Mellcon engineers manufacture, heat of compression type air dryers which is a break through in drying technology. These air dryers are ideal for use in oil free compressor. A lot of energy is converted into heat in these air dryers while compression which is stored in the compressed air & is normally wasted in water cooled after cooler. In heat of compression dryer the energy can regenerate the desiccant which eliminates the need of heaters required in case of conventional air drying systems. The hot air from the compressor of these air dryers at 120 deg. C. Or more is used directly for regeneration of the desiccant. After regeneration, this air is cooled down to 40 deg. C. And then dried in second tower. Thus the use of heaters is eliminated. These compressed heat type air dryers operate in 4+4 hrs cycle where hot air is fed for regeneration for 2 hrs and for balance 2 hrs a changeover takes place where the air is first cooled in cooler, then dried and before going to the outlet, cools the regenerated desiccant bed thus bringing it down to ambient temperature. This cycle is reversed for the next 4 hours where the adsorber drying the air in previous cycle goes for regeneration and vice versa. These air dryers come with advantage of zero power consumption and better dew point.