Sam,
You are certainly correct that covering a roof with PV panels will change the roof temperature. There are also impacts of how much (if any) air flows between the panels and the roof and at times, the PVs can radiate to the night sky and provide some cooling to the roof.
If you are using one of the standard PV models in TRNSYS then you won't see any impact. Those PV models just compute electrical output. They don't deal with any thermal impact that the array has on its surroundings. If you need to estimate the impact of the PV panels on the roof, you'll need to use one of the BIPV components in the TESS Electrical library to model the PV.
kind regards,
David
Dear community,
I'm wondering if the roof of the building I'm modelling is 70% covered of PV panels increases roof's temperature,
Let's assume 20% of solar energy is converted to electricity, the remaining 80% is thermal energy stored in the PV panels as heat and transmitted to the roof and the sky, thus increasing roof's temperature compared to a low absorption roof coating (cool roof withoutPV panels) ? am I getting this wrong ?
Thank you!
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-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 3 North Pinckney Street - suite 202 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com