Energy and exergy analyses of an integrated system using waste material gasification for hydrogen production and liquefaction.

Highlights • A solar power-based system for hydrogen production and liquefaction is suggested. • Thermodynamic assessment of the integrated system is investigated. • Impact of design indicators on the power and hydrogen generation rate is evaluated. Abstract In this study, a new combined gasification process using various waste materials for multigenerational operation, containing the hydrogen, power, heating-cooling and hot water generation. In the present multigenerational plant, a waste material gasifier component is combined with the Brayton cycle, Stirling engine cycle, single effect absorption cooling cycle and proton exchange membrane electrolyzer for multiple outputs generation. To analyze and evaluate this integrated system, a comprehensive thermodynamic analysis and assessment for the multigeneration plant components is introduced, the second-law efficiency, associated with the overall system and its sub-systems are described, and the impacts of some arrangements and working statuses on the plant efficiency are investigated. The study results show that, this integrated plant has an overall energetic efficiency of 61.57% and an overall exergetic efficiency of 58.15%, when the produced net power is 94 MW, and also hydrogen generation rate is 0.077 kg/s, respectively. [ABSTRACT FROM AUTHOR]