[TRNSYS-users] Building a greenhouse in TRNSYS

[David BRADLEY]

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 at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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