Performance of solar water heaters with narrow mantle heat exchangers

Y. C. Soo Too, G. L. Morrison*, M. Behnia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


This paper evaluates the performance of narrow-gap vertical mantle heat exchangers with a two-pass arrangement for use in pumped-circulation solar water heaters. Both measured mantle side and tank side heat transfer correlations have been developed and implemented in a TRNSYS model of a complete solar water heater incorporating this type of heat exchanger. Predictions of the annual solar contribution for mantle-tank systems are compared to direct-coupled systems. The direct-coupled systems are found to provide slightly higher annual energy saving than mantle-tank systems for standard domestic hot water demand in Australia. However, the reduction in performance is outweighed by the benefit of freeze protection provided by incorporating a collector loop heat exchanger in the system.

Original languageEnglish
Pages (from-to)350-362
Number of pages13
JournalSolar Energy
Issue number3
Publication statusPublished - Mar 2009
Externally publishedYes


  • Mantle heat exchanger
  • Solar water heater


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