[TRNSYS-users] :-(( Re: Problem With Type 88

[Adrien JEZEQUEL]

Dear David,

The problem in the soluation you gave me is that there is no atmospheric 
pressure input or parameter in Type88. So I can't connect Type 109 to 
Type 88.

Otherwise, I have tried to reorganize the component order to follow the 
natural flow of information as Diego said, but without success ...

Thanks for your help and king regards.

Adrien

David Bradley a écrit :
> 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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>
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-- 

***************************************************************
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