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Re: [TRNSYS-users] Building a greenhouse in TRNSYS
Paris,
If you ignore one or more walls then in essence you have
assumed that those walls are adiabatic and don't transfer any
energy. An open or screened "wall" will transfer quite a lot of
energy but primarily by convection. I would account for the wall
and make it a single massless, low thermal resistance layer then
spend some time working out how much infiltration air is going to
come through that wall.
As for the floor, a building sitting on ground will still
transfer some energy to/from the ground beneath. I'd treat the
floor of your greenhouse as some thickness of soil (perhaps
5-10cm) and as a BOUNDARY surface in TRNBuild. There are a few
accepted methods for determining the temperature of the ground
beneath the thin soil layer. You might look at the use of Type49;
it is probably the most rigorous in your case.
kind regards,
David
On 09/16/2021 14:18, Paris Pasqualin
via TRNSYS-users wrote:
Hello everyone,
if I create a building
in trnbuild and I don’t add a wall on certain direction,
does trnbuild understand that there is no wall and will make
the calculations based on that? The same goes for the flour.
To be more specific, I have to build a greenhouse and on one
side the greenhouse is open and covered with an insect proof
net (which shouldn’t have any effect on the thermal
calculations). The greenhouse also doesn’t have a floor. Can
I create the greenhouse without adding the wall and the
flour or I should adopt some “tricks”?
Best regards,
Paris
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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com