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RESEARCH PAPERS

Flow Through a Solar Chimney Power Plant Collector-to-Chimney Transition Section

[+] Author and Article Information
Carl F. Kirstein

Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa

Theodor W. von Backström

Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africatwvb@sun.ac.za

J. Sol. Energy Eng 128(3), 312-317 (Jan 27, 2006) (6 pages) doi:10.1115/1.2210502 History: Received June 01, 2005; Revised January 27, 2006

A solar chimney power plant consists of a large greenhouse-type collector surrounding a tall chimney. The air, heated within the collector, passes through an inlet guide vane (IGV)cascade and then through a transition section to a turbine that powers a generator. The transition section contains the turbine inlet guide vanes that support the whole chimney and guides the flow entering the turbine. The primary objective of the study was to determine the loss coefficient and mean exit swirl angle of the flow passing through the collector-to-chimney transition section of a full-scale solar chimney power plant as dependent on IGV stagger angle and collector roof height. Very good agreement was found between experimental values measured in a scaled model and commercial CFD code predictions of flow angles, velocity components, and internal and wall static pressures. The agreement between measured and predicted total pressure loss coefficient was reasonable when considering how small it is. The CFD code served to extend the predictions to a proposed full-scale geometry. Semi-empirical equations were developed to predict the loss coefficient and turbine mean inlet flow angles of solar chimney power plants as dependent on collector deck height and inlet guide vane setting angle. The two empirical equations may be useful in solar chimney plant optimization studies.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Solar chimney schematic

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Figure 2

Bell mouth facing a wall (Fried and Idelchik(11))

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Figure 3

Geometry of model collector-to-chimney transition section

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Figure 4

10deg sector showing row location and number for static pressure readings on the outer wall

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Figure 5

Schematic of five-hole probe traversing orthogonal array

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Figure 6

Outer wall static pressures, configuration D

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Figure 7

Velocities: row 7, configuration C, bottom

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Figure 8

Velocities: row 7, configuration C, middle

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Figure 9

Velocities: row 7, configuration C, top

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Figure 10

Pressures: row 7, configuration C, bottom

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Figure 11

Pressures: row 7, configuration C, middle

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Figure 12

Pressures: row 7, configuration C, top

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Figure 13

Angles: row 7, configuration C, bottom

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Figure 14

Angles: row 7, configuration C, middle

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Figure 15

Angles: row 7, configuration C, top

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Figure 16

Full-scale plant transition section exit average turning angle

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Figure 17

Full-scale plant transition section loss coefficient

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