Technical Brief

Pressure Losses in Solar Chimney Power Plant

[+] Author and Article Information
Xinping Zhou

Department of Mechanics,
Huazhong University of Science and Technology,
Wuhan 430074, China
e-mail: xpzhou08@hust.edu.cn

Yangyang Xu

Department of Mechanics,
Huazhong University of Science and Technology,
Wuhan 430074, China

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 August 5, 2017; final manuscript received December 31, 2017; published online January 31, 2018. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 140(2), 024502 (Jan 31, 2018) (7 pages) Paper No: SOL-17-1328; doi: 10.1115/1.4038962 History: Received August 05, 2017; Revised December 31, 2017

This technical brief develops a theoretical model of all the pressure losses in the solar chimney power plant (SCPP, also called solar updraft power plant) and analyzes the pressure losses for different chimney internal stiffening appurtenance (SA) structures, different roof heights, and different collector support parameters. Results show that the exit dynamic pressure drop (EDPD) accounts for the majority of the total pressure loss (TPL), while other losses constitute only small proportions of the TPL, and the collector inlet loss is negligible. Pressure losses are strongly related to the mass flow rate, while reasonable mass flow rates excluding too low flow rates have little influence on the pressure loss ratios (PLRs, defined as the ratios of the pressure losses to the TPL) and the total effective pressure loss coefficient (TEPLC). Designing of the SA structure in view of reducing the drag, for example, using the ring stiffeners without wire spoked instead of the spoked bracing wheels (SBWs), reducing the width of the chimney internal rims of SAs, or reducing the number of SAs results in large reduction of the SA PLR and the TPL. Lower roof leading to higher velocity inside the collector, larger supports, or shorter intersupport distance leads to the increase in the support PLR. This technical brief lays a solid foundation for optimization of SCPPs in future.

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Grahic Jump Location
Fig. 1

Schematic of a conventional SCPP and its reference typical positions labeled

Grahic Jump Location
Fig. 2

Various pressure losses, PLRs, and TEPLC for KSA = 0.01 versus mass flow rate: (a) pressure losses and (b) TEPLC and PLRs

Grahic Jump Location
Fig. 3

Various pressure losses for KSA = 0.0897 versus mass flow rate

Grahic Jump Location
Fig. 4

TPLs and SA pressure losses for the number (n) of SAs of 5, 10, 15, and 20 versus mass flow rate

Grahic Jump Location
Fig. 5

TPLs and support pressure losses for collector entrance roof heights (RHs) of 2 m, 4 m, 6 m, and 8 m versus mass flow rate

Grahic Jump Location
Fig. 6

TPLs and support pressure losses for intersupport distances (IDs) of 5 m, 10 m, and 15 m versus mass flow rate

Grahic Jump Location
Fig. 7

TPLs and support pressure losses for support diameters (SDs) of 0.1 m, 0.2 m, 0.3 m, and 0.4 m versus mass flow rate




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