Cold water (cp = 4.18 kJ/kg•ºC) enters a heat exchanger at 15ºC at a rate of 0.5 kg/s where it is heated by hot air (cp = 1.0 kJ/kg•ºC) that enters the heat exchanger at 50ºC at a rate of 1.8 kg/s. The maximum possible heat transfer rate in this heat exchanger is
(a) 51.1 kW
(b) 63.0 kW
(c) 66.8 kW
(d) 73.2 kW
(e) 80.0 kW
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