<br><font size=2 face="sans-serif">David,</font><br><br><font size=2 face="sans-serif">Thanks for your explanation. But my
real concern is whether Type 31/709 is suitable as a model for heating
pipes in a greenhouse, since I do not have Type 604.</font><br><br><font size=2 face="sans-serif">Kind regards,</font><br><font size=2 face="sans-serif">Knut Erik</font><br><br><br><br><table width=100%><tr valign=top><td width=40%><font size=1 face="sans-serif"><b>David Bradley <bradley@tess-inc.com></b></font><p><font size=1 face="sans-serif">05/14/2009 08:05 PM</font><td width=59%><table width=100%><tr valign=top><td><div align=right><font size=1 face="sans-serif">To</font></div><td><font size=1 face="sans-serif">knut.erik.enerstvedt@niva.no</font><tr valign=top><td><div align=right><font size=1 face="sans-serif">cc</font></div><td><font size=1 face="sans-serif">thornton@tess-inc.com, trnsys-users@engr.wisc.edu</font><tr valign=top><td><div align=right><font size=1 face="sans-serif">Subject</font></div><td><font size=1 face="sans-serif">Re: [TRNSYS-users] Heating pipes model</font></table><br><table><tr valign=top><td><td></table><br></table><br><br><br><font size=3>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></font><font size=3 color=blue><u><br></u></font><a href=mailto:knut.erik.enerstvedt@niva.no><font size=3 color=blue><u>knut.erik.enerstvedt@niva.no</u></font></a><font size=3>wrote: </font><br><font size=2 face="sans-serif"><br>Jeff,</font><font size=3><br></font><font size=2 face="sans-serif"><br>Thank you for answering my question.</font><font size=3><br></font><font size=2 face="sans-serif"><br>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><font size=3><br></font><font size=2 face="sans-serif"><br>Kind regards,<br>Knut Erik</font><font size=3><br><br><br></font><table width=100%><tr valign=top><td width=42%><font size=1 face="sans-serif"><b>"Jeff Thornton"
</b></font><a href="mailto:thornton@tess-inc.com"><font size=1 color=blue face="sans-serif"><b><u><thornton@tess-inc.com></u></b></font></a><font size=1 face="sans-serif"></font><p><font size=1 face="sans-serif">05/12/2009 07:21 PM</font><font size=3></font><br><table border=4 width=100%><tr valign=top><td width=100% bgcolor=white><div align=center><font size=1 face="sans-serif">Please respond to</font><font size=1 color=blue face="sans-serif"><u><br></u></font><a href="mailto:thornton@tess-inc.com"><font size=1 color=blue face="sans-serif"><u>thornton@tess-inc.com</u></font></a></div></table><p><td width=57%><br><table width=100%><tr valign=top><td width=13%><div align=right><font size=1 face="sans-serif">To</font></div><td width=86%><a href=mailto:knut.erik.enerstvedt@niva.no><font size=1 color=blue face="sans-serif"><u>knut.erik.enerstvedt@niva.no</u></font></a><font size=1 face="sans-serif">,
</font><a href="mailto:trnsys-users@engr.wisc.edu"><font size=1 color=blue face="sans-serif"><u>trnsys-users@engr.wisc.edu</u></font></a><tr valign=top><td><div align=right><font size=1 face="sans-serif">cc</font></div><td><tr valign=top><td><div align=right><font size=1 face="sans-serif">Subject</font></div><td><font size=1 face="sans-serif">Re: [TRNSYS-users] Heating pipes model</font></table><br><br><table width=100%><tr valign=top><td width=49%><td width=50%></table><br></table><br><font size=3><br><br></font><font size=2><tt><br><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: </tt></font><a href="mailto:thornton@tess-inc.com"><font size=2 color=blue><tt><u>thornton@tess-inc.com</u></tt></font></a><font size=2><tt><br>Web: </tt></font><a href="http://www.tess-inc.com/"><font size=2 color=blue><tt><u>www.tess-inc.com</u></tt></font></a><font size=2><tt><br></tt></font><font size=3><br><br>------------------------------------------------------------------------------------------------------------<br>Meld deg på vårt nyhetsbrev på </font><a href=http://www.niva.no/><font size=3 color=blue><u>www.niva.no</u></font></a><br><font size=3><tt><br></tt></font><hr><font size=3><tt><br>_______________________________________________<br>TRNSYS-users mailing list<br></tt></font><a href="mailto:TRNSYS-users@cae.wisc.edu"><font size=3 color=blue><tt><u>TRNSYS-users@cae.wisc.edu</u></tt></font></a><font size=3><tt><br></tt></font><a href="https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users"><font size=3 color=blue><tt><u>https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users</u></tt></font></a><font size=3><tt><br> </tt></font><br><br><font size=3><tt>-- <br>***********************************************************************<br>Thermal Energy System Specialists (TESS), LLC <br>David BRADLEY
22 N. Carroll Street - Suite 370 <br>Partner
Madison, WI 53703 <br>
USA<br>P: +1.608.274.2577 <br>F: +1.608.278.1475<br>E-mail: </tt></font><a href="mailto:bradley@tess-inc.com"><font size=3 color=blue><tt><u>bradley@tess-inc.com</u></tt></font></a><font size=3><tt><br>Web Pages: </tt></font><a href="http://www.tess-inc.com/"><font size=3 color=blue><tt><u>http://www.tess-inc.com</u></tt></font></a><font size=3><tt> and </tt></font><a href=http://www.trnsys.com/><font size=3 color=blue><tt><u>http://www.trnsys.com</u></tt></font></a><font size=3><tt><br><br>***********************************************************************</tt></font><br>------------------------------------------------------------------------------------------------------------<BR>
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