Heat exchange capability of main heat exchangers in pressurized water test loop under low parameter conditions during fuel assembly irradiation

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-05-06 DOI:10.1016/j.csite.2025.106276

Junping Si, Guang Zhao, Yun Wang, Mingyan Tong, Jinkang Cheng, Jin Lei, Hongwei Wu, Yueyan Song, Yongqiang Li, Yong Luo

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Abstract

The steady-state irradiation test for fuel assemblies is a key aspect of nuclear reactor fuel development, for revealing irradiation resistance and verifying the safety of new fuel assemblies before engineering application. The impact of low parameter conditions on the heat transfer capacity of main heat exchangers in the pressurized high-temperature water test loop was studied. A segmented fitting method for determining flow turning points was established, and proposals for series-parallel configurations and new regenerative heat exchanger designs were presented. It is shown that the total heat exchange power of two main heat exchangers operating in parallel is not always greater than that of a single unit. There exists a flow turning point, and above this point, operating the two main heat exchangers in parallel is beneficial. Through segmented fitting, the flow turning points at different inlet water temperatures can be obtained. The average difference in turning points obtained from fitting and calculations is only 0.6 %, with a corresponding average power deviation of 1.8 %. Besides, for low parameter operating conditions, the issues of insufficient heat exchange power can be addressed by using a series connection of the main heat exchangers and adjusting the heat exchange area of the regeneration section.

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燃料组件辐照低参数条件下压水堆试验回路主热交换器的换热性能

核反应堆燃料组件稳态辐照试验是核反应堆燃料开发的一个关键环节，用于在工程应用前揭示新燃料组件的耐辐照性和验证其安全性。研究了低参数条件对高压高温水试验回路主换热器换热能力的影响。建立了一种确定流动拐点的分段拟合方法，提出了串并联配置和新型蓄热式换热器的设计建议。结果表明，并联运行的两台主换热器的总换热功率并不总是大于单机的总换热功率。存在一个流量转折点，在这个转折点以上，两个主换热器并联运行是有益的。通过分段拟合，可以得到不同进水温度下的流量拐点。从拟合和计算中得到的拐点的平均差异仅为0.6%，相应的平均功率偏差为1.8%。此外，对于低参数工况，采用主换热器串联连接，并调整再生段换热面积，可以解决换热功率不足的问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.