Energy Evaluation of the Mechanical Drying of the Grain of Coffea arabica from Honduras

Main Article Content

Fredy Torres Mejía
Jhunior Marcía Fuentes
Juan Torres Mejía
Flavio Hernández Bonilla
Ricardo Santos Alemán
Ingris Varela
Shirin Kazemzadeh
Ismael Montero Fernández


The aim of this research work was to evaluate the methods of mechanical drying of coffee beans (Coffea arabica) from energy evaluations. The control variables were the drying of the grain and energy was used as the response variable, measured in Tonnes of Oil Equivalent (TEP), Barrels of Oil Equivalent (BEP), and Tonnes of Carbon Dioxide Equivalent (Ton CO2eq). The evaluations on the three methods of mechanical coffee drying indicate that the rotary dryer requires 1.0 TEP equivalent to 1.017 kg CO2eqkg-1 in dry parchment coffee (CPS), however, the vertical drying method requires 1.12 TEP (0.616 kg CO2eqkg-1 in CPS) and the static dryer requires 0.5 TEP (0.33 Kg CO2eqkg-1 in CPS). Furthermore, the biomass energy consumption in the rotary dryer is 12.60 MJkg-1, in the vertical dryer it is 7.46 MJkg-1, and the static dryer is 3.91 MJkg-1. These results indicate that the rotary dryer uses 91.95% of the biomass energy, the vertical dryer uses 90.31%, and the static dryer 90.68%. Concluding that rotary drying has a higher biomass energy consumption and reduces CO2 emissions kg-1 in dry parchment coffee, this method is also preferred by cuppers, as it preserves the sensory qualities of the coffee and contributes to reducing the impact. the environment in the consumption of electrical energy and the reduction of CO2 emissions. However, these predictors need more work to validate reliability.

Coffee, biomass, energy, emissions, environmental Impact.

Article Details

How to Cite
Mejía, F. T., Fuentes, J. M., Mejía, J. T., Bonilla, F. H., Alemán, R. S., Varela, I., Kazemzadeh, S., & Fernández, I. M. (2021). Energy Evaluation of the Mechanical Drying of the Grain of Coffea arabica from Honduras. Asian Journal of Biology, 11(1), 8-14.
Original Research Article


Marcía Fuentes JA, Montero Fernández I, Zumbado H, Lozano-Sánchez J, Santos Alemán R, Navarro-Alarcón M, Borrás-Linares I, Saravia Maldonado S. Quantification of bioactive molecules, minerals and bromatological analysis in carao (Cassia grandis). Journal of Agricultural Science. 2020;12(3):88-94.

Valdés GV, Cruz-Viera L, Comet-Rodríguez R. Influence of operating conditions on the extraction of polyphenols from leaves of Moringa oleifera L. CENIC, Chemistry Science. 2015;46:135-145.

Serna-Jiménez J, Torres-Valenzuela L, Martínez-Cortínez K, Hernández-Sandoval M. Use of coffee pulp as an alternative for the valorization of by-products. ION, Scielo. 2018;31(1):37-42.

Campa C, Mondolot L, Rakotondravao A, Bidel R, Gargadennet A, Couturon E, La Fisca P, Rokotomalala J, Jay-Allemand C, Davis A. A survey of mangiferin and hydroxycinnamic acid ester accumulation in coffee (Coffea) leaves: biological implications and uses. Ann Bot. 2012;110 (3):595-613.

Patay EB, Nemeth T, Nemeth TS, Filep R.; Vlase L, Papp N. Histological and phytochemical studies of Coffea benghalensis B. Heyne ex Schult., compared with Coffea arabica L. Farmacia, 2016;64(1):125-30.

Cáceres A, Pinales S, Ramos M, Marroquin M, Cruz S. Alternative use of coffee beans and leaves from seven regions of Guatemala for their antioxidant activity and chemical composition. International Journal of Phytocosmetics and Natural Ingredients. 2020;7(1): 5.

Gotteland M, de Pablo S. Some trues concerning coffee. Chilean Nutrition Magazine. 2007;34(2):105-115.

Naranjo M, Vélez LT, Rojano BA. Antioxidant activity of different grades of Colombian coffee. Rev Cubana Plant Med. 2011;16(2):164-173.

Honduran Coffee Institute, IHCAFÉ. Harvest Memory 2018-2019. Tegucigalpa, Honduras; 2019.

Marcía Fuentes J, Alemán Santos R, Chavarría Carrión L, Varela Murillo I, Alvarado N, Montero Fernández I. Development of a drink type infusion from coffee pulp (Coffea arabica) lempira variety of Honduras. Journal of Agricultural Science. 2019;12(1);209-212.

World Coffee Research (2020). Arabica coffee varieties (online).

Cruz D, López E, Pascual LF, Battaglia M. Technical guide for the construction and operation of solar dome dryers. Journal of Agriculture and Environment for International Development. 2010;104(3-4):125-138.

Restrepo A, Bubano J. Solar thermal availability and its application in grain drying. Scientia ET Technica. 2005;27:127-132.

Quintanar Olguin Juan, Roa Durán Refugio. Thermal and financial evaluation of the drying process of coffeebean in a active solar dryer type greenhouse. Revista mexicana de ciencias agrícolas. 2017;8(2):321-331.

Gutiérrez-Flórez JM, Copete-López H. Towards the Improvement of the mechanical drying of coffee in Colombia. TecnoLógicas. 2009;23:109-132.

Oliveros C, Sanz J. Engineering and coffee in Colombia. Engineering Magazine. 2011;33:99-114.

Fonseca S, Abdala J, Ferro V, Pantoja J, Torres A. Comparative study of solar drying of coffee in traditional and blackened squares. Chemical Technology. 2003;23(3):48–54.

Rodríguez C, Meira F, Cirillo M, Carvalho E. Quality of dried coffee in terraces with different pavements and layer thicknesses. Coffee science, Lavras. 2012;7(3):223-237.

Alcántara V, Padilla E. Analysis of CO2 emissions and their explanatory factors in different areas of the world. Journal of Critical Economics. 2005;4:17-37.

Prada A, Vela C, Bardález G, Saavedra J. Effectiveness of a coffee drying process using solar dryers with a continuous air flow system powered by photovoltaic energy, in the San Martín Region, Peru. Technological information. 2019;30(6):85-92.

Del Panta L, Regio G, Gil D. Study of the mieles water treatment system in Salcedo Dominican Republic; 2009.

Rincón Prat S. Energy generation from colombian residual biomass. Foro Innovación, Environment for Life. National University of Colombia. Bogotá, Colombia; 2009.

Torres-Mejía F. Evaluation of the energy potential of the waste generated in the Coffee processing in Honduras. University of Zaragoza. Zaragoza, España; 2011.

Institute for Diversification and Saving of Energy, IDAE. Renewable energy manuals; Biomass Energy; 2007.

Mendivil N, Sandoval G. Bioenergy from forest and wood residues. Wood and forests, 24 (Special number). 2018;e2401877.

Caraballo-Pou MA, García-Simón J. Renewable energies and economic development: An analysis for Spain and the large European economies. The Economic Quarter. 2017;84(335):571-609.

Gmünder S, Toro C, Rojas J, Rodríguez N, Restrepo G, Barrera J, Rojas D, Puerto M, Gaitan A, Suppen N, López F. The environmental footprint of colombian coffee energy demand. Colombia; 2020.

National Center for Coffee Research, CENICAFE. Efficient use of energy in mechanical coffee drying. Technical Advances. 2009;380:1-6.