Jean,
The deep ground boundary condition is a user input. You may specify either a constant temperature or a zero heat flux condition. Best practice is to specify a constant temperature equal to the average annual air temperature at the depth of either the water table, or 30 meters…whichever is closer to the slab.
Regarding the slab thickness, the input SLABDEPTH shouldn’t have any restriction. In fact, often times, depending on the material properties of the slab, the finite difference program will have to increase the thickness of the slab to ensure a computationally stable solution. I have seen some pretty thick slabs in the program much thicker than 25 inches.
Hope that helps.
Neal Kruis
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
Sent: Friday, April 20, 2012 3:57 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Question to Slab program
Where does it take its deep ground temperatures from? the weather file?
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