Tag Archive for: pvsystem

Elevated metro stations may highly benefit from rooftop solar power generation combined w/ battery storage, new research from China suggests.

Photovoltaics for elevated metro stations

Researchers from the Xi’an Jiaotong University in China have investigated how rooftop solar and battery storage may help cover energy demand in elevated metro stations and found this combination may achieve a self-sufficiency rate of up to 54% and a payback time of 10.2 years.

“Our work is the first study focusing on the PV potential of elevated subway stations based on real energy loads,” the research’s lead author, Haobo Yang, told pv magazine. “Our findings are based on measured hourly load demands and include the impact of battery energy storage on PV system performance.”

In the study “Technoeconomic analysis of rooftop PV system in elevated metro station for cost-effective operation and clean electrification,” published in Renewable Energy, Yang and his colleagues said their work is intended to provide a benchmark for cost-effective operation and clean electrification in urban metro networks.

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Source: PV Magazine

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Scientists in the Netherlands have assessed how the so-called blue-green roofs can help reduce the operating temperature of rooftop PV panels and have found they provide a significant cooling effect.

Well-irrigated roofs with vegetation have cooling effect on PV systems

A research group led by the Netherlands’ Water Research Institute has investigated how a blue-green roof (BGR) may act as a cooling agent for rooftop PV systems and has found that this kind of roof may lower the roof surface temperature by up to 4.64 C compared to a conventional bitumen roof (BiR).

Blue-green roofs are roofs that use “green” technologies, such as lateral drainage and irrigation for plant and crop growth, as well as “blue” technologies like rainwater storage and dosage.

The scientists conducted a series of tests on a PV system installed on a so-called constructed wetroof in an apartment building in Amsterdam. Constructed wetroofs are roofs that use natural processes involving wetland vegetation, soils, and their associated microbial assemblages to improve water quality. The irrigation system used for the research project relies on an additional water supply sourced from grey water from showers that is transformed into irrigation water.

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Source: PV Magazine

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