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firing half load - not good for the wallet

updated mon 10 aug 09


May Luk on sun 9 aug 09

Hello all;=3D0A=3D0AMy usual firing (cone 8-9) in a 5.10 cu. ft / 144.42 li=
kiln is usually about $32 (38 cents per kilowatt) =3D0A=3D0AMy last firing=
a rush job, so I only have half load (but there are really 30% wares and a=
lot of shelves) to fire. I lifted the bottom shelve so that the wares are =
in the middle of the kiln. (10" off the ground and 12" of nothing on the to=
p) The firing cost was $30 - almost the same as the full load. Is this bec=
ause I'm heating air? I have noticed that if I have a lot of shelves, like =
a kiln load of shallow plates, the firing cost is $2-3 higher. =3D0A=3D0ASo=
mes, I fancy getting those thin expensive shelves to see how much money and=
energy I can save but $250 a shelf out lay is just too much.=3D0A=3D0AAlso=
, my=3D
glaze did not come out as nice in the half load. The cone pack read the sa=
me though.=3D0A=3D0AI'm learning the best economic way to make sure the hea=
k is on the ceramics, not the kiln wall, kiln furniture or air. All suggest=
ions welcome.=3D0A=3D0ABest Regards=3D0AMay=3D0ABrooklyn NY=3D0A=3D0A=3D0A=