Knut Erik,
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.
Kind regards,
David
knut.erik.enerstvedt@niva.no wrote:
Jeff,
Thank you for answering my question.
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?
Kind regards,
Knut Erik
<I need to model heating pipes commonly found
in
greenhouses. The pipes
are in loops located 15 cm above the floor, 1 m above the floor, along
the
walls and somewhat below the ceiling. Hot water flows in the pipes and
heats up the greenhouse. I use Type 56 to model the greenhouse, but have
not yet succeded in finding a model for the heating pipes. Does anyone
know an appropriate model for the heating pipes and how to use it in
combination with Type 56? >
We use the Type 604 model (TESS Hydronics) which accounts for the
convective and radiative heat transfer to the zone. Then simply set
up a
new "gain" inside of Type 56 and set the radiative and convective
gains as
inputs to Type 56. Then make the connections from Type 56 to the
pipe
(zone temperature and effective surface temperature) and from the pipe
to
Type 56 (radiative heat transfer and convective heat transfer).
Jeff
Jeff Thornton
President - TESS, LLC
22 North Carroll Street - Suite 370
Madison WI 53703 USA
Phone: 608-274-2577
Fax: 608-278-1475
E-mail: thornton@tess-inc.com
Web: www.tess-inc.com
------------------------------------------------------------------------------------------------------------
Meld deg på vårt nyhetsbrev på www.niva.no
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
--
***********************************************************************
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: bradley@tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com
***********************************************************************
|