Patent ID: 7624514

Claim:
A closed drying system, comprising: a vessel that includes a moisture-containing object and an air circulator; and a compression refrigeration cycle section that includes: a compressor; a heating condenser that supplies heat energy to the object through a bottom of the vessel to generate moisture-laden air, which contains moisture in water vapor removed from the object, by evaporation of the moisture of the object; a regulating condenser that adjustably exhausts waste heat out of the system; an evaporator that is located inside the vessel and removes the water vapor from the moisture-laden air by refrigeration; an expansion valve connected after a circulating passage that delivers coolant from the compressor through the heating condenser to the regulating condenser; and a sensor that detects a temperature of coolant immediately before the expansion valve, from which temperature information the regulating condenser keeps a coolant temperature before the expansion valve at a constant level, wherein the air circulator circulates air between the object and the evaporator within the vessel whereby moisture-removed air with latent heat removed will contact with the object.