Patent ID: 7073273

Claim:
A low temperature dryer, comprising: a drum unit having a drum for containing the washing, wherein the drum rotates; a circulation duct that communicates one side and the other side of the drum unit; a refrigerator, wherein the refrigerator comprises an dehumidification evaporator disposed at one side within the circulation duct, the dehumidification evaporator dehumidifying air passing through it, a compressor for compressing a coolant via the dehumidification evaporator and a condenser for discharging heat of the coolant via the compressor; a first heater disposed at the other side within the circulation duct for heating air passing through it; a blowing fan connected to the circulation duct, wherein the blowing fan allows the air discharged from the drum unit to pass through the dehumidification evaporator and the first heater and to be introduced into the drum unit again; a drain valve for discharging the water dehumidified by the dehumidification evaporator toward the outside; and an exhaust duct that communicates with one side of the drum unit and communicates with the outside, a suction duct that communicates with the other side of the drum unit and communicates with the outside, a suction fan for generating a suction pressure that introduces air into the drum unit through the suction duct and discharges it to the exhaust duct, and first and second valves and disposed in the exhaust duct and the suction duct, respectively, wherein the exhaust duct has a second heater for heating an introduced air.