Development Of A Supercritical Carbon Dioxide Brayton Cycle

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Development Of A Supercritical Carbon Dioxide Brayton Cycle ( development-of-supercritical-carbon-dioxide-brayton-cycle )

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Table 3-9. Comparison of cycle implication due to various cycle layouts and intermediate cooling Cycle layout He Indirect 3 IC Cycle Efficiency Differential Efficiency Gain He Indirect no IC 45.19% N/A He Indirect 1 IC 48.25% 3.06% He Indirect 2 IC 48.92% 0.67% 49.07% 0.15% N2/He Indirect no IC 45.29% N/A N2/He Indirect 1 IC 49.39% 4.10% N2/He Indirect 2 IC 50.19% 0.80% N2/He Indirect 3 IC 50.47 0.28 CO2 Split Flow 52.09 N/A N2/He Indirect with a Combined Cycle 49.56 N/A Observations from this section include: Intercooler increases the cycle efficiency due to lowering the inlet temperature to the compressor. A single intercooler improves the cycle efficiency by approximately 3 %. Once the first intercooler is used, the second and third intercooler provide much smaller efficiency increases. The reheat option was not investigated in this chapter. However, the reheat option needs to be fully investigated for liquid coolants such as molten salts, where the ability to deliver heat with low pumping power allows low-pressure-loss heaters to be used and located close to the turbomachinery. We performed a number of HYSYS simulation to investigate a number of different cycle configurations: combined cycle and reheat cycle. In this report, results from the combined cycle are included. A snapshot of HYSYS model is shown in Figure 3-18 along with the cycle configuration of the combined cycle in Figure 3-19. This indirect configuration is a Brayton cycle and a Rankine cycle. 39

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