Circulate water through the collector when there is little or no solar radiation and the inlet temperature is above the ambient temperature.
Jeff
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Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
On 07/25/2012 4:26 pm, Richard Thygesen wrote:
Dear Trnsys users!
I wonder how it is possible to get a negative ”useful energy gain” from solar collector type 539 during some timesteps.
I have read the documentation without any success of finding the answer for this question.
Best regards
Richard Thygesen