Numerical study of conduction and radiation heat losses from vacuum annulus in parabolic trough receivers
作者机构：Key Laboratory of Solar Thermal Energy and Photovoltaic SystemChinese Academy of SciencesBeijing 100190China Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China Beijing Engineering Research Center of Solar Thermal PowerBeijing 100190China
出 版 物：《Frontiers in Energy》 (能源前沿（英文版）)
年 卷 期：2022年第16卷第6期
页 面：1048-1059页
核心收录：
学科分类：0808[工学-电气工程] 07[理学] 0807[工学-动力工程及工程热物理] 0701[理学-数学]
基 金：funded by the National Key R&D Program of China(No.2019YFE0102000) the National Natural Science Foundation of China(Grant No.51476165).
主 题：parabolic trough receiver vacuum annulus rarefied gas DSMC(direct simulation Monte Carlo) heat loss
摘 要：Parabolic trough receiver is a key component to convert solar energy into thermal energy in the parabolic trough solar system.The heat loss of the receiver has an important influence on the thermal efficiency and the operating cost of the power station.In this paper,conduction and radiation heat losses are analyzed respectively to identify the heat loss mechanism of the receiver.A 2-D heat transfer model is established by using the direct simulation Monte Carlo method for rarefied gas flow and heat transfer within the annulus of the receiver to predict the conduction heat loss caused by residual gases.The numerical results conform to the experimental results,and show the temperature of the glass envelope and heat loss for various conditions in detail.The effects of annulus pressure,gas species,temperature of heat transfer fluid,and annulus size on the conduction and radiation heat losses are systematically analyzed.Besides,the main factors that cause heat loss are analyzed,providing a theoretical basis for guiding the improvement of receiver,as well as the operation and maintenance strategy to reduce heat loss.
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