Natural circulation flow through water-in-glass evacuated tube solar collectors

Indra Budihardjo, Graham L. Morrison*, Masud Behnia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)


Experimental and numerical investigations were undertaken to develop a correlation for natural circulation flow rate through single-ended water-in-glass evacuated tubes mounted over a diffuse reflector. The circulation flow rate was correlated in terms of solar input, tank temperature, collector inclination and tube aspect ratio. The sensitivity of the flow rate correlation to the variation in circumferential heat flux distribution was also investigated.

Original languageEnglish
Pages (from-to)1460-1472
Number of pages13
JournalSolar Energy
Issue number12
Publication statusPublished - Dec 2007
Externally publishedYes


  • Circulation flow rate
  • Water-in-glass evacuated tubes


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