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Where Cmin refers to the smaller of Chot or Ccold. Chot cp,hotm hot (4) Ccold cp,coldm cold (5) The log mean temperature difference (LMTD) and the minimum approach were calculated by HYSYS and used to determine heat exchanger performance. The effectiveness, LMTD, and minimum approach served as limits to the allowable working conditions within the cycle. An acceptable effectiveness, LMTD and minimum approach for each heat exchanger were determined and the working conditions were set to take advantage of these limits in order to maximize efficiency. The limits imposed on the cycles are summarized in 3-15 through Table 3-17. The polytropic efficiency of the turbomachinery was used for efficiency calculation rather than the isentropic efficiency. The polytropic efficiencies for the turbines and the compressors were assumed to be 92% and 90%, respectively. These values are representative of expected efficiency that will be available for the VHTR project. Once the working conditions and limits were set the cycle pressure ratios were optimized. For the combined cycle the mass split between the PCU and HTLHX was also optimized. Table 3-15. Cycle conditions for three-shaft configuration. Parameter Nominal Value IHX cold-side outlet temp, °C 885 IHX effectiveness limit <97% IHX temperature pinch limit, °C 5 IHX LMTD, °C 15 Compressor outlet pressure, MPa 7.05 Precooler outlet temperature, °C 30 Recuperator effectiveness 95% HTLHX effectiveness limit <97% HTLHX temperature pinch limit, °C 5 HTLHX LMTD, °C 27 47PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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