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

[Adrien JEZEQUEL]

Dear Trnsys Users,

The problem in my simulation project was certainly due to an inadapted 
value attributed to one (or several) Type88 input(s). In that way, I 
have tried to give several values to ventilation mass flow rate input.  
My simulation runs fine until a certain mass flow rate. Above this 
value, the humidity ratio from the zone grows too much, and the 
simulation failed.

So I have to adapt parameters and inputs value defining in the model I use.

Thanks a lot for your help, have a nice day

Best regards,

Adrien


Adrien JEZEQUEL a écrit :
> 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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>>>       
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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