SARA,
The slope typically maximizes incident solar radiation, and hence useful energy gain, at a setting somewhat near the latitude. For your location, simply set up and run a parametric table and integrate the useful energy gain over the year. That'll show you what is best for that climate and the characteristics of your load. The evacuated tube collector can show negative values during periods of low (or no) solar radiation or periods of high inlet temperatures. But during typical operation, the value is positive - or you wouldn't ever install these devices to collect energy...
Jeff
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Jeff Thornton President - TESS LLC 3 N. Pinckney Street, Suite 202, Madison WI USA 53703 Office: (608) 274-2577 Fax: (608) 278-1475 www.tess-inc.com E-Mail: thornton@tess-inc.com
On 03/01/2021 11:59 am, Sara EL HASSANI via TRNSYS-users wrote:
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Dear sir
I am using Trnsys 18; however, I want to know the effect of the slope collector on the useful energy. The problem is that the useful energy gain of ETC(type71) gives negative values.RegardsSARAEL HASSANI SARA | Ph.D. StudentMechanical & Energetics LaboratoryMohammed First UniversityOujda, MOROCCO.Phone: +212(6)28240316E-mail: saraelhassani7@gmail.com
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