Canadian scientists have developed a brand new approach to measure the vitality yield of a bifacial PV system. They are saying they consider the spectral albedo of floor cowl equivalent to snow and sand to foretell vitality features of as much as 2%, in comparison with the Worldwide Electrotechnical Fee (IEC) normal.
Researchers from the College of Ottawa’s Sunlab laboratory have developed a brand new approach to measure the vitality yield of bifacial PV programs. The innovation is meant to enhance the Worldwide Electrotechnical Fee (IEC) measurement normal launched in 2019.
The brand new scaled rear irradiance (SRI) technique is alleged to enhance IEC measurements by accommodating the consequences of various floor covers on spectral albedo in its calculation of the rear-side irradiance of the bifacial system.
To show the idea, the scientists modeled the manufacturing of a bifacial silicon heterojunction (HJT) photo voltaic module below the IEC bifacial illumination method and the SRI technique. They mounted the system on a horizontal single-axis tracker 1.22 meters off the bottom in Boulder, Colorado, United States. Thought-about floor covers are soil, crimson brick, inexperienced grass, roof shingles, concrete, sand, dry grass, and snow.
The outcomes present that for a rear irradiance of 200 W/sq. meters, the IEC measurement doesn’t distinguish between the totally different land covers, overestimating the bifacial acquire between 14% and 1.4% for all floor cowl apart from snow. The SRI technique, however, exhibits a transparent distinction between totally different working circumstances.
“The implementation of this technique to worldwide requirements for such panels could make predictions of out of doors bifacial panel efficiency inside 2% of absolute,” stated researcher Erin Tonita.
The brand new technique can even predict vitality yield features in places apart from Boulder with an error of lower than 7%, in accordance with the teachers.
The innovation can be utilized to check totally different bifacial applied sciences and enhance system efficiency by optimizing land cover-specific design, the authors say. They share their findings in “A common illumination technique to foretell the efficiency of bifacial photovoltaic programs,” which was not too long ago revealed in Joule.
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