A laundry dryer comprising: • a casing supporting a drying chamber for receiving a load to be dried and having a basement A process air conduit in communication with the drying chamber where an air process stream is apt to flow; • a heat pump having a heat pump circuit in which a refrigerant can flow, said heat pump circuit including a first heat exchanger where the refrigerant is cooled off and the process air stream is heated up, and a second heat exchanger where the refrigerant is heated up and the process air is cooled off; said first and/or second heat exchanger being thermally coupled to the process air conduit to perform heat exchange between said refrigerant flowing in said heat pump circuit and said process air stream; said first and/or second heat exchanger (31; 32) further comprising a heat exchanger module (10; 10'), said heat exchanger module (10, 10') including • an inlet header (5; 5') to direct a flow of said refrigerant into said heat exchanger module (10, 10'); • an outlet header (6; 6') to discharge said refrigerant from said heat exchanger module (10, 10'); and • a plurality of channels (7; 7') extending along a longitudinal direction connecting said inlet header (5;5') to said outlet header (6; 6') to enable said refrigerant to flow from said inlet header (5, 5') to said outlet header (6, 6') and/or vice versa; said plurality of channels (7; 7') being at least in part subject to the flow of said air process stream; • characterized in that said module (10; 10') includes a plurality of adjacent channels forming a channels layer (8;8'), in that said module includes a plurality of said layers (8;8'), said channels layers (8,8') being stacked in a stackwise direction one on top of the other(s); and in that fins are located between adjacent channels layers (8, 8'). • a casing supporting a drying chamber for receiving a load to be dried and having a basement A process air conduit in communication with the drying chamber where an air process stream is apt to flow; • a heat pump having a heat pump circuit in which a refrigerant can flow, said heat pump circuit including a first heat exchanger where the refrigerant is cooled off and the process air stream is heated up, and a second heat exchanger where the refrigerant is heated up and the process air is cooled off; said first and/or second heat exchanger being thermally coupled to the process air conduit to perform heat exchange between said refrigerant flowing in said heat pump circuit and said process air stream; • an inlet header (5; 5') to direct a flow of said refrigerant into said heat exchanger module (10, 10'); • an outlet header (6; 6') to discharge said refrigerant from said heat exchanger module (10, 10'); and • a plurality of channels (7; 7') extending along a longitudinal direction connecting said inlet header (5;5') to said outlet header (6; 6') to enable said refrigerant to flow from said inlet header (5, 5') to said outlet header (6, 6') and/or vice versa; said plurality of channels (7; 7') being at least in part subject to the flow of said air process stream; • characterized in that said module (10; 10') includes a plurality of adjacent channels forming a channels layer (8;8'), in that said module includes a plurality of said layers (8;8'), said channels layers (8,8') being stacked in a stackwise direction one on top of the other(s); and in that fins are located between adjacent channels layers (8, 8').