Water with a flow rate of 0.05 kg/s enters an automobile radiator at 400 K and...

  

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Water with a flow rate of 0.05 kg/s enters an automobile radiator at 400 K and leaves at 330 K. The water is cooled by air in cross flow which enters at 300 K at a mass flow rate of 0.75 kg/s. The overall heat transfer coefficient is 200 W/m²-K, and both sides of the heat exchanger are unmixed. Use the e-NTU method to find: (a) The required heat transfer surface area, A, (b) The air outlet temperature, To Water Th-400K m,=0.05kg/s Air T-300K mc=0.75kg/s Te.o Tro=330K Assumptions: (1) Negligible heat loss to surroundings and kinetic and potential energy changes, (2) Constant properties. Water: C= 4209 J/kg-K, Air: Cpe = 1007 J/kg-K %3! Water with a flow rate of 0.05 kg/s enters an automobile radiator at 400 K and leaves at 330 K. The water is cooled by air in cross flow which enters at 300 K at a mass flow rate of 0.75 kg/s. The overall heat transfer coefficient is 200 W/m²-K, and both sides of the heat exchanger are unmixed. Use the e-NTU method to find: (a) The required heat transfer surface area, A, (b) The air outlet temperature, To Water Th-400K m,=0.05kg/s Air T-300K mc=0.75kg/s Te.o Tro=330K Assumptions: (1) Negligible heat loss to surroundings and kinetic and potential energy changes, (2) Constant properties. Water: C= 4209 J/kg-K, Air: Cpe = 1007 J/kg-K %3!