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1 0.99 0.98 0.97 0.96 0.4 0.5 0.6 0.7 0.8 0.9 1 Fraction of Real Thickness Figure 9.6 Effect of conduction length on the PCHE volume 9.2.3 Effect of Wavy Channels on PCHE Performance Straight channels are used in this work for evaluation of the thermal performance of the PCHE. However, HEATRIC units are usually manufactured with wavy channels to improve the heat transfer. Unfortunately, validated correlations for prediction of the heat transfer performance of wavy channels are not available. Therefore, straight channels were used since their thermal performance is well established and more conservative. However, one would like to quantify the potential volume reduction if the wavy channels were used. Therefore, a simple analysis for the case of the high temperature recuperator was carried out. In this analysis the operating conditions and the face area of the heat exchanger were kept the same and the heat exchanger length and pressure drop were calculated. For modeling of the wavy channels the heat transfer and friction models describe in Chapter 3 were used. Table 9.2 shows the result of this analysis. Table 9.2 Comparison of straight and wavy channel s 212 Fraction of Total VolumePDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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