A review on application and heat transfer enhancement of supercritical CO2 in low-grade heat conversion
A review on application and heat transfer enhancement of supercritical CO2 in low-grade heat conversion
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超临界CO2在低品位换热中的应用及强化传热研究进展
DOI：
10.1016/j.apenergy.2020.114962
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发表时间：
2020-07
期刊：
影响因子：
11.2
通讯作者：
Chaobin Dang
中科院分区：
文献类型：
--
作者：
Shijie Zhang;Xiaoxiao Xu;Chao Liu;Chaobin Dang
跨临界CO2Rankine系统是一种低品位热利用的新技术，具有较高的能量转换效率和较高的经济效益。燃气加热器是超临界CO_2朗肯系统中最重要的部件之一，由于超临界CO_2的高压和热物性突变，对其实际应用提出了严峻的挑战。本文的目的是提供低品位热转化中跨临界CO_2朗肯循环的基本背景知识，并对考虑热电联产的超临界CO_2运行的实验研究和演示进行综述。由于超临界CO2的换热判据和强化对其在实际紧凑型换热器设计和系统运行中的应用至关重要，因此本文进一步讨论了超临界CO2在供热系统中的湍流对流换热及其强化途径。对换热机理、换热判据及其推导和评价方法进行了全面的总结，以期为系统运行、换热器设计和强化换热提供参考。指出了现有研究的一些不足之处。在此基础上，介绍了强化换热的基本思路和方法，并讨论了换热准则在强化换热中的应用。最后，提出了超临界换热的后续研究方向和强化措施。
Trans-critical CO2Rankine system is a new technology for low-grade heat utilization which has high energy conversion efficiency and exergo-economic efficiency. The gas heater is one of the most important components in trans-critical CO2Rankine system, which is a crucial challenge for its practical application because of high pressure and abrupt change in thermo-physical properties of supercritical CO2.The aim of this paper is to provide basic background knowledge on trans-critical CO2Rankine cycle in low-grade heat conversion and present a review of experimental tests and demonstrations on supercritical CO2operation considering heat-to-power systems. Since the heat transfer criteria and enhancement of supercritical CO2is vital for its application in the real-scale compact heat exchanger design and system operation, this review further discusses the turbulent convective heat transfer and its enhancement approaches of supercritical CO2in heating system. A comprehensive summary of the heat transfer mechanisms and criteria as well as their derivation and evaluation methods is conducted to provide some references for the system operation, heat exchanger design and heat transfer enhancement. Some of the shortcomings of the existing research are pointed out. Based on the above discussion, this review presents the basic ideas and approaches of heat transfer enhancement and discus the application of heat transfer criteria in heat transfer enhancements. Finally, the authors bring forward the way of latter researching of supercritical heat transfer and enhanced measures.
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