The traditional handling method of handling heat exchange in a room for design purposes was to suppose that all heat from the plant, radiative as well as convective, was input at a so called "air temperature". This is an evident misnomer, since air temperature as such cannot drive longwave radiation as themodel actually assumed. The "environmental temperature" concept has been introduced in the UK to get round the difficulty. This paper presents an analysis of when an approach along these lines may be logically acceptable.
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