A machine which roasts coffee at the desired color, aroma and taste is called the coffee roaster.
Coffee roasters are classified by:
1- Heat transfer method
2- Heating system
3- Heat source
4- Operating system
Heat transfer method
Heat transfer methods in coffee roasters are in three groups:
1- Drum roasters
2- Fluid bed roasters
3- Continuous roasters
Heating system
Two heating systems are used in coffee roasters:
1- Direct heating
2- Hot air circulation
Heat source
Four types of heat sources are used in coffee roasting machines:
1- Electricity
2- Natural gas
3- LPG
4- Solid fuel
Operating systems of coffee roasters
Coffee roasters are classified in three groups in regards with their operating systems:
1- Manually operated
2- Operated with roast profile
3- Full automatically operated
