Device for the drying of a product to be dried comprising: - a chamber comprising: ∘ an inlet intended to receive a product and an outlet intended to discharge said product , and a member for moving the product between the inlet and the outlet , and ∘ a circuit for circulating drying gas between a main inlet and a main extraction , - at least one heat pump comprising at least one condenser and at least one evaporator , characterised in that - the device comprises a number of drying zones at least equal to two, the drying zones being arranged in series between the inlet and the outlet of the product , such that each drying zone is configured to be the base of a drying cycle, - each zone comprising an inlet opening and an outlet opening for the drying gas, the outlet opening of a zone being fluidically connected to the inlet opening of the zone which itself is adjacent so as to let the drying gas pass between these two zones , - the number of condensers of the heat pump is less than the number of zones, - the device comprises an intermediate heating circuit , configured to transfer the heat from the condenser to the drying gas at the inlet of each zone and comprising two first intermediate exchangers , an exchanger being disposed facing the condenser at the heat pump and another exchanger being disposed at the gas inlet opening of a zone, - the device comprises an intermediate recovery circuit configured to transfer the heat from the drying gas at the outlet of at least one zone to the evaporator and comprising two second intermediate exchangers , an exchanger being disposed facing the evaporator at the heat pump and another exchanger being disposed at the gas outlet opening of a zone. - a chamber comprising: ∘ an inlet intended to receive a product and an outlet intended to discharge said product , and a member for moving the product between the inlet and the outlet , and ∘ a circuit for circulating drying gas between a main inlet and a main extraction , ∘ an inlet intended to receive a product and an outlet intended to discharge said product , and a member for moving the product between the inlet and the outlet , and ∘ a circuit for circulating drying gas between a main inlet and a main extraction , - at least one heat pump comprising at least one condenser and at least one evaporator , - the device comprises a number of drying zones at least equal to two, the drying zones being arranged in series between the inlet and the outlet of the product , such that each drying zone is configured to be the base of a drying cycle, - each zone comprising an inlet opening and an outlet opening for the drying gas, the outlet opening of a zone being fluidically connected to the inlet opening of the zone which itself is adjacent so as to let the drying gas pass between these two zones , - the number of condensers of the heat pump is less than the number of zones, - the device comprises an intermediate heating circuit , configured to transfer the heat from the condenser to the drying gas at the inlet of each zone and comprising two first intermediate exchangers , an exchanger being disposed facing the condenser at the heat pump and another exchanger being disposed at the gas inlet opening of a zone, - the device comprises an intermediate recovery circuit configured to transfer the heat from the drying gas at the outlet of at least one zone to the evaporator and comprising two second intermediate exchangers , an exchanger being disposed facing the evaporator at the heat pump and another exchanger being disposed at the gas outlet opening of a zone. <EOS>