Prob. 1 : An electrical resistance heater with a f50Watt has a total exposed surface area of / Ft. It is designed to operate submerged in water under conditions leading to a surface coefficient of heat transfer h = 50 Btu /(hr. ft . 'D). The heater operates under steady state conditions in 100 of water. (a) Calculate the surface temperature of the heater under design conditions. (b) If the heater is mistakenly operated in 100 f air with surface coefficient of heat transfer h = Btu / ( hr. ft. "f ), determine the steady state surface temperature. ( c) Discuss the possible consequences of operating the heater in air. (1 Watt = 3.413 Btu/hr)