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problems [Hejzlar, 2008]. These benefits make PCHEs very appealing for applications where compact heat exchangers are desirable. 1.5 Thesis Outline Chapter 2: Recompression Cycle Optimization Chapter 2 details the changes made to the CYCLES II code for modeling the Recompression cycle, in addition to the history of the code and its capabilities. Also in this chapter are discussions of fluid impurities and detection gases, heat exchanger sizing, and the affects all these have on cycle efficiency. A discussion of the recompression cycle as compared to other cycles is also included. In addition, a brief study of an Ethane simple recuperative Brayton cycle is discussed. Chapter 3: S-CO2 Compressor Design This chapter details the history of S-CO2 compressors and the code, RGRC, developed in this work as a mean-line design code for real gases. For the reader unfamiliar with compressor design and operation, an overview of these topics is included as well. Detailed discussion of the code’s operation and results are presented. The compressors are developed to run with a 500 MWth recompression cycle to scale with the 250 MWth heat exchangers considered in Chapters 4 and 5. The compressor designs are chosen to produce both efficient and versatile compressors. An attempt at benchmarking has been made by using estimated geometry for an existing test compressor [Wright et al., 2008]. Chapter 4: Balance of Plant Options for the SFR Chapter 4 discusses the ex-core options for the SFR, from an efficiency focused perspective. Tools developed for modeling the S-CO2 recompression cycle are used to compare its performance to that of supercritical steam and conventional Rankine plants. Different configurations of the plant, including elimination of the intermediate loop, are considered. Computer codes for modeling heat exchangers are discussed, as well as the impact of the intermediate loop on efficiency. Chapter 5: Increasing SFR Efficiencies Chapter 5 details the changes that can be made within the core and choices in the balance of plant that improve the efficiency of the SFR. Any such effort is primarily aimed at improving the turbine inlet temperature. At higher temperatures differences between power cycles become important. Comparisons are made between several different configuration options and discussions of safety and cost are included with the efficiency results. The design configurations 20PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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