Research Papers

Numerical Investigation of Thermal Characteristics in a Solar Chimney Project

[+] Author and Article Information
Hongtao Xu

e-mail: htxu@usst.edu.cn

Mo Yang

School of Energy and Power Engineering,
University of Shanghai for Science and
Shanghai 200093, China

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received August 10, 2012; final manuscript received May 15, 2013; published online xx xx, xxxx. Assoc. Editor: Yves Gagnon.

J. Sol. Energy Eng 136(1), 011008 (Jul 16, 2013) (7 pages) Paper No: SOL-12-1197; doi: 10.1115/1.4024742 History: Received August 10, 2012; Revised May 15, 2013

In order to create interior multiclimate zones suitable for plant cultivation in a solar chimney project proposed for the World Horticultural Exposition 2016 in China, the numerical investigation is performed to a solar chimney with 2 km radius and 1 km height. The simulation methodology is validated by experimental data. The impacts of inlet height and radius to interior thermal characteristics are evaluated. It is found that the temperature field is much similar when the inlet height decreases from 3.8 m to 0.5 m. With further decrease of the inlet height to 0.2 m, its impact to temperature field is significant. The temperature field is similar though the radius of solar chimney decreases from 2.0 km to 1.725 km. Further decrease to 1.13 km results in much lower temperature field as less radiate heat is obtained. The procedure of soil surface temperature calculation is also proposed to obtain the supplementary heat amount maintaining the required temperature for plant cultivation.

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Fig. 4

Physical configurations of the prototype

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Fig. 5

Mass flow rate comparisons between simulation and measurement in the chimney prototype

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Fig. 3

Grids in the axisymmetric model

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Fig. 2

Configuration of the proposed solar chimney project

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Fig. 1

Solar Chinmey prototype on 2010 Shanghai World Expo

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Fig. 6

Inlet height impact to average temperature in SS scenarios

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Fig. 7

Temperature contour ( °C) for the scenario of SS-2

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Fig. 8

Velocity contour (m/s) for the scenario of SS-2

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Fig. 9

Inlet height impact to average temperature in WS scenarios

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Fig. 10

Temperature contour ( °C) for the case of WS-2

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Fig. 11

Velocity contour (m/s) for the case of WS-2

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Fig. 12

Average temperature results of the three series under SS-1 conditions

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Fig. 13

Average temperature results of the three series under WS-1 conditions

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Fig. 14

Heat transfer in the solar chimney

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Fig. 15

Flowchart of soil temperature calculation

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Fig. 16

Hourly soil surface temperature results in the solar chimney

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Fig. 17

Supplementary heat for 10  °C soil surface temperature requirement



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