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HEMRO GROUP Heating (in) Grinders

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10.09.2015 2 Agenda BEVERAGE GRINDER COFFEE

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10.09.2015 3 Agenda BEVERAGE GRINDER COFFEE

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10.09.2015 4 Heat Development In Ground Coffee Heat comes from: • Motor (+ grind chamber & discs) • Breaking of beans • Friction between ground coffee particles • Friction with grind chamber • Friction with grinding discs

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10.09.2015 5 Heat Transfer Into Ground Coffee • Heat transfer into the coffee and out of the system

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10.09.2015 6 Heat Transfer Into Ground Coffee • Heat transfer into the coffee and out of the system • The longer between shots, the more heat is transferred

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10.09.2015 7 Heat Transfer Into Ground Coffee • Heat transfer into the coffee and out of the system • The longer between shots, the more heat is transferred • The slower the motor, the longer the dose, the hotter the motor

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10.09.2015 8 Heat Transfer Into Ground Coffee • Heat transfer into the coffee and out of the system • The longer between shots, the more heat is transferred • The slower the motor, the longer the dose, the hotter the motor • The more ground coffee in the grinder, the more heat is transferred

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10.09.2015 9 Temperature [°C] Time [h] Heat Development in Grinders Motor (idle) Idle operation (without grinding coffee)

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10.09.2015 10 Temperature [°C] Time [h] Heat Development in Grinders Motor (idle) Grind chamber (idle) Idle operation (without grinding coffee)

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10.09.2015 11 Temperature [°C] Time [h] 1 2 Heat Development in Grinders Motor (idle) Grind chamber (grinding) Grinding Motor (grinding) Grind chamber (idle)

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10.09.2015 12 Temperature [°C] Time [h] 1 2 Heat Development in Grinders Grind chamber (grinding) Grinding without ventilation Motor (grinding)

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10.09.2015 13 Temperature [°C] Time [h] 1 2 Heat Development in Grinders Grind chamber (grinding) With ventilation Motor (grinding) Motor (ventilated) Grind chamber (ventilated)

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10.09.2015 14 Temperature [°C] Time [h] 1 2 Heat Development in Grinders With ventilation Motor (ventilated) Grind chamber (ventilated)

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10.09.2015 15 Temperature [°C] Time [h] 1 2 Heat Development in Grinders With ventilation Motor Grind chamber

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10.09.2015 16 Temperature [°C] Time [h] 1 2 Heat Development in Grinders Slower motor (lower rpm) Motor (slower rpm) Grind chamber (slower rpm)

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10.09.2015 17 Advantages from Ventilation Cooling of motor: • Higher cycle possible K30: 2 double shots /min K30 Air: 4 double shots /min PEAK: 6 double shots /min Cooling of grind chamber: • More consistent grind adjustment • More consistent coffee temperature • More consistent extraction

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10.09.2015 18 Agenda BEVERAGE GRINDER COFFEE

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10.09.2015 19 Influence of Heat In Coffee Grounds What does not happen when grinder heats up: • Grind chamber expands • Bigger gap between the burrs • Coarser grinding

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10.09.2015 20 Influence of Heat In Coffee Grounds What does not happen when grinder heats up: • Grind chamber expands • Bigger gap between the burrs • Coarser grinding What happens when grinder heats up: • Aggregate states of coffee bean substances change • Coffee bean gets more malleable / pliable • Brewing behaviour “like coarser grind”

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10.09.2015 21 Influence of Heat In Coffee Grounds

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10.09.2015 22 Influence of Heat In Coffee Grounds

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10.09.2015 23 Agenda BEVERAGE GRINDER COFFEE

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10.09.2015 24 Influence of Heat In Coffee Grounds What happens when grinder heats up: • Faster blunt shots • More bitter, week, (diluted) • Less strength, higher extraction How to countersteer: • Adjusting finer, to lengthen the shots again • Lower the brewing temperature • … tbd …

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Thank you for your attention! 10.09.2015 25