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Research Papers

Heat Transfer Analysis of a Solid-Solid Heat Recuperation System for Solar-Driven Nonstoichiometric Redox Cycles

[+] Author and Article Information
Wojciech Lipiński

e-mail: lipinski@umn.edu
Department of Mechanical Engineering,
University of Minnesota,
111 Church Street S.E.,
Minneapolis, MN 55455

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received April 3, 2012; final manuscript received December 17, 2012; published online March 22, 2013. Editor: Gilles Flamant.

J. Sol. Energy Eng 135(3), 031004 (Mar 22, 2013) (11 pages) Paper No: SOL-12-1089; doi: 10.1115/1.4023357 History: Received April 03, 2012; Revised December 17, 2012

Heat transfer is predicted for a solid-solid heat recuperation system employed in a novel directly-irradiated solar thermochemical reactor realizing a metal oxide based nonstoichiometric redox cycle for production of synthesis gas from water and carbon dioxide. The system is designed for continuous operation with heat recuperation from a rotating hollow cylinder of a porous reactive material to a counter-rotating inert solid cylinder via radiative transfer. A transient heat transfer model coupling conduction, convection, and radiation heat transfer predicts temperatures, rates of heat transfer, and the effectiveness of heat recovery. Heat recovery effectiveness of over 50% is attained within a parametric study of geometric and material parameters corresponding to the design of a two-step solar thermochemical reactor.

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References

Figures

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Fig. 1

Conceptual sketch of a solar thermochemical reactor realizing a nonstoichiometric partial redox cycle with solid-solid heat recuperation. The outer cylinder consists of a reactive porous medium and cycles between the reduction zone at high temperature and oxidation zone at low temperature. The inner cylinder is a chemically inert heat recuperating solid.

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Fig. 2

Schematic of the model solid-solid heat recuperation system showing the two counter-rotating solid cylinders, and the outer system boundary

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Fig. 3

Sample of structured cylindrical grid cell, with coordinate system used in numerical analysis

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Fig. 4

Steady-state radially average temperatures of the outer cylinder obtained using the Monte Carlo ray tracing method in variant A and the Rosseland diffusion approximation in variant B

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Fig. 5

Steady-state temperature distribution in the heat recuperation system for the baseline case. Direction of rotation is indicated on cylinders.

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Fig. 6

Steady-state (a) radially averaged temperatures of the outer and inner cylinders and (b) heat flux from the inner to the outer cylinder for the baseline case. The outer cylinder rotates in the direction of increasing θ.

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Fig. 7

Effect of extinction coefficient on heat recovery effectiveness

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Fig. 8

Effect of extinction coefficient on maximum radially averaged temperature of the outer cylinder

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Fig. 9

Effect of surface emissivity of the outer cylinder on heat recovery effectiveness

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Fig. 10

Effect of emissivity of inner cylinder surface on heat recovery effectiveness

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Fig. 11

Effect of thermal conductivity of the inner cylinder on heat recovery effectiveness

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Fig. 12

Effect of thermal conductivity of the inner cylinder on maximum radially averaged temperature of the outer cylinder

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Fig. 13

Effect of cylinder wall thickness on heat recovery effectiveness

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Fig. 14

Effect of cylinder wall thickness on maximum radially averaged temperature of the outer cylinder

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Fig. 15

Effect of ratio of inner to outer cylinder wall thickness on heat recovery effectiveness

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Fig. 16

Effect of rotation speed on heat recovery effectiveness

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