1) 2.5 m3/s of air at 150°C is used to heat 0.342 kg/s of 20°C water....

Question:

1) 2.5 m3/s of air at 150°C is used to heat 0.342 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 Crezia = 1.005 kJ/(kgº), Crewater = 4.2 kJ/(kg °C). 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 E = (+ 0.01) C. the net heat transfer from the hot air. II kW (+0.5 kW) d. the exit temperature of the air. Thexit = °C (+ 0.5 °C)

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