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[EnergyPlus_Support] Heat Gain Through a Slab on Grade Floor



All, 

I currently have a slab on grade floor that is adding heat to the space, as opposed to drawing from it. 

For example, at noon in January the conditions are

75F mean air temp in the zone
67F floor surface temperature
30F ground surface temp
1.1 kbtuh Surface Interior Convection Heat Gain to Air from the floor surface. 

How is the floor adding heat to the space when its temperature is lower than that of the space?

Anyone come across something like this?



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