The paper discusses the early and later response of a slab, insulated on one surface and exposed to a fluid at its other surface, initially at a uniform temperature throughout and subjected at zero time to a step change in the fluid temperature. The situation is first generalised to include a radiant heat input at the slab surface and a convective heat input to the adjacent fluid. The situation is then generalised to analyse the response of a simple enclosure to step excitation and an example of computation of surface, environmental and air temperatures is given.
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