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[TRNSYS-users] Change the Simulation Time
Dear all,
I set the simulation time as 18 h, there is an occupant from 8 h to 18 h. But I only need the simulation curve from 8 to 18 h, I don't need the curve from 0 to 8 h. I tried some methods but it doesn't work. E.g. 1) I set the Simulation start time and stop time as 8 h and 18 h separately, but the simulation results of some parameters is different from from 0 to 18 h, moreover, the effect is bad.
2) I set the time as 8640 h + 18 h, i.e. the second year from 0 to 18 h, but I still can't obtain the curve of 8 h to 18 h of the second year.
Please give me some advices!
Many thanks a lot in advance!
Br.
wang
2011/9/5
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Today's Topics:
1. External shading factor (Damien Gondre)
---------- 已转发邮件 ----------
From: Damien Gondre <dgondre.etamine@gmail.com>
To: trnsys-users@cae.wisc.edu
Date: Mon, 5 Sep 2011 18:26:36 +0200
Subject: [TRNSYS-users] External shading factor
Hello,
I have a question about “external shading factor” defined in TRNBuild.
Does this factor apply to beam radiation or total radiation?
In others words if I define an external shading factor “Eshad”, a view factor to sky “VFS”, and a window g-value “gw” and if my window receives beam radiation “Ib” and diffuse radiation “Id”, does the total radiation “It” that is transmitted through the window is:
1) It = (Ib*(1-Eshad) + VFS*Id) * gw (?)
Or
2) It = (Ib * (1-Eshad) + Id*(1-Eshad)*VFS) * gw (?)
Or
3) It = (Ib+Id) * (1-Eshad) * gw (?)
Equations 1) and 2) make sense to me but I don’t know which one is correct (if one is actually correct). 3) would be more surprising (because the VFS doesn’t apply in this case).
I looked at the user guide and the Type 56 mathematical description but I couldn’t find any answer. I also looked at the Trnsys-users archives and even if external shading factors have been discussed several times I didn’t find the answer to my question.
Thanks,
Damien Gondre.
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