Cold water (c p = 4.18 kJ/kg K) enters a heat exchanger at 15C at a

Question:

Cold water (c_p = 4.18 kJ/kg · K) enters a heat exchanger at 15°C at a rate of 0.5 kg/s, where it is heated by hot air (c_p = 1.0 kJ/kg · K) that enters the heat exchanger at 50°C at a rate of 1.8 kg/s. The maximum possible heat transfer rate in this heat exchanger is
(a) 51.l kW

(b) 63.0 kW

(d) 73.2 kW

(e) 80.0 kW

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