Straight-through all-glass evacuated tube solar collector for low and medium temperature applications

Jing hu Gong, Zheng Jiang, Xian feng Luo, Bin Du, Jun Wang*, Peter D. Lund

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


A straight-through all-glass evacuated tube collector (ETC) made of high-quality borosilicate glass was developed for large-scale low and medium temperature solar hot water systems. It consists of an inner and outer tube without a free end and was shown to be mechanically stable with a thermal expansion coefficient of (3.3 ± 0.1) × 10−6 K−1. Due to turbulent conditions in the straight-through all-glass tube, a higher heat transfer rate could be achieved than in a Dewar-tube ETC, leading to increased heat extraction and decreased heat losses. The photo-thermal efficiency was improved, indicating that a straight-through tube could be more cost-effective. At the same time, active flow in the tube can result in a better water quality as the accumulation time in the tube was short.

Original languageEnglish
Pages (from-to)935-943
Number of pages9
JournalSolar Energy
Publication statusPublished - 1 May 2020
MoE publication typeA1 Journal article-refereed


  • Large-scale solar water system
  • Medium and low temperature
  • Photo-thermal efficiency
  • Straight-through all-glass evacuated tube

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