Small-scale versatile crop roaster

The 10-kg capacity of the developed machine fits the requirements of small-scale coffee processors in terms of end-users' demand and the affordability of the machine as compared to the 100-kg capacities of expensive commercially-available roasters. Cost of the machine was estimated at about Php. 13,800 without the microcontroller, and at around Php. 25,400 with the microcontroller. The use of electronically-driven microcontroller provided better roasting temperature control, shorter roasting time as well as accuracy and flexibility of heating in a stable temperature setting, thus, resulting in better power consumption efficiency, uniformed roasting, and better end-product quality for a premium price in the market. These flexibility provided varying roasting time by minute and adjusting roasting temperature by 1 deg C increment. Recommended optimal conditions for processing should be 204.5 deg C roasting temperature, 19.75 minutes roasting time duration, and 12.25% initial moisture content (MC) of green beans. Economic analysis of the technology showed a benefit-cost ratio of 1.65 and a payback period of only 0.515 year on approximately 186 days of continuous 6-hour operation per day. Potential animal net income using the technology is about Php. 51,800. About 1,219.49 kg of roasted beans per year should be produced to break even. The potential advantages cited by the target clients included increased product shelf life, improved product quality for premium price, and it is locally-manufactured. However, the technology needs further performance testing on a village-scale processing and with other potential beans other than coffee. With its electronic system component, technical skills for operation, repair, and maintenance of the equipment are critical in its adoption.