material and, secondly, of support means (5) for each element on said upper face (2) of said panel (1), of in order to elevate said element with respect to said upper face (2), and in that it comprises means (9) for circulating a laminar flow of air in the space (6) created by said means support (5) between said upper face (2) and the lower face (7) of each element.
  2. 2. Device according to claim 1, characterized in that said circulation means (5) are in the form of a blower mouth (10) of longitudinal shape comprising a supply inlet (11) in air and at least one outlet (12) for blowing an air flow at a first end (13) of said space (6).
  3. 3. Device according to claim 2, characterized in that it comprises suction means (14) in the form of a return port (15) of the laminar flow of air at the opposite end (16) said space (6).
  4. 4. Device according to any one of the preceding claims, characterized in that said plate (4) is flat and made of a rigid plastic or composite material.
  5. 5. Device according to any one of the preceding claims, characterized in that said support means (5) are in the form of raising studs (8) distributed at regular intervals on the lower face (7) of each element. .
  6. 6. Device according to claim 5, characterized in that each stud (8) has adhesive upper and lower faces. 9
  7. 7. Device according to any one of the preceding claims, characterized in that said covering means (3) comprise a first and at least one second elements reciprocally overlapping two juxtaposed panels and that comprises means (18). ) sealing junction of one end of said first element with the adjacent end of said second element, ensuring the continuity of the spaces (6) of circulation of said first and second elements.
FR1153279A 2011-04-15 2011-04-15 Device for covering and cooling photovoltaic panel that is utilized in roof of building, has circulating unit for circulating laminar flow of air in space that is created between upper surface of panel and lower surface of plate Pending FR2974244A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR1153279A FR2974244A1 (en) 2011-04-15 2011-04-15 Device for covering and cooling photovoltaic panel that is utilized in roof of building, has circulating unit for circulating laminar flow of air in space that is created between upper surface of panel and lower surface of plate

Applications Claiming Priority (1)

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FR1153279A FR2974244A1 (en) 2011-04-15 2011-04-15 Device for covering and cooling photovoltaic panel that is utilized in roof of building, has circulating unit for circulating laminar flow of air in space that is created between upper surface of panel and lower surface of plate

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FR2974244A1 true FR2974244A1 (en) 2012-10-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10673373B2 (en) 2016-02-12 2020-06-02 Solarcity Corporation Building integrated photovoltaic roofing assemblies and associated systems and methods

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214710A (en) * 1988-01-29 1989-09-06 Univ Open Solar collectors
DE4307705A1 (en) * 1993-02-06 1994-08-11 St Speichertechnologie Gmbh Solar cell arrangement
JPH1019388A (en) * 1996-07-03 1998-01-23 Sekisui Chem Co Ltd Hybrid type panel and building equipped with this hybrid type panel
WO2002067338A1 (en) * 2001-02-20 2002-08-29 Van Der Heijden, Franciscus, Antonius, Maria Roof structure provided with solar cells
US20030061773A1 (en) * 2001-10-01 2003-04-03 O'leary Patrick Structurally integrated solar collector
DE102007063197A1 (en) * 2007-12-19 2009-06-25 Siegfried Gutfleisch Solar cell structure, particularly for photovoltaic, for application at basic building structure, such as roof or wall, has cover plate arranged opposite to multiple carrier plates

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214710A (en) * 1988-01-29 1989-09-06 Univ Open Solar collectors
DE4307705A1 (en) * 1993-02-06 1994-08-11 St Speichertechnologie Gmbh Solar cell arrangement
JPH1019388A (en) * 1996-07-03 1998-01-23 Sekisui Chem Co Ltd Hybrid type panel and building equipped with this hybrid type panel
WO2002067338A1 (en) * 2001-02-20 2002-08-29 Van Der Heijden, Franciscus, Antonius, Maria Roof structure provided with solar cells
US20030061773A1 (en) * 2001-10-01 2003-04-03 O'leary Patrick Structurally integrated solar collector
DE102007063197A1 (en) * 2007-12-19 2009-06-25 Siegfried Gutfleisch Solar cell structure, particularly for photovoltaic, for application at basic building structure, such as roof or wall, has cover plate arranged opposite to multiple carrier plates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10673373B2 (en) 2016-02-12 2020-06-02 Solarcity Corporation Building integrated photovoltaic roofing assemblies and associated systems and methods

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