This animation shows a metal bar being heated to red hot in
a Bunsen burner flame. It is then held next to a cooler
metal bar. Infrared radiation (arrows) from the hot bar
carries energy to the cooler bar, causing it to warm up.
Heat loss by
radiation from the human body in a typical home and office
environment accounts for as much as 60% of the energy
transfer to the surrounding cooler surfaces. This is not
trivial as 99% of all
room thermostats which function off of air temperature
fail to sense what humans sense via radiation. It is one of
the contributing causes of
thermal discomfort. This is why we coined the phrase, "Radiant
Based HVAC" which draws attention to HVAC as being
predominantly controlled by the performance of the building
enclosure and not the air temperature.