Patent ID: 9745690
Date: 2017-08-29
CPC Classifications: D06F

Claim:
1. A method for controlling an exhaust type clothes dryer in which ambient air introduced from an outside of a case is heated by a heater, the heated air is supplied to a drum to dry a target item, and air that has passed through the drum is discharged to the outside of the case through an exhaust duct, the method comprising: measuring, by a humidity sensor, relative humidity of air passing through an interior of the drum to sense a degree of dryness of the target item; and discharging, by a controller, air that has passed through the drum, or recirculating at least a portion of air that has passed through the drum back to the drum by comparing the degree of dryness of the target item with a predetermined reference value, wherein, in the recirculating of air, when the relative humidity at an outlet of the drum is higher than 87.5%, air is discharged from the drum without recirculating any of the air back to the drum, and when the relative humidity is equal to or lower than 87.5%, the portion of air recirculated to the drum increases as the relative humidity decreases, wherein the portion of air is increased in stages.