[TRNSYS-users] Type 8, error#206

[Diego A. Arias]

Hi Stefan,

Please feel free to send me your project files.  I will be glad to try 
to find the problem.

Diego

Stefan de Kool wrote:

>Dear Diego,
>
>Thanks for your reply. Setting all infiltration values to zero does not
>help. I use succesive subst now. Also the infiltration was not very large
>anyway (qv=0.625 l/sm2); lowering it would not be realistic in this builing
>(atrium with glass outside walls).
>
>Kind regards
>Stefan
>
>-----Oorspronkelijk bericht-----
>Van: Diego A. Arias [mailto:daarias at wisc.edu] 
>Verzonden: dinsdag 14 maart 2006 23:22
>Aan: s.dekool at chr.chri.nl
>CC: trnsys-users at engr.wisc.edu
>Onderwerp: Re: [TRNSYS-users] Type 8, error#206
>
>Dear Stefan,
>
> From the description of your problem, it may be possible that the value 
>of infiltration is too high.   Therefore, the state of the system 
>differs significantly from one state to the other.  I would recommend 
>that you reduce the value of infiltration and see if this helps.
>Please try this solution with the successive substitution solver.  
>Powell's method was written in order to improve convergence of the 
>system, by solving a reduced set of coupled equations/components. I 
>don't see why the successive substitution solver would not work.
>Best regards,
>
>Diego
>
>
>Stefan de Kool wrote:
>
>  
>
>>Dear all,
>>
>> 
>>
>>I have an atrium with temperature controlled (on/off) natural 
>>ventilation in TRNSYS with TRNFLOW. I use a 3stage room thermostat 
>>type 8b to control ventilation openings at the roof and on the 1st 
>>floor. The control signal of the type 8 gives stranges results though 
>>and tends to oscillate for no appearant reason. When I use Powells 
>>method, the signal is okay but somewhere halfway the simulation (begin 
>>of summer), I get error 206 at multiple times:
>>
>> 
>>
>>TRNSYS ERROR # 206
>>
>>THE SOLUTION CAN NOT BE FOUND AT TIME 2532.62
>>
>> 
>>
>>Finally resulting in
>>
>> 
>>
>>TRNSYS ERROR # 204
>>
>>THE NUMBER OF UNSUCCESSFUL TIMESTES EXCEEDS LIMITS
>>
>> 
>>
>>Does anyone have an idea what can be wrong? Decreasing the timestep 
>>has no effect; application of a deadband also does not help; the 
>>errors occur earlier in the simulation when I use a larger deadband...
>>
>> 
>>
>>Kind regards
>>
>>Stefan de Kool
>>
>> 
>>
>> 
>>
>> 
>>
>>Cauberg-Huygen Raadgevende Ingenieurs
>>
>>Lokatie Rotterdam
>>
>> 
>>
>> 
>>
>>------------------------------------------------------------------------
>>
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>> 
>>
>>    
>>
>
>
>  
>