[EN 16798-1:2019, 3.21]:
uniform temperature of an imaginary black enclosure in which an occupant would exchange the same amount of heat by radiation plus convection as in the actual non-uniform environment.Note 1 to entry: Further information is given in EN ISO 7726

[9] and FprCEN/TR 16798–2

[7].

[EN 12792:2003, 352]:
theoretical uniform temperature of an enclosure in which an occupant would exchange the same amount of heat by radiation and convection as in the actual non-uniform space.