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Knut Erik,<br>
Type31 and 709 take an overall UA for losses from the pipe. Where
Type604 goes a bit farther is to calculate the loss coefficient based
on some natural convection correlations. I think it also separates out
convection and radiation and accounts for the thermal mass of the pipe
and insulation. <br>
Kind regards,<br>
David<br>
<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:knut.erik.enerstvedt@niva.no">knut.erik.enerstvedt@niva.no</a> wrote:
<blockquote
cite="mid:OFE0D14068.C0EB4DC7-ONC12575B5.002A33EC-C12575B5.002BC9E3@LocalDomain"
type="cite"><br>
<font face="sans-serif" size="2">Jeff,</font><br>
<br>
<font face="sans-serif" size="2">Thank you for answering my question.</font><br>
<br>
<font face="sans-serif" size="2">However, I can't seem to find Type
604
in the TESS Hydronics library. Instead, I see that Type 604 is listed
among
the individual TESS components. Do you think it would be possible to
use
Type 31 or Type 709 (TESS Hydronics) instead, connecting the
"environment
losses" output as GAIN in Type 56, or is this a bad idea since I can
not separate conective and radiative gains?</font><br>
<br>
<font face="sans-serif" size="2">Kind regards,</font><br>
<font face="sans-serif" size="2">Knut Erik</font><br>
<br>
<br>
<br>
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<td width="40%"><font face="sans-serif" size="1"><b>"Jeff
Thornton"
<a class="moz-txt-link-rfc2396E" href="mailto:thornton@tess-inc.com"><thornton@tess-inc.com></a></b> </font>
<p><font face="sans-serif" size="1">05/12/2009 07:21 PM</font>
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<div align="center"><font face="sans-serif" size="1">Please
respond to<br>
<a class="moz-txt-link-abbreviated" href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a></font></div>
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<div align="right"><font face="sans-serif" size="1">To</font></div>
</td>
<td><font face="sans-serif" size="1"><a class="moz-txt-link-abbreviated" href="mailto:knut.erik.enerstvedt@niva.no">knut.erik.enerstvedt@niva.no</a>,
<a class="moz-txt-link-abbreviated" href="mailto:trnsys-users@engr.wisc.edu">trnsys-users@engr.wisc.edu</a></font></td>
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<div align="right"><font face="sans-serif" size="1">cc</font></div>
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<div align="right"><font face="sans-serif" size="1">Subject</font></div>
</td>
<td><font face="sans-serif" size="1">Re: [TRNSYS-users]
Heating pipes model</font></td>
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<br>
<br>
<font size="2"><tt><I need to model heating pipes commonly found
in
greenhouses. The pipes<br>
are in loops located 15 cm above the floor, 1 m above the floor, along
the<br>
walls and somewhat below the ceiling. Hot water flows in the pipes and<br>
heats up the greenhouse. I use Type 56 to model the greenhouse, but have<br>
not yet succeded in finding a model for the heating pipes. Does anyone<br>
know an appropriate model for the heating pipes and how to use it in<br>
combination with Type 56? ><br>
<br>
We use the Type 604 model (TESS Hydronics) which accounts for the<br>
convective and radiative heat transfer to the zone. Then simply set
up a<br>
new "gain" inside of Type 56 and set the radiative and convective
gains as<br>
inputs to Type 56. Then make the connections from Type 56 to the
pipe<br>
(zone temperature and effective surface temperature) and from the pipe
to<br>
Type 56 (radiative heat transfer and convective heat transfer).<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 class="moz-txt-link-abbreviated" href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a><br>
Web: <a class="moz-txt-link-abbreviated" href="http://www.tess-inc.com">www.tess-inc.com</a><br>
<br>
</tt></font><br>
------------------------------------------------------------------------------------------------------------<br>
Meld deg på vårt nyhetsbrev på <a class="moz-txt-link-abbreviated" href="http://www.niva.no">www.niva.no</a><br>
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<br>
<pre class="moz-signature" cols="72">--
***********************************************************************
Thermal Energy System Specialists (TESS), LLC
David BRADLEY 22 N. Carroll Street - Suite 370
Partner Madison, WI 53703
USA
P: +1.608.274.2577
F: +1.608.278.1475
E-mail: <a class="moz-txt-link-abbreviated" href="mailto:bradley@tess-inc.com">bradley@tess-inc.com</a>
Web Pages: <a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a> and <a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a>
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