Examples

MoistAirTab™ Example 7 - Solids Drying

Example 7

A continuous hot air drying system is employed to remove 3,500 lb of moisture per hour from the solid stock being dried. The system consists of a low-head fan, a steam-heated air heater, and a rotary drum dryer. The ambient air, under the design condition of 68°F, 760 mmHg and a relative humidity of 40%, is pressurized by an axial fan unit to 775 mmHg. The fan unit has an adiabatic efficicency of 70%. The steam heater would preheat the to 175°F with a pressure drop of 10 mm Hg; The air emerges from the drier at 95°F, a pressure of 755 mm Hg and a relative humidity of 90%. Seek to define all process units involved in terms of energy requirement, sizing, and flow rates.

Solution

The solution is presented below as a table generated from Excel. The gray shaded areas represent the input data.