... ensure 4.8 second contact time, enough to dry saturated air at the dryer inlet to the desired dew point.B, 30% extra ... of adsorption, stored heat maintains purge air temperature during regeneration, maximizing the purge air's ability to carry off moisture, minimizing the ... , energy not wasted when wet air travels through dry desiccant. C,Ability to match purge air use to the demand on the dryer. ...