Comet’s HCD Honeycomb dehumidifiers have been built utilizing the “Rotating Honeycomb” principle. A rotor slowly turns while a cycle of dehumidification, regeneration, and cooling is repeated simultaneously. This drying system provides a constantly lower dewpoint than any desiccant, compressed air, vacuum, or other dryer available today. Because this unique system operates in continuous drying, it is able to maintain dewpoints of -50°F, continuously. A closed-loop circuit design eliminates the risk of moisture re-absorption and is suitable for polymer drying applications involving large quantities of hygroscopic material.