Comparative Energetic and Exergetic Analysis of Conventional and Sloped Solar Chimney Power Plants

2020 ◽  
Vol 9 (4) ◽  
pp. 57-73
Author(s):  
Hela Atia ◽  
Adrian Ilinca ◽  
Ali Snoussi ◽  
Rachid Boukchina ◽  
Ammar Ben Brahim
Keyword(s):  
Inclination Angle ◽  
Power Plants ◽  
Energetic Efficiency ◽  
Cfd Analysis ◽  
Exergy Destruction ◽  
Solar Chimney ◽  
Ansys Fluent ◽  
Solar Radiation Intensity ◽  
Fluent Software ◽  
Exergetic Analysis

A CFD analysis using ANSYS Fluent software was conducted to study the effects of collector slope on solar chimney's performances. Three solar chimney configurations, named A, B, and C, which correspond, respectively, to an inclination angle of the collector roof of 0°, 2.5°, and 5°, were investigated. The results show that the thermodynamic performances of the solar chimney were improved by increasing the inclination angle of the collector roof. In fact, the power extracted from the sloped solar chimney power plants increases with increasing the inclination angle and the solar radiation intensity, while it achieves a maximum at 800 W/m2 for configuration A. The energetic and the exergetic analysis show that configure B has the best performance in terms of conventional, effective, and total efficiencies of the collector and in terms of exergy destruction ratios in both the collector and the transition section. Whereas, configuration C has the highest amount of power extracted and the best overall energetic efficiency.

scholarly journals The effect of using ribbed absorber plates on enhancing the heat transfer of solar chimneys

2021 ◽  
Vol 23 (07) ◽  
pp. 1431-1444
Author(s):  
Mohammed N. Jihad ◽  
◽  
Nabil J. Yasin ◽  
Kadhum A. Jehhef ◽  
◽  
...  
Keyword(s):  
Inclination Angle ◽  
Air Gap ◽  
Test Model ◽  
Solar Chimney ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Solar Radiation Intensity ◽  
Test Models ◽  
Inclination Angles ◽  
Gap Width

Under different geometrical features and in Iraqi environmental circumstances, a numerical and experimental investigation of a solar chimney was carried out the study that dealt with an important aspect, which is to increase the surface area of the absorbent plate while maintaining the outer dimensions and limits by using three model of absorber surface (flat plate, Triangular Vgrooved corrugated plate and trapezoidal corrugated absorber plate). the work was carried out using a single vertical solar chimney of a single room has a volume 27m3 modeling 1m3 placed on the southern wall of wooden chamber having a size of (1 × 1 ×1) m and absorber plate (0.9×0.99) m. In addition to studying the effect of the air gap width (0.1, 0.2) m on the test model with all absorber plate are used at different inclination angles inward (0°,5°,10° and 15°) the test model. All variable was taken with varying solar radiation intensity (150,250,350,450,550 and 700) W/m2 along the day time. Numerical simulation of the test models using the Ansys Fluent program V18.1 to solve the governing continuity, momentum and energy equations with a standard (k-ε)standard turbulence model associated with laws of the wall along solid boundaries were solved numerically, Experimental and Theoretical results of the present study show that the optimum model of the test absorber plates with air gap width and inclination angle according to Air change per hour (ACH) calculation is Triangular V-grooved absorber plate with air gap width 0.2m and inclination angle 10°. For this inclination angle and air gap width at I700 W/m2 the ACH is about 10 % higher than model1 (flat absorber plate) and more than model3(trapezoidal plate) by 17%.

scholarly journals CFD analysis for solar chimney power plants

Solar Energy ◽  
2013 ◽  
Vol 98 ◽  
pp. 12-22 ◽  
Author(s):  
Hermann F. Fasel ◽  
Fanlong Meng ◽  
Ehsan Shams ◽  
Andreas Gross
Keyword(s):  
Power Plants ◽  
Cfd Analysis ◽  
Solar Chimney

scholarly journals CFD analysis of the Ferrari 348 GTC intake system

2019 ◽  
Vol 24 (6) ◽  
pp. 128-133
Author(s):  
Monika Andrych-Zalewska ◽  
Łukasz Wielki ◽  
Krzysztof Ziora
Keyword(s):  
Static Pressure ◽  
Cfd Analysis ◽  
Ansys Fluent ◽  
Intake System ◽  
Static Pressure Distribution ◽  
Flow Disturbances ◽  
Computational Fluid Dynamics Analysis ◽  
Angular Velocities ◽  
Fluent Software ◽  
Flow Directions

The article presents CFD (Computational Fluid Dynamics) analysis of the intake system of a Ferrari 348 GTC sports car. With this system, an adequate amount of air is supplied relative to the current demand for fuel combustion. The air demand of a given engine was deter-mined, then analyzes were carried out. The article contains an analysis of the velocity distribution: total velocities, angular velocities and static pressure distribution. In addition, local velocity and flow in the filtration chamber were determined along with the flow directions and returns as well as power lines. The cycle impact on the temperature, locations of the highest speed drop, increase in turbulence, the largest pressure differences, and modulus of elasticity were determined. This information allows to assess whether there are no unwanted phenomena occurring in the system, such as flow disturbances. The Ansys Fluent software was used for analysis.

scholarly journals A performance analysis of solar chimney thermal power systems

2011 ◽  
Vol 15 (3) ◽  
pp. 619-642 ◽  
Author(s):  
Awwad Al-Dabbas
Keyword(s):  
Mathematical Model ◽  
Power Systems ◽  
Power Plants ◽  
Thermal Power ◽  
System Size ◽  
Solar Thermal ◽  
Solar Chimney ◽  
Specific System ◽  
Solar Thermal Power ◽  
Solar Radiation Intensity

The objective of this study was to evaluate the solar chimney performance theoretically (techno-economic). A mathematical model was developed to estimate the following parameter: Power output, Pressure drop across the turbine, the max chimney height, Airflow temperature, and the overall efficiency of solar chimney. The mathematical model was validated with experimental data from the prototype in Manzanares power. It can be concluded that the differential pressure of collector-chimney transition section in the system, is increase with the increase of solar radiation intensity. The specific system costs are between 2000 Eur/kW and 5000 Eur/kW depending on the system size, system concept and storage size. Hence, a 50 MWe solar thermal power plant will cost 100-250 Eur million. At very good sites, today?s solar thermal power plants can generate electricity in the range of 0.15 Eur/kWh, and series production could soon bring down these costs below 0.10 Eur /kWh.

scholarly journals CFD Analysis of Hybrid Solar Chimney Power Plant

2018 ◽  
Vol 225 ◽  
pp. 04011
Author(s):  
Mohammed A. Aurybi ◽  
Hussain H. Al-Kayiem ◽  
Syed I.U. Gilani ◽  
Ali A. Ismaeel
Keyword(s):  
Flue Gas ◽  
Navier Stokes ◽  
Discrete Ordinates ◽  
Hybrid Mode ◽  
Solar Chimney ◽  
Ansys Fluent ◽  
Novel Approach ◽  
Fluent Software ◽  
Solar Chimney Power Plant ◽  
Energy Equations

In this study, a novel approach has been proposed as a solar chimney integrated with an external heat source to extend the system operation during the absence of solar energy. Flue gas channels have been utilized to exchange heat with the air inside the collector of the solar chimney. The hybrid solar chimney has been investigated numerically by ANSYS-Fluent software, using discrete ordinates radiation model. The hybrid system was simulated in 3D, steady-state by solving Navier-Stokes and energy equations. The numerical results have been validated using experimental measurements of a conventional solar chimney. The influence of flue channels on the system performance was predicted and analyzed in hybrid mode. With 0.002 kg/s of flue gas at 100°C injected in flue channels during the daytime; hybrid mode results demonstrated enhancement of 24% and 9 % for velocity and temperature, respectively. The power generation was enhanced by 56%. It has been proved that the proposed technique is able to resolve the set back of night operation problem of the solar chimney plants.

scholarly journals Aerodynamics Analysis and Range Enhancement Study of 81mm Mortar Shell (French Design)

2021 ◽  
Vol 84 (1) ◽  
pp. 148-159
Author(s):  
Roman Kalvin ◽  
Juntakan Taweekun ◽  
Muhammad Waqas Mustafa ◽  
Saba Arif
Keyword(s):  
Drag Coefficient ◽  
Parabolic Type ◽  
Cfd Analysis ◽  
Ansys Fluent ◽  
Flight Duration ◽  
Percent Increase ◽  
Fluent Software ◽  
Computational Fluid Dynamics Cfd ◽  
French Design ◽  
Coefficient Reduction

The aim of this research is performing the Computational Fluid Dynamics (CFD) analysis of 81mm Mortar Shell (French Design). The analysis is performed using ANSYS Fluent Software on three different Mach numbers (0.72, 0.76, and 0.84) and results are compared with existing design of 81mm HE M57D A2 Mortar. The drag coefficient of new modified design is found to be less than the existing model. The range of mortar shell is increased by 271 meters because of low drag coefficient with 5.96% percent increase in range and 15.73% decrease in drag coefficient value. Parabolic type; light weighted material fuze casing applied over the existing fuze will result in increase in aerodynamics, range enhancement and drag coefficient reduction. Weight optimization by using lighter material for mortar components and increasing the muzzle velocity can also increase flight duration of the projectile and increase its range. The analysis on 81mm Mortar Shell is a part of range enhancement study to overcome the short fall in required range of mortar shells.

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.

Influence of Some Parameters on Thermo-Hydrodynamic Fluid Flow Behaviour of Solar Chimney Power Plants

2016 ◽  
Vol 819 ◽  
pp. 78-82
Author(s):  
Toufik Chergui ◽  
Salah Larbi ◽  
Amor Bouhdjar
Keyword(s):  
Power Plants ◽  
Air Flow ◽  
Computer Software ◽  
Physical Parameters ◽  
Solar Chimney ◽  
Solar Radiation Intensity ◽  
Solar Chimney Power Plant ◽  
Air Flow Velocity ◽  
Volume Method ◽  
Modelling Approach

The purpose of this study is related to a numerical simulation of flows in a solar chimney. The mathematical modelling approach used is based on flows in an opened enclosure with two components: a cylinder and a disc. This analysis consists in developing a computer software with dimensionless variables, and in generalized coordinates, in order to simulate an air flow in a chimney, by taking into account different flow regimes. Thermo-hydrodynamic aspect of flows is also analysed by solving the governing equations numerically using the finite volume method with adequate boundary conditions. The results presented are related to air flow velocity and temperature distributions versus Rayleigh number and some geometrical and physical parameters, such as the height of the chimney and the solar radiation intensity. The approach undertaken in this paper is related mainly in analyzing a solar chimney power plant to produce a power of a few MW.

scholarly journals CFD analysis on the influence of angle of attack on vertical axis wind turbine aerodynamics

2021 ◽  
Vol 850 (1) ◽  
pp. 012027
Author(s):  
Prateek Srivastava ◽  
Sachin Kansal ◽  
Ashish Talwalkar ◽  
R Harish
Keyword(s):  
Wind Turbine ◽  
Angle Of Attack ◽  
Vertical Axis ◽  
Cfd Analysis ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
Ansys Fluent ◽  
Wind Turbine Aerodynamics ◽  
Fluent Software ◽  
Overall Performance

Abstract The Angle of Attack (AOA) in a Vertical Axis Wind Turbine (VAWT) plays an important role in determining the forces and the power generated by the wind turbine. It is difficult to find the suitable AOA due to the complex and constantly changing wind flow patterns. In this paper, we have performed CFD simulations using Ansys Fluent software, based on the constantly changing AOA. The CFD simulations were conducted by selecting a suitable range of AOA and the velocity of the wind. The selected range of AOA varied from 5 degrees to 25 degrees with increments of 5 degrees and the range of the air velocities varied from 7m/s to 21m/s with increments of 7m/s. The tests were also performed using the X-Foil software. The results obtained from the CFD simulations, done by using the Ansys Fluent Software and from the X-Foil software, were then compared to give a more accurate and optimized AOA and velocity value. This optimization of the AOA could enhance the overall performance of the Vertical Axis Wind turbine.

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