Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility

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Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility ( development-supercritical-carbon-dioxide-brayton-cycle-impro )

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Figure 5 shows how the temperature difference across the reactor impacts the power turbine inlet temperature that is very important to the overall efficiency. Figure 5. Power turbine inlet temperature as a function of temperature drop across the reactor. The objective of this task is to determine the overall plant cycle efficiency by the combination of the increased efficiency of each component in the secondary side of the HTGR. To accomplish this task, we performed a number of parametric studies to determine the effect of each component on the overall Brayton cycle efficiency. In order to calculate the pressure and temperature at the exit of a polytropic expansion or compression process, pressure-enthalpy (P-H) data from the NIST database was used. The procedure is described below and depicted in graphical form in Figure 6: (1) Starting Point 1, follow the line of constant entropy to the required discharge pressure of P2, locating the isentropic discharge state point of 2is. (2) With these two points located, the differential isentropic enthalpy can be calculated from the following equation: his h2is h1 (1) (3) Calculate the real discharge enthalpy of point 2 using: h2 his h1 (2) is where is is the isentropic process efficiency. The point 2 is on the same pressure P2 line shown on Figure 7. At the point 2, temperature can be obtained on the same temperature isotherm line in Figure 6. 6

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