Whey powders are used as food ingredients in many applications. Defatted and demineralized whey concentrate (30% total solids) enters the spray drying chamber at a rate of 100kg/min at 20C. The total solid content of the dry powder product is 95%. The air entering the dryer is at 120C that is obtained by heating the ambient air with humidity of 0.001kg water /kg BDA at 25C. the exit air temperature is 60C with 4% RH after drying. a. Calculate the heating requirement of heat exchanger as kJ/kg BDA by considering negligible heat loss. b. Determine humidity, Twb and Tdp of the air leaving the dryer. c. Calculate the flow rate of BDA (kgBDA/min). d. If the exit product temperature is 35C, Calculate the heat loss from the dryer