A tunnel drier is used to dry an organic paint pigment. 1000 Ibs/hr of pigment containing 10% water is to be dried up to 0.50% water. The pigment is passed counter current to air which enters at 760 mmHg, 140°F and 10% humidity. The leaving air is at 750 mmHg, 96°F and 70% humidity. What flowrate of air must be maintained? Note: entering air @ 760 mmHg and 170 F, H 0.012 lbs H2O/ lbs dry air leaving air at 750 mmHg. 95°F, H = 0.026 lbs H:O / Ibs dry air

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Steady State Model

The steady-state model typically states that the entire universe is always enlarging, although it balances a fixed average density and matter that is being constantly generated to make new galaxies, star forms at a similar rate that the previous ones get indistinguishable due to the growing range and velocity of recession.