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A shell-and-tube heat exchanger consisting of oneshell pass and two tube passes is used to transfer heat from an ethylene glycol—water solution (shell side)supplied from a rooftop solar collector to pure water(tube side) used (or household purposes. The tubes areof inner and outer diameters
(a) For pure copper tubes, calculate the heat transferrate from the ethylene glycol—water solution
(b) It ¡s proposed to replace the copper tube bundlewith a bundle composed of high-temperature
nylon tubes of the same diameter and tube wall thickness. The nylon is characterized by a thermalconductivity of
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