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Author: Scott Spencer Publisher: ISBN: Category : Buildings Languages : en Pages : 0
Book Description
Natural ventilation driven by a solar chimney attached to a single-room building was studied experimentally using a small-scale model. The experiments were performed using a recently developed fine-bubble technique in which fine hydrogen bubbles are produced electrolytically in salt solution to simulate the buoyancy effect in the chimney caused by temperature differences. During the experiments, one sidewall of the solar chimney was uniformly "heated", corresponding to a uniformly distributed solar radiation incidence. Velocities at the room inlet were measured by a particle tracking method; in turn, the average flow rate through the solar chimney system was determined. Parameters studied in the experiments were the cavity width of the solar chimney, the solar radiation intensity, the ventilation inlet areas, and the solar chimney height. Results showed that for a given building geometry and inlet areas, there is an optimum cavity width at which maximum ventilation flow rate can be achieved. This optimum cavity width, which is independent of the solar radiation intensity, was found to be dependent on the size of the ventilation inlet areas and the solar chimney height. Observations were made on the flow patterns within both the solar chimney and the room. Two simple theoretical models were developed, based on common tools found in literature used for solar chimney ventilation prediction. Comparison between the measured ventilation flow rates and the theoretical predictions indicated that theoretical models, based on simplified temperature assumptions within the chimney, may over-predict the solar chimney ventilation performance and should be used with care.
Author: Scott Spencer Publisher: ISBN: Category : Buildings Languages : en Pages : 0
Book Description
Natural ventilation driven by a solar chimney attached to a single-room building was studied experimentally using a small-scale model. The experiments were performed using a recently developed fine-bubble technique in which fine hydrogen bubbles are produced electrolytically in salt solution to simulate the buoyancy effect in the chimney caused by temperature differences. During the experiments, one sidewall of the solar chimney was uniformly "heated", corresponding to a uniformly distributed solar radiation incidence. Velocities at the room inlet were measured by a particle tracking method; in turn, the average flow rate through the solar chimney system was determined. Parameters studied in the experiments were the cavity width of the solar chimney, the solar radiation intensity, the ventilation inlet areas, and the solar chimney height. Results showed that for a given building geometry and inlet areas, there is an optimum cavity width at which maximum ventilation flow rate can be achieved. This optimum cavity width, which is independent of the solar radiation intensity, was found to be dependent on the size of the ventilation inlet areas and the solar chimney height. Observations were made on the flow patterns within both the solar chimney and the room. Two simple theoretical models were developed, based on common tools found in literature used for solar chimney ventilation prediction. Comparison between the measured ventilation flow rates and the theoretical predictions indicated that theoretical models, based on simplified temperature assumptions within the chimney, may over-predict the solar chimney ventilation performance and should be used with care.
Author: Md. Mizanur Rahman Publisher: Springer Nature ISBN: 9813368314 Category : Technology & Engineering Languages : en Pages : 244
Book Description
This book highlights the design of a new type of solar chimney that has lower height and bigger diameter, and discusses its applications. The bigger diameter chimneys are introduced showing cold inflow phenomena that significantly reduced the performance of solar chimney. The cold inflow-free operation of solar chimneys restores the draft losses and enhances the performance of the solar chimneys. Numerical and experimental investigation results will be presented to highlight the performance of cold inflow-free solar chimney performance. In addition, this book covers the important basic design parameters that affect the design of solar chimney for different applications, mainly, solar chimney-assisted ventilation for passive cooling and power generation system.
Author: Ahmed Abdulnabi Imran Publisher: LAP Lambert Academic Publishing ISBN: 9783659509858 Category : Languages : en Pages : 184
Book Description
Energy consumption in the building sector is clearly an important factor in the total energy bill, and it continues to increase. Cooling and heating in buildings are techniques used to condition their environments, research and development of natural methods for this conditioning are assumed to increase the importance in modern building in order to bring about savings in energy. Depletion of the world fossil fuel reserves and price uncertainty has forced many countries to turn to alternative energy sources to meet their needs. Like many other countries, Iraq, despite its oil wealth, must take steps in studying and utilizing alternative energy sources. Solar energy is one of the potential alternative energy sources, is particularly attractive because it is renewable, nonpolluting and widely available on-site. Solar energy is being used for many purposes, such as electricity generation, refrigeration and air-conditioning applications. Solar chimneys are one kind of renewable energy technologies, which enhance the natural ventilation of buildings.
Author: L. Kirkup Publisher: Cambridge University Press ISBN: 1139454900 Category : Science Languages : en Pages : 196
Book Description
Measurement shapes scientific theories, characterises improvements in manufacturing processes and promotes efficient commerce. In concert with measurement is uncertainty, and students in science and engineering need to identify and quantify uncertainties in the measurements they make. This book introduces measurement and uncertainty to second and third year students of science and engineering. Its approach relies on the internationally recognised and recommended guidelines for calculating and expressing uncertainty (known by the acronym GUM). The statistics underpinning the methods are considered and worked examples and exercises are spread throughout the text. Detailed case studies based on typical undergraduate experiments are included to reinforce the principles described in the book. This guide is also useful to professionals in industry who are expected to know the contemporary methods in this increasingly important area. Additional online resources are available to support the book at www.cambridge.org/9780521605793.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The solar chimney allows natural ventilation to be achieved during periods when the wind velocities are low and the difference between internal and external air temperatures is minimal. The correct design of such building components requires that designers have appropriate design tools available to them that are both effective and easy to use. The aim of this project was to evaluate design tools currently available and if appropriate to provide a tool that would allow the effects of variations in key physical parameters to be evaluated. Two design tools are currently available to designers; zonal models and CFD programmes. Both of these were however found to be unsuitable for the evaluation of the performance of a solar chimney. Zonal models assume that the air within a zone is fully mixed which results in the effects of variations in physical parameters on the mass flow rate being incorrectly predicted. CFD programmes require validation of any models developed before confidence in the predictions can be established, it was found however that data for such validation was not available for realistic flow configurations. An experimental rig was designed and tested to ensure that the uncertainty in the data produced was both minimised and accurately quantified. A detailed review of the sensitivity of a CFD programme to model and input variables was undertaken allowing development of an appropriate model. Comparison of the results of the experimental investigation and CFD predictions showed that the CFD programme, utilising the ke turbulence model accurately predicted air flow rates through a solar chimney across a range of key physical parameter variations. Within the limits of the validity determined for the CFD model, a detailed parametric investigation was then undertaken. The result of the parametric investigation was the development of a design tool appropriate for the determination of the effects of variations of the key physical variables on the mass flow rate t.
Author: Jörg Schlaich Publisher: Edition Axel Menges ISBN: 9783930698691 Category : Architecture Languages : en Pages : 64
Book Description
Solar energy solves many urgent problems of our times -- The solar chimney -- The prototype in Manzanares -- Designing large solar chimneys, their potential and investment costs -- Energy production costs -- Act now!
Author: Nguyen Tien Khiem Publisher: Springer Nature ISBN: 9811632391 Category : Technology & Engineering Languages : en Pages : 1137
Book Description
This proceedings book includes a selection of refereed papers presented at the International Conference on Modern Mechanics and Applications (ICOMMA) 2020, which took place in Ho Chi Minh City, Vietnam, on December 2–4, 2020. The contributions highlight recent trends and applications in modern mechanics. Subjects covered include biological systems; damage, fracture, and failure; flow problems; multiscale multi-physics problems; composites and hybrid structures; optimization and inverse problems; lightweight structures; mechatronics; dynamics; numerical methods and intelligent computing; additive manufacturing; natural hazards modeling. The book is intended for academics, including graduate students and experienced researchers interested in recent trends in modern mechanics and application.
Author: Scott Spencer
Author: Scott Spencer
Author: Md. Mizanur Rahman
Author: Ahmed Abdulnabi Imran
Author: Mohammed Bouhedja
Author: Z.D. Chen
Author: L. Kirkup
Author: 
Author: Jörg Schlaich
Author: Long Shi
Author: Nguyen Tien Khiem