Hot exhaust gases leaving an internal combustion engine at 400°C and 150 kPa at a rate of 0.8 kg/s is to be used to produce saturated steam at 200°C in an insulated heat exchanger. Water enters the heat exchanger at the ambient temperature of 20°C, and the exhaust gases leave the heat exchanger at 350°C. Determine
(a) The rate of steam production,
(b) The rate of energy destruction in the heat exchanger, and
(c) The second-law efficiency of the heat exchanger.

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Exh. gas 400°C 150 kPa 350°C HEAT EXCHANGER Sat. vap. 200 C Water 20°C