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Heat generation and throughput

How grinder speed, burr type, and throughput influence heat buildup and coffee quality.

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  • Coffee Basics Nerds
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Article 7 of 12 in Grinding Science & Technology/
Heat generation and throughput

Key Concepts

  • Heat Generation:

  • Grinding produces friction, which increases the temperature of the coffee grounds.

  • Excessive heat can cause premature degassing, volatile loss, and flavor changes (bitterness, muted aromatics).

  • Factors Influencing Heat:

  • Burr Type: Flat burrs generally generate more heat at high speeds; conical burrs dissipate heat better.

  • Grind Fineness: Finer grinds take longer to pass through, generating more friction.

  • Throughput: High-speed grinding of large batches can significantly raise temperature.

  • Management Strategies:

  • Grind in small doses to minimize heat buildup.

  • Allow the grinder to rest between heavy sessions.

  • Monitor bean temperature post-grind for quality control.

  • Impact on Coffee:

  • Heat can affect extraction balance, aroma retention, and crema formation in espresso.

  • Cooler grinding preserves delicate flavors and ensures more consistent shot profiles.

Summary

Understanding and controlling heat generation during grinding is essential for preserving coffee quality. Balancing throughput and grind speed allows for both efficiency and flavor integrity.

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Coffee Basics Nerds

Written by : Coffee Basics Nerds

Expert coffee historians and brewing enthusiasts dedicated to sharing the rich heritage and techniques behind your perfect cup of coffee.

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