Hello,
Is there any possibility to model an inner layer of a window as a PV with Ladybug tools or other Grasshopper tools?
not as a shading.
Pv like an inside louver
Hi mlk,
It would be more clear if you could clarify your question with a section of your glazing system layers. I did a quick search and I find this paper which should be a good start point.
So if you want to model such a complex fenestration system for energy and daylight simulation, my only suggestion is to model it in LBNL Window.
The paper shows how to deal with the PV layer as BSDF. You can use that BSDF as shading layer in Window. It is important in both energy and daylight model since the absorbed radiation in the PV layer is significant.
If you want to calculate the energy yield from PV panels, don’t think complicated. Just calculate the total amount of solar radiation on each panel and multiply that to the efficiency factor. However it is not an easy project, so get ready to have fun with your modelling process.
Regards,
Fazel
I agree with @fazel.ganji that it all comes down to what metric you’re trying to model. The BSDF approach is important if you’re trying to understand the impact of the window-integrated PV modules on interior daylight. And I agree that just calculating the incident irradiance on the window and multiplying it by (exterior_glass_transmittance * pv_coverage * module_efficiency) is probably good enough to estimate electricity harvested from the PV.
If you just want to understand the impact of the PV shading on thermal loads and the room energy balance, modeling them as a simple window construction with an average solar transmittance and SHGC that matches the values you get out of LBNL WINDOW is probably sufficient. E+ can simulate BSDF definition as Fazel notes but you’ll have to do a little customization to get it to work in LBT (either with additional strings or a measure). And, because the thermal lag of the E+ simulation will smooth out the effects of varying solar angles over time, using the BSDF here isn’t as critical for energy as it is for daylight simulation. It really just comes down to whether you want to understand the average effect on the energy balance over time or you’re using it in a case where the timestep-by-timestep solar gain is really important (like sizing a cooling system with E+ results).
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@fazel.ganji and @chris thank you so much,
I want to model some things like these
and my aim is to evaluate both thermal and lighting load Simultaneously. with your help and more search finally I will model layers of window but how can I define the specific layer as a pv that generate electricity?