Thermal characterization of prototypical ICS systems with immersed heat exchangers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Natural convection is measured in an enclosure that represents an integral collector storage solar system with an immersed heat exchanger. The enclosure has an aspect ratio of 9.3:1 and is inclined 30 deg to the horizontal. Heat transfer coefficients for bundles of 240 tubes are obtained for a range of transient operating modes and pitch-to-diameter ratios of 1.5, 2.4, and 3.3. Results for isothermal and stratified enclosures yield a correlation for the overall Nusselt number, NuD = (2.45±0.03)RaD 0.188, 230 ≤ RaD ≤ 9800. Nusselt numbers are three times larger than those for a similarly configured single-tube and an eight-tube bundle. This increase is attributed to stronger fluid motion within the bundle and greater overall circulation rates in the enclosure.

Original languageEnglish (US)
Title of host publicationInternational Solar Energy Conference
Number of pages10
StatePublished - 2004
Event2004 International Solar Energy Conference - Portland, OR, United States
Duration: Jul 11 2004Jul 14 2004


Other2004 International Solar Energy Conference
Country/TerritoryUnited States
CityPortland, OR


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