[EnergyPlus_Support] Re: how the Slab program work

["Jean marais" <jeannieboef@xxxxxxxxx>]

As ground temperatures are at roughly 18 deg C and conditioned zones inside are about 22 deg C AND the slab itself is quite thick with usually a large U-value, this makes for a small driving force (delta T) and a large resistance (U-value) which means  that the amount of energy exchange is small and the effect of different slab temperatures on this energy transfer is minimal.

What I'm saying is when improving simulation accuracy, the first place to start is getting more and more accurate data for input on things like people, usage and lights and the last place the slab simulation.

Unless specifically comparing slab types and behaviour, I believe the assumtion recomended by e+ of using a temperure = inside temp - 2 K, to be accurate enough.  



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