Answered: Investigation shows that the…

Investigation shows that the reflectivity of this object is 0.2 for radiation at wavelengths less than 3.3 μm and 0.95 for radiation greater than 3.3 μm.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.61P

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Question

An engineer is investigating objects that can be used as a solar collector. One of
the objects considered is the object made of aluminum and is coated with lead
sulfate. Investigation shows that the reflectivity of this object is 0.2 for radiation
at wavelengths less than 3.3 μm and 0.95 for radiation greater than 3.3 μm. In
order to get better insight into the behavior of the object, as a candidate for a
solar absorber, the object is then exposed to two different conditions: a solar
radiation (T ~ 5800 K) and a room temperature (T ~ 300 K). What is the energy
reflected by the object at these two conditions?

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