Effect of shroud and baffle on heat transfer in a solar thermal storage tank

S. K S Boetcher; F. A. Kulacki

doi:10.1115/HT2009-88413

Effect of shroud and baffle on heat transfer in a solar thermal storage tank

S. K S Boetcher
, F. A. Kulacki

Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

Enhancing heat transfer during the charge and discharge of solar thermal storage tanks is an ongoing technical challenge. The types of thermal storage systems considered in the present study comprise an immersed heat exchanger at the top of a solar thermal storage fluid. The discharge process of a thermal store with specified dimensions is numerically simulated over a range of Rayleigh numbers, 10⁵ < Ra_D <10⁷. The immersed heat exchanger is modeled as a two-dimensional isothermal cylinder which is situated near the top of a water-filled tank with adiabatic walls. An adiabatic shroud whose shape is parametrically varied is placed around the cylinder. In addition, the shroud is connected to an adiabatic baffle situated beneath the cylinder. Nusselt numbers are calculated for different shroud shapes at different Rayleigh numbers. Results show that the shroud is effective in increasing the heat transfer rate. Optimal shroud and baffle geometries are presented as well as qualitative flow results.

Original language	English (US)
Title of host publication	Proceedings of the ASME Summer Heat Transfer Conference 2009, HT2009
Pages	701-710
Number of pages	10
DOIs	https://doi.org/10.1115/HT2009-88413
State	Published - 2009
Event	2009 ASME Summer Heat Transfer Conference, HT2009 - San Francisco, CA, United States Duration: Jul 19 2009 → Jul 23 2009

Publication series

Name	Proceedings of the ASME Summer Heat Transfer Conference 2009, HT2009
Volume	1

Other

Other	2009 ASME Summer Heat Transfer Conference, HT2009
Country/Territory	United States
City	San Francisco, CA
Period	7/19/09 → 7/23/09

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

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10.1115/HT2009-88413

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Boetcher, SKS & Kulacki, FA 2009, Effect of shroud and baffle on heat transfer in a solar thermal storage tank. in Proceedings of the ASME Summer Heat Transfer Conference 2009, HT2009. Proceedings of the ASME Summer Heat Transfer Conference 2009, HT2009, vol. 1, pp. 701-710, 2009 ASME Summer Heat Transfer Conference, HT2009, San Francisco, CA, United States, 7/19/09. https://doi.org/10.1115/HT2009-88413

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title = "Effect of shroud and baffle on heat transfer in a solar thermal storage tank",

abstract = "Enhancing heat transfer during the charge and discharge of solar thermal storage tanks is an ongoing technical challenge. The types of thermal storage systems considered in the present study comprise an immersed heat exchanger at the top of a solar thermal storage fluid. The discharge process of a thermal store with specified dimensions is numerically simulated over a range of Rayleigh numbers, 105 < RaD <107. The immersed heat exchanger is modeled as a two-dimensional isothermal cylinder which is situated near the top of a water-filled tank with adiabatic walls. An adiabatic shroud whose shape is parametrically varied is placed around the cylinder. In addition, the shroud is connected to an adiabatic baffle situated beneath the cylinder. Nusselt numbers are calculated for different shroud shapes at different Rayleigh numbers. Results show that the shroud is effective in increasing the heat transfer rate. Optimal shroud and baffle geometries are presented as well as qualitative flow results.",

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note = "2009 ASME Summer Heat Transfer Conference, HT2009 ; Conference date: 19-07-2009 Through 23-07-2009",

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AU - Boetcher, S. K S

AU - Kulacki, F. A.

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N2 - Enhancing heat transfer during the charge and discharge of solar thermal storage tanks is an ongoing technical challenge. The types of thermal storage systems considered in the present study comprise an immersed heat exchanger at the top of a solar thermal storage fluid. The discharge process of a thermal store with specified dimensions is numerically simulated over a range of Rayleigh numbers, 105 < RaD <107. The immersed heat exchanger is modeled as a two-dimensional isothermal cylinder which is situated near the top of a water-filled tank with adiabatic walls. An adiabatic shroud whose shape is parametrically varied is placed around the cylinder. In addition, the shroud is connected to an adiabatic baffle situated beneath the cylinder. Nusselt numbers are calculated for different shroud shapes at different Rayleigh numbers. Results show that the shroud is effective in increasing the heat transfer rate. Optimal shroud and baffle geometries are presented as well as qualitative flow results.

AB - Enhancing heat transfer during the charge and discharge of solar thermal storage tanks is an ongoing technical challenge. The types of thermal storage systems considered in the present study comprise an immersed heat exchanger at the top of a solar thermal storage fluid. The discharge process of a thermal store with specified dimensions is numerically simulated over a range of Rayleigh numbers, 105 < RaD <107. The immersed heat exchanger is modeled as a two-dimensional isothermal cylinder which is situated near the top of a water-filled tank with adiabatic walls. An adiabatic shroud whose shape is parametrically varied is placed around the cylinder. In addition, the shroud is connected to an adiabatic baffle situated beneath the cylinder. Nusselt numbers are calculated for different shroud shapes at different Rayleigh numbers. Results show that the shroud is effective in increasing the heat transfer rate. Optimal shroud and baffle geometries are presented as well as qualitative flow results.

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BT - Proceedings of the ASME Summer Heat Transfer Conference 2009, HT2009

T2 - 2009 ASME Summer Heat Transfer Conference, HT2009

Y2 - 19 July 2009 through 23 July 2009

ER -

Effect of shroud and baffle on heat transfer in a solar thermal storage tank

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