Natural convection from a horizontal tube heat exchanger immersed in a tilted enclosure

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Abstract

Heat transfer rates of a single horizontal tube immersed in a water-filled enclosure tilted at 30 deg are measured. The results serve as a baseline case for a solar water heating system with a heat exchanger immersed in an integral collector storage. Experiments are conducted for isothermal and stratified enclosures with both adiabatic and uniform heat flux boundary conditions. Natural convection flow in the enclosure is interpreted from measured water temperature distributions. Formation of an appropriate temperature difference that drives natural convection is determined. Correlations for the overall heat transfer coefficient in terms of the Nusselt and Rayleigh numbers are reduced to the form NuD=0.675RaD0.25 for 9 × 105 ≤ RaD ≤ 4 × 107.

Original languageEnglish (US)
Pages (from-to)67-75
Number of pages9
JournalJournal of Solar Energy Engineering, Transactions of the ASME
Volume125
Issue number1
DOIs
StatePublished - Feb 1 2003

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Tubes (components)
Enclosures
Natural convection
Water
Heat transfer coefficients
Heat exchangers
Heat flux
Temperature distribution
Boundary conditions
Heat transfer
Heating
Experiments
Temperature

Cite this

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abstract = "Heat transfer rates of a single horizontal tube immersed in a water-filled enclosure tilted at 30 deg are measured. The results serve as a baseline case for a solar water heating system with a heat exchanger immersed in an integral collector storage. Experiments are conducted for isothermal and stratified enclosures with both adiabatic and uniform heat flux boundary conditions. Natural convection flow in the enclosure is interpreted from measured water temperature distributions. Formation of an appropriate temperature difference that drives natural convection is determined. Correlations for the overall heat transfer coefficient in terms of the Nusselt and Rayleigh numbers are reduced to the form NuD=0.675RaD0.25 for 9 × 105 ≤ RaD ≤ 4 × 107.",
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AU - Davidson, Jane H.

AU - Kulacki, F. A.

AU - Mantell, Susan C.

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AB - Heat transfer rates of a single horizontal tube immersed in a water-filled enclosure tilted at 30 deg are measured. The results serve as a baseline case for a solar water heating system with a heat exchanger immersed in an integral collector storage. Experiments are conducted for isothermal and stratified enclosures with both adiabatic and uniform heat flux boundary conditions. Natural convection flow in the enclosure is interpreted from measured water temperature distributions. Formation of an appropriate temperature difference that drives natural convection is determined. Correlations for the overall heat transfer coefficient in terms of the Nusselt and Rayleigh numbers are reduced to the form NuD=0.675RaD0.25 for 9 × 105 ≤ RaD ≤ 4 × 107.

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