A 3-meter high room is heated through a vertical steam pipe. If the bulk temperature of steam in the room was 25 degrees Celsius when the steam in the pipe is 98 degrees Celsius. Determine the minimum dimension of the pipe that could generate a power of 725 W if the pipe is (a) square and (b) circular. 

 

Answer:

(a) side of the square cross section should be more than 9.635 cm.

(b) radius of cross section should be more than 6.134 cm

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