A shell-and-tube heat exchanger consisting of one shell

Chapter , Problem 11.72

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A shell-and-tube heat exchanger consisting of one shell pass and two tube passes is used to transfer heat from an ethylene glycolwater solution (shell side) supplied from a rooftop solar collector to pure water (tube side) used for household purposes. The tubes are of inner and outer diameters Di 3.6 mm and Do 3.8 mm, respectively. Each of the 100 tubes is 0.8 m long (0.4 m per pass), and the heat transfer coef- ficient associated with the ethylene glycolwater mixture is ho 11,000 W/m2 K. (a) For pure copper tubes, calculate the heat transfer rate from the ethylene glycolwater solution (m . 2.5 kg/s, Th,i 80C) to the pure water (m . 2.5 kg/s, Tc,i 20C). Determine the outlet temperatures of both streams of fluid. The density and specific heat of the ethylene glycolwater mixture are 1040 kg/m3 and 3660 J/kg K, respectively. (b) It is proposed to replace the copper tube bundle with a bundle composed of high-temperature nylon tubes of the same diameter and tube wall thickness. The nylon is characterized by a thermal conductivity of kn 0.31 W/mK. Determine the tube length required to transfer the same amount of energy as in part (a). 11.73

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