A rotary dryer operating at atmospheric pressure dries 10 tons/day of wet grain at 70°F, from a moisture content of 10% to 1% moisture. The airflow is countercurrent to the flow of grain, enters at 225°F dry-bulb and 110°F wet bulb temperature and leaves at 125°F dry-bulb. See below Figure. Determine
(a) The humidity of the entering and leaving air if the latter is saturated:
FIGURE:

Transcribed Image Text:

Saturated Air 125° Tos Air -225° Tge 110° T9 Grain 10% H20 70°F Grain 1% H20 110° F