ABSTRACT
This chapter discusses the phenomena of thermal radiation heat transfer and some of the physical phenomena associated with radiant energy transfer that are encountered primarily at low temperatures. Radiation heat transfer is defined as the transfer of energy from one surface to surface through electromagnetic energy emission from one surface, transmission of that energy through the intervening space, and absorption of the energy by surface. The practical significance of this feature is that the magnitude of radiant heat transfer becomes quite small in the lower cryogenic temperature region. The advantage of the Monte Carlo method for radiant heat transfer analysis is that it may be applied for cases that cannot be solved explicitly by analytical techniques. Radiation heat transfer may be reduced by interposing floating shields of highly reflective material between the hot and cold surfaces. The net radiant heat transfer rate from the surface is the difference between the radiation leaving the surface and the radiation striking the surface.
