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?
Convection is what causes the fire to point upwards. Hot air travels
up via convection. Put your hand below or on the side of a flaming
candle, you won't feel much heat [esp. below the below the flame].
However, if you place your hand above the candle, you get a painful
amount of heat. This is because most of the flame emits heat via
convection. Only a trace amount of the fire's heat is emitted through
Well I am not to argue with you, however any benefits that you are getting
from fire is radiant heat what ever goes up it is waste and yes it is
definitely hot strait above of it however I would not call it convection
Convection heat is consider your base board water or electric as long
you don't have forced air over but natural convection.
Fire consists of hot gases that move upwards. If it were radiant heat,
then the heat would not specifically move away from the source of
gravity. If you aim a butane torch downward, most of the heat will
still go up. If it were radiant heat, then it heat from the torch
would move downward.
What mechanism other than convection would cause the heat to go upward
as opposed to in all directions?
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