The thermal efficiency of a single drum rotary dryer can usually reach ‌70% or more. This high efficiency benefits from its careful design and advanced technology application, in the drying process can minimize the waste of energy, at the same time, the waste heat in the waste gas can also be effectively used through the recovery device, thus further improving the energy efficiency.

Some efficient models of single drum rotary dryers, the thermal efficiency can even reach more than 80% ‌. In contrast, the thermal efficiency of a traditional single-cylinder dryer is only about 35%.
Thermal efficiency calculation method
The thermal efficiency of a single drum rotary dryer can be calculated by the following formula: ‌ thermal efficiency (η) = effective output energy (Q absorption)/input energy (Q discharge). Thermal efficiency represents the degree of heat utilization of the dryer, and is an important indicator to evaluate its performance.
When calculating, it is necessary to determine the effective output energy and the input energy. The effective output energy usually refers to the heat absorbed by the rotary dryer to dry the material and the heat required for the evaporation of water, while the input energy is the energy released by the complete combustion of the fuel consumed by the dryer. The specific calculation of these energies may involve many parameters, such as the initial moisture of the material, the final moisture, the temperature of the hot gas, the specific heat capacity of the hot gas, etc.