The most popular and economical type of roaster is a commercial drum coffee roaster. This roaster machine features a solid drum that rotates over a gas flame to heat the coffee beans. The beans receive both conductive heat transfer by making direct contact with the surface of the drum and convection heat transfer from the ambient air inside the drum. Drum roasters have paddles inside the drum to mix the beans as the drum rotates and ensure they receive the right blend of conductive and convective heat.
Drum coffee roasters come in two types: single-wall drums and double-wall drums. A single-wall drum roaster is the classic type of drum roaster, whereas the outer wall of a double-wall drum roaster uses air to heat the inner wall and provide a more stable roasting experience. Generally, a drum roaster is easy to control and manipulate. However, if too much heat transfers to the beans via direct contact with the drum or the speed of the rotating drum is set too high, the coffee beans can end up scorched and their flavor distorted.
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