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<p class="MsoNormal">Hello<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have previously sent an email regarding an overestimation* of the IAM losses by the type94a so I opened the Fortran code for the model and I realized the following:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The equation used to calculate the IAM has a wrong sign in the third term (should be -6.26E-6 rather than +6.26E-6) (this error actually in some cases made the IAM to be larger than 1 which is incorrect as far as I know)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The last term in the equation used to calculate the IAM in the manual is 1.4<span style="background:yellow;mso-highlight:yellow">2</span>72E-8 while in the code is 1.472E-8<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">3-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Different equations than those indicated in the manual are used to calculate the effective angle of sky diffuse and ground diffuse radiation<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">4-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The variable SUNGND (surface ground diffuse radiation) is not calculated anywhere in the code and it is not one of the inputs
<span style="font-family:Wingdings">à</span> what value is used?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">5-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The reference efficiency EFFREF does not account for the module surface area so I believe it should equal: Vm*Im/SUNR*Area instead of Vm*Im/SUNR<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">6-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Equation 5.2.5-21 used to calculate the cell temperature in the manual (page 74) I believe is incorrect [It should be UL*(Tc-Ta)=TAU_Alpha*Gt*(1-Eff/TAU_Alpha) thus Tc=Ta+ TAU_Alpha*Gt*(1-Eff/TAU_Alpha)/UL ] (The equation is however
applied correctly in Type94 code script)<o:p></o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoNormal">Under the same conditions, the results of another PV special software (PVSYST) are 8-9% higher than those estimated by Type94a and when I deactivated the IAM in the model and calculated it separately I got similar results to those of PVSYST<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I still cant find out why the model overestimates the IAM losses
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please advise<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-AU">Regards,</span><span style="font-size:12.0pt;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-AU">Amir Nashed<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-AU">PhD Candidate<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-AU">School of Renewable Energy and Photovoltaic Engineering<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-AU">University of New South Wales<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-AU">Phone:+61405979282<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-AU">Email:a.nashed@unsw.edu.au</span><span style="mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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