If reﬂected or emitted energy over the enclosure-room surface has not uniform characteristics, the surface should be divided into smaller
areas of more nearly uniform characteristics. The inﬂuence of window and door position at the wall on the radiation heat exchange in relation
to other interior surfaces of the room was considered by the interactive exchange of conﬁguration factors. In the paper, the conﬁguration
factors for the considered surfaces an its parts were calculated by the presented mathematical model. For this purpose, an expression for
determining the conﬁguration factor between two unequal parallel rectangles with parallel edges was generated as well as the expressions for
determining the conﬁguration factors for a group of areas with uniform radiation characteristics and applied to observe the inﬂuence of a
uniform group of areas and its position (window and door at the wall) on the radiation heat exchange in the room.
# 2002 Published by Elsevier Science B.V.