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AbstractA transient heat and mass transfer analysis is carried out on cylindrical and spherical adsorbent reactors suitable for high-pressure CO2-based storage and green refrigeration systems. A comparative analysis is shown to arrive at the best reactor configurations subjected to different boundary conditions: free and forced convection conditions with fixed and time-dependent heat transfer coefficients, adiabatic, and constant wall temperature cases. The effects of external heating fluid temperature and flow rate on discharge characteristics and thermal-hydraulic performance of the proposed reactors are further expounded. The results showed that the cylindrical reactors throughout the various cases, outperformed the spherical reactors in terms of higher CO2 adsorption capacity and faster discharge rate. However, higher gravimetric uptakes are obtained for spherical reactors, which takes account of the reactor’s mass with much lower pumping power. Based on the detailed analysis, it is concluded that both the reactor geometries are feasible for higher-pressure CO2 storage and adsorption-based heat pump systems. To ensure higher CO2 uptakes, cylindrical reactors are recommended; however, if there is a constraint on the height and weight of the reactor, then the spherical reactors are extremely useful and highly recommended, like in the case of mobile air-conditioning systems. [ABSTRACT FROM AUTHOR]