Exergy analysis of biomass polygeneration system for power, hydrogen, and heat production

This study presents energy and exergy analysis of an integrated biomass-based polygeneration system comprising a gasifier, PEM electrolyser, and absorption refrigeration cycle for simultaneous power, hydrogen, and cooling production. Multi-objective optimisation using NSGA-II maximises energy and exergy efficiency. Results show 6.65% exergy efficiency and 6.95% energy efficiency improvements through optimisation. Optimal design parameters include gas turbine inlet temperature of 1,030°C, condenser pressure of 110 kPa, and biomass mass flow rate of 4.2 kg/s. The system demonstrates significant performance enhancement through careful parameter optimisation.