A computational and an experimental study on the effect of the chimney height on the thermal characteristics of a solar chimney power plant

2017 ◽  
Vol 232 (4) ◽  
pp. 503-516 ◽  
Author(s):  
Ahmed Ayadi ◽  
Zied Driss ◽  
Abdallah Bouabidi ◽  
Haithem Nasraoui ◽  
Moubarek bsisa ◽  
...  
Keyword(s):  
Power Plant ◽  
Air Flow ◽  
Thermal Characteristics ◽  
Solar Chimney ◽  
Ansys Fluent ◽  
Local Characteristics ◽  
The North ◽  
National School ◽  
Solar Chimney Power Plant ◽  
The Impact

The aim of this paper is to highlight the impact of the chimney height on the local characteristics of the air flow within a solar chimney power plant. The solar chimney power plant prototype was numerically and experimentally investigated. The experimental prototype of the solar chimney power plant was built in the National School of Engineers of Sfax, University of Sfax, Tunisia in the North Africa. The prototype is characterized by a collector diameter equal to D = 2750 mm, a collector height equal to h = 50 mm, a chimney height equal to H = 3000 mm, and a chimney diameter equal to d = 160 mm. The air flow has been simulated using the commercial software Ansys Fluent 17.0 and the computational findings have been validated using our experimental results. Computational fluid dynamics findings confirm that the chimney height is very influential on the local characteristics of the solar chimney power plant.

Effect of the number of turbine blades on the air flow within a solar chimney power plant

2017 ◽  
Vol 232 (4) ◽  
pp. 425-436 ◽  
Author(s):  
Ahmed Ayadi ◽  
Zied Driss ◽  
Abdallah Bouabidi ◽  
Mohamed Salah Abid
Keyword(s):  
Power Plant ◽  
Kinetic Energy ◽  
Power Plants ◽  
Turbulent Viscosity ◽  
Air Flow ◽  
Turbine Blades ◽  
Electrical Power ◽  
Thermal Characteristics ◽  
Solar Chimney ◽  
Solar Chimney Power Plant

Solar chimney power plants generate thermal heat and electrical power using the radiation from sun. These systems are characterized by their high costs. In fact, it is required to optimize the components of the solar system such as the collector, the chimney, the absorber, and the turbine. This paper focuses on the effect of the number of turbine blades on the air flow within a small prototype of a solar chimney power plant. Four configurations with different turbine blades are proposed to study the effect of the turbine blades number on the thermal characteristics of a solar chimney power plant. For each configuration, the distribution of the magnitude velocity, the air temperature, the pressure, the turbulent kinetic energy, and the turbulent viscosity are presented and discussed. This paper is identified to be of interest for engineers and designers for increasing the power output of a solar chimney power plant.

Numerical and experimental study of the impact of conical chimney angle on the thermodynamic characteristics of a solar chimney power plant

2019 ◽  
Vol 233 (5) ◽  
pp. 1185-1199 ◽  
Author(s):  
Haythem Nasraoui ◽  
Zied Driss ◽  
Ahmed Ayadi ◽  
Abdallah Bouabidi ◽  
Hedi Kchaou
Keyword(s):  
Power Plant ◽  
Power Output ◽  
Thermodynamic Characteristics ◽  
Solar Chimney ◽  
Efficient System ◽  
Conical Angle ◽  
Mathematical Correlation ◽  
Typical Day ◽  
Solar Chimney Power Plant ◽  
The Impact

The goal of this paper is to study and optimize the conical chimney angle (α) of a divergent solar chimney power plant (DSCPP) by using CFD technique. The local airflow characteristics were analyzed in four configurations with different conical angles α = 0°, α = 3°, α = 6° and α = 9°. The first design is validated experimentally by using a pilot prototype build at the National School of Engineers of Sfax, Tunisia. In addition, some experimental results of the temperature, the velocity and the power output were presented during a typical day. A novel mathematical correlation was developed to prove the effect of the conical angle and the DSCPP scale on the power output. In fact, the relationship between the optimum conical angle and the system scale was performed based on both quadratic and cubic regressions. The computational results ensure that the conical chimney angle presents a parabolic tendency with the turbulence airflow characteristics and the power output. The performance of the DSCCP was degraded since the conical angle is greater than α = 3°. Furthermore, the optimum angle decreases with an increasing system scale. A commercial solar chimney with a conical angle around α = 1° presents an efficient system.

scholarly journals Simulation and Experimental Study of the Influence of the Baffles on Solar Chimney Power Plant System

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 902
Author(s):  
Haixia Wang ◽  
Jusheng Chen ◽  
Ping Dai ◽  
Fujiang Zhang ◽  
Qingling Li
Keyword(s):  
Power Plant ◽  
3D Models ◽  
Temperature Fields ◽  
Solar Chimney ◽  
Ansys Fluent ◽  
Plant System ◽  
Type D ◽  
Experimental Apparatus ◽  
Solar Chimney Power Plant ◽  
Power Outputs

The solar chimney power plant system (abbreviated as SCPPS) is a clean and pollution-free facility for generating electric power. To improve the generating efficiency, a bank of baffles can be arranged under the collector in SCPPS. ANSYS Fluent 18.2 was used to numerically simulate 3D models of SCPPS with or without baffles, and an experimental apparatus was built for verification. There are seven different types of model discussed here: the SCPPS without baffles (prototype), and other six types of models with different baffles (a-type, b-type, c-type, d-type, e-type, and f-type). The pressure fields, temperature fields, velocity fields, and power outputs of different models under the different baffles are discussed. It is shown that the addition of baffles in the system can increase the temperature field, pressure field, velocity field, and power output to varying degrees, but b-type baffles better improve the temperature and velocity uniformity of the system, and intensify the output power. For b-type, the simulation of the systems with five different baffle numbers (3, 4, 6, 8, and 12, respectively) was carried out, and it was concluded that the system with 12 baffles is the best in improving the system performance. It can be seen that the more the number of baffles, the better the performance of SCPPS. The experiments are also verified the simulation.

scholarly journals Experimental and Numerical Study of Collector Geometry Effect on Solar Chimney Performance

2017 ◽  
Vol 12 (4) ◽  
pp. 59-71
Author(s):  
Aseel K. Shyaa ◽  
Rafea A. H. Albaldawi ◽  
Maryam Muayad Abbood
Keyword(s):  
Power Plant ◽  
Numerical Study ◽  
Governing Equations ◽  
Solar Chimney ◽  
Ansys Fluent ◽  
Glass Cover ◽  
Pilot Work ◽  
Fluent Software ◽  
Design Velocity ◽  
Solar Chimney Power Plant

There have been many advances in the solar chimney power plant  since 1930 and the first pilot work was built in Spain (Manzanares) that produced 50 KW. The solar chimney power plant is considered of a clean power generation that needs to be investigated  to enhance the performance by studying the effect of changing the area of passage of air to enhance the velocity towards the chimney to maximize design velocity. In this experimental and numerical study, the reduction area of solar collector was investigated. The reduction area that mean changing the height of glass cover from the absorbing plate (h1=3.8cm, h2=2.6cm and h3=1.28cm). The numerical study was performed using ANSYS Fluent software package (version 14.0) to solve governing equations. The aim of this work was to study the effect of change the height of reduction area to the design velocity (velocity move the blade of turbine at inlet in the chimney). The results showed that the third height (h3=1.28cm) gives the best result because when decreasing the height between the glass cover and absorbing plate, the area between them decreased and the design velocity increased then the efficiency of solar chimney model was increased.

scholarly journals Study the Possibility of Implementing a Solar Chimney Power Plant in Algeria (Case study: Constantine)

2021 ◽  
Vol 19 ◽  
pp. 103-108
Author(s):  
S. Djimli ◽  
◽  
A. Chaker ◽  
T.E. Boukelia ◽  
A. Ghellab ◽  
...  
Keyword(s):  
Power Plant ◽  
Rural Areas ◽  
Energy Production ◽  
Electrical Energy ◽  
Solar Irradiation ◽  
Solar Chimney ◽  
Fluent Software ◽  
Solar Chimney Power Plant ◽  
The Impact

This work offers the opportunity to consider the possibility of realizing a solar chimney power plant in the region of Constantine (Algeria). This region is characterized by its important solar radiation resource and ambient temperature. Based on actual measurements of Constantine weather station for the period of April 2020, the performance analysis of a solar chimney which have three times the dimensions of the Manzaneres prototype (Spain) is carried out using of Fluent software. The obtained results show that when the dimensions of the solar chimney are large, the impact of small changes in solar irradiation is negligible. Also, the studied power plant with dimensions of; 584 m height, a diameter of 30 m and a collector diameter of 732 m is capable of producing a monthly average of 72 to 296 MW of electrical energy, this energy production would be sufficient to meet the needs of rural areas located in this region.

Performance analysis of a solar chimney power plant system in two Algeria regions

2021 ◽  
pp. 1-26
Author(s):  
Sellami Ali ◽  
Benlahcene Djaouida ◽  
Abdelmoumène Hakim Benmachiche ◽  
Zeroual Aouachria
Keyword(s):  
Power Plant ◽  
Performance Analysis ◽  
Solar Chimney ◽  
Plant System ◽  
Solar Chimney Power Plant
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