2010 Volume 47 Issue 1 Pages 3-12
In a room, radiative heat transfers are leading part superior to convection or conduction. Radiation heat fluxes are calculated for some cases in an imaginary room; 1) Double-grazed windows, 2) Ceiling and a small part on the floor, 3) A human and enclosing wall. Radiative heat fluxes are greater than heat fluxes conduct through air, and as great as the basal metabolic rate. Cooling rates of hot water bottles prove the superiority of thermal radiation, a bottle painted black cools with twice rate of the bottle covered by aluminum cooking foil. The difference of rates agrees with the predicted value by the radiation theory. Radiometric sensors are expected usefulness and under development, then the theory for everyone is important tool to accomplish reasonable sensors and to accumulate reasonable knowledge.
