A water-soaked 10 cm × 10 cm square sponge is experiencing parallel dry air flow over its...

A water-soaked 10 cm × 10 cm square sponge is experiencing parallel dry air flow over its surface. The average convection heat transfer coefficient of dry air at 20°C flowing over the sponge surface is estimated to be 30 W/m2-K, and the sponge surface is maintained at 30°C. If the sponge is placed under an array of radiant lamps, determine (a) the rate of evaporation of water from the sponge and (b) the net radiation heat transfer rate.