It is pointed out that Macey's formula, used in the CIBSE Guide to calculate the heat loss from a solid uninsulated ground floor slab, is unsymmetrical in its handling of the floor length and breadth L and B, and further that it implies the existence of a volume of perfectly insulating material embedded in the base of the wall (thickness W). Both flaws are avoided in a simple expression for heat loss which involves the floor dimensions grouped as LB/W(L + B). The expression provides an excellent approximation to an exact expression for heat loss due to Delsante, Stokes and Walsh.
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References
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CibseGuide Volume A ( London: Chartered Institution of Building Services Engineers) (1986)
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Anderson B.R.Calculation of the steady state heat transfer through a slab-on-ground floorBuilding and Environment26(4) 405-415 (1991)
