"pete" wrote in message
...
: On Wed, 16 Sep 2009 15:24:10 +0100, Jerry wrote:
:
: "pete" wrote in message
: ...
:
: [ re Tungsten Filament bulbs and how they contribute to the
: heating of a room ]
:
: :
: : The problem with the heat from TF bulbs is that it's mostly
at
: ceiling
: : height, since that's where most bulbs hang from. What people
: need
: : is heat at body (whether seated or standing) height, to keep
: them warm.
:
: Not sure what you're trying to get at there (you might have
even
: been agreeing with me?), if the TF bulb helps to increase the
air
: temperature at ceiling level above that of the lower level
then
: more heat (quite possibly at a lower temperature) will remain
: were it *is needed* for longer - all heat rises eventually,
even
: heat given off by under floor heating eventually ends up at
: ceiling level if there is no other exit or means of heat
exchange
: such as cold surfaces or ambient air temperature IYSWIM.
:
: Well, if you have a 100W TF light suspended from the ceiling,
the heat
: from that bulb will rise to the top of the room. The occupants
won't get
: any direct benefit from that 100Watts. Not unless they're
exceptionally
: tall - in which case their heads will get a little warmer.

People do not heat their person but the room though...

: As you say, you may get some small improveent from that heat
adding to
: the temperature gradient in the room, but it won't be anything
like the
: 100Watts the bulb is putting out. You'd be far better off
putting in a
: CFL (or 6) and installing a small fan to move the warm air off
the ceiling
: if only temporarily, so that it can usefully warm the room's
occupants.

No you would not, the fan will actually cause the ambient
temperature to fail, due to the air movement, you will actually
need to use more heat to keep to the same ambient temperature!
Only use a fan if you have to either distribute heated (or cooled
air) or need air movement for other reasons.
--
Regards, Jerry.