[TRNSYS-users] Adsorption chiller, Error related to enthalpy

David Bradley bradley at tess-inc.com
Tue Feb 10 12:49:20 PST 2009

  It may be that the problem lies inside the code in an internal 
iteration (in other words not in a place that you can get to without 
running the simulation through a Fortran compiler. I would start by 
disconnecting the inputs to the fan coil (set them equal to constant 
values if you can) and then watch the outputs of whatever component is 
just upstream to make sure that the air state and water state going in 
to the fan coil is realistic.
Kind regards,

> Dear TRNSYS users,
> I'm trying to simulate a solar powered air conditioning system , which 
> uses an adsorption chiller in order to produce chilled water for the 
> fan coils.The problem is that there is no adsorption chiller-component 
> in the simulation studio. So does anyone know how is it possible, if 
> it's possible, to simulate the adsorption chiller using instead the 
> absorption chiller component?Is there any other way?
> I have one more question.When i'm trying to run the simulation using 
> of course the absorption chiller, error manager stops simulation and 
> warns me about an error located at the fan coil component.The exact 
> message is <<Attempted to take the log of a negative number.-Enthalpy 
> (H) is less than or equal to zero>>.The problem is that i can't find 
> anywhere an enthalpy parameter, except for the psychrometrics 
> component where there is an enthalpy output.Where should i search? I 
> should mention that the connected components maybe related with this 
> problem are these; weather data-->psychrometrics-->building<--fan 
> coil<--chiller etc.
> My regards,
> Sotiris
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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
P: +1.608.274.2577 
F: +1.608.278.1475
E-mail: bradley at tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com


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