Hot water at 50 ℃ is routed from one building in which it is generated to an adjoining building in which it is used for space heating. Transfer between the buildings occurs in a steal pipe (k = 60W/m ∙ K) of 100-mm outside diameter and 8-mm wall thickness. During the winter, representative environmental conditions involve air at T[infinity] = −5℃ and V = 3m/s in cross flow over the pipe. Account for the convection resistance associated with water flow at a mean velocity of um = 0.5m/s in the pipe. What is the heat loss per unit length of pipe?