Question 3: A dryer must take up 400lb/h/hr of H2O. Entering fresh air at barometric pressure, 70F and 50% relative humidity is mixed with recycle air (R) at 140F and enters the dryer, leaving at 140F and 80% relative humidity ( P). What is the volume of R (at its conditions) per volume of P (at its conditions)? The barometer reads 14.62 psi, and P and R each are at 0.15 psig gauge pressure. The dew point of the air after the heater is 95F at 0.15 psig. [18]