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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Application of the modified heat transfer formulas for the C-type Heat Exchanger in Passive Heat Removal System of CAP1400
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Application of the modified heat transfer formulas for the C-type Heat Exchanger in Passive Heat Removal System of CAP1400

机译：改性传热公式在CAP1400无源散热系统中的C型热交换器中的应用

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摘要

A set of modified heat transfer formulas were evaluated based on the scaled PRHR HX experiment. Then they were coded into the newly developed Best-Estimation PRHR-MHT Code (PRHR HX-Modified Heat Transfer Code), which was used to evaluate the heat transfer effects of the specific C-type PRHR HX in CAP1400. The applicability of the traditional and modified formulas were evaluated under different engineering operation conditions, and the overall uncertainty was estimated to be within 2%. The sensitive analysis was then carried out to evaluate the influencing factors on the modified formulas in the PRHR HX heat transfer process. The predicted results validate that as much as 60 percent of the temperature difference may drop in the upper horizontal bundle region under some accidental conditions, and the rod bundle effects as well as the cross flow and bubbles disturbances can also enhance the heat transfer effects. The calculation results prove that the PRHR HX design has sufficient safety margin of maximum 27.6% under the ATWS accident, which provide important design references for developing the potential heat transfer capacity, enhancing safe operation, and further optimization of PRHR HX in CAP1400.
机译：基于缩放的PRHR HX实验评估一组改性的传热式。然后，它们被编码为新开发的最佳估计PRHR-MHT码（PRHR HX改性的传热代码），用于评估CAP1400中特定C型PRHR HX的传热效应。在不同的工程操作条件下评估传统和改性式的适用性，估计总不确定性在2％以内。然后进行敏感分析以评估PRHR HX传热过程中改性式的影响因素。预测结果验证，在一些意外条件下，高达60％的温度差异可以在上部水平束区域中掉落，并且杆束效应以及交叉流动和气泡干扰也可以增强传热效果。计算结果证明，在ATWS事故下，PRHR HX设计具有足够的安全裕度，最高27.6％，为开发潜在的传热能力，增强安全操作以及CAP1400中的PRHR HX进一步优化提供重要的设计参考。

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