The by a height equals to 194.6

The solar chimney power plant (SCPP) are designed togenerate electricity from the solar radiation. A solar chimney power plant isequipped generally by one or many turbines which are designedto extract the kineticenergy of the wind flowing upward due to the natural convection.

Then, thegenerator, which is coupled with the turbine, converts thewind’s kinetic energy into electrical power. Several researchersreported that the use of the solar chimney power plant is an encouragingsolution to produce electrical energy. The optimization of the solar setuprequires the study of the geometrical parameters such as the collectordiameter, the collector roof height 1, the chimney height 2, the chimney diameter, theinclination of the roof 3 and the design of the turbine. The first prototype of the SCPP was built inManzanares. The prototype is characterized by a height equals to 194.

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6 m and acollector radius equals to 122 m. In this context, Haaf et al. 4-5 developedthe results of preliminary tests of the SCPP.

They presented the energy audits,the collector efficiency values, the pressure losses due to friction and lossesin the turbine section. Ayadi et al. 3 developed a numerical model to evaluate theperformance of the solar chimney power systems while varying the collector roofangle. The authors reported that the efficiency of the solar chimney power plant increases with anegative angle of the collector roof. Xu et al.

6 analyzed numerically the impacts of the solar radiationand the pressure drop across the turbine on the power output of the solarchimney power plant. From the literature, researchers have reportedsome configurations of the turbine layouts such as the single rotor turbinewithout inlet guide vanes (IGV), single rotor turbine with IGVs, counterrotating turbine without IGVs and the counter rotating turbine with IGVs. Theturbo-generator of the Manzanares prototype was designed by Schwarz and Knauss7. The authors proposed a single rotor layout without guide vanes. Later,Gannon and Von Backström 8 carried out an experimental analysis of the solarchimney turbine performance. It was reported by the authors that thetotal-to-total efficiency and the total-to-static efficiency are equalrespectively to 85-90% and 77-80% over the concept range.

Another work waspresented by the same authors 9 to develop analytical equations to definingthe impact of each coefficient on the efficiency on the turbine. Recently, Minget al. 10 carried out a numerical simulation for a solar chimney power plantcoupled with a five-blade turbine.

The considered system is characterized bythe chimney height equal to 400 m, the chimney radius equal to 30 m and thecollector radius equal to 1500 m. The authors presented the impact of the rotationalspeed of the turbine on the average velocity of the chimney outlet, the averagetemperature of the chimney outlet, the pressure drop across the turbine and themass flow rate of the system. The maximum generated power and the turbineefficiency are about 10 MW and 50%, respectively. Guo et al. 11 presented a 3D numerical simulation of a solar chimneycoupling with a turbine. In their work, they have varied the rotational speedof the turbine to study the optimal operating condition of the turbine. Intheir study, they have taken account the influences of the incident angle ofthe sunlight.

Results revealed that the hourly variation of the zenith angle ofthe sun is an important parameter to predict the annual performance of theSCPP. Focusing on theliterature, it has been noted that the most published papers highlight theeffect of the geometrical parameters of the solar setup such as the collectorroof height, the collector diameter, the chimney height and the chimneydiameter. In this paper, we are going to focus on the study of the turbine.

Especially, the effect of the turbine diameter on the flow characteristicsinside a solar chimney power plant is reported. This paper is identified asimportant to engineers in supplying them technical solutions to enhance theventilation within a solar chimney power plant.   

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