Problem 2: Part B Water (4.18 kJ/kg-K) and air (1.005 kJ/kg-…

Problem 2: Part B Water (4.18 kJ/kg-K) and air (1.005 kJ/kg-K) flow through a cross-flow heat exchanger with both fluids unmixed. The water flows at 2.0 kg/s and decreases from 66 °C to 45 °C, and the air flows at 4.2 kg/s and enters the heat exchanger at 20 °C.   Using the ε-NTU method, determine the exit temperature of the air (°C)