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Research Papers

Combined Convective-Radiative Thermal Analysis of an Inclined Rooftop Solar Chimney

[+] Author and Article Information
Charline Seytier

Principal
ThermaVerde,
54 Bis Avenue Georges Clémenceau,
Noisy le Grand, 93160 France
e-mail: charline.seytier@themaverde.fr

Mohammad H. Naraghi

Professor
ASME Fellow
Department of Mechanical Engineering,
Manhattan College,
Riverdale, NY 10471
e-mail: mohammad.naraghi@manhattan.edu

1The work was performed when the lead author was a graduate student as a part of dual Master program with ECAM, Lyon, France.

2Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received August 22, 2011; final manuscript received June 13, 2012; published online August 9, 2012. Assoc. Editor: Gregor P. Henze.

J. Sol. Energy Eng. 135(1), 011009 (Aug 09, 2012) (8 pages) Paper No: SOL-11-1182; doi: 10.1115/1.4007090 History: Received August 22, 2011; Revised June 13, 2012

A model for the combined spectral radiative and convective heat transfer analysis of solar chimneys is developed. The radiation part of this model is based on the spectral distribution of the solar heat flux and spectral radiative properties of solar chimney components. Two approaches are used for the convective part of this model, empirical correlations and a CFD analysis. The empirical correlations are based on the stack effect correlation for airflow motion and a convective heat transfer correlation for the heat transfer coefficient. The empirical correlations are used to obtain an initial estimation of surface temperatures, which are then used in the CFD model to determine an improved estimation of the heat transfer coefficients and airflow rate. Iterating between the spectral radiative and the CFD models resulted in a converged set of values for the solar chimney airflow rate and its thermal characteristics. The model is used to predict the airflow rate for various configurations and solar irradiances of solar chimneys.

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References

Figures

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Fig. 1

Schematic of an inclined solar chimney

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Fig. 2

Schematics radiative energy transfer in a solar chimney

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Fig. 3

Overall flow chart of the calculation model

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Fig. 4

Airflow rate convergence

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Fig. 5

Absorbing plate and glass temperatures temperature versus solar flux for a 60 deg slope and 0.1 m air gap chimney

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Fig. 6

Volume flow rate for 2 m height and 60 deg slope

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Fig. 7

Airflow rate for 2 m height and 45 deg slope

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Fig. 8

Airflow rate for 2 m height and 30 deg slope

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Fig. 9

Velocity vectors colored by velocity magnitude in m/s for a chimney design of 60 deg slope and thickness of 0.1 m

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Fig. 10

Velocity vectors colored by velocity magnitude in m/s for a chimney design of 60 deg slope and 0.2 m thick

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