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Sascha,<br>
You are correct about the error in the effref equation in Type94.
It has been fixed and will be released in an update. <br>
<br>
As far as looking at response to small time steps is concerned
there are two issues that you need to consider. First, Type94 (and
Type194) are quasi steady state models meaning that they are
designed to be used at time steps that are longer than their
transient response times. You would need to modify Type94 to add
transient effects such as thermal response. I would imagine that the
transient electrical response of the module still has a time
constant a good bit shorter than 1 second. Secondly, you need to
carefully consider your solar radiation data. Weather data files
read by Type15 contain hourly total solar radiation data. The
algorithms in Type15 that are used to compute subhourly radiation
values were developed to give good accuracy (i.e. represent reality)
down to about 15 minute intervals. Beyond that point the algorithms
that break total radiation up into diffuse and beam radiation over
short time periods begin to be less correct, especially if you are
dealing with a day that has a highly variable degree of cloudiness.
If you look over a 15 minute period, the average solar radiation
follows a fairly predictable pattern. If you look over a 1 minute
(or even more so a 1 second) period then whether there is currently
a cloud obscuring the sun has a very strong impact on the amount of
solar radiation incident on your PV.<br>
<br>
Kind regards,<br>
David<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/27/2014 01:08, Lindig Sascha
wrote:<br>
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<pre><span style="color:#1F497D" lang="EN-US">Hello<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">I`m comparing Type 194 and Type 94 to see the differences between the types.<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">It occurred that the calculation for effref is different while the calculation the cell temperature of the type. It seems to me that the equation for Type 94 is wrong (effref = (imr/nprl)*(vmr/nser)/(sunr)) since it does not include the area of the module?<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">Another thing is the calculation of it. I want to simulate small timesteps (1s) to see how the temperature and the behavior of the system changes when changing the ambient conditions. But after the first timestep steady state conditions are already reached. Is there a way to improve that or maybe another type which is better suited for this purpose?<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">Thanks in advance<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">Sascha<o:p></o:p></span></pre>
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David BRADLEY
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