On Aug 9, 8:02 pm, .p.jm@see_my_sig_for_address.com wrote in
The overwhelming majority of heat emitted from a fire, is convective heat, not radiant heat. There is some radiant heat but it is very small compared to the convective heat.
Um, the human body can give of heat via radiation as well as conduction and convection. If you put your hand near a piece of extremely cold metal, you'll feel a perceptible amount of cold even if you don't touch the metal. This is an example of radiant cooling. There is a sharp difference in temperature between your hand and the cold metal. Physics wants to equalize the temperature and will attempt in whatever way possible to do so. If you are not touching the metal [a painful conductive cooling], then the next option to equalize the temperature is for your hand to emit IR radiation and warm the metal. In this case, your hand is the thermal radiator. Your hand emits radiant heat toward the cold metal.
To your hand, this is radiant cooling. For the cold metal, it is an example of radiant heating, because the IR radiation from your hand will warm up the metal.
Why not? What's wrong with dry convective heating?
What makes hot dry air impossible?