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- Publisher
- Springer Journals
- Copyright
- Copyright © Higher Education Press 2020
- ISSN
- 2095-1701
- eISSN
- 2095-1698
- DOI
- 10.1007/s11708-020-0670-7
- Publisher site
- See Article on Publisher Site
Abstract
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.
Journal
Frontiers in Energy – Springer Journals
Published: Dec 1, 2022
Keywords: parabolic trough receiver; vacuum annulus; rarefied gas; DSMC (direct simulation Monte Carlo); heat loss