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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

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
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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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
Transcribed Image Text: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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