Water at 15°C is supplied to a one-shell-pass, two-tube-pass heat to cool 10 kg/s of liquid ammonia from 120°C to 40°C. You anticipate a U on the order of 1500 W/m2K when the water flows in the tubes. If A is to be 90m2, choose the correct flow rate of water.  Question from A Heat Transfer Textbook, 5th Edition, Problem 3.17

Elements Of Electromagnetics
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Water at 15°C is supplied to a one-shell-pass, two-tube-pass heat to cool 10 kg/s of liquid ammonia from 120°C to 40°C. You anticipate a U on the order of 1500 W/m2K when the water flows in the tubes. If A is to be 90m2, choose the correct flow rate of water. 

Question from A Heat Transfer Textbook, 5th Edition, Problem 3.17

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