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###### Heat transfer 1) 2.5 m/s of air at 150°C is used to heat (0.25 + /250)=0.254...

Heat transfer

1) 2.5 m/s of air at 150°C is used to heat (0.25 + /250)=0.254 kg/s of 20°C water. The heat exchanger is a finned-tube cross flow heat exchanger with both sides unmixed. The overall heat transfer coefficient associated with the hot side is 120 W/(m2 °C). The hot-side area is 20 m². Assume a constant specific heat for air and water of Cecair = 1.005 kJ/(kg °C), Crewater = 4.2 kJ/(kg). The pressure of the hot air is P = 1.0 atm. The pressure of the water is high enough so that it does not boil. Find the following: NTU= (+0.01) a. the NTU for the heat exchanger b. the effectiveness of the heat exchanger € (+ 0.01) C. the net heat transfer from the hot air. q= kW (+0.5 kW) d. the exit temperature of the air. Thexit = C(+ 0.5))

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