tags: [] - coffee/roasting - coffee/equipment - coffee/equipment/roaster aliases: - Cooling pan - Roaster cooling tray - Bean cooler

Cooling Tray¶

Tags: #coffee/roasting #coffee/equipment #coffee/equipment/roaster Aliases: Cooling pan, Roaster cooling tray, Bean cooler Related: Roasting MOC | Roast Profile | Development Phase | Development Time Ratio Status: ✅ Complete

Overview¶

The cooling tray is the component of a coffee roasting system into which hot beans are discharged at the end of the roast, where they are rapidly cooled to stop the roasting process and arrest flavour development. On a drum roaster, the cooling tray is typically a circular or rectangular perforated pan positioned beneath or adjacent to the roasting drum, fitted with a motorised agitator arm (stirrer) that keeps the beans moving, and connected to a suction fan that draws ambient air upward through the bean mass. The speed and completeness of cooling is critical: beans that cool slowly continue to develop thermally after drop, shifting the actual drop point and making profile replication difficult.

Function¶

When the roaster drops the batch, beans at temperatures of 200–230 °C are discharged into the cooling tray. The cooling system must reduce bean temperature as rapidly as possible. The SCA and most professional roasting references recommend reaching below 35–40 °C within four to five minutes for commercial roasting — a benchmark that ensures the post-drop thermal development (coasting) is minimal and consistent.

Cooling is achieved through:

Forced air suction: A fan beneath the tray draws ambient air upward through the perforated base and through the bean mass; ambient air at 20–25 °C in contact with 200+ °C beans creates substantial convective heat transfer
Mechanical agitation: The stirrer arm keeps beans moving continuously, preventing them from settling into hot clumps and maximising each bean's exposure to cooling air
Surface area and tray depth: A wider, shallower tray cools faster than a deep, narrow one; cooling tray sizing is matched to roasting drum batch capacity

Cooling Rate and Roast Outcome¶

The rate at which beans cool after drop affects the degree of post-drop development. Slow cooling extends the effective development phase: beans at 200 °C that take eight minutes to reach 40 °C continue reacting thermally for those eight minutes, effectively extending the roast by an equivalent period. In a roasting operation where cooling is slow or inconsistent, the roaster's target drop temperature must account for the additional development that will occur during cooling — making the cooling tray's performance a variable in profile calibration.

Commercial operations requiring strict batch-to-batch consistency ensure that cooling performance is constant. Ambient air temperature affects cooling rate — a roasting room in summer at 35 °C provides far less cooling capacity than the same room in winter at 5 °C. Some operations use water-cooled trays or refrigerated air injection for consistent cooling performance in hot climates; water misting of the bean surface is also used in high-throughput commercial roasting (though this adds moisture to the roasted bean surface and is controversial in specialty contexts).

Sizing and Specifications¶

Cooling tray size is matched to drum batch capacity. Overfilling the tray — discharging more beans than the tray is designed for — reduces cooling efficiency by increasing the depth of the bean mass and restricting airflow. Most drum roasters specify a cooling tray sized for 100–110% of the drum's rated batch capacity to accommodate minor over-filling without performance degradation.

Key Facts¶

Cooling tray function: rapidly cool beans after drop to arrest post-roast thermal development
Cooling mechanism: forced air suction through perforated base; mechanical agitator keeps beans moving
Target: reduce bean temperature below 35–40 °C within 4–5 minutes (SCA reference)
Slow cooling = extended effective development; inconsistent cooling = inconsistent roast outcome
Ambient temperature affects cooling rate; hot climates may require refrigerated air or water cooling
Tray size matched to drum batch capacity; overfilling reduces cooling efficiency

References¶

Changelog¶

Date	Change
2026-04-27	Note created

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