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Open AccessFeature PaperArticle

Experimental Study on Vacuum Performance of Parabolic Trough Receivers based on a Novel Non-destructive Testing Method

by Fangyuan Yao 1,2,3,4, Dongqiang Lei 1,2,3,4,*, Ke Yu 5, Yingying Han 5, Pan Yao 1,2,3,4, Zhifeng Wang 1,2,3,4, Quanxi Fang 5 and Qiao Hu 5
1
Key Laboratory of Solar Thermal Energy and Photovoltaic System, Chinese Academy of Sciences, Beijing 100190, China
2
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
Beijing Engineering Research Center of Solar Thermal Power, Beijing 100190, China
5
Royal Tech CSP Limited, Changzhou 213163, Jiangsu, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(23), 4531; https://doi.org/10.3390/en12234531
Received: 5 November 2019 / Revised: 26 November 2019 / Accepted: 26 November 2019 / Published: 28 November 2019
(This article belongs to the Special Issue Research on Solar Collector)
The loss of vacuum in the parabolic trough receivers is one of the most common problems in the parabolic trough solar power plants. The vacuum level and gas species in the annulus of the receiver determine the heat loss and have an important influence on the thermal efficient of the solar system. If hydrogen is inside the annulus, it can cause heat losses to be almost four times that of a receiver with good vacuum. However, it is hard to non-destructively measure the gas species and partial pressure in the annulus of the receiver. In this paper, a novel non-destructive method was presented to evaluate the vacuum performance by using combined dielectric barrier discharge and the spectral analysis technology. The discharge characteristics and spectrometric properties of four kinds of gases, which are the most likely gases to be found in the receivers, were studied in the experiments. The test results of the non-destructive vacuum evaluation method agree well with the results of the residual gas analysis. The feasibility and accuracy of the non-destructive test method was verified. The relationship between the vacuum performance of receiver and the spectral characteristics of dielectric barrier discharge were obtained by a series of experiments. View Full-Text
Keywords: parabolic trough receiver; vacuum performance; partial vacuum pressure; optical fiber spectrometer; gas discharge parabolic trough receiver; vacuum performance; partial vacuum pressure; optical fiber spectrometer; gas discharge
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MDPI and ACS Style

Yao, F.; Lei, D.; Yu, K.; Han, Y.; Yao, P.; Wang, Z.; Fang, Q.; Hu, Q. Experimental Study on Vacuum Performance of Parabolic Trough Receivers based on a Novel Non-destructive Testing Method. Energies 2019, 12, 4531.

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