Renolit France has introduced the Alkor Bright reflective membrane for dual-sided rooftop PV systems, offering high solar reflectance and durability for flat or sloping roofs. The membrane helps keep buildings cooler and at the same time increases the energy yield of double-sided solar panels.
Renolit France, the French arm of German supplier of plastic films, sheets and polymer-based products Renolit, has unveiled a new reflective membrane for dual-sided rooftop PV systems at the Energaia fair in Montpellier, southern France.
“Our Alkor Bright membrane is produced in Spain and stored in Belgium,” says Julien Ertel, Sales Manager France pv magazine. “It is available worldwide and the price varies depending on the project and the customer. Basically it’s all about waterproofing. It is suitable for flat roofs on concrete, wooden or steel supports, and can also be used on sloping roofs.”
The membrane is a single-layer sheet of flexible polyvinyl chloride (PVC), reinforced with woven polyester and finished with a highly UV-reflective protective coating.
According to the manufacturer, the surface is treated with a dirt-repellent, UV-protective clear coat that maintains reflectivity and minimizes maintenance. The white surface in combination with the UV-reflective coating gives the membrane a Solar Reflectance Index (SRI) of approximately 115, which Renolit describes as one of the highest on the market.
The company claims that the membrane, thanks to its high reflectivity and ability to reduce roof surface temperatures, not only keeps buildings cooler by reducing heat transfer, but also improves the performance of rooftop photovoltaic systems. This increases the energy yield of bifacial modules, which benefit from both lower operating temperatures and reflected radiation.
“The installation is relatively simple and comparable to conventional single-layer PVC-P roof membranes,” adds Ertel.
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