Assembly for dehumidifying granular bulk material of plastic, comprising: • at least one drying gas generator; • a control unit with a memory; • at least two drying systems, each drying system comprising: • a drying hopper (10, 10 1, 10 2,...10 N) which is connected to the drying gas generator via a first line for supplying dried gas from the drying gas generator and via a second line for discharging moisture-laden gas from the drying hopper (10, 10 1, 10 2,...10 N); • a heater which is arranged in the first line upstream of the drying hopper (10, 10 1, 10 2,...10 N); • a flow sensor which is provided in the first line to the drying hopper (10, 10 1, 10 2,...10 N); • a level sensor associated with a material separator of each drying hopper (10, 10 1, 10 2,...10 N); • a regulating flap for automatically adjusting the gas quantity to the drying hopper (10, 10 1, 10 2,...10 N); • respective first communication connections from the level sensor, from the heater and from the flow sensor to the control unit; and • respective second communication connections from the control unit to the heater and to the regulating flap for automatic adjustment of the gas quantity and its temperature to the drying hopper (10, 10 1, 10 2,...10 N); characterized in that the control unit is set up in such a way that the regulating flap and the heater in the first line to the respective drying hopper (10, 10 1, 10 2,...10 N) are controlled according to requirements depending on the regulating flap and the heater in the first line in such a way that the gas quantity and the temperature in the drying hopper (10, 10 1, 10 2,...10 N) with the highest throughput of bulk material are set in such a way that they correspond to the required target gas quantity and the target temperature. • at least one drying gas generator; • a control unit with a memory; • at least two drying systems, each drying system comprising: • a drying hopper (10, 10 1, 10 2,...10 N) which is connected to the drying gas generator via a first line for supplying dried gas from the drying gas generator and via a second line for discharging moisture-laden gas from the drying hopper (10, 10 1, 10 2,...10 N); • a heater which is arranged in the first line upstream of the drying hopper (10, 10 1, 10 2,...10 N); • a flow sensor which is provided in the first line to the drying hopper (10, 10 1, 10 2,...10 N); • a level sensor associated with a material separator of each drying hopper (10, 10 1, 10 2,...10 N); • a regulating flap for automatically adjusting the gas quantity to the drying hopper (10, 10 1, 10 2,...10 N); • respective first communication connections from the level sensor, from the heater and from the flow sensor to the control unit; and • respective second communication connections from the control unit to the heater and to the regulating flap for automatic adjustment of the gas quantity and its temperature to the drying hopper (10, 10 1, 10 2,...10 N); • a drying hopper (10, 10 1, 10 2,...10 N) which is connected to the drying gas generator via a first line for supplying dried gas from the drying gas generator and via a second line for discharging moisture-laden gas from the drying hopper (10, 10 1, 10 2,...10 N); • a heater which is arranged in the first line upstream of the drying hopper (10, 10 1, 10 2,...10 N); • a flow sensor which is provided in the first line to the drying hopper (10, 10 1, 10 2,...10 N); • a level sensor associated with a material separator of each drying hopper (10, 10 1, 10 2,...10 N); • a regulating flap for automatically adjusting the gas quantity to the drying hopper (10, 10 1, 10 2,...10 N); • respective first communication connections from the level sensor, from the heater and from the flow sensor to the control unit; and • respective second communication connections from the control unit to the heater and to the regulating flap for automatic adjustment of the gas quantity and its temperature to the drying hopper (10, 10 1, 10 2,...10 N);