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With respect to the cycle layout condensation cycles were not considered because of the requirement of a year round supply of very cold cooling water. In addition the partial condensation cycle is very complex. Starting and power regulation are difficult in order to keep the balance between the pump and compressor. Therefore, they focused on investigating the recompression CO2 cycle. The study looked at cycles operating at 580oC and 700oC between 8 and 34 MPa. The calculated efficiencies were 38% for a turbine inlet temperature of 580oC and 42% for a turbine inlet temperature of 700oC. The turbomachinery efficiencies were selected to be conservatively low (82% for the main pump, 86% for the recompressing compressor and 90% for the turbine). Figure 2.17 shows the comparison of the main component sizes for steam, helium and CO2 cycles. There were other studies of the recompression cycle [Watzel, 1971] and [Pfost and Seitz, 1971] and a cycle with three compressors and two inter-coolers [Chermanne, 1971]. These studies reached the same conclusions as those that have been already described in this section. Figure 2.18 Schematics and temperature entropy diagram of the CO2 binary cycle [from Gokhstein and Verkhivker, 1969] 31PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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