| 摘要: |
| 在“3060双碳目标”背景下，能源高效输运与合理利用是实现碳中和的重要路径之一，而换热器在能量输运与转换中的作用至关重要。相较于传统换热器，微通道换热器在维持同等换热能力的同时，大幅减小了体积，极大提高了传热效率，在很多重要领域均有应用。超临界CO2 (S-CO2)发电系统、跨临界热泵和制冷系统等因环境友好和效率高等优势，在“双碳目标”背景下具有重要的应用前景。S-CO2物性剧烈变化以及系统对高温高压的要求，对换热器设计、耐高温高压、高紧凑和高效率都提出巨大挑战，成为科学界和工业界研究的热点话题，且近几十年相关研究也取得了重要进展。为了全面回顾微通道换热器在S-CO2系统中的研究进展，本文从S-CO2的传热流动特性出发，分析了管内S-CO2换热的影响因素与现有微通道换热器对S-CO2系统的适用性。重点论述了印刷电路板式换热器(PCHE)不同结构形式及设计优化方法，最后讨论了PCHE的优化对整个S-CO2系统的性能提升的影响。本文对S-CO2微通道换热器进行了全面的论述，可为以CO2或其它超临界工质为媒介的能源动力系统换热器的选型、设计和优化提供重要参考。 |
| 关键词: 微通道换热器 印刷电路板式换热器 优化设计 强化换热 超临界CO2 |
| DOI： |
| Received:April 26, 2023Revised:June 20, 2023 |
| 基金项目:中国科学院稳定支持基础研究领域青年团队计划项目(YSBR - 043) |
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| Research Progress in Supercritical CO2 Microchannel Heat Exchangers |
|
Huang Junjie1,2, Han Zengxiao3,4, Guo Jiangfeng3,4,5,2, Huai Xiulan3,4,6
|
| (1.nstitute of Engineering Thermophysics, Chinese Academy of Sciences;2.Nanjing Institute of Future Energy System;3.Institute of Engineering Thermophysics, Chinese Academy of Sciences;4.School of Engineering Science, University of Chinese Academy of Sciences;5.Department of Chemical Engineering, Imperial College London;6.Nanjing Institute of Future Energy System, Nanjing) |
| Abstract: |
| In the context of the "3060 carbon peaking and carbon neutrality goals", promoting energy-efficient transportation and rational utilization is one of the important paths to achieve carbon neutrality, where heat exchangers are known to play a crucial role. Compared with traditional heat exchangers, microchannel heat exchangers significantly reduce the volume while maintaining the same heat exchange capacity. They also significantly improve the heat exchange efficiency and have applications in many important fields. For example, supercritical CO2 (S-CO2) power generation systems, transcritical heat pumps, and refrigeration systems have important application prospects as they are environmentally friendly and offer high-efficiency advantages in the context of the "dual carbon target." Drastic changes in the properties of S-CO2 and the high-temperature and high-pressure requirements of the system pose significant challenges to heat exchanger design, high-temperature and high-pressure resistance, compactness, and efficiency. Therefore, S-CO2 heat exchangers have become a hot topic in scientific and industrial research. In recent decades, significant progress has been made in related research. This paper comprehensively reviews the research progress of microchannel heat exchangers in S-CO2 systems. The paper focuses on different structural forms and design optimization methods of printed circuit heat exchangers (PCHE) and discusses the impact of PCHE optimization on the performance improvement of the entire S-CO2 system. This review provides a comprehensive discussion of S-CO2 microchannel heat exchangers and provides an important reference for the selection, design, and optimization of heat exchangers in systems using CO2 or other supercritical working fluids as the working media for power generation, heat pumps, and refrigeration. |
| Key words: microchannel heat exchanger printed circuit heat exchanger optimization design heat transfer enhancement supercritical CO2 |
