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3. TASK 2: IMPROVEMENT OF VHTR NET EFFICIENCY Task 2-1 Parametric study due to enhancement of each component’s efficiency The objective of this task is to determine the overall plant busbar 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 parametric study of the effect of each component on the overall Brayton cycle efficiency. Turbine Inlet Temperature The inlet temperature to the high-pressure turbine is dependent on the temperature at which coolant exits the core and the effectiveness of IHX. For a given power conversion unit with a fixed IHX effectiveness the turbine inlet temperature is solely dependent on the primary outlet temperature. Plotting the cycle efficiency and cycle pressure ratio as function of IHX primary outlet temperature, it is observed that there exists a maximum cycle efficiency for a given core exit temperature. It is also observed that the cycle pressure ratio increases, as the core outlet temperature is increases but decreases as the IHX primary outlet temperature is increased. Maximum cycle efficiency coincides with an optimum pressure ratio. Other considerations must be made when selecting the core exit temperature. One such consideration is the IHX primary outlet temperature; ASME has specified that this outlet cannot exceed 400 C. Table 4 summarizes results of parametric study as a function of turbine inlet temperature using the Visual Basic model. Figures 3-1 and 3-2 show cycle efficiency vs. IHX primary outlet temperature, and cycle pressure ratio vs. IHX primary outlet temperature, respectively as a function of core outlet temperatures. Table 3-1. Parametric study as a function of the turbine inlet temperature. IHX Effectiveness Core Outlet Temperature IHX Primary Outlet Temperature C IHX Secondary Inlet Temperature C IHX Secondary Outlet Temperature C Cycle Pressure Ratio Plant Busbar Efficiency C Core Inlet Temperature C % 0.92 850 400 388.25 348.10 809.86 4.6569 42.55 420 440 407.90 369.46 811.56 4.2427 43.16 427.55 390.83 813.28 3.8784 43.67 460 447.20 412.19 814.99 3.5564 44.08 480 580 466.85 433.55 540.23 816.70 825.23 3.2705 44.39 500 486.50 454.91 818.40 3.0159 44.58 520 506.15 476.47 820.11 2.7883 44.64 540 525.80 497.63 821.82 2.5840 44.57 560 545.45 518.99 823.53 2.4002 44.34 565.10 2.2342 43.94 600 584.75 561.71 826.95 2.0839 43.32 620 604.40 583.07 828.65 1.9475 42.44 640 624.06 604.43 830.36 1.8233 41.24 900 400 388.25 343.76 855.52 5.3357 43.65 420 407.90 365.11 857.22 4.8568 44.32 19PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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