Re: [TRNSYS-users] Air denisty inside TrnFlow

[David BRADLEY <d.bradley@tess-inc.com>]

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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