In an old boiler, water is heated by flowing through a heat exchanger through which pass combustion products at a temperature of 1100 R. The water boils at a temperature of 250°F. The water flows through the boiler at a rate of 1.5 lbm/s. Assume that the temperature of the combustion gases does not drop through the heat exchanger. What is the rate of entropy change of the water, and what is the rate of entropy change of the combustion gases? Is the process reversible?
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