Thermal characterization of prototypical integral collector storage systems with immersed heat exchangers

W. Liu; J. H. Davidson; F. A. Kulacki

doi:10.1115/1.1824106

Thermal characterization of prototypical integral collector storage systems with immersed heat exchangers

W. Liu, J. H. Davidson, F. A. Kulacki

Mechanical Engineering

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Abstract

Natural convection is measured in an enclosure that represents an integral collector storage system (ICS) with an immersed tube-bundle heat exchanger. Heat transfer coefficients for bundles of 240 tubes contained in a thin enclosure of aspect ratio of 9.3:1 and inclined at 30 deg to the horizontal 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 Nu_D = (2.45 ±0.03)Ra _D^0.188, 230≤Ra_D≤9800. The characteristic temperature difference in the Rayleigh number is that between the average water temperature within the bundle and the tube wall temperature. 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 higher overall large scale circulation rates in the enclosure.

Original language	English (US)
Pages (from-to)	21-28
Number of pages	8
Journal	Journal of Solar Energy Engineering, Transactions of the ASME
Volume	127
Issue number	1
DOIs	https://doi.org/10.1115/1.1824106
State	Published - Feb 2005

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abstract = "Natural convection is measured in an enclosure that represents an integral collector storage system (ICS) with an immersed tube-bundle heat exchanger. Heat transfer coefficients for bundles of 240 tubes contained in a thin enclosure of aspect ratio of 9.3:1 and inclined at 30 deg to the horizontal 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)Ra D0.188, 230≤RaD≤9800. The characteristic temperature difference in the Rayleigh number is that between the average water temperature within the bundle and the tube wall temperature. 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 higher overall large scale circulation rates in the enclosure.",

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Thermal characterization of prototypical integral collector storage systems with immersed heat exchangers

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