A double-pipe heat exchanger is used to condense steam at 40°C saturation temperature. Water at an...

A double-pipe heat exchanger is used to condense steam at 40°C saturation temperature. Water at an average bulk temperature of 20°C flows at 2 m/s through the inner tube (copper, 2.54 cm ID, 3.05 cm OD). Steam at its saturation temperature flows in the annulus formed between the outer surface of the inner tube and outer tube of 6 cm ID. The average heat transfer coefficient of the condensing steam is 6,000 W/m² ? K, and the thermal resistance of a surface scale on the outer surface of the copper pipe is 0.000176 m² ? K/W. a. Determine the overall heat transfer coefficient between the steam and the water based on the outer area of the copper tube. b. Evaluate the temperature at the inner surface of the tube. c. Estimate the length required to condense 0.5 kg/s of steam.

Expert Solution

samet mamat answered 2 years ago

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