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investigated for many years. The CO2 transcritical power cycle, on the other hand, is scarcely treated in the available literature. A CO2 transcritical power cycle (CO2 TPC) shows a higher potential than an ORC when taking into account the behavior of the heat source and the heat transfer between heat source and working fluid in the main heat exchanger. This is mainly due to a better temperature glide match between heat source and working fluid. The CO2 cycle also shows no pinch limitation in the exchanger. This study looks at the performance of the CO2 transcritical power cycle in utilizing energy from low‐grade waste heat to produce useful work in comparison to an ORC using R123 as working fluid. Due to the temperature gradients for the heat source and heat sink, the thermodynamic mean temperature has been used as a reference temperature when comparing both cycles. The thermodynamic models have been developed in EES. The relative efficiencies have been calculated for both cycles. The results obtained show that when utilizing the low‐grade waste heat with the same thermodynamic mean heat rejection temperature, a transcritical carbon dioxide power system gives a slightly higher power output than the organic Rankine cycle. Y. Chen, W. Pridasawas, P. Lundqvist, “Dynamic Simulation of a Solar‐Driven Carbon Dioxide Transcritical Power System for Small Scale Combined Heat and Power Production”, Solar Energy 84 (2010), pp 1103–1110 This paper discusses the possibility of using carbon dioxide as a working medium for a solar‐driven power system. In this study, the dynamic performance of a small scale solar‐driven carbon dioxide power system is analyzed by dynamic simulation tool TRNSYS 16 and Engineering Equation Solver (EES) using co‐solving technique. Both daily performance and yearly performance of the proposed system have been simulated. Different system operating parameters which will influence the system 122PDF Image | Thermodynamic Cycles using Carbon Dioxide
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