[TRNSYS-users] PV Panels increase roof temperature ?

[David BRADLEY]

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


On 02/12/2020 11:19, Sam Elyas via TRNSYS-users wrote:
> 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 without
> PV 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 at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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