The Drying of Spent Coffee Grounds in a Tray Drier | Biomedgrid
Journal: American Journal of Biomedical Science & Research (Vol.6, No. 5)Publication Date: 2019-12-11
Authors : Emily Haluschak; Hafizul Hazamuddin; John P McGee; Zeyuan Sun; Enrico N Martinez;
Page : 416-425
Keywords : Spent coffee grounds; Biodiesel; Drying kinetics; Effective Moisture Diffusivity; Convective transfer coefficients;
Abstract
Biodiesel has become an important sustainable alternative to petroleum-based diesel. Spent coffee grounds as a starting material to produce biodiesel can be cost effective especially if the grounds are dried before extracting the coffee oil. This work is part of a comprehensive research project to develop a sustainable biodiesel production process and focuses on the drying of spent coffee grounds using a laboratory tray drier. The drying kinetics were studied using two and four samples with controlled geometries at three different air flow rates and temperatures of 28, 30 and 32°C. The experimental data were used to determine the critical transport parameters in the drying process. Effective diffusivities varied from 1.03x10-11 to 8.11x10-10m2/s. The convective mass transfer coefficient was found to vary from 1.25x10-7 to 3.78x10-6m/s, while the heat transfer coefficient varied from eight to 31.2W/m2°C.
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