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@wisc.edu]
Verzonden: dinsdag 14 maart 2006 23:22
Aan: s.dekool@chr.chri.nl
CC: trnsys-users@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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