Outdoor testing of evacuated-tube heat-pipe solar collectors

K. C. Ng, C. Yap*, T. H. Khor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The paper presents the steady state performance of two types of commercially available evacuated-tube heat-pipe solar collector that were tested under the meteorological conditions of Singapore. The tests were made in arrays of collectors in contrast with the normal tests performed under controlled laboratory conditions. A theoritical model is also presented to predict the collector efficiency as well as the collectable energy during a steady state test. Within the range of expected coolant temperatures, the efficiency and the heat loss coefficient of collectors are measured and a linear expression can adequately depict their characteristics.

Original languageEnglish (US)
Pages (from-to)23-30
Number of pages8
JournalProceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
Issue number1
StatePublished - 2000
Externally publishedYes


  • Efficiency prediction
  • Evacuated-tube collectors
  • Heat-pipe collectors
  • Steady state method

ASJC Scopus subject areas

  • Mechanical Engineering


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