Radiation from the atmosphere or sky can be esti-mated as

Fundamentals of Heat and Mass Transfer | 0th Edition | ISBN: 9780470501979 | Authors: 7

Problem 12.119 Chapter 12

Fundamentals of Heat and Mass Transfer | 0th Edition

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Fundamentals of Heat and Mass Transfer | 0th Edition | ISBN: 9780470501979 | Authors: 7

Fundamentals of Heat and Mass Transfer | 0th Edition

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Problem 12.119

Radiation from the atmosphere or sky can be esti-mated as a fraction of the blackbody radiation corre-sponding to the air temperature near the ground, Tair.That is, irradiation from the sky can be expressed asand for a clear night sky, the emis-sivity is correlated by an expression of the form?sky?0.741?0.0062Tdp, where Tdpis the dew pointtemperature (C). Consider a flat plate exposed to the night sky and in ambient air at 15C with a rela-tive humidity of 70%. Assume the back side of theplate is insulated, and that the convection coefficienton the front side can be estimated by the correlation, where Tis the absolutevalue of the plate-to-air temperature difference. Willdew form on the plate if the surface is (a) clean andmetallic with ?? 0.23, and (b) painted with ??0.85?

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Textbook: Fundamentals of Heat and Mass Transfer
Edition: Theodore L. Bergman
Author: 7
ISBN: 9780470501979

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