Question: = 7 0 4 W m 2 Example 4 . 2 : Calculate the rate of heat transfer by radiation from an unlagged steam pipe,

=704Wm2
Example 4.2 : Calculate the rate of heat transfer by radiation from an unlagged steam pipe, 50mm, o.d. at 393K(120C) to air at 293K(20C).
Assume emissivity 'e' of 0.9.
=704Wm2 Example 4.2 : Calculate the rate of heat transfer by

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