Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( advanced-nuclear-power-technology-program-supercritical-carb )

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0.04 0.03 0.02 0.01 0 Reactor Recuperator - Precooler Recuperator - Low Pressure Side High Pressure Side 0 20 40 60 803 100 120 Total Heat Exchanger Volume (m ) Figure 4.15 Fractional pressure drops for optimized design Figure 4.15 shows the fractional pressure drops for the optimum designs. The results are similar to those obtained earlier in the pressure ratio studies. The low-pressure side of the recuperator represents the largest pressure drop in the system, which can be an order of magnitude higher than the other heat exchanger pressure drops. It decreases almost linearly with heat exchanger volume. Since the pre-cooler and the high pressure side of the recuperator pressure drops are not significantly affected and the recuperator effectiveness is also almost unchanged (see Figure 4.16) the reduction of the pressure drop for the low pressure side of the recuperator is the prime reason for efficiency improvement at higher total heat exchanger volumes. The pre-cooler pressure drop is very high for the total volume of heat exchangers of 40 m3 and lower. Once sufficient pre-cooler volume is provided the pre-cooler fractional pressure drop saturates and an additional increase of the total heat exchanger volume does not have a significant impact on its value. The high-pressure recuperator side fractional pressure drop is the least important parameter. Its value is very low, thus its contribution to the efficiency 88 Fractional Pressure Drop

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