Natural Convection From a Tube Bundle in a Thin Inclined Enclosure

[+] Author and Article Information
W. Liu, J. H. Davidson, F. A. Kulacki

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455

J. Sol. Energy Eng 126(2), 702-709 (May 04, 2004) (8 pages) doi:10.1115/1.1677432 History: Received July 01, 2003; Revised November 01, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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System concept for an unpressurized integral collector storage water heating system. The immersed heat exchanger is a tube bundle, or heat exchanger, e.g., for domestic hot water.
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Cross section of the experimental ICS with immersed tube bundle. Dimensions shown are in units of cm. H/H′ =3.3.
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(a) Thermocouple locations within the enclosure. Dimensions are shown in units of cm. (b) locations of the thermocouples (TCs. 18 to 35) to measure water temperatures within the tube bundle. Thermocouples are represented as solid circles. Notches in tube walls are locations of imbedded thermocouples.
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Centerline temperature distributions (x=0, y=5.08 cm) for charging an initially isothermal enclosure at 27°C with no heat transfer and a heat flux of 900 W/m2 (Run 1). Data points for the eight-tube case are based on readings of TCs. 7–10, 14, and 18–21. At t=8 h, ST of the entire enclosure is 182°C2 . For a single tube heat exchanger, ST of the entire enclosure is 177°C2 after 7 h of charging.
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Temperatures during discharge of an initially isothermal enclosure (Run 3). Cooling proceeds generally uniformly over the entire enclosure except above the tube bundle (TC 21 and 22). See Fig. 3 for locations of thermocouples.
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Temperatures along the mid y-z plane (x=0) for 0.4<t<0.9 h during discharge (Run 3)
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Temperature differences that drive natural convection during discharge of an initially isothermal enclosure without heat input (Run 3)
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Temperatures in the enclosure for combined charge with discharge with an initially isothermal enclosure (Run 8). The applied heat flux is 900 W/m2 .
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Temperature distribution along the horizontal line in the mid y-z plane (x=0) for t=0.4 to 0.9 h in the combined charge with discharge experiment (Run 8)
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Time-averaged temperatures for Run 8. Values inside the tubes are average tube outer wall temperature. All temperatures are in °C.
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Nusselt and Rayleigh number data for Runs 2 to 9. The dashed lines show the ±15% band of the correlation. The uncertainty in the Nusselt and Rayleigh numbers is ±2% at RaD=1.4×107 and ±10% at RaD=4.0×105.




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