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RADIANT FLOOR HEAT CONCEPTS
Summary by Solar Assist
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“Radiant” heat
relates to one of three of the most prevalent means that heat
is transferred. Radiant
heat is long wave infrared energy radiated from any “hot
body” to any “cooler body” within sight. In
other words, if you’re in the sun you’ll feel
warmer than if you’re in the shade. If you
can see a wood stove you’ll be warmer than if you
are around the corner from it. This is the concept
that makes radiant floor heat so comfortable; you’re
almost always “in sight” of your floor and
therefore warm. An added benefit is that not all
the energy from a radiant floor is from radiant heat, only
most of it, that’s why it categorized as radiant. Warm feet help
make warm homes.
Hydronic Radiant Floor Heating is
in the family of Hydronic Heating which includes hydronic
baseboards, radiators, fan convectors as well as radiant
walls and ceilings. All these are tied together by
the fact that the system relies upon a transfer medium
of water or a water based fluid and tubing that acts to
distribute the fluid to the heat emitters. Hydronic
heating has several advantages over other radiant heat
sources. What makes water based hydronic systems advantageous
is that they emit their energy independent of heat source.
Heat sources such as natural gas, propane, wood fire or
electricity may be used in conjunction with hydronic radiant
heating systems. The water distributes the heat energy;
the heat energy can be gotten from any source. At
any time in the future, due to energy supply or energy
cost issues, a hydronic systems heat source can be switched
to a more affordable or environmentally benign source. The
only partial exception to this general statement is that
if the system is not well designed from the start it might
have less potential for a complete switch. Careful
attention should be given to the home’s insulation
details, especially as it pertains to the floor (an integral
part of the heating system with radiant floor), and the
tubing detail. Once a tubing detail is chosen it is typically
permanent. A low temperature tubing detail can improve
comfort, efficiency, and allow for flexibility of heat
source into the future. Switching fully of partially
to an Air Source or Ground Source Heat Pump or a direct
solar source can only be accomplished with the correct
low temperature tubing detail. These sources will
be very effective as energy costs continue to trend upward.