Hot water at 50C is routed from one building in whichit is
Chapter 7, Problem 7.56(choose chapter or problem)
Hot water at 50?C is routed from one building in whichit is generated to an adjoining building in which it isused for space heating. Transfer between the buildingsoccurs in a steel pipe (k?60 W/m?K) of 100- mmoutside diameter and 8-mm wall thickness. Duringthe winter, representative environmental conditionsinvolve air at T???5?C and V?3 m/s in cross flowover the pipe.(a) If the cost of producing the hot water is $0.10 perkW?h, what is the representative daily cost of heatloss from an uninsulated pipe to the air per meter ofpipe length? The convection resistance associatedwith water flow in the pipe may be neglected.(b) Determine the savings associated with applicationof a 10-mm-thick coating of urethane insulation(k?0.026 W/mK ? ) to the outer surface of the pipe
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