Effects of flow area changes on the potential of solar chimney power plants

Koonsrisuk, Atit; Chitsomboon, Tawit

doi:10.1016/j.energy.2012.12.051

Cited by 90 publications

(32 citation statements)

References 13 publications

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“…The numerical and mathematical simulations showed a good agreement on the tendency of the system power output over the varying ARs: the power output increased with increasing AR until the AR was around 8 to 10 and then degraded remarkably. This parabolic tendency over the ARs was also observed in other studies [6,7]. The degradation of the performance should be related to the formation of the diffuser stall that generates small eddies near the chimney wall and thus results in a separation of the flow from the chimney surface and an increase of pressure drop [10,12].…”

Section: Validity Of the Mathematical Modelsupporting

confidence: 62%

“…1). Besides, a remarkable improvement on the power output of the SCPPs with divergent chimneys was reported in several publications [5][6][7][8]. Interestingly, there is a large deviation in the performance of the divergent SCPPs in different studies: after normalizing the power output of the divergent SCPPs with that of the equal-size cylindrical SCPPs, the dimensionless output varied from 0.7 to 160 [5][6][7][8].…”

Section: Introductionmentioning

confidence: 86%

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Mathematical Modelling of the Performance of a Solar Chimney Power Plant with Divergent Chimneys

Leung

2017

Energy Procedia

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Chimney is a critical component influencing the performance of a Solar Chimney Power Plant (SCPP). An enhancement on the power output of SCPPs with divergent chimneys was observed in a number of experimental and numerical studies using Computational Fluid Dynamic (CFD) models. In this paper, a mathematical model was established to analyse the hydrodynamic features of a series of divergent chimneys in a SCPP. The importance of estimating the loss from the potential diffuser stall in divergent chimneys was especially discussed in this study. The result of the mathematical model was compared with those of CFD simulation to evaluate the validity and the performance of this present model. Subsequently, parametric studies were conducted by using this mathematical model. The performance of divergent SCPPs was found to be governed by the area ratio of chimney entrance over its exit. The result further indicated that the optimal area ratio of divergent chimneys was different when the chimney height varied from 100m to 300m. Besides, several shorter divergent SCPPs showed a comparable power output as the cylindrical SCPPs with taller chimneys, which demonstrated an outstanding advantage of divergent SCPPs for commercial application.

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Section: Validity Of the Mathematical Modelsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 86%

Mathematical Modelling of the Performance of a Solar Chimney Power Plant with Divergent Chimneys

Leung

2017

Energy Procedia

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“…Fundamental experiments on how much power is generated, depending on size of the basic component of the solar tower, have not been fully performed (power generation expectation and optimization study [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]). Few reports have discussed the tower shape regarding a diffuser type [13,14] and hardly any research has discussed the effect of crosswind around a solar chimney [17,18,25].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Experiment and Numerical Analysis of a New Type of Solar Tower Efficiently Generating a Thermal Updraft

et al. 2016

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Abstract:A new type of solar tower was developed through laboratory experiments and numerical analyses. The solar tower mainly consists of three components. The transparent collector area is an aboveground glass roof, with increasing height toward the center. Attached to the center of the inside of the collector is a vertical tower within which a wind turbine is mounted at the lower entry to the tower. When solar radiation heats the ground through the glass roof, ascending warm air is guided to the center and into the tower. A solar tower that can generate electricity using a simple structure that enables easy and less costly maintenance has considerable advantages. However, conversion efficiency from sunshine energy to mechanical turbine energy is very low. Aiming to improve this efficiency, the research project developed a diffuser-type tower instead of a cylindrical tower, and investigated a suitable diffuser shape for practical use. After changing the tower height and diffuser open angle, with a temperature difference between the ambient air aloft and within the collector, various diffuser tower shapes were tested by laboratory experiments and numerical analyses. As a result, it was found that a diffuser tower with a semi-open angle of 4 • is an optimal shape, producing the fastest updraft at each temperature difference in both the laboratory experiments and numerical analyses. The relationships between thermal updraft speed and temperature difference and/or tower height were confirmed. It was found that the thermal updraft velocity is proportional to the square root of the tower height and/or temperature difference.

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“…Koonsrisuk and Chitsomboon [121] worked on a theoretical model using CFD analysis to investigate the effects of flow area changes on the potential of SCPP. In this study, they examined the flow area changes in collector and chimney (Fig.…”

Section: Analytical and Simulation Studiesmentioning

confidence: 99%

A review on solar chimney systems

Kasaeian

Molana

Rahmani

et al. 2017

Renewable and Sustainable Energy Reviews

151

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The increased utilization of solar energy has gained the attention of researchers to develop the solar chimney (SC) technology in recent years. Many studies have been conducted in this aear both experimentally and theoretically, whereas experimental studies are mainly focused on small-scale systems. This work provides a comprehensive and updated review that include most of the experimental studies, analytical and simulation works, the solar chimney applications, hybrid systems and geographical case studies based on extended references, citation of the updated works and the specified way of looking at different sections. The technological gaps in differnet sections are identified and a summary of suggestions is given for the future work, including more experimental works on the large-scale systems, and CFD analyses for optimization between the geometrical parameters and the output power. More studies on new applications of solar chimney technology including hybrid systems are also recommended.

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Effects of flow area changes on the potential of solar chimney power plants

Cited by 90 publications

References 13 publications

Mathematical Modelling of the Performance of a Solar Chimney Power Plant with Divergent Chimneys

Mathematical Modelling of the Performance of a Solar Chimney Power Plant with Divergent Chimneys

Laboratory Experiment and Numerical Analysis of a New Type of Solar Tower Efficiently Generating a Thermal Updraft

A review on solar chimney systems

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