In a test on a steam condenser the rate of flow of cooling water was varied while the condensation temperature was maintained constant. The following results were obtained: Overall heat transfer...

In a test on a steam condenser the rate of flow of cooling water was varied while the condensation temperature was maintained constant. The following results were obtained: Overall heat transfer coefficient, U (kW/m²K) 2.7 2.98 3.39 3.59 Water velocity, V(m/s) 0.996 1.27 1.83 2.16 Assuming the surface coefficient on the water side to be proportional to V^0.8, determine from an appropriate graph the mean value of the steam side surface coefficient. The thickness of the metal wall is 1.22 mm and thermal conductivity of tube material is 0.111 kW/m K.