A laundry dryer comprising: a. a casing supporting a drying chamber for receiving a load to be dried; b. A process air conduit in communication with the drying chamber where a process air stream is apt to flow, the air process circuit being a closed loop circuit; c. 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 module including • An inlet header (5;5') to direct a flow of said refrigerant into said module; • an outlet header (6;6') to discharge said refrigerant from said module; and • a plurality of heat exchange layers (8,8') fluidly connecting said inlet (5;5') to said outlet header (6;6') to enable said refrigerant to flow from said inlet to said outlet header and/or vice versa; said layers (8,8') being stacked one on top of the others and each layer including a plurality of channels; characterized in that said heat exchanger module (10,10') includes at least a first and a second couple of adjacent heat exchange layers (8 12, 8 21; 8 21, 8 22; 8 11, 8 31; 8 31, 8 32; 8 22, 8 41) along said stackwise direction, a distance (D1, D2, D3) between the two adjacent heat exchange layers of said first couple being different than a distance (D1, D2, D3) between the two adjacent heat exchange layers of said second couple. a. a casing supporting a drying chamber for receiving a load to be dried; b. A process air conduit in communication with the drying chamber where a process air stream is apt to flow, the air process circuit being a closed loop circuit; c. 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 module including • An inlet header (5;5') to direct a flow of said refrigerant into said module; • an outlet header (6;6') to discharge said refrigerant from said module; and • a plurality of heat exchange layers (8,8') fluidly connecting said inlet (5;5') to said outlet header (6;6') to enable said refrigerant to flow from said inlet to said outlet header and/or vice versa; said layers (8,8') being stacked one on top of the others and each layer including a plurality of channels; • An inlet header (5;5') to direct a flow of said refrigerant into said module; • an outlet header (6;6') to discharge said refrigerant from said module; and • a plurality of heat exchange layers (8,8') fluidly connecting said inlet (5;5') to said outlet header (6;6') to enable said refrigerant to flow from said inlet to said outlet header and/or vice versa; said layers (8,8') being stacked one on top of the others and each layer including a plurality of channels;