Due to the low energy design of our roasters and the requirements for an environmental policy all over the world, Neuhaus Neotec developed the pre-Heating unit. Roasting of coffee requires a thermal energy of 700 - 750 kJ/kg of beans by physical laws. This thermal energy is introduced to the bean by the thermodynamics methods of heat transfer by :
- Radiant heat
depending on the machine type and conditions.
The individual roasting machine and the thermodynamics respond to a specific exhaust temperature of 250 – 450 °C depending o the roasting process and the exhaust cleaning method.
This energy could be recovered by means of preheating the green coffee latest before the roast
These different methods will
1. Reduce the energy costs by up to 25%
2. Reduce the CO2 emissions by 25%
3. Enhance capacity of the machine (up to 20% and under special conditions more)
Additional energy recovering by pre-heating the burner air is possible, too
The saving effect depends on:1. Roasting time (the longer, the more heat could be recovered)
2. The temperature of the exhaust gas.
Neuhaus Neotec offers two options:
Clean air preheating (ambient air is used after being preheated by a heat exchanger.)
Exhaust air preheating. The exhaust air is in direct contact with the green bean and it offers more efficiency.