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Abstract

Four classes of conductances are needed to describe thermal conditions in an enclosure: (1) conductances describing the physical surface-surface and surface-air heat exchanges, (2) the (approximate) conductances resulting from the delta to star transformations of (1), (3) the conductances associated with an internal heat source, and (4) the conductances associated with a passive measuring element. An index temperature describing the air and surfaces can be expressed in terms of (2). If the conductances (3) bear a special relation to those of (2) this index and the temperature of a hot body source can be combined to form a further index which is environmental temperature. This transformation is possible generally in a very simple (two temperature) enclosure, in unique circumstances in a three temperature enclosure and only approximately if more enclosure detail is specified. Environmental temperature is the temperature of the enclosure at which heat is effectively input, the temperature which drives the heat loss and the temperature which typifies heat exchange between the enclosure and its contents. This index is a development of an earlier index based on air and inside surface temperatures only.

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The transformations of the environmental temperature procedure

Abstract

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References