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Research Papers

Modeling and Analysis of an Efficient Porous Media for a Solar Porous Absorber With a Variable Pore Structure

[+] Author and Article Information
P. Wang

Department of Renewable Energy,
Hohai University,
Nanjing 210029, China;
Department of Mechanical Engineering,
University of California,
Riverside, CA 92521

K. Vafai

Fellow ASME
Department of Mechanical Engineering,
University of California,
Riverside, CA 92521
e-mail: vafai@engr.ucr.edu

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received April 9, 2017; final manuscript received June 27, 2017; published online July 18, 2017. Editor: Robert F. Boehm.

J. Sol. Energy Eng 139(5), 051005 (Jul 18, 2017) (7 pages) Paper No: SOL-17-1135; doi: 10.1115/1.4037161 History: Received April 09, 2017; Revised June 27, 2017

A theoretical mathematical model that considers the continuous linear porosity or pore diameter distribution is established to develop a novel porous absorber with variable pore structure, which will result in a thermopressure drop improvement. Efficient performance can be achieved based on reconstruction of the velocity, temperature, and radiation fields. Collimated and diffusive radiative heat fluxes and the heat loss mechanism from the irradiated surface are analyzed in the presence of the volumetric effect. This study analyzes three typical linear pore structure distributions: increasing (I), decreasing (D), and constant (C) types, respectively. In general, the D type porosity (φ) layout combined with the I type pore diameter (dp) distribution would be an excellent pore structure layout for a porous absorber.

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References

Figures

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Fig. 1

Schematic for the linear distribution (D and I type layout) of the pore structure of the absorber

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Fig. 2

Comparison between the I and D type porosity layout on the temperature and heat flux fields along the X axis: (a) dimensionless temperature θ and (b) dimensionless heat flux Ψ (dp = 2 mm and q0 = 1 MW/m2)

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Fig. 3

Effect of the porosity distribution gradient on the temperature and heat flux fields along the X axis: (a) dimensionless temperature θ and (b) dimensionless heat flux Ψ (dp = 2 mm and q0 = 1 MW/m2)

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Fig. 4

Effect of φo on the temperature and heat flux distributions along the X axis under D type porosity layout: (a) dimensionless temperature θ and (b) dimensionless heat flux Ψ (dp = 2 mm and q0 = 1 MW/m2) (see color figure online)

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Fig. 5

Comparison between the I and D type pore diameter layout on the temperature and heat flux fields along the X axis: (a) dimensionless temperature θ and (b) dimensionless heat flux Ψ (φ = 0.7 and q0 = 1 MW/m2)

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Fig. 6

Effect of do on the temperature and heat flux distributions along the X axis under the I type pore diameter layout: (a) dimensionless temperature θ and (b) dimensionless heat flux Ψ (φ = 0.7 and q0 = 1 MW/m2)

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