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Figure 9.6 shows the effect of the reduction of the conduction length on the total heat exchanger volume of the high temperature recuperator. In this study the face area, power rating and operating conditions were kept constant and the heat exchanger lengths for different fractions of the geometrical thickness, t, were calculated. The operating conditions and thermal power of the high temperature recuperator were used for this study. The figure shows the total heat exchanger volume normalized to the heat exchanger volume for which the geometrical length was used as a conduction length. If the effective conduction length is 60% of the geometrical length between the hot and cold channels the total heat exchanger volume is reduced by only by about 2%. This indicates that conduction is not a primary heat transfer resistance in this case and using the geometrical thickness instead of the true conduction length introduces a small error in the evaluation of the recuperators and pre-cooler. Given the minor effect of the conduction length on the heat exchanger volume the geometrical thickness was used in all PCHE calculations in this work. This situation would be different if conduction was the main heat transfer resistance. In such cases using the geometrical thickness would introduce a significant overestimate of the heat exchanger size. 211PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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