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[EnergyPlus_Support] Aspect Ratio in Slab Preprocessor

I'm studying the physical model behind the slab preprocessor. It was hard to find information about it, particularly why the aspect ratio Area/Perimeter shoul be higher than 1.5. I've read the Bahnfleth model and I didn't find limitations to A/P. The Eplus Manual does not comment anything on this subject. Does it come from grid limitations, or from the thermal model? Would this imply that for a 5m x 5m prototype I cannot use the slab preprocessor? Thank you very, very much.



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