KHCN-Series air dryer uses compressed waste heat in non-oiling type of high capacity of air compressor as regenerator source, and is very epoch-making drying equipment that can reduce optimum electric power expenses because there is no purge air. This type enhances energy reduction effect with reduction of electric power expenses after filling adsorbent for low temperature and double-reduction through other dew point operation, therefore this is ideal air dryer for business place which consume a great deal of compressed air.