to be safe set the outside boundary condition of the floor as
"adiabatic" -- while this says there is no heat transfer to the
ground, there will also be no confusion of heat transfer FROM the
ground.
At 11:30 AM 7/2/2009, v s wrote:
The problem i had and drive me
to the solution of "basement"
was that when the floor had NO insulation, i needed 500Kwh for
heating.
When i added 3mm insulation, i needed 2500Kwh for heating.