|
Effect of non-uniform radiation on the exchange of heat between the opposite surfaces in a closed space-room Dimitrije Lilić If energy reflected or radiated from a sur face in a
closed space-room for which heat balance is being formed does not have a uniform
character, the sur face may be divided into smaller sur faces of approximately
uniform characteristics. A part of the uniform difused radiation falling from
one sur face onto another is defined as geometrical factor of radiation between
the sur faces. The effect of non-uniform radiation from one sur face on the
exchange of heat between the oppsite sur faces was being observed through the
interactive change of the geometrical factors of radiation. This work lays aut
the basic theoretical postulates, as well as the geometrical factors of
radiation for the surfaces under observation and their parts calculated
according to the formed mathematical model, their mutual dependance presented
through tables and graphs. Obtained values can be applied to all relative
relations of surface dimensions. Expression has been derived for determining
geometrical factors of radiation for two parallel rectangular surfaces of
different size and parallel sides, as well as an expression for calculating
geometrical factors of radiation for a group of surfaces with uniform
characteristics and applied to percieving the effect of doors and windows on the
exchange of heat through radiation with apposite surfaces of the room. Ključne reči: room, radiation, reflexion, uniform radiation, difuse radiation, geometrical factor of radiation, geometrical |