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 (R) 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 fluidly connecting said inlet (5;5') to said outlet header (6;6') to enable said refrigerant (R) to flow from said inlet to said outlet header and/or vice versa; said layers being stacked one on top of the others and each layer including a plurality of channels; characterized in that said heat exchanger module 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 (R) 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 fluidly connecting said inlet (5;5') to said outlet header (6;6') to enable said refrigerant (R) to flow from said inlet to said outlet header and/or vice versa; said layers 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 fluidly connecting said inlet (5;5') to said outlet header (6;6') to enable said refrigerant (R) to flow from said inlet to said outlet header and/or vice versa; said layers being stacked one on top of the others and each layer including a plurality of channels; <EOS>