Externet Posted March 20, 2022 Share 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. Link to comment Share on other sites More sharing options...
swansont Posted March 20, 2022 Share 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. Link to comment Share on other sites More sharing options...
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