Question

In a spray dryer operation, milk powder with a moisture content of 4 %wt is produced by dehydrating liquid milk with an initial moisture content of 90 %wt. Hot air for the drying process was generated by drawing and heating the ambient air, initially at 25 ˚C with a relative humidity of 70 % at a mass flow rate of 1000 kg/hr.  The ambient air was heated to 114˚C.  Assuming an adiabatic drying process and the exit air with a relative humidity of 80 %, calculate the production rate of the milk powder (in kg/hr).

Answer 1

using given data and mass balance with phychrometric chart we can find the production rate

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