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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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Length (m) Volume (m3) Hot side pressure drop (kPa) Cold side pressure drop (kPa) Straight Channels 1.69 51.17 83.80 29.08 Wavy Channels 1.43 43.19 100.21 36.14 If wavy channels were used the volume of the heat exchanger was reduced by 16%. On the other hand the hot side pressure drop increased by 20% and the cold side pressure drop by 34%. This would require to re-optimize the heat exchanger for the cycle to gain the best performance. It should be noted that this is a very crude analysis and in the future it is necessary to obtain more precise correlations of the heat transfer coefficient and friction factor. 9.2.4 Simplified Stress Analysis for PCHE Design Calculations The important issue of stress analysis was not addressed in full detail due to its complexity. From the HEATRIC workshop at MIT [Dewson and Grady, 2003] it is known that the stress analysis is performed such that every single channel is designed as an independent pressure vessel based on the ASME code for non-cylindrical pressure vessels. Each of the channels itself is designed as a pressure boundary. No credit is taken for the round shape of the channel. The channel is approximated as a rectangle. This leads to a very safe design. HEATRIC reported that under a burst test the diffusion bonded plates designed for 12.4 MPa ruptured at room temperature at 175 MPa. The rupture occurred in the base metal and not in the diffusion bond. The diffusion bonding process does not change the mechanical properties of the base metal. Up to 20 MPa HEATRIC uses a plate thickness of 1.1 to 1.6 mm. It was decided to use 1.5 mm for the current heat exchanger reference design. The channel pitch is 2.4 mm. The channel shape does not necessarily have to be semi-cylindrical. HEATRIC prefers to use constant plate thickness and vary the etching depth in order to satisfy the stress analysis. In this work the channel shape was, for all calculations, approximated by a semi-circle. The typical channel diameter manufactured by HEATRIC is 2mm. This channel diameter was used for all calculations and the channel depth was 1 mm in order to satisfy the semi- circular channel shape. The dimensions specified in this paragraph were used for all heat 213

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