Complex Approach to Conceptual Design of Machine Mechanically Extracting Oil from Jatropha curcas L. Seeds for Biomass-Based Fuel Production

Table 1

Decomposition and interpretation of primary user’s needs (machines mechanically extracting oil).

Primary user’s need	Need decomposition	Interpretation of need (requirement)
Low operational cost	Operated by unskilled worker	Low demand for qualification
	Low energy consumption	Low power (fuel) consumption
	High availability	Low failure rate
	Long lifetime	Long lifetime of machine parts
High productivity	High labour productivity	Low manual work intensity
	Fast filling up of machine	Fast filling up of machine bin
	Fast and easy cleaning	Fast and easy cleaning of chamber
	Easy spare parts replacement	Quick parts disassembly or assembly
High yield of quality oil	High oil yield	High efficiency of extraction
	Low waste	High degree of seeds utilization
	Clean oil	Low volume of impurities