Exploration of PROMETHEE II and VIKOR methodology in a MCDM approach for ascertaining the optimal performance-emission trade-off vantage in a hydrogen-biohol dual fuel endeavour

The alternative which signified biodiesel under hydrogen enrichment, at hydrogen injection duration of 9000 µs at a constant engine speed of 1500 RPM, was discerned as the the most appropriate alternative fuel combination at 75% load since it has been ranked first by both the MCDM methods. At full load for PROMETHEE II it was alternative A4, and for VIKOR it was observed as alternative A3 which signified biodiesel under hydrogen enrichment at hydrogen injection duration of 7000 µs at 1500 RPM. Alternatively, A10 strategy which indicate biodiesel ethanol blend along with hydrogen enrichment at hydrogen injection duration of 13,000 µs at 1500 RPM was observed to be the least preferential amongst the alternative for both the MCDM methods, at both 75% and 100% loads. Since there was consistency in the ranking, in order to judge the performance of both the methods Spearman's Rank Correlation Coefficient was calculated and was observed to be within acceptable levels lending an index of robustness of the optimal choices of the strategies advocated by the MCDM methodologies adopted in the present case study.