Numerical performance modelling of solar chimney power plants: Influence of chimney height for a pilot plant in Manzanares, Spain

2020 ◽  
Vol 39 ◽  
pp. 100704 ◽  
Author(s):  
Erdem Cuce ◽  
Harun Sen ◽  
Pinar Mert Cuce
Keyword(s):  
Pilot Plant ◽  
Power Plants ◽  
Solar Chimney ◽  
Performance Modelling ◽  
Numerical Performance

scholarly journals Impacts of Ground Slope on Main Performance Figures of Solar Chimney Power Plants: A Comprehensive CFD Research with Experimental Validation

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Erdem Cuce ◽  
Pinar Mert Cuce ◽  
Harun Sen ◽  
K. Sudhakar ◽  
Umberto Berardi ◽  
...  
Keyword(s):  
Power Output ◽  
Pilot Plant ◽  
Power Plants ◽  
Electrical Power ◽  
Maximum Velocity ◽  
Discrete Ordinates ◽  
Solar Chimney ◽  
Reference Case ◽  
Sloping Ground ◽  
Ground Slope

Geometric parameters in solar chimney power plants are numerically optimised for the purpose of better power output figures. Several parameters have been investigated in the pilot plant such as chimney height and diameter, collector diameter and slope, and slenderness. However, ground slope has not been studied to date despite its perspicuous impact on turbulent flow. In this study, the impacts of the different slope angles of the ground, where the solar radiation is absorbed through the collector, on the main performance parameters of the system are numerically analysed through a reliable CFD software ANSYS FLUENT. By considering the actual geometric figures of the pilot plant, a 3D model is constructed through DO (discrete ordinates) solar ray tracing algorithm and RNG k-ε turbulence model. For the solar intensity of 1000 W/m2, the maximum velocity inside the system is found to be 14.2 m/s, which is in good accordance with the experimental data of 15.0 m/s. Starting from 5 m inside the collector, the chimney inlet heights are reconfigured 0.209, 0.419, 0.625, 0.838, and 1.04 m, respectively, and when the ground slope is 0.1, 0.2, 0.3, 0.4, and 0.5°, the changes in the performance output of the system are investigated. For the reference case which refers to the horizontal ground, the maximum air velocity is determined to be 14.2 m/s and the power output is 54.3 kW. However, when the ground slope is made 0.5°, it is observed that the maximum velocity increases by 37% to 19.51 m/s, and the power output is enhanced to 63.95 kW with a rise of 17.7%. Sloping ground is found a key solution to improve the turbulent effects inside the plant, thus to enhance the electrical power output.

scholarly journals Radial Turbine Design for Solar Chimney Power Plants

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 674
Author(s):  
Paul Caicedo ◽  
David Wood ◽  
Craig Johansen
Keyword(s):  
Power Plants ◽  
Reference Frames ◽  
Three Dimensional ◽  
Discrete Ordinates ◽  
Large Area ◽  
Solar Chimney ◽  
Cfd Simulations ◽  
Radial Turbine ◽  
Design Changes ◽  
Turbine Design

Solar chimney power plants (SCPPs) collect air heated over a large area on the ground and exhaust it through a turbine or turbines located near the base of a tall chimney to produce renewable electricity. SCPP design in practice is likely to be specific to the site and of variable size, both of which require a purpose-built turbine. If SCPP turbines cannot be mass produced, unlike wind turbines, for example, they should be as cheap as possible to manufacture as their design changes. It is argued that a radial inflow turbine with blades made from metal sheets, or similar material, is likely to achieve this objective. This turbine type has not previously been considered for SCPPs. This article presents the design of a radial turbine to be placed hypothetically at the bottom of the Manzanares SCPP, the only large prototype to be built. Three-dimensional computational fluid dynamics (CFD) simulations were used to assess the turbine’s performance when installed in the SCPP. Multiple reference frames with the renormalization group k-ε turbulence model, and a discrete ordinates non-gray radiation model were used in the CFD simulations. Three radial turbines were designed and simulated. The largest power output was 77.7 kW at a shaft speed of 15 rpm for a solar radiation of 850 W/m2 which exceeds by more than 40 kW the original axial turbine used in Manzanares. Further, the efficiency of this turbine matches the highest efficiency of competing turbine designs in the literature.

Economic Assessment of Concrete and Floating Based Solar Chimney Power Plants in Bangladesh

2020 ◽  
Author(s):  
Md. Abdul Aziz Bhuiyan ◽  
Md Abdul Aziz Bhuiyan ◽  
Mehedi Hasan Bhuiyan ◽  
Mehedi Hasan Bhuiyan ◽  
Md Ashiqur Rahman ◽  
...  
Keyword(s):  
Power Plants ◽  
Economic Assessment ◽  
Solar Chimney

Constructal Distribution of Solar Chimney Power Plants: Few Large and Many Small

2010 ◽  
Vol 7 (6) ◽  
pp. 577-592 ◽  
Author(s):  
S. Lorente ◽  
A. Koonsrisuk ◽  
A. Bejan
Keyword(s):  
Power Plants ◽  
Solar Chimney

scholarly journals Enclosed Solar Chimney Power Plants with Thermal Storage

OALib ◽  
2016 ◽  
Vol 03 (05) ◽  
pp. 1-18
Author(s):  
Christos D. Papageorgiou
Keyword(s):  
Power Plants ◽  
Thermal Storage ◽  
Solar Chimney

Solar chimney power plants for high latitudes

Solar Energy ◽  
2005 ◽  
Vol 79 (5) ◽  
pp. 449-458 ◽  
Author(s):  
E. Bilgen ◽  
J. Rheault
Keyword(s):  
Power Plants ◽  
High Latitudes ◽  
Solar Chimney

Counter-rotating turbines for solar chimney power plants

2006 ◽  
Vol 31 (12) ◽  
pp. 1873-1891 ◽  
Author(s):  
F. Denantes ◽  
E. Bilgen
Keyword(s):  
Power Plants ◽  
Solar Chimney

Solar Chimney Power Plant Performance for Different Seasons Under Varying Solar Irradiance and Temperature Distribution

2020 ◽  
Vol 143 (6) ◽  
Author(s):  
Ulku Ece Ayli ◽  
Ekin Özgirgin ◽  
Maısarh Tareq
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Ambient Temperature ◽  
Solar Irradiance ◽  
Power Plants ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Three Dimensional ◽  
Plant Performance ◽  
Solar Chimney

Abstract One of the most promising renewable energy sources is solar energy due to low cost and low harmful emissions, and from the 1980s, one of the most beneficial applications of solar energy is the utilization of solar chimney power plants (SCPP). Recently, with the advancement in computer technology, the use of computational fluid dynamics (CFD) methodology for studying SCPP has become an extensive, robust, and powerful technique. In light of the above, in this study, numerical simulations of an SCPP through three-dimensional axisymmetric modeling is performed. A numerical model is created using CFD software, and the results are verified with an experimental study from the literature. The amount of solar radiation and surrounding weather (ambient temperature) were analyzed, and the effects of the irradiance and air temperature on the output power of the SCPP were studied. Ambient temperature is considered as one of the most important factors that influence collector efficiency in a negative or a positive manner. Solar irradiance is considered to be the most important factor that has an impact on SCPP performance. The investigation includes the study of the relationship between solar insolation and ambient temperatures during the daytime since the difference between the minimum and maximum power values and the performance are very important considering seasonal changes. According to the results, power values are dependent on the amount of solar radiation as well as the ambient temperature, and the importance of selection of location thus climate for an SCPP is found to affect the design of the SCPP.

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