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

Fuqiao.Wang at fulcrumfirst.com Fuqiao.Wang at fulcrumfirst.com
Wed Feb 11 03:40:45 PST 2009

the fan-coil component is actually for water -air, if the water inlet temperature less than, say 0 C, then a warning message comes up, you know in TRNSYS total warning message is limit for most users. 
I have updated this model and glycol can be used in my updated model. let me know if you need further help.

Dr Fuqiao Wang

Sustainable Consulting Engineer


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From: David Bradley [mailto:bradley at tess-inc.com] 
Sent: 10 February 2009 20:49
To: mc03106delos at yahoo.gr
Cc: trnsys-users at cae.wisc.edu
Subject: Re: [TRNSYS-users] Adsorption chiller, Error related to enthalpy

  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,


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