[TRNSYS-users] Type 641 (Humidifier TESS Libary) - Version 17.025

[David BRADLEY]

Roberto,
   You are correct, there is a mistake in the code. RH values at the 
TRNSYS user-interface level (ie inputs and outputs) are on a 0-100% 
scale. The psychrometrics routine inside TRNSYS, however, treats RH as a 
fraction instead (0-1) so we have to convert inputs and then convert 
them back. The input value conversion was not done. Thanks for pointing 
out the error. If I send you edited code are you able to compile and 
link it? If not, we can send you a modified DLL (i.e. already compiled 
and linked).
Best,
  David



On 11/16/2012 03:47, Roberto Ruiz wrote:
> Dear TRNSYS Users,
>
> I'm trying to implement a AHU model by coupling every component. AHU 
> also comprises an adiabatic humidifier modeled by means type 641.
> When I try to simulate it, I always receive a message saying that the 
> entered Relative humidity is greather than 100%.
>
> Looking in the code I found where the problem come from.
> *!Check the Inputs for Problems**
> ** If ((RHin > 1.) .and. (mode == 2)) Call 
> FoundBadInput(3,'Fatal','The return air relative humidity is greater 
> than 100.')*
>
> And where inputs are taken correspond to the following part of the code
>
> !Get the Current Inputs to the Model
>  Tin = getInputValue(1)
>  Win = getInputValue(2)
> * RHin = getInputValue(3)* !Should it be *RHin = 
> getInputValue(3)/100*??? (*)
>  ...
>
> Could somebody tell me, whether this "new type" (it seems to have been 
> written in other language) uses relative humidity values between 0-1 
> (as inputs)?
> Or maybe there is a mistake in the code (*)?
> Does this model provide output values (RH) in percentage or between 0-1?
>
> Thanks in advance!
>
> Roberto Ruiz
> -- 
> _________________________________________________
>
>   University of Liège
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> Phone  : +32 4 366 48 25 / +32 496 38 46 82
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> Mailto :r.ruiz at ulg.ac.be  
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>
>
>
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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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