Why
is Radiant Heat More Energy Efficient?
The
3 Modes of Energy Transfer:
conduction, convection and radiant heat (radiation)
CONDUCTION
is direct heat flow through matter (example: conduction of heat
from the warm surface of a stove to a cooking pot.)
CONVECTION
is the transport of heat within the air. The heat travels upward
to the ceiling, with the natural upward movement of air.
RADIATION
is the transmission of electromagnetic rays through space. These
rays have no temperature, only energy. Every material or object
with a temperature above absolute zero emits these rays in all
directions until they are deflected or absorbed.

Even though
traditional heating systems use the convection mode, radiation
is the most efficient of the three heat transfer modes. Convection
is secondary and come into play only as matter interrupts or interferes
with radiant heat transfer. Radiant heat allow savings up to
50% compared to other heating systems.
Radiant heat
is probably the most comfortable and energy efficient form of
heating.
To better
understand how radiant heating works, picture yourself working
outside in the shade on a cool day: taking a break, you walk out
of the shade and into the sunlight and soak up some rays. You
begin to warm up even though the air temperature around you is
the same as when you were in the shade. The heat you feel from
the sun is radiant heat.
This description
illustrates how you can be warm and comfortable even when the
air temperature is cooler.
"You
can feel the heat of a campfire even though you are not directly
above it. Radiant heat transfer is caused by a warm surface
(the campfire) giving up its heat to a cooler surface (your
body). This radiant energy travels through space without heating
the space itself. It only turns into heat when it contacts a
cooler surface.
The
interesting thing is that our human comfort relies just as much
on radiant heat transfer as it does on air temperature, yet the
majority of heating and air-conditioning professionals think only
in terms of air temperature. As a result, Americans are missing
out on a truly comfortable living environment in their own homes
or places of business"
Lawrence
V. Drake, RPA Executive Director
More
information on radiant heat?
