A Spanish-Algerian reserch group has examined how “cool roofs” might assist enhance energy yield in rootop bifacial PV methods. Cool roofs are primarily based on coating supplies with excessive reflectance properties.
An Algerian-Spanish analysis workforce has checked out how cool roofs (CR) might assist enhance energy yield in bifacial rooftop PV methods and has discovered that the proposed mixture gives increased power yields than bifacial counterparts deployed on typical roofs.
The scientists defined that cool roofs are roofs fabricated from extremely reflective coatings with a excessive emissivity within the thermal infrared. “They’re usually used on constructing roofs as a result of they decrease their temperature in comparison with corresponding roofs with out the coating,” they mentioned. “They’ve been proven to considerably scale back the power required for cooling buildings and the warmth island impact in city environments and might provide financial advantages.”
These roofs are primarily based on coating supplies with excessive reflectance properties, which the researchers mentioned will increase the radiation acquired on the panels’ bottom.
The group examined its new method on the take a look at bench positioned on a constructing in Barcelona. The set up contains 4 PV methods, every consisting of three bifacial PV modules linked in collection. The methods are a reference monofacial array, a bifacial array above a traditional ground, a bifacial array above a cool-roof-coated ground, and a bifacial array above the conventional ground with different varieties of PV modules.
For all methods, the teachers used 320 W modules from Chinese language producer JA Photo voltaic and 1.5 kW inverters from China-based Solax. The testing interval ran from April 2020 to November 2021. Throughout the winter months, the encircling buildings solid shadows on the arrays.
The evaluation confirmed that the bifacial array above a cool-roof-coated ground achieved the best power yield.
“When a cool roof coating is used beneath the bifacial modules, PV manufacturing may be considerably boosted (+8.6%) in comparison with the monofacial resolution, that means an financial profit about 18.3 €/kWp/yr,” the group mentioned. “Furthermore, the [cool roof] coating might help scale back ground temperatures in unshaded areas throughout summer season (−3.8 °C), doubtlessly resulting in important power financial savings in cooling the constructing.”
The scientists mentioned that cool roofs might be both added to the ground of current bifacial rooftop PV methods or used for brand new installations. “It’s an already out there market product with affordable prices that provides twin benefits: elevated power yield and lowered constructing cooling consumption, each yielding financial advantages,” they concluded.
The researchers introduced their findings “Experimental power efficiency evaluation of a bifacial photovoltaic system and impact of cool roof coating,” which was lately revealed within the Journal of Constructing Engineering. The analysis group is shaped by lecturers from Spain’s analysis middle Tecnalia, Algeria’s Middle for the Growth of Renewable Energies (CDER), the Universitat Politècnica de Catalunya, and the College of the Basque Nation.
This content material is protected by copyright and will not be reused. If you wish to cooperate with us and wish to reuse a few of our content material, please contact: editors@pv-magazine.com.
