[TRNSYS-users] Type for VAV system

[David BRADLEY]

Christian,
   We do have a VAV model that mimics the way the DOE2 does VAV. I have 
used it in three LEED projects and the results have been accepted. The 
model commercially available among the individual TESS components. The 
reason that it is not in the TESS HVAC Component Library is that VAV 
controls seem to vary widely from one application to the next. In one 
case, the controls called for a humidity sensor in the return air stream 
and some steam injection if the RH was too low. In another the whole 
building's distribution air was cooled to 12.8C and then heating was 
provided at the terminal boxes. In another, the heating was centralized. 
In some cases I have found one central variable speed fan while in 
others, the fan power is at the terminal boxes. There is so much 
variability in VAV systems that writing one model that covers all of VAV 
is quite difficult.
Kind regards,
  David


On 1/30/2011 12:27, Christian Bauer wrote:
>
> Dear all,
>
> I'm new to this list. I´m working now for almost four years with 
> TRNSYS v15 and now v17.
>
> Currently we are doing several LEED project where we need to perform 
> the whole building simulation according to Appendix G of ASHRAE 90.1.
>
> We transformed the VAV-system into a bunch of equations, which work well.
>
> But we are not sure if it is the right way. Is there a specific type 
> to model a VAV system for one or more zones?
>
> How do you model buildings according to 90.1 App G?
>
> Kind regards
>
> chrisb
>
>
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> TRNSYS-users at cae.wisc.edu
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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