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From the following data given for a spray dryer determine hot air flow rate and humidity of air at the exit of the dryer and quantity of fuel oil requirement for the air heater. TS in feed =41% Moisture content in product =3.5% Temp. of feed =45C Temp. of product at the exit of dryer =60C Feed rate =50000kg/hr Specific humidity of inlet air (33C,45%RH)=0.14kg water/ kg of dry air Inlet and exit air temperatures are 210C and 85C resp. Specific heat of feed =2.32kJ/kg Heat losses from the dryer is 2105kJ/h The calorific value of oil =42000kJ/kg, Heat transfer efficiency in the air heater =85%