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Performance Investigation of the Solar Chimney Power Plants Heater Case Study in Aswan, Egypt

Journal of Power and Energy Engineering 2016年第10期4卷 39-60页

作者： magdy bassily hanna Tarek Abdel-Malak Mekhail Omar Mohamed Dahab Mohamed Fathy Cidek Esmail Ahmed Rekaby Abdel-Rahman Mechanical Power and Energy Department Faculty of Engineering Minia University Minia Egypt Mechanical Power Department Faculty of Energy Engineering Aswan University Aswan Egypt Mechanical Power Department Faculty of Engineering Aswan University Aswan Egypt

Solar collector is a thermal device that uses the heated air in the power generation and many engineering applications. The purpose of the present work is to study the performance and temperature distribution for the solar collector which uses heated air in solar chimney power generation that it consist of three parts, a turbine-generator unit which is used in the generation of electric energy, and cylindrical chimney is fixed vertically and finally a solar collector under the climatic conditions of Egypt-Aswan is studied. This site is specified as the hottest site because the nearest of this location from the Tropic of cancer. Experiments are performed in ten summer days of May and June 2015 with different solar radiations and clarity of the sky. Hourly values of global solar radiation and some meteorological data (temperature, pressure, velocity, etc.) for measuring days are obtained by measuring devices. Inlet and outlet temperatures of air from a solar collector and velocity at junction region. In this work, attempt has been made to present the effect of environmental factors such as ambient temperature, the clarity of the sky and solar radiation on the performance of solar collector. The temperature of the base and the cover of the solar collector, the variation of solar radiation, solar collector efficiency, heat transfer coefficient, the velocity at the junction region between the chimney base, the outlet of the solar collector and temperature distribution along the air heater are discussed. A prediction for the results of the solar collector were performed by using developed theoretical model was made by this study which is based on the previous works. The numerical study has used a commercial code CFX, ANSYS 16.1 to simulate the flow through the collector. The study show that the outlet air temperatures from the solar collector and the velocity at the junction are depending on the climate condition such as ambient temperature and solar radiation, the differ

关键词： Solar Chimney Solar Collector Natural Convection Computational Fluid Dynamic

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Experimental and Numerical Investigation of the Solar Chimney Power Plant’s Turbine

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Open Journal of Fluid Dynamics 2016年第4期6卷 332-342页

作者： magdy bassily hanna Tarek Abdel-Malak Mekhail Omar Mohamed Dahab Mohamed Fathy Cidek Esmail Ahmed Rekaby Abdel-Rahman Faculty of Engineering Mechanical Power and Energy Department Minia University Minia Egypt Faculty of Energy Engineering Mechanical Power Department Aswan University Aswan Egypt Faculty of Engineering Mechanical Power Department Aswan University Aswan Egypt

The solar chimney power plant is a relatively new electricity generation concept, based on renewable energy, combining the greenhouse effect with the chimney suction. The solar chimney powerplant consists of three parts, the solar collector, the chimney and the turbine generator unit, of which the study was focused on the later part. To evaluate the turbine performance inside the solar chimney powerplant, experimental system was constructed in Aswan, Egypt that has a metrological site (23°58'N and 32°47'E) occurs. The system was constructed to evaluate the performance of the solar chimney turbine and power generation characteristic in the hottest site where Aswan is located at the nearest of the Tropic of Cancer at the summer season. Velocity, electric power generation and the turbine efficiency are studying in this work. The numerical analyses were performed by using a commercial code CFX, ANSYS 16.1 to simulate the flow through the turbine and overall system. The study shows that the range of power generated (1.2 W - 4.4 W). It can be estimated, according to the results, the variation trend in pressure drops with the turbine rotation speed increase with small differences when the turbine rotation speed surpasses 1800 rpm with average efficiency of 57%. It is concluded that the theoretical model is basically valid for the system under study, and the CFD simulation can be used conveniently to predict the performance of the system, the comparison between them and experimental result shows a good agreement.

关键词： Solar Chimney Natural Convection Turbine Modeling CFD

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Experimental Study of Filling Ratio Effect on the Thermal Performance in a Multi-Heat Pipe with Graphene Oxide/Water Nanofluids

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World Journal of Nano Science and Engineering 2016年第4期6卷 153-164页

作者： Mohamed Salem Tarek A. Meakhail magdy A. bassily Shuichi Torii Department of Mechanical Engineering Faculty of Energy Engineering Aswan University Aswan Egypt Graduate School of Science and Technology Kumamoto University Kumamoto Japan Department of Mechanical Engineering Faculty of Engineering Minia University Minia Egypt

This experimental study is performed to investigate heat transfer performance of a multi-heat pipe cooling device in the condition of different filling ratios (40%, 60%, 80% and 100%) and different constant heat fluxes (10 - 30 W). Here, pure water (distilled water) and graphene oxide (GO)/water nanofluids are employed respectively as working fluid. GO/water nanofluids were synthesized by the modified Hummers method with 0.05%, 0.10%, 0.15%, and 0.20% volume concentrations. Multi-heat pipe is fabricated from copper;the heating and cooling sections are the same size and both are connected by four circular parallel tubes. Temperature fields and thermal resistance are measured for different filling ratio, heat fluxes and volume concentrations. The results indicated that the thermal performance of heat pipe increased with increasing the concentration of GO nanoparticles in the base fluid, while the maximum heat transfer enhancement was observed at 0.20% volume concentration. GO/water nanofluids showed lower thermal resistance compared to pure water;the optimal thermal resistance was obtained at 100% filling charge ratio with 0.20% volume concentration. Studies were also demonstrated that heat transfer coefficient of the heat pipe significantly increases with increasing the input heat flux and GO nanoparticles concentration.

关键词： Multi-Heat Pipe Graphene Oxide Filling Ratio Volume Fraction Thermal Resistance

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Heat Transfer Performance of a Multi-heat Pipe Using Graphene Oxide/Water Nanofluid

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Journal of Energy and Power Engineering 2017年第2期11卷 95-102页

作者： Mohamed Salem Tarek A. Meakhail magdy A. bassily Shuichi Torii Department of Mechanical Engineering Faculty of Energy Engineering Aswan University Aswan 81528 Egypt Department of Mechanical Engineering Faculty of Engineering Minia University Minia 61519 Egypt Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan

A multi-heat pipe is a device for heat transmission. It is composed of a heating section, a cooling section and an adiabatic section. The heating and cooling sections are the same and both are connected by four circular parallel tubes. This experimental study is performed to investigate heat transfer performance of a multi-heat pipe in the vertical orientation using pure water and GO （graphene oxide）/water nanofluid. GO/water nanofluids were synthesized by the modified Hummers method with 0.05%, 0.1%, 0.15%, and 0.2% volume concentrations. The thermal performance has been investigated with varying heat flux in the range of 10-30 W and 100% fill charge ratio. Wall temperature, thermal resistance, and heat transfer coefficient of the heat pipe are measured and compared with those for the heat pipe using pure water. The experimental results show that the evaporator wall temperature with GO nanofluid is lower than that of the base fluid. Also, the heat pipe that charged with nanofluids showed lower thermal resistance compared with pure water. Heat transfer enhancement is caused by suspended nanoparticles and is pronounced with the increase in particle volume fraction.

关键词： Nanofluid graphene oxide multi-heat pipe thermal performance.

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