Practice problems for Convective Heat Transfer
10. Water enters a 2.5-cm-internal-diameter thin copper tube of a heat exchanger at 15°C at a rate of 0.3 kg/s, and is heated by steam condensing outside at 120°C. If the average heat transfer coefficient is 800 W/m2 oC, determine the length of the tube required in order to the water to 115°C (see figure below).
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