[TRNSYS-users] Type 8, error#206

[Stefan de Kool]

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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