Green coffee preheating is a way of harnessing excess exhaust air energy: Thereby, the hot air from the exhaust air stream is diverted to a preheating reservoir via a piping system. Therein, the green coffee is preheated to a temperature of about 100 degrees Celsius so that less heat energy is needed for the roasting that follows.

Green coffee preheating offers energy savings of about 20 percent and a reduction of carbon dioxide emissions by 25 percent. At the same time, the roasting machine’s processing performance is enhanced by up to 20 percent.

The process itself has no negative impact on ground coffee taste.