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Dear TRNSYS group, I am trying to model a solar hot water system using
vacuum tubes with concentrator (I am using Schott vacuum tubes). I only have
the instant efficiency test (quadratic equation) from the manufacturer. I am
not sure if I should use TYPE 74 (CPC collector) or TYPE 71 (Vacuum Tube),
because I don’t know if Type 71 –or the instant efficiency
equation- will take account of the “concentration effect” into the
absorber. Does anyone have any recommendations on what to do? Many thanks Xavi
Ariño |