Cold water (cp = 4.18 kJ/kg•ºC) enters a counter-flow heat exchanger at 10ºC at a rate of 0.35 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 1.9 kg/s and leaves at 25ºC. The effectiveness of this heat exchanger is
(a) 0.50
(b) 0.63
(c) 0.72
(d) 0.81
(e) 0.89
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