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Figure 1.2: The density spike near the critical point of CO2. As the temperature decreases and approaches the critical temperature (indicated with the red line), the density rises more rapidly [NIST, 2007]. Earlier research on the S-CO2 cycle by Vaclav Dostal sized components and calculated efficiencies of the S-CO2 recompression cycle. Dostal’s research optimized heat exchanger sizes, roughly sized turbomachinery, and showed that the S-CO2 cycle could be economically competitive, especially at higher turbine inlet temperatures [Dostal, 2004] through the use of a steady state code called CYCLES. This work has been continued and studies of the steady-state and transient cycle performance have been conducted through the use of computer codes at MIT and in an experimental compression loop operated by Sandia National Laboratory in collaboration with Barber-Nichols Inc. [Wright et al., 2008]. CYCLES III is the result of updates to Dostal’s CYCLES and its operation is detailed in Chapter 2. It is a steady-state code that models the recompression cycle as well as the simple- recuperative Brayton cycle. It models compressors simply, because it is operating at steady state and the user inputs a value for the compressor efficiency. More information is needed about how compressors will operate in the recompression cycle, so the development of a mean-line compressor design and performance code (RGRC) was undertaken in this research. RGRC is detailed in Chapter 3 and has produced compressor performance maps which are useful to 17PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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