A manufacturer makes absorber plates that areCES 1.2 m X 0.8 m in size for use in solar collectors.9-37The back side of the plate is heavily insulated, while its frontsurface is coated with black chrome, which has an absorptivityof 0.87 for solar radiation and an emissivity of 0.09. Considersuch a plate placed horizontally outdoors in calm air at 25°C.Solar radiation is incident on the plate at a rate of 600 W/m².Taking the effective sky temperature to be 10°C, determine theequilibrium temperature of the absorber plate. What would youranswer be if the absorber plate is made of ordinary aluminum platethat has a solar absorptivity of 0.28 and an emissivity of 0.07?Evaluate air properties at a film temperature of 70°C and 1 atmpressure. Is this a good assumption?Solar radiation600 W/m2Absorber platea, = 0.878 = 0.09Insulation

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A manufacturer makes absorb 1.2 m X 0.8 m in size for use side of the plate is heavily insulat coated with black chrome, which l

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

A manufacturer makes absorber plates that are
CES 1.2 m X 0.8 m in size for use in solar collectors.
9-37
The back side of the plate is heavily insulated, while its front
surface is coated with black chrome, which has an absorptivity
of 0.87 for solar radiation and an emissivity of 0.09. Consider
such a plate placed horizontally outdoors in calm air at 25°C.
Solar radiation is incident on the plate at a rate of 600 W/m².
Taking the effective sky temperature to be 10°C, determine the
equilibrium temperature of the absorber plate. What would your
answer be if the absorber plate is made of ordinary aluminum plate
that has a solar absorptivity of 0.28 and an emissivity of 0.07?
Evaluate air properties at a film temperature of 70°C and 1 atm
pressure. Is this a good assumption?
Solar radiation
600 W/m2
Absorber plate
a, = 0.87
8 = 0.09
Insulation

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