Externet Posted March 20, 2022 Posted March 20, 2022 (edited) Hi all. Photovoltaic solar panels are around 18% efficient. That means a 1m2 panel should yield about 180 Watts to heat something electrically at full sun. What is the typical efficiency extracting heat directly from sun radiation, assuming also 1KW/m2 irradiance as in a 1m2 uncovered coil like : http://getgotechnology.com/wp-content/uploads/2014/12/Sun-Coil-heating.jpg Would it be around 60% ? Wind and thermal losses should be taking a good chunk, right ? Edited March 20, 2022 by Externet Image did not show.
swansont Posted March 20, 2022 Posted March 20, 2022 It depends. If you are just making hot water it’s 60-70%. If you are generating electricity it’s significantly lower.
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