Question
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A flat furnace wall is constructed of a 4.5 in (114 mm) layer of Silo-cel brick,...
A flat furnace wall is constructed of a 4.5 in (114 mm) layer of Silo-cel brick, with a thermal conductivity of 0.08 Btu/ft·h·˚F (0.138 W/m·˚C), backed by a 9-in. (229-mm) layer of common brick, of conductivity 0.8 Btu/ft·h·˚F(1.38 W/m.˚C). The temperature of the inner face of the wall is 1400˚F (760˚C), and that of the outer face is 170˚F(76.6˚C).
(a) What is the heat loss through the wall?
(b) What is the temperature of the interface between the refractory brick and the common brick?
(c) Supposing that the contact between the two brick layers is poor and that a “contact resistance” of 0.50˚F·ft2.h/Btu (0.088˚Cm2/W) is present, what would be the heat loss?
Solutions
Amanda K answered 1 year agoRelated Solutions
A furnace wall is constructed of an inner layer of 10 mm of material A with...
A furnace wall is constructed of an inner layer of 10 mm of
material A with kA = 20W/mK, 20 mm of material
B with kB = 1.5 W/mK, a middle layer of 30 mm
of material C with kC=3.0 W/mK) , and an outer
layer of 40 mm of material D (kD=300 W/mK) .
The temperature of inside wall is 1000 K and the temperature of
outer layer is 350 K. The temperature and convection coefficient of
hot air...
The composite wall of a building consists of a 100 mm layer of common brick, a...
The composite wall of a building consists of a 100 mm layer of
common brick, a 100 mm layer of glass fibre (organic bonded), a 10
mm layer of gypsum plaster (perlite aggregate) and a 6 mm of pine
panel. If the inside convection coefficient is 10 W/m2 .K and the
outside convection coefficient is 70 W/m2 .K, calculate: (i) the
total thermal resistance of the wall; (ii) the overall heat
transfer coefficient of the wall.
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