Arnold Howard on tue 31 oct 06
From: "Maurice Weitman"
>>>As the temperature gets very high in the kiln,
>>>the smaller holes tend to be more restrictive and
>>>in fact, less air will go through...
>>
>>Could you elaborate on this? -Snail
Heat makes the air molecules move farther apart. At 1700 F,
a cubic foot of air has only about 1/10 the number of
molecules as at room temperature.
Therefore, the kiln vent draws less air out of the kiln at
high temperatures than it does at low temperatures. This can
be demonstrated with the match test.
This is the reason there is very little air flow in an
electric kiln at high temperatures. Heat no longer rises as
it does at low temperatures.
As the downdraft vent pulls air into the kiln, the
room-temperature air molecules spread out rapidly. It is an
intense, silent "explosion" of molecular activity as the
fresh air enters the firing chamber.
Sincerely,
Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
ahoward@paragonweb.com / www.paragonweb.com
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