An insulated counter-flow heat exchanger is used to cool water coming from a manufacturing process. The water enters at 130°F and exits at 80°F, with a mass flow rate of 1.5 lbm/s. The water is cooled by air, which enters at 75°F and flows with a rate of 9.1 lbm/s. The pressure change of the air is negligible. Determine the exit temperature of the air and the entropy generation rate of the heat exchanger.
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