[TRNSYS-users] Coupling airflow (in TRNbuild) versus TRNflow

David Bradley bradley at tess-inc.com
Tue Feb 10 09:57:39 PST 2009

TRNBuild (Type56) only asks the user to provide the amount of air flow
from zone "A" into zone "B" (note that Type56 does NOT assume that an
equal amount of air flows back from zone "B" to zone "A" so you have to
take care of the mass balance manually). TRNFlow actually figures out
what the flows back and forth would be based on temperature differences,
pressure differences, and mechanical systems in the two zones. It also
takes into account the entire building, not just the two zones. I
imagine that it would be very hard to run exactly the same case using
TRNBuild and setting the mass flows manually and using TRNFlow. Even if
the flow between the two zones is the same, it may be that TRNFlow is
calculating some other flows elsewhere (increased infiltration for example).
Kind regards,

kevin maiques wrote:
> Dear TRNsys-users
> I simulate the same flow between two zones with TRNbuild and TRNflow.
> But I don't have same results.
> It seems to me that the evolution of temperature is more realistic
> than temperature with coupling airflow of TNRbuild.
> I want to know ifI can continue to simulate coupling airflow with
> TRNbuild or not?
> Best Regards.
> ------------------------------------------------------------------------
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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
P: +1.608.274.2577 
F: +1.608.278.1475
E-mail: bradley at tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com


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