Preliminary Analysis of the Effect of Heat Transfer Components Characteristics and Cycle Parameters on the Thermodynamic Performance and Components Cost of Supercritical CO2 Recompression Cycles for a 10MW Power Plant

Nowadays, significant efforts are made to develop technologies that can efficiently utilize clean energy sources in a sustainable manner. For this reason, supercritical carbon dioxide recompression Brayton cycles receive increased interest due to their combination of high efficiency and increased components compactness, characteris-tics that can assist the maximization of cycle performance and reduction of economic costs. At the present work, a thermoeconomic model of a 10 MW recompression cycle was developed. Initially, thermodynamic models of recompression cycle components such as heater, high and low temperature recuperators, cooler, turbines and com-pressors were developed in a Cape-Open free platform and the results were validated with data from open literature. For the modelling of components cost, open litera-ture-based cost models were used where the components cost was assessed as a function of the components’ main thermodynamic performance parameters such as power or conductance-area product taking also into account material-based correc-tions. At the next step, a parametric analysis was performed and the effect of pa-rameters such as split ratio, maximum cycle temperature and recuperators thermal effectiveness on the performance and cost of the recompression cycle was investi-gated facilitating the identification of the most promising combination of cycle and components characteristics. Finally, a dedicated cost function was derived through which the cost per net power of the recompession cycle could be assessed that could be used for future technoeconomic analyses.