Water is boiled at 150ºC in a boiler by hot exhaust gases (cp = 1.05 kJ/kg•ºC) that enter the boiler at 540ºC at a rate of 0.4 kg/s and leaves at 200ºC. The surface area of the heat exchanger is 0.64 m2. The overall heat transfer coefficient of this heat exchanger is
(a) 880 W/m2•ºC
(b) 1120 W/m2•ºC
(c) 1350 W/m2•ºC
(d) 2120 W/m2•ºC
(e) 1840 W/m2•ºC
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