Hi All,<br><br>Thanks for all the responses. I will probably use WATSUN for this project, but could use a hand with something:<br><br>for "Collector Test Data" the program requires that I enter in some test parameters for the solar panel:<br>
<br>A (no units)<br>B (1/C)<br>C (W/m2/C)<br>D (W/m2/C2)<br>E (W/m2)<br><br>This data is used in the following formula:<br><br>Q = Area ((A + B dT) Akt H - (C + D dT) dT - E)<br><br>where:<br><br>Akt is the incidence angle modifier<br>
H is the incoming solar radiation<br>dT is
the temperature difference between the collector inlet and ambient air<br><br>The help file indicates that I should be able to get these numbers from the manufacturer or from a testing agency, however, the data I have found includes variables A, C and D, but not B and E according to test EN-12975-1,2:2004. Unfortunately the Help file gives no indication of what test these numbers should come from or any other information.<br>
<br>Can anyone give me a hand here?<br><br>Thanks,<br><br>--<br>Karen<br><br><div class="gmail_quote">On Wed, Jul 29, 2009 at 11:26 AM, B. Fountain <span dir="ltr"><<a href="mailto:bfountain@greensim.com">bfountain@greensim.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Karen,<br>
<br>
Transys is ideal for that type of analysis. Another (cheaper) option to<br>
consider would be WATSUN from Natural Resources Canada. It comes with<br>
.TMY for Canadian sites -- I do not know about compatibility with US .TMY<br>
data. Price is right though.<br>
<br>
WATSUN is available (for free) here:<br>
<div class="im"><br>
<a href="http://canmetenergy-canmetenergie.nrcan-rncan.gc.ca/eng/software_tools/watsun.html" target="_blank">http://canmetenergy-canmetenergie.nrcan-rncan.gc.ca/eng/software_tools/watsun.html</a><br>
<br>
</div>I have not played much with it but it does produce hourly results to a<br>
text file. Note that it only uses SI units.<br>
<br>
Cheers,<br>
Brian<br>
<div><div></div><div class="h5"><br>
> <Is anyone aware of a program that can model hourly outputs for a solar<br>
> hot water system? I would prefer something that can accept a TMY2 or TMY3<br>
> weather file and just gives me the hourly heat output based on SHW panel,<br>
> inlet and outlet temperatures, angle and azumith. I'll handle the load<br>
> side, including thermal storage, etc.><br>
><br>
> In my opinion, TRNSYS is probably the best program to handle your stated<br>
> solar domestic hot water simulation needs - at timesteps of an hour all<br>
> the way down below a second if you need that type of resolution. But it<br>
> can also do the entire balance of system (thermal storage, controls,<br>
> interaction with the building, etc.). However, it's a bit on the pricey<br>
> side if you're only going to be using it for one project.<br>
><br>
> Give us a call if you'd like to discuss your project. We do a lot of<br>
> solar thermal projects and could help answer some of your modeling<br>
> questions. Good luck with your project.<br>
><br>
> Jeff<br>
><br>
><br>
> Jeff Thornton<br>
> President - TESS, LLC<br>
><br>
> 22 North Carroll Street - Suite 370<br>
> Madison WI 53703 USA<br>
><br>
> Phone: 608-274-2577<br>
> Fax: 608-278-1475<br>
> E-mail: <a href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a><br>
> Web: <a href="http://www.tess-inc.com" target="_blank">www.tess-inc.com</a><br>
><br>
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<br>
</div></div></blockquote></div><br>