Oops. I missed the description “no wind and no sun on these surfaces”. I’m not sure how you can model without sun unless you also changed the solar variables in the weather file, but I doubt you can model without radiant energy exchange to the sky.
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jim Dirkes
Sent: Wednesday, August 14, 2013 7:23 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Trying to explain temperature differences in a room with conduction
And radiant energy exchange with the sky
Jim Dirkes II
Building Performance Team
On Aug 14, 2013, at 7:10 AM, "ilikemyselfmore" <ilikemyselfmore@xxxxxxxxx> wrote:
Dear Group,
I am currently trying to simulate a room with no internal loads (people, lights and electric devices), no convection (no wind, no ventilation and infiltration). I am trying to show only the conduction effects through the walls, so I also tried to reduce the effects of the radiation.
To make sure that my simulation would work, I created an EPW file with a constant Dry Bulb Temperature at 5°C. Normally, the operative temperature in the room after a few weeks/months should also be 5°C. However, after running the simulation, I got 0.5°C in that room. All the 6 surfaces are made of 20cm thick concrete, and they are towards the outside. There is no wind and no sun on these surfaces.
I observe that the roof outside surface is -5°C and that the floor outside surface is +5°C, but I am not sure how to explain these differences. Does anyone have an idea?
Thanks for you attention,
Sarah
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