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Ruel M. Mojica¹, Engelbert K. Peralta² and Jessie C. Elauria³

 

ABSTRACT

A batch-type coffee roaster that can be used for small-scale roasting was designed and fabricated at the College of Engineering and Agro-Industrial Technology, UPLB, College, Laguna. The machine consisted of the roasting chamber, the outside drum, the hopper, the auger, the heating plate, the burner and an electric motor. The machine’s performance was evaluated to establish the best combination of the operating parameters involved namely: auger speed, roasting time and fuel valve opening. Results show that auger speed ranging from 40-60 rpm did not significantly affect all the dependent variables. However, varying levels of roasting time (50-70 min) and fuel valve opening (1/2 open to fully-open) have significant effect in almost all the responses. Based on the results of sensory evaluation, coffee obtained using treatment combination of 40-rpm auger speed; 60-minute time of roasting; and 3/4 open valve gave the highest coffee rating of 86.1. Cost and return analysis revealed that using the coffee roaster for custom work is a profitable business with an annual net income of PhP 63, 451.49.

 Keywords: roasting, coffee, batch-type

 ¹Assistant Professor, Department of Agricultural and Food Engineering, Cavite State University, 4122 Indang, Cavite, Philippines; ²Associate Professor, ³Professor, Agricultural and Bio-Process Division, Institute of Agricultural Engineering, College of Engineering & Agro-Industrial Technology, University of the Philippines Los Baños, 4031 College, Laguna, Philippines.