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Oil is being cooled from 180°F to 120°F in a 1-shell and 2-tube heat exchanger with an overall heat transfer coefficient of 40 Btu/h.ft2 .°F. Water (cpc = 1.0 Btu/lbm.°F) enters at 80°F and exits at 100°F with a mass flow rate of 20,000 lbm/h, determine (a) the NTU value and (b) the surface area of the heat exchanger.
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