A solution with a boiling point of 82C boils on the outside of a 2.5-cm tube with

A solution with a boiling point of 82ºC boils on the outside of a 2.5-cm tube with a No. 14 BWG gauge wall. On the inside of the tube flows saturated steam at 420 kPa (abs). The convection heat transfer coefficients are 8.5 kW/(m² K) on the steam side and 6.2 kW/(m² K) on the exterior surface. Calculate the increase in the rate of heat transfer if a copper tube is used instead of a steel tube.