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Research Papers

Effects of Novel Collector Roof on Solar Chimney Power Plant Performance

[+] Author and Article Information
Fifi N. M. Elwekeel

Faculty of industrial Education,
Helwan University,
Cairo 11813, Egypt
e-mail: fifinew2000@yahoo.com

Antar M. M. Abdala

Faculty of Engineering,
Matareya branch,
Helwan University,
Cairo 11718, Egypt
e-mail: antar451@yahoo.com

Muhammad Mustafizur Rahman

Department of Mechanical Engineering,
Wichita State University,
Wichita, KS 67260-0133
e-mail: muhammad.rahman@wichita.edu

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 February 15, 2018; final manuscript received August 28, 2018; published online October 1, 2018. Assoc. Editor: Aranzazu Fernandez Garcia.

J. Sol. Energy Eng 141(3), 031004 (Oct 01, 2018) (16 pages) Paper No: SOL-18-1076; doi: 10.1115/1.4041403 History: Received February 15, 2018; Revised August 28, 2018

The effects of collector roughness shape on the performance of solar chimney power plant were investigated in this study. The roughness shapes of triangular, curved, and square grooves were chosen and were compared to smooth case. The performance parameters of solar radiation, updraft velocity, temperature distribution, static pressure, power, and Nusselt number were varied. The effects of number, position, height, and width of the grooves on the performance were investigated. The results of this investigation show that the updraft velocity with the triangular groove increases by 1.5 times compared to the smooth case at solar radiation of 1000 W/m2. At solar radiation of 1000 W/m2, the power increases by 169%, 96%, and 19% for triangular, curved, and square grooves, respectively, compared to the smooth case. Moreover, the Nusselt number values with triangular groove and curved groove enhance by 42% and 26%, respectively, compared to the smooth case. The power increases by 1.98% for three grooves instead of using one groove at higher solar radiation. Increasing the groove height by 1.7 times, the power increases by 1.03 times at higher solar radiation. The power enhancement shows less sensitivity to the change of groove width at higher solar radiation.

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Figures

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Fig. 1

(a) SCPP with smooth collector roof, (b) SCPP with rough collector roof, and (c) grooved collector roofs with different numbers and dimensions

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Fig. 2

Updraft velocity with solar radiation

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Fig. 3

Power against solar radiation

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Fig. 4

Velocity distribution over collector radius

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Fig. 5

Streamlines pattern

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Fig. 6

Velocity contours at different solar radiation

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Fig. 7

Static pressure contours at varied solar radiation

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Fig. 8

Temperature distribution at different solar radiation

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Fig. 9

Turbulence kinetic energy for smooth and rough collector roofs

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Fig. 10

Updraft velocity against solar radiation for different collector roofs

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Fig. 11

Power variation with solar radiation for different collector roofs

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Fig. 12

Nu against daytime for different collector roofs

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Fig. 13

Velocity contours for different numbers of triangular grooves

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Fig. 14

Power of different numbers of triangular grooves

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Fig. 15

Relation among velocity and groove heights

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Fig. 16

Effects of groove heights on the power

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Fig. 17

The velocity contours and groove width

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Fig. 18

Relation between groove width and power

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