Abstract
Various supercritical carbon dioxide (S–CO2) cycles for a power conversion system of a Molten Carbonate Fuel Cell (MCFC) hybrid system are studied in this paper. Re-Compressing Brayton (RCB) cycle, Simple Recuperated Brayton (SRB) cycle and Simple Recuperated Transcritical (SRT) cycle layouts were selected as candidates for this study. In addition, a novel concept of S–CO2 cycle which combines Brayton cycle and Rankine cycle is proposed and intensively studied with other S–CO2 layouts. A parametric study is performed to optimize the total system to be compact and to achieve wider operating range. Performances of each S–CO2 cycle are compared in terms of the thermal efficiency, net electricity of the MCFC hybrid system and approximate total volumes of each S–CO2 cycle. As a result, performance and total physical size of S–CO2 cycle can be better understood for MCFC S–CO2 hybrid system and especially, newly suggested S–CO2 cycle shows some success.
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