Profiles for fixing rigid plates

Inactive Publication Date: 2011-02-24
RENOLIT BELGIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rigid Si photovoltaic modules are very well known but are difficult to handle (they are heavy) and require expensive heavy frames to install them on the roof.
All these penetrations may lead to leakage and to cold bridges (leading to condensation inside the roof structure).
Moreover not all roof structures are suited to carry heavy frames, which will catch the wind (sail effect).
On a pitched roof this is also not aesthetical.
With such system, the slope of the modules (tilt angle) is anyway limited due to the wind up-lift resistance and due to shading issue (the modules are close to each other because their substrate or support must be “interlocking”; therefore modules installed with a high tilt angle will cast shadow on the modules behind).
The weight of the pavers may further be incompatible with the load bearing capacity of many commercial buildings.
Gluing operations are however quite delicate on the roof.
The (self-) adhesive may be further not compatible with the existing waterproofing membrane.
Gluing of such photovoltaic modules directly onto the waterproofing membrane will also block or at least much reduce the water vapor permeability of the waterproofing membrane, leading potentially to condensation problems inside the roof structure and/or to damages to the photovoltaic cells and/or to internal delamination of the encapsulating layers of the photovoltaic modules.
The known photovoltaic waterproofing membranes suffer from several drawbacks:Risk of formation of creases during installation because of the differential internal tensions.the modules are very easy to steal.Internal tension as a result of thermal cycli (sun-night) due to the poor matching of the coefficients of dilatation of the modules and of the polymeric films, sheets and glues.The water vapor permeability trough the sheet is partly blocked resulting into:Increased condensation into the insulation panels.Increased risk of delamination of the internal layers of the photovoltaic modules.a higher temperature of the photovoltaic module compared to an installation on a not insulated substrate. and the temperature inside the building will be increased.These membranes are difficult to install as the insulation panels have to

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  • Profiles for fixing rigid plates
  • Profiles for fixing rigid plates
  • Profiles for fixing rigid plates

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1.1

Use of Cheap Modules

[0153]The invention is of special benefit for cheap modules because of the improved installation safety, the excellent wind resistance and the increased durability and fire safety. For demonstrating the benefits two photovoltaic cells (2*0.4 m*5.4 m) are produced (and transferred) onto two plastic films (PEN), e.g. as described in WO 98 / 13882. The PEN film is called the (plastic) cell substrate. The two PEN films (0.4 m*5.4 m), with their photovoltaic active layers, are encapsulated in a laminator according to a procedure well known in the art. The PEN films are laid in parallel in the laminator with 5 cm between them. The encapsulating layers are 5 cm wider and longer at each edge than the two PEN films and cells. These layers have therefore a length of 5.5 m and a width of 0.95 m (0.05 m+0.4 m+0.05 m+0.4 m+0.05 m). The metal plate has also a size of 0.95 m*5.5 m and may be slightly corrugated in the zones without PEN films (without cell) or provided with small ...

embodiment 2

Benefit for Uni-Solar PVL 136 Modules

[0171]Two peel and stick Uni-Solar PVL 136 modules are laminated on a 1 mm AluZink® metal sheet PVDF pre-painted with pressing rolls and installed on profiles. No water from under the modules migrates towards the modules to affect them (hydrolysis reaction). Module temperature is reduced by at least 5° C. compared to the situation of comparative embodiment 1.2.

[0172]Further, it is well known that a higher temperature during exposition to weathering negatively affects the durability. Therefore, it is expected that the durability of a photovoltaic module (photovoltaic membrane) directly installed onto an insulation panel will be lower than of a photovoltaic module glued on a ventilated metallic sheet as in this invention. The literature demonstrates surprisingly high influence. In outdoor durability of PVC-Plastisols—Journal of Coatings Technology Vol 61, N° 779, December 1989, G. Inge Bäck reports a 60% increase of durability of uninsulated panels...

embodiment 3

Benefit of the Invention for Modules Mounted on Frames

[0173]A Trina Solar Module 170 is mounted like shown on FIG. 1b (tilt angle=30°): A 1.2 mm thick, 1.6 m width Alkorplan F® 35176 waterproofing membrane (10) is first mechanically fastened (611) and welded in overlap as well known in the art, on a steeldeck “106 / 250 / 3” (0.75 mm thick and 106 mm high) with Etanco EHB DF fasteners (diameter=0.48 mm-120 mm long) and Etanco 40*82 mm2″ plates. The 100 mm thick Rockwool Taurox insulation panels are fastened with the same fasteners. Three soft profiles 4 (see FIG. 2c) with inserts 23 (2 mm thick aluminium rectangle inserts—2 cm width*2.4 cm height) are then welded in parallel on the waterproofing membrane 10 along the seams between the waterproofing membrane rolls (distance between parallel soft profiles 4=1.5 m).

[0174]Two 2 mm thick 3.5 m long Aluminium (AW 6060) U profiles 2bis (base=9 cm; height=4 cm) are then attached with screws perpendicular to the 3 profiles 4 and inserts 23. The ...

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Abstract

The present invention relates to profiles for attaching rigid plates, especially photovoltaic modules, to a roof and to a method and system for attaching photovoltaic modules to a roof structure with the help of profiles.

Description

[0001]The present invention relates to profiles for attaching rigid plates, especially photovoltaic modules, to a roof and to a method and system for attaching rigid plates, especially photovoltaic modules to a roof structure.BACKGROUND OF THE INVENTION[0002]Roofs are an ideal place to install photovoltaic modules. Rigid Si photovoltaic modules are very well known but are difficult to handle (they are heavy) and require expensive heavy frames to install them on the roof.[0003]To make a.o. a commercial (i.e. essentially flat) roof watertight, it is well known to use a polymeric or a bituminous waterproofing membrane as a top layer of the roof (commercial buildings). In the case of a roof having on its top a waterproofing membrane, many penetrations of this membrane will generally be required to install the frames for the rigid Si photovoltaic modules. All these penetrations may lead to leakage and to cold bridges (leading to condensation inside the roof structure). Moreover not all r...

Claims

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Application Information

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IPC IPC(8): E04D13/18B32B37/12B32B7/08B32B37/04E04B1/38E04D13/16E04B1/70
CPCF24J2/4636Y10T156/10F24J2/5239F24J2/5249F24J2002/4658F24J2002/5215F24J2002/5294F24J2002/5486H01L31/0482Y02B10/12Y02B10/20Y02E10/47F24J2002/4659H02S20/23F24J2/4638H01L31/0481F24S2025/601F24S40/80F24S40/85F24S25/16F24S25/615F24S25/60F24S2025/6001F24S2025/801F24S2025/021F24S2030/16Y02E10/50Y02B10/10H01L31/048
Inventor RUMMENS, FRANCOISBOSSUYT, JOCHENDECLERCQ, MARIODE RUYCK, LUCVAN DE VEL, LIEVENLECOINTRE, CHRISTOPH
Owner RENOLIT BELGIUM
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