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Re: [TRNSYS-users] Type for VAV system

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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