Arnaud,
With the release of TRNSYS 17.1, a new feature was added to
prevent users from having to manually connect a weather file to a
building. However, you can switch off that feature, which allows you
to give your building whatever values you want as inputs (whether
they are constant or time varying). When you open your *.b17 file in
TRNBuild, look at the "orientations" list in the project window. The
radiation falling on various surfaces will be set to either
"internal" or "-". Double click on an orientation name and you can
switch back and forth between "Internal" and "External by another
component." If you change all of your orientations to have
externally calculated radiation then you will be able to set
constant values for the inputs simply by entering input initial
values for Type56 and not connecting the inputs up from any other
component.
Regards,
David
On 3/14/2013 04:13, Arnaud Candaele
wrote:
Hi,
I'm new to TRNSYS, and I'd like to create steady weather
conditions to test a building.
I created a building using Google Sktechup, then started a new "3d
building project". Now, I'd like to force steady oustide
conditions, so that I can make a first analyze of my building.
My question is : how can I do that ? It seems that the building
model impose that I use a weather file. So I see 2 options : 1) I
create a "steady" weather file that I then use in my project, but
this doesn't seem that easy to do (or does such a weather file
already exist ? I didn't find one..), or 2) I try to modify my
project so that my building receives steady conditions instead of
time varying conditions from the weather file. I tried to do that,
and I could almost do it. I used "equations" modules to impose
constant conditions for TAMB, TGROUND, and so on.. it works. But
then, when I monitor the temperature in a room, it is not
completely flat. I don't understand why, because there is no
gain/heating in any room, and all inputs to the building are
constant, except for "AZEN" which is related to solar position.
This parameter, I can't impose constant because TRNSYS tells me it
HAS to be connected to the weather file.. So, that's the only
thing actually varying, so I guess this is the reason why I don't
get steady temperature in my monitored room.
In other words : how can I "disconnect" solar calculations from my
project ?
Or even a more generic question : how can I impose steady outside
conditions on my building, knowing that I created my project from
a 3D building from Google Sketchup... ?
I mean, it seems to me like a quite simple problem, but the
solution seems quite complicated...
Thank you for your help,
Arnaud.
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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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