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Thermal Analyses of Combined Utilization Process of Seawater by solar chimney

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Transactions of Tianjin University 2009年第6期15卷 393-399页

作者：王一平方振雷朱丽 School of Chemical Engineering and Technology Tianjin University School of Architecture Tianjin University

It is promising to simultaneously develop multiple products through the combined utilization of seawater by solar chimney technology. A small scale experimental system was set up. The collector temperature, the seawater temperature, and the temperature and humidity of the airflow under the collector were measured. Thermal network analysis of the system was carried out. The results show that the airflow is nearly saturated at the entrance of the chimney, and the mean dry-bulb and wet-bulb temperatures of the airflow have increased by 8.4 ℃ and 9.6 ℃, respectively. The radiation heat transfer between the collector and the sky is the biggest heat loss in the system, which is up to 29.1% on average of the solar energy. However, the water evaporation heat is about 23.6% on average of the solar energy. To reduce the heat loss and enhance the water evaporation, it is necessary to reduce the emissivity and thermal conductivity of the collector and increase the evaporation areas.

关键词： solar chimney combined utilization of seawater thermal network enhanced evaporation

Effect of chimney shadow on the performance of wind supercharged solar chimney power plants:A numerical case study for the Spanish prototype

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Global Energy Interconnection 2021年第4期4卷 405-414页

作者： Lu Zuo Pengzhan Dai Ling Ding Ziyang Yan Xinru Wang Jiachen Li College of Energy and Electrical Engineering Hohai UniversityNanjing 210098P.R.China Shanghai Electric Group Company Limited Shanghai 200122P.R.China

Three-dimensional numerical simulations for a solar chimney power plant(SCPP)and wind supercharged solar chimney power plant(WSSCPP)based on the Spanish prototype using the solar ray-tracing algorithm were performed to study the shadow effect of the *** area of the shadow region increases with an increase in the incident angle of the solar rays.A parametric study was performed by varying the incident angle from 0°to 30°.The temperature and velocity distributions at different incident angles were *** addition,we investigated the chimney shadow effect in several comprehensive SCPP *** findings show that the turbine shaft powers of the SCPP and WSSCPP were reduced by 22.4%and 13.7%,respectively,when the incident angle increased from 0°to 30°.In conclusion,it is important to consider the chimney shadow effect when estimating the performance in the design and cost analysis of SCPP systems.

关键词： solar chimney Shadow effect Wind pressure ventilator Turbine solar ray-tracing algorithm

Performance Investigation of the solar chimney Power Plants Heater Case Study in Aswan, Egypt

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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

Exhaust Ventilation through a solar chimney： A Response to High Hermeticity in Welfare Housing

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Journal of Civil Engineering and Architecture 2015年第7期9卷 767-774页

作者： Marcos Eduardo Gonzalez-Trevizo Adolfo Gomez-Amador Anibal Luna-Leon Carlos Escobar-Del POZO Carlos Javier Esparza Lopez Facultad de Arquitectura (Faculty of Architecture) Universidad Michoacana de San Nicoldls de Hidalgo (Michoacan Universityof Saint Nicholas of Hidalgo) Morelia MN 58030 Mexico Facultad de Arquitectura y DiseFzo (Faculty of Architecture and Design) Universidad de Colima (University of Colima) ColimaCL 28400 Mexico Facultad de Arquitectura y Diseho (Faculty of Architecture and Design) Universidad Aut6noma de Baja California (BajaCalifornia Autonomous University) Mexieali BC 21280 Mexico Facultad de Ingenieria Mecnica y Elctrica (Faculty of Mechanical and Electrical Engineering) Universidad de ColimaColima CL 28400 Mexico

This research reports on potentiality in the solar chimney as an exhaust ventilation device through a hypothetical statement that convenient weather conditions exist on sub-humid warm climate to enhance the performance ofa SC （solar chimney）, in order to increase ventilation to dissipate metabolic heat from inhabitants of airtight buildings. The methodology used in this research integrates the use of simplified mathematical models that predict in a semi-empirical way a potential volume flow through estimation of kinetic power generation, by natural circulation and stack effect in a typical covered-plate air solar collector. The study was carried out during the warm month of April, an important warm season for Colima, where the prevailing wind is about 6.8 m/s, the average temperature of maximums and minimums oscillates between 15.4℃and 34.4 ℃ with average relative humidity of 65% according to national weather service. A scale model of the SC was installed on environmental chambers. The results showed that this device is capable of generating ventilation conditions around light breeze parameters near between 0.6 m/s and 1.5 m/s width, a better performance at day in 45% approximately than the night values, making ventilation rates up 0.24 ACH （air changes per hour） as average air change rate.

关键词： Exhaust ventilation solar chimney air solar collector welfare housing.

Estimate the Ventilation Effect from Wire Mesh Screen Assisted solar chimney

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Journal of Energy and Power Engineering 2018年第3期12卷 127-131页

作者： Md.Mizanur Rahman Mohd.Suffian Bin Misaran Mohd.Jamrye Bin Jamanun Ahmed Jawad Faculty of Engineering Universiti Malaysia SabahKota KinabaluSabah 88400Malaysia

In 1750s European houses, chimneys are used to remove smoke and dust particle from the fire place to the ambient. At present the applications of chimneys are extended for house ventilation, which is known as solar chimney assisted ventilation system. In this paper, the effect of wire mesh screen on chimney assisted ventilation system is studied and presented. Natural draft chimney integrated with solar heating system that is known as solar chimney, can be used for building ventilation. Number of research works had been conducted on different types of solar chimney to enhance the building ventilation performance. In this study a solar chimney model is designed and modified with wire mesh screens. An electric heating system is installed in the models to replace the solar absorber in the solar chimney. The airflow rates and the exit air temperatures are also measured and compared for normal chimney and modified chimneys under different heat loads. The performances of the chimneys are evaluated to determine the effects of wire mesh screen on the solar chimney. Experimental results indicated the solar chimney model with 0.64 mm × 0.64 mm pore size wire mesh screen at the exit is able to enhance velocity and the exit air temperature are about 54% and 41%, respectively. It has been concluded that the wire mesh screen has significant effect of model solar chimney and is able to enhance the performance.

关键词： solar chimney natural ventilation wire mesh screen.

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

Experimental Investigation of solar chimney Power Plant

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Journal of Energy and Power Engineering 2013年第10期7卷 1980-1984页

作者： Oboetswe Motsamai Lesedi Bafetanye Kobamelo Mashaba Oaitse Kgaswane Department of Mechanical Engineering University of Botswana Private Bag 061 Gaborone Botswana Botswana Technology Centre Private Bag 0082 Gaborone Botswana

The paper investigated the performance of a solar chimney, by measuring the chimney air temperature and velocity. A short solar chimney prototype was designed and constructed at Botswana Technology Center. A wind turbine was installed to rotate a small DC generator. Temperatures and velocities were measured at different times of the day with thermocouples and hotwire anemometer, respectively. Irradiance was measured with pyranometer. A Delta-T data logger was used to store data at intervals of 30 s. Various graphs depicting the influence of irradiance on temperature, velocity and power have been plotted. Irradiance was found to affect the chimney temperature and subsequently affects chimney air velocity and power produced. Ambient air （wind） velocity was found to have influence on the performance of the solar chimney by increasing chimney air velocity.

关键词： solar chimney performance turbine temperature velocity.

Performance Evaluation of solar chimney Draft: Application to Ventilation

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Smart Grid and Renewable Energy 2024年第4期15卷 107-122页

作者： Boukaré Ouedraogo Adama Ouedraogo Arouna Kabore Kalifa Palm Dieudonné Joseph Bahiebo Laboratoire dEnergies Thermiques Renouvelables (LETRE) Universit Joseph KI-ZERBO: UFR/SEA Ouagadougou Burkina Faso Laboratoire de Chimie Analytique Physique Spatiale et Energtique (LACAPSE) Universit Norbert ZONGO Koudougou Burkina Faso Centre Universitaire Polytechnique de Kaya (CUP-Kaya) Universit Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire des Systmes dEnergie Renouvelable et Environnement Institut de Recherche en Sciences Appliques et Technologies (IRSAT) Centre National de la Recherche Scientifique et Technologique (CNRST) Ouagadougou Burkina Faso

Ventilation is one of the factors contributing to energy consumption in buildings and food preservation. The solar chimney proves to be an alternative for reducing conventional energy consumption. Thus, in this study, the performance of a solar chimney with two active faces for thermally drawing air from a chamber for preserving agri-food products was evaluated. These performances were experimentally assessed through data measurements: temperatures and velocities within the chimney, and their analysis using Excel and MATLAB. The obtained results were compared with those from literature to verify their validity. From this study, it is found that the maximum temperature at the chimney outlet reaches 49.4˚C with an average value of 43.7˚C. Additionally, the heating evolution of the chimney air presents four (04) identical phases in pairs, reflecting the chimney’s operation throughout day. The temperature difference between the outlet and inlet of the chimney reaches a maximum of 17˚C with an average of 12.6˚C. Regarding airflow, the maximum air velocity at the chimney outlet is 0.8 m/s, and the average velocities have consistently been greater than or equal to 0.46 m/s. Thus, it can be concluded that the solar chimney is capable of providing ventilation for the preservation chamber through thermal draft.

关键词： solar chimney Natural Ventilation Thermal Draft Airflow chimney Effect

Wind-Thermal Environmental Characteristic of Multi-Variable Passive Enhanced Natural Ventilation System for High and Large Space Building

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Journal of Harbin Institute of Technology(New Series) 2023年第5期30卷 34-51页

作者： Lin Liu Haoran Huang Chenghe Wu Liru Liu Jing Tian School of Civil and Transportation Engineering Guangdong University of TechnologyGuangzhou510006China Architectural Design and Research Institute of Guangdong Province Guangzhou510010China

Natural ventilation effects in high and large space buildings of tropical areas greatlya ffect the air conditioning energy *** at nearly zero energy building design,thisp aper mainly contributes to provide theoretical basis and reference for thermal comfortable air conditioning system design of high and large space *** a theatre in Hainan as study object,a newly composite enhanced natural ventilation system is proposed by integrating theu nderground tunnel-based earth to air heat exchange system and the solar *** uantity,air velocity and air temperature field,human vertical temperature gradient differenceu nder24simulation working conditions are considered and analyzed by using ANSYS *** he underground tunnel,results show that Group Two with double underground tunnels and side airs upply location shows its advantages in cooling effects and air supply *** for the solar chimney,results show that the solar radiation intensity contributes to larger difference int ransmission power and leads to different cooling *** the whole,the system under workingc ondition No.7with120m long,side air supply,double underground tunnel and20m high,1mw ide,0.6°absorber plate angle solar chimney shows its priority in better comprehensive performance.

关键词： natural ventilation solar chimney earth to air heat exchange system energyc onservation thermal environment