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3 CO2 Transcritical Cycle Applications and Performance Simulations 3.1 Basic Cycles and the Parameters that Influence the Cycle Performances As mentioned in the previous chapter, there are three cycles, namely carbon dioxide transcritical power cycle, carbon dioxide Brayton cycle, and carbon dioxide cooling and power combined cycle, which have been proposed in the current study for utilizing the energy in low‐grade heat sources and waste heat. Thermodynamically, the larger the temperature difference between the cycle’s heat absorbing temperature and its heat rejecting temperature, the higher the cycle efficiency. From this viewpoint, for the same heat absorbing temperature, the CO2 transcritical power cycle will achieve a higher efficiency than the CO2 Brayton cycle if a low temperature heat sink is available. To achieve a satisfactory efficiency from a carbon dioxide Brayton cycle, a significantly higher heat source temperature is needed. The current study mainly focuses on the systems that work with carbon dioxide transcritical power cycles in low‐grade heat source utilization. However, the Brayton cycle and carbon dioxide cooling and power combined cycle have also been analyzed for their potential in waste heat utilization (i.e. the engine’s waste heat) by basic cycle analyses. Several definitions are needed to analyze the performance of the proposed carbon dioxide systems in low‐grade heat source 19PDF Image | Thermodynamic Cycles using Carbon Dioxide
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