The while varying the collector roof angle. The authors

The solar chimney power plant (SCPP) are designed to
generate electricity from the solar radiation. A solar chimney power plant is
equipped generally by one or many turbines which are designed
to extract the kinetic
energy of the wind flowing upward due to the natural convection. Then, the
generator, which is coupled with the turbine, converts the
wind’s kinetic energy into electrical power. Several researchers
reported that the use of the solar chimney power plant is an encouraging
solution to produce electrical energy. The optimization of the solar setup
requires the study of the geometrical parameters such as the collector
diameter, the collector roof height 1, the chimney height 2, the chimney diameter, the
inclination of the roof 3 and the design of the turbine. The first prototype of the SCPP was built in
Manzanares. The prototype is characterized by a height equals to 194.6 m and a
collector radius equals to 122 m. In this context, Haaf et al. 4-5 developed
the results of preliminary tests of the SCPP. They presented the energy audits,
the collector efficiency values, the pressure losses due to friction and losses
in the turbine section. Ayadi et al. 3 developed a numerical model to evaluate the
performance of the solar chimney power systems while varying the collector roof
angle. The authors reported that the efficiency of the solar chimney power plant increases with a
negative angle of the collector roof. Xu et al. 6 analyzed numerically the influences of the solar radiation
and the pressure drop across the turbine on the power output of the solar
chimney power plant. From the literature, researchers have reported
some configurations of the turbine layouts such as the single rotor turbine
without inlet guide vanes (IGV), single rotor turbine with IGVs, counter
rotating turbine without IGVs and the counter rotating turbine with IGVs. The
turbo-generator of the Manzanares prototype was designed by Schwarz and Knauss
7. The authors proposed a single rotor layout without guide vanes. Later,
Gannon and Von Backström 8 carried out an experimental analysis of the solar
chimney turbine performance. It was reported by the authors that the
total-to-total efficiency and the total-to-static efficiency are equal
respectively to 85-90% and 77-80% over the concept range. Another work was
presented by the same authors 9 to develop analytical equations to defining
the impact of each coefficient on the efficiency on the turbine. Recently, Ming
et al. 10 carried out a numerical simulation for a solar chimney power plant
coupled with a five-blade turbine. The considered system is characterized by
the chimney height equal to 400 m, the chimney radius equal to 30 m and the
collector radius equal to 1500 m. The authors presented the impact of the rotational
speed of the turbine on the average velocity of the chimney outlet, the average
temperature of the chimney outlet, the pressure drop across the turbine and the
mass flow rate of the system. The maximum generated power and the turbine
efficiency are about 10 MW and 50%, respectively. Guo et al. 11 presented a 3D numerical simulation of a solar chimney
coupling with a turbine. In their work, they have varied the rotational speed
of the turbine to study the optimal operating condition of the turbine. In
their study, they have taken account the influences of the incident angle of
the sunlight. Results revealed that the hourly variation of the zenith angle of
the sun is an important parameter to predict the annual performance of the
SCPP.

Focusing on the
literature, it has been noted that the most published papers highlight the
effect of the geometrical parameters of the solar setup such as the collector
roof height, the collector diameter, the chimney height and the chimney
diameter. In this paper, we are going to focus on the study of the turbine.
Especially, the effect of the turbine diameter on the flow characteristics
inside a solar chimney power plant is reported. This paper is identified as
important to engineers in supplying them technical solutions to enhance the
ventilation within a solar chimney power plant. 
 

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