[TRNSYS-users] Problem With Type 88

[David Bradley]

Adrien,
  I have run into the same problem a few times. 
The solution in my case was an issue of the air 
pressure at which the psychrometric calculations 
are made. Make sure to connect the atmospheric 
pressure from Type109 to Type33 and also from 
Type109 to Type88. Also, connect Type88 
temperature of ventilation air input from Type33 
instead of directly from Type109.
Kind regards,
  David


At 08:16 5/11/2007, Adrien JEZEQUEL wrote:
>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 at itf.biz
>
>
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>TRNSYS-users at engr.wisc.edu
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