Water enters a 3 cm diameter inner copper pipe of a heat exchanger with a temperature of 18oC and a flow rate of 20 kg / min. The pipe is heated by condensing steam at 110 oC. If the total length of the pipe used in the heat exchanger is 80 m, to increase the water to 90 oC at the exit: What will be the heat coefficient of the pipe transmitted h (W / m2K)

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