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39.4 39.35 39.3 39.25 39.2 39.15 39.1 39.05 39 12.5/0.7/2.05 12.5/0.7/2 12.5/0.7/2.1 12.5/0.75/2.05 39.36 39.35 39.34 2.75 2.8 2.85 12.5/0.65/2.1 12.5/0.65/2.05 12/0.7/2.05 12/0.65/2.1 12/0.65/2.05 13/0.7/2.05 13/0.65/2 13/0.65/2.1 13/0.65/2.05 2.7 2.75 2.8 2.85 Pressure Ratio 2.9 2.95 Figure 4.8 Cycle Efficiency Optimization for 60m3 total heat exchanger volume The total heat exchanger volume of 60 m3 was again selected to present the result of the optimization. Figure 4.8 displays the cycle efficiency for different cases. The first number in the legend stands for the pre-cooler volume in m3, the second for the length of the pre-cooler in m and the last for the length of the recuperator in m. As can be seen the pressure ratio does not significantly affect the cycle efficiency. If the pressure ratio is varied between 2.7 and 3.2 the maximum efficiency reduction from not operating at the optimum pressure ratio is only about 0.36%. Similarly once the pressure ratio is higher than 2.75 the cycle efficiency is not very sensitive to the heat exchanger length and the split of volume between the recuperator and the pre-cooler. Since there is a greater flexibility in selecting the volume split and the heat exchanger lengths one should investigate the importance of these parameters on the cycle efficiency. One might expect that the volume of the pre-cooler would significantly affect the cycle efficiency. Figure 4.9 was obtained for a total volume of heat exchangers of 60 m3. When the pre-cooler volume fraction was varied from 0.1 to 0.5 and the recuperator volume was adjusted accordingly in order to keep the total heat exchanger volume 82 Cycle Efficiency (%)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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