[TRNSYS-users] Vacuum tubes with concetrator

Xavier Arino Xavier.Arino at whitbybird.com
Tue Dec 6 09:20:30 PST 2005

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


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