A furnace wall is to be designed to
transmit a maximum heat flux of 200 Btu/h ft2 of wall area. The
inside and outside wall temperatures are to be 2000 and 300F, respectively.
Determine the most economical arrangement of bricks measuring 9 by by 3 in. if they
are made from two materials, one with a k of 0.44 Btu/h ftF and a maximum
usable temperature of 1500F and other with a k
of 0.94 Btu/h ftF
and a maximum usable temperature of 2200 F. Bricks made of
each material cost the same amount and may be laid in any manner.
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