Abstract
This work is aimed at study of a bio-hydrogen fueled HCCI engine performance where a parametric study is conducted to ascertain the effects of varying the percent excess air and ambient temperature on its energy and exergy efficiencies. A maximum energy efficiency of 45% and an exergy efficiency of 37% are obtained at the excess air of 25%. A narrow range of 42%–40% energy efficiency and a wide of range of 25%–45% exergy efficiency were achieved between the 20% and 40% excess air and an ambient temperature of 300 K. Close range of variation for energy efficiency (48%–44%) and exergy efficiency (32%–36%) were achieved between the ambient temperatures of 13 and 41°C. Comprehensive second law analysis indicates that 52% of the hydrogen exergy is destroyed due to various irreversible processes of the engine, around 40% is available as a useful work output, and 7.83% is lost via engine exhaust.
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