Exergy analysis in intensification of sorption-enhanced steam methane reforming for clean hydrogen production: Comparative study and efficiency optimisation

Integrated CO2 Capture and Utilization by Combining Calcium Looping with CH4 Reforming Processes: A Thermodynamic and Exergetic Approach

“…However, heat flow ( Q̇ s ) provided by a heating source with temperature T is associated with exergy destruction (Ėx Q ,calc ), since not all heat can be used for work (eq ). , Ėx Q , calc = Q̇ s × true( 1 − T 0 T true) Heat is required for only the solar calciners of cases 1 and 2. Calcium looping driven by concentrated solar power has been widely studied in the literature, in which a heliostat field directs solar radiation toward a tower receiver, which can be the calciner itself. ,, In general, solar irradiation Q̇ s depends on the surface area A of the heliostat field and on direct normal irradiance DNI, with the latter varying between geographic regions and time zones.…”

“…However, heat flow ( Q̇ s ) provided by a heating source with temperature T is associated with exergy destruction (Ėx Q ,calc ), since not all heat can be used for work (eq ). , Heat is required for only the solar calciners of cases 1 and 2. Calcium looping driven by concentrated solar power has been widely studied in the literature, in which a heliostat field directs solar radiation toward a tower receiver, which can be the calciner itself. ,, In general, solar irradiation Q̇ s depends on the surface area A of the heliostat field and on direct normal irradiance DNI, with the latter varying between geographic regions and time zones.…”

“…However, heat flow (Q ̇s) provided by a heating source with temperature T is associated with exergy destruction (E ̇xQ,calc ), since not all heat can be used for work (eq 15). 24,30…”

“…Conducting an exergy analysis could provide an answer to this question. Based on the second law of thermodynamics, an exergy analysis accounts for the degradation of mass and energy streams when undergoing various processes, providing a rational and meaningful assessment of the useful energy contained in a system. ,, Zhang et al reported a higher exergy efficiency for sorption-enhanced biomass gasification coupled with in situ conversion of CO 2 to syngas compared to standalone sorption-enhanced gasification . Such a study would be fruitful for SMR-CaL-DRM, which has not yet been reported yet.…”