Suppose the heat exchanger in Problem is uninsulated, with a surface maintained at 5°C. Determine a rate of heat transfer to the surroundings and a mass flow rate of water for which the heat exchanger would work.
Problem
An insulated heat exchanger is proposed to be used to cool hot air with a flow of cool water. The air enters at 200 kPa and 100°C, and exits at 195 kPa and 0°C. The mass flow rate of the air is 2.0 kg/s. The water enters the heat exchanger at 30°C and exits at 95°C. Calculate the entropy generation rate of the proposed heat exchanger. Is this heat exchange process possible?
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