A roaster with a rotating drum that provides agitation to the beans, while a heating element (typically either electric or gas) provides heat. The metal drum conducts heat to the beans, so drum roasters heat beans both by convectionTransfer of heat through the bulk movement of a fluid. In the case of coffee roasting, we discuss convection in the context of heated air moving as a... and conductionThe transfer of heat between matter. In coffee, conduction heating is contrasted with convection heating, which occurs in a moving fluid..
Drum roasters typically roast more slowly than air roasters, and impart a more rounded, less bright flavor profileFlavor Profile implies a graphical impression of a particular coffee, whether it be an artistic portrait or data graph of the perception of flavor compounds. In the case....
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