Variable heat flow through walls of cavity construction, naturally exposed

Abstract Exact solutions are calculated to two problems of non-steady heat flow in a cavity wall structure. The first considers periodic heat flow applied as a regular sinusoidal variation in the ambient temperature at the outside surface. The second examines transient flow in which the applied temperature condition is a single step-function of time. In both cases the opposite or inside surface of the wall is assumed to face a constant temperature enclosure.