[TRNSYS-users] Air denisty inside TrnFlow

[David BRADLEY]

Ayman,
   Since flow is driven between airnodes by both pressure and 
temperature differences, I would assume that the air density is 
calculated. I do not know what model is used, however. It may be that 
TRNFlow (Type56) calls the TRNSYS kernel routine "psychrometrics" to 
determine the density of dry air. You can look at the psychrometrics 
section in the Programmer's Guide or at the code to learn about its 
algorithm.
Kind regards,
  David

On 8/17/2011 09:41, Ayman Sarwa wrote:
> Hi every body
> According to define the fan inside Trnflow, the air density is defined 
> at test condition.
> Anyone have Knowledge about how the air density treated inside Trnflow ?
> Is it considered constant or calculated internally? if it is 
> calculated, what is the mathematical method used?
> thanks
> Regards
> Ayman
>
>
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> TRNSYS-users at cae.wisc.edu
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-- 
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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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P:+1.608.274.2577
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d.bradley at tess-inc.com

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