WHAT IS AN EXHAUST HEATED PURGE DRYER?
These dryers are a derivative of the heatless dryer. By heating the dry purge air with a heater, they can extend the cycle time from minutes to hours and are classified as a heat reactivated dryer. They use about 6-8 percent of the process air for purge. They are a form of convection, although the reactivation heater is only really sized to heat the purge air to increase purge air efficiency.
