To cool a summer home without using a vapor-compression

Chapter 8, Problem 8.31

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To cool a summer home without using a vapor-compression refrigeration cycle, air is routed through a plastic pipe (k?0.15 W/m?K, Di?0.15 m, Do?0.17 m) that is submerged in an adjoining body of water.The water temperature is nominally at T??17C, and aconvection coefficient of ho?1500 W/m2?K is main-tained at the outer surface of the pipe.If air from the home enters the pipe at a temperature ofTm,i?29C and a volumetric flow rate ofi?0.025 m3/s, what pipe length Lis needed to provide a discharge tem-perature of Tm,o?21C? What is the fan power requiredto move the air through this length of pipe if its inner sur- face is smooth?

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