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CH-206: Transfer Processes-1
Department of Chemical Engineering, lIT Roorkee
1. The configuration
of a furnace
can be approximated
as an
equilateral triangular duct which is sufficiently long that the end
effects are negligible. The hot wall is maintained at T1= 900 K and
has an emissivity £1= 0.8. The cold wall is at T2 = 400K and has an
emissivity £2= 0.8. The third wall is redirecting zone for which Q3 =
O.Calculate the net radiation heat flux leaving the hot wall.
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2. Consider a cylindrical furnace with ro = H = 1 m. The top surface
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(surface-I) and the base surface (surface-2) of the furnace has
emissivities £1 = 0.8 and £2= 0.4, respectively and are maintained at 15
uniform temperatures T1= 700 K, T2= SOOK.The side surface closely -;::'-riJD
approximated as a black body and is maintained at a temperature of
T3 = 400 K. Determine the net rate of radiation heat transfer at each
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surface during steady operation and explain how these surfaces can
be maintained at specified temperature.
CD
3. Two square plate each 1 m by 1m are parallel to and directly
opposite each other at a distance 1m. The hot plate is at T1 = 800K
and has an emissivity £1= 0.8. The colder plate is at T2 = 600K and _
also has an emissivity £2 = 0.8. The radiation heat exchange takes
place between the plates as well as with a large ambient at T3 ~
300K through the opening between the plates. Calculate the net heat
transfer rate by radiation at each plate to the ambient.
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factor for this configuration can be constructed by the algebraic sum
of view factors, which can be determined from the standard chart.
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