[TRNSYS-users] Problem With Type 88

[Adrien JEZEQUEL <a.jezequel@itf.biz>]

Dear Trnsys Users,

I have convergence problem with Type 88 when I connect the Input 2 
"Humidity ratio of ventilation air".

In my program, the external air humidity ratio is obtained after 
connecting Type 109-TMY (meteo file) with Type 33e (Psychrometrics: Dry 
Bulb and Relative Humidity Known). The first output of Type 33e gives 
the Humidity Ratio. But when I connect this output to Type 88 Input 2 
(Humidity ratio of ventilation air) an error specify that the maximum 
number of warning allowed per simulation is exceeded.

The warning message is written below :
  / The referenced UNIT /(Type 88)/ has called the PSYCHROMETRICS 
routine witha humidity ratio above the saturation humidity ratio for the 
given  dry bulb temperature. The air was assumed saturated at the given 
dry bulb temperature and the humidity ratio set for this condition.

/If I don't use Type 88 Input 2 ( which defines Humidity ration of 
ventilation air) the simulation runs correctly...
/
/Does anyone know why this error appears? May I connect other Type 88 
inputs, or specify other Type 88 parameters?

Thanks in advance for your help,

Best regards

Adrien


--

***************************************************************
Adrien JEZEQUEL	
Ingénieur en Simulations Dynamiques
ITF (Ingénierie Tous Fluides)
87, route de Chambéry
73230 ST ALBAN EN LEYSSE
FRANCE
Tel: 04.79.75.00.29
Website: www.itf.biz
Mail : a.jezequel@itf.biz