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All Journal International Journal of Energy Systems and Materials Innovation
Maria V. Sanchez-Delgado
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Energy Industrial & Manufacturing Engineering Mechanical Engineering

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Development of an Industrial-Scale Coffee Drying Technology: Energy Efficiency and Sustainability Assessment Richard A. Williams; Maria V. Sanchez-Delgado; John M. Dennis; Eleanor C. Sharpe; Samuel J. Pettinger
International Journal of Energy Systems and Materials Innovation Vol. 1 No. 2 (2026): Edition January- April IJESMI
Publisher : Gio Vani Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17524/ijesmi.v1i2.13

Abstract

This study addresses the critical need for energy-efficient and sustainable technologies in industrial coffee processing by developing and evaluating a novel waste-heat recovery preheater integrated into a coffee roasting system. The research experimentally investigates the impact of preheating on the thermal dynamics, energy efficiency, and product quality of Robusta coffee beans at a laboratory scale. Results demonstrate that utilizing exhaust heat to pre-condition beans significantly enhances process performance, achieving a 62.33% reduction in overall energy consumption and a 60.65% decrease in LPG fuel use. The preheating mechanism accelerated the roasting kinetics, reducing the time to target roast level by 2–3 minutes and improving moisture removal efficiency, yielding a final bean moisture content of 1.6% compared to 3.1% in the conventional process. These findings validate the preheater as a highly effective intervention for optimizing heat and mass transfer. The study concludes that integrating such waste-heat recovery technology presents a viable, scalable pathway for decarbonizing industrial-scale coffee drying and roasting operations, directly contributing to enhanced energy efficiency, reduced carbon footprint, and improved economic viability within the global coffee supply chain.
Co-Authors Eleanor C. Sharpe John M. Dennis Richard A. Williams Samuel J. Pettinger