Majority of heat from a flame is convective -- not radiant -- that is why flames are hottest on top.

Posted by GreenXenon on May 8, 2009, 12:33 am

wrote:

> Everyone knows, Heat rises...

Natural convective heat rises. Radiant, conductive, and forced-
convection heat don't necessarily.

A fan is an example of forced convection.

> Here, hold this piece of charcoal...

No thanks, the conductive heat will hurt badly.

> Heat seeks cold in all directions...

Natural convection heating doesn't, it only goes up. The other 3 do
seek cold in all directions.

> That's why you insulate below radiant
> floors.
> Earth averages 55dF & your floor is 80dF...? heat rises right? I don't need
> that insulation!!!

Radiant heat does not necessarily rise. As with conductive heat, it
simply tries to take the shortest path to the cold.

Posted by HVAC on May 8, 2009, 11:23 am

> Everyone knows, Heat rises...

Heat does not rise.

Cooled air falls, warmed air rises.

--
Build a fire for a man, he's warm for a day.
*Set* a man on fire, he's warm for the rest of his life.

Posted by HVAC on May 8, 2009, 11:20 am

> Fire consists of hot gases that move upwards.

Fire is an exothermic plasma.

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Majority of heat from a flame is convective -- not radiant -- that is why flames are hottest on top. - Page 2