AW: WALL TIMEBASE and timesteps

["hotline" <hotline@xxxxxxxxxxxxxx>]

Dear Marco,
as Michael already said 1 h is a common value for the wall timebase.
This value is depending on the thickness of your walls.
For the simulation timestep should be 0.25 - to 0.01 This depends on the 
effects you want to simulate e.g. if you have a school with only 5 min rests for ventilation
you should get down to 0.01.
For big timesteps the control of your ventilation becomes more important please don't use
an equation with LT or GT but TYPE2 instead

with kind regards,

your TRNSYS Hotline Team

T.Welfonder, M.Rudolph


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-----Ursprüngliche Nachricht-----
Von: Marco Sangiorgi [mailto:sangiorgim@inta.es] 
Gesendet: Dienstag, 9. Dezember 2003 14:27
An: trnsys@relay.doit.wisc.edu
Betreff: RE: WALL TIMEBASE and timesteps


Well,

the problem is that I can't find a right timestep/timebase. I've tried several times, but I get either a solution that leads the temperature inside my building (Type56) to grater and grater values, or smaller and smaller values :-(

This occurs just when my ventilations (defined in the prebid *.bui file) are ON. But it does not occurs as the ventilations switch on; at the beginning the results seems fine, then they start to fluctuate and diverge.

Any advice?

Thanks,

Marco