A pipe (k = 59 W/m.K) with an I.D. of 3.175 cm and wall thickness of 0.318 cm is externally heated by steam at a temperature of 180°C. The water flows through the pipe with a velocity of 1.22 m/s....

A pipe (k = 59 W/m.K) with an I.D. of 3.175 cm and wall thickness of 0.318 cm is externally heated by steam at a temperature of 180°C. The water flows through the pipe with a velocity of 1.22 m/s. Calculate the length of the pipe required to heat water from 30°C to 90°C. Assuming the heat transfer coefficient on the steam side to be 11.3 kW/ m².K.