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<p class="MsoNormal">Dear All,<o:p></o:p></p>
<p class="MsoNormal">I am modelling a double-façade in which the outer glass pane embeds a double-glass PV module.<o:p></o:p></p>
<p class="MsoNormal">Since thermal (e.g. solar gains coming from the adjacent zone) and energy generation (I want to use the glass-pane temperature as PV cell temperature) issues have to be solved together, I thought that the best approach would be the definition
of a new glass pane in Window4, where final optical properties (Tsol, Abs1, Rfsol, Rbsol, Tvis, Rfvis, Rbvis) are weighted on PV cell and glass surface ratios, and in particular:
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">e.g. Tsol,final = Tsol,PV * f_PV + Tsol,glass * (1-f_PV)
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">where f_PV is the PV surface ratio.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simulation stops with an error and the following error messages are displayed.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">*** Notice at time : 0.000000<o:p></o:p></p>
<p class="MsoNormal"> Generated by Unit : 56<o:p></o:p></p>
<p class="MsoNormal"> Generated by Type : 56<o:p></o:p></p>
<p class="MsoNormal"> Message : winlib reader: incorrect visual+solar reflection value -0.482 encountered in Window-ID 4304000 for angle 0 °<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">*** Fatal Error at time : 0.000000<o:p></o:p></p>
<p class="MsoNormal"> Generated by Unit : 56<o:p></o:p></p>
<p class="MsoNormal"> Generated by Type : 56<o:p></o:p></p>
<p class="MsoNormal"> Message : iniglasdata: value negative or greater then 1 for nonvisual absorption W4_front was found after fitting for Window-ID 4304000 : abs_nonvis= 1.3473871218 at angle = 1<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is the approach I followed wrong? Are there different possible ways to following in modelling double-glass PV modules? Which is your modelling experience with these systems?<o:p></o:p></p>
<p class="MsoNormal">Thank you.<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-GB">Matteo D’Antoni<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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