A METHOD FOR CONTROLLING A LAUNDRY DRYING MACHINE OF THE TYPE COMPRISING A HEAT PUMP SYSTEM AND A CORRESPONDING LAUNDRY DRYING MACHINE

摘要

The present invention relates to a method for controlling a drying cycle in a laundry drying machine (1) of the type comprising a heat pump system (20) having a refrigerant circuit (30) for a refrigerant and comprising a drying air circuit (10) for conveying a volume flow of drying air (A) in a laundry drum (9) suitable for receiving laundry to be dried. The refrigerant circuit (30) comprises: a compressor (24) with a variable rotation speed (Cs); a first heat exchanger (21) for a thermal coupling between the drying air circuit (10) and the refrigerant circuit (30) and a second heat exchanger (23) for a further thermal coupling between the drying air circuit (10) and the refrigerant circuit (30). The method comprises an optimization procedure comprising the step of controlling the rotation speed (Cs) or the power (Cp) of the compressor (24) during a plurality of time intervals (Δtn-2; Δtn-1-; Δtn) of the drying cycle. The optimization procedure comprises the steps of: determining an efficiency parameter (F(tn-1)) related to the amount of water removed from the laundry during a first time interval (Δtn-2); determining an efficiency parameter (F(tn)) related to the amount of water removed from the laundry during a second time interval (Δtn-1); comparing the efficiency parameter (F(tn)) determined during the second time interval (Δtn-t) with the efficiency parameter (F(tn-1)) determined during the first time interval (Δtn-2); adjusting the rotation speed (Cs) or the power (CP) of the compressor (24) in a third time interval (Δtn) according to the result of said comparison.