Question: Water is boiled at 150C in a boiler by hot exhaust gases (c p = 1.05 kJ/kg C) that enter the boiler at 400C

Water is boiled at 150°C in a boiler by hot exhaust gases (cp = 1.05 kJ/kg · °C) that enter the boiler at 400°C at a rate of 0.4 kg/s and leaves at 200°C. The surface area of the heat exchanger is 0.64 m2. The overall heat transfer coefficient of this heat exchanger is
(a) 940 W/m2 · K

(b) 1056 W/m2 · K

(c) 1145 W/m2 · K

(d) 1230 W/m2 · K

(e) 1393 W/m2 · K

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Heat And Mass Transfer Fundamentals And Applications 5th Edition by Yunus Cengel, Afshin Ghajar