METHOD OF OPERATING A HEAT-PUMP DRYER

摘要

According to the invention a method for operating a heat-pump dryer (2) during a drying program is provided. The dryer comprises: a cabinet (4), a drum (16) arranged within the cabinet and being adapted to receive laundry (18) for drying the laundry within the drum using drying air, an air channel (20) adapted to guide the drying air from at least one air outlet (24) at the drum (16) to at least one air inlet (22) at the drum for providing an air circulation arrangement, a drying air fan (28) adapted to convey the drying air through the air circulation arrangement, a heat pump system (44) comprising a first heat exchanger (32) adapted to heat the drying air, a second heat exchanger (34) adapted to cool the drying air for humidity condensation, and a compressor (36) adapted to circulate refrigerant through the first and second heat exchangers, a temperature sensor adapted to detect a temperature (Tr) of the heat pump system (44), a motor (70) adapted to drive the drying air fan (28), and a motor (30) adapted to drive the drum (16) independent of the motor (70) driving the drying air fan (28). The method comprises: a) starting a drying program, b) monitoring the temperature (Tr) of the heat pump system, and c) if the temperature of the heat pump system is at or above a first threshold value (Tr), setting, at least for one or more periods of the drying program, the rotation speed (D) or the maximum rotation speed of the drum (16) in dependency of the temperature (Tr) of the heat pump system.