Water-in-glass evacuated tube solar water heaters

G. L. Morrison*, I. Budihardjo, M. Behnia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

224 Citations (Scopus)


Evacuated tube solar collectors have better performance than flat-plate solar collectors, in particular for high temperature operations. A number of heat extraction methods from all-glass evacuated tubes have been developed and the water-in-glass concept has been found to be the most successful due to its simplicity and low manufacturing cost. In this paper, the performance of a water-in-glass evacuated tube solar pre-heater is investigated using the International Standard test method ISO 9459-2 for a range of locations. Factors influencing the operation of water-in-glass collector tubes are discussed and a numerical study of water circulation through long single-ended thermosyphon tubes is presented. Preliminary numerical simulations have shown the existence of inactive region near the sealed end of the tube which might influence the performance of the collector.

Original languageEnglish
Pages (from-to)135-140
Number of pages6
JournalSolar Energy
Issue number1-3
Publication statusPublished - Jan 2004
Externally publishedYes


Dive into the research topics of 'Water-in-glass evacuated tube solar water heaters'. Together they form a unique fingerprint.

Cite this