Download or read book Modeling Thermal Comfort Delivered by Wind Towers Using Computational Fluid Dynamics written by Vikram Sami and published by . This book was released on 2003 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design for Outdoor Thermal Comfort written by Jianlin Liu and published by . This book was released on 2017 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residents wish to have outdoor spaces to enjoy walking, cycling, and other recreational activities, which are often hindered by unfavorable thermal comfort conditions, particularly in the summer. High building density lowers the average wind speed and this intensifies the urban heat island effect at the urban scale. The conscientious use of building morphology to create a local thermal comfort zone at selected spots in a large precinct is becoming a pressing issue for sustainable urbanization. Previous studies regarding outdoor thermal comfort were limited to either field measurement or wind environment prediction around buildings in the urban mesoscale. Therefore, this thesis provides a microscale measurement in a precinct at the scale of approximately 200 m at first. Then the wind flow prediction around a single building (or the building with elevated design) surrounding is considered because it is normally employed in practice than the complicated features of building clusters in urban areas. Specifically, on-site monitoring and accurate prediction of the isolated building without an elevated design are the prerequisites of the successful prediction of wind environment and thermal comfort. Three sub-works, namely, (1) assessment of local thermal comfort differences in a precinct, (2) quality assessments and improvements of Computational Fluid Dynamics (CFD) predictions of air flow around an isolated building with different turbulence models, and (3) turbulent flow predictions, wind comfort and thermal comfort assessments around the building with and without the elevated design, were conducted to achieve the research objective. A proof of concept study was conducted in advance via continuous monitoring of the pedestrian level winds and thermal parameters at two sample days in summer, which include instantaneous air temperature, globe temperature, wind speed, and relative humidity. Three outdoor locations at a university campus (at the scale of approximately 200 m) are selected, and daytime thermal perceptions at the three sites were evaluated using Physiological Equivalent Temperature (PET). Meanwhile, a new PET-based index is defined, which is called the normalized environmental parameter difference for air temperature, mean radiant temperature, and wind speed. From the analysis of the simultaneous differences of the three parameters among the monitored spots, wind speed and mean radiant temperature differences that result in significant differences in thermal comfort are shown. This pilot study clearly indicates that wind amplification combined with shading effects can generate thermally comfortable conditions in the open ground floor beneath an elevated building, even on a sunny, hot summer day in a subtropical city. Then, the variations of thermal perceptions are assessed for hot summer, temperate autumn, and cool winter in two outdoor sites on a campus via on-site monitoring at pedestrian level winds and thermal parameters at two sample days (sunny and cloudy). The daytime wind directions are also recorded from a nearby urban weather station and used for the analysis of the influences on the differences of wind and thermal comfort between the two survey sites in different seasons.
Download or read book Advanced Environmental Wind Engineering written by Yukio Tamura and published by Springer. This book was released on 2016-03-25 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is highly suitable for advanced courses as it introduces state-of-the-art information and the latest research results on diverse problems in the environmental wind engineering field. The topics include indoor natural ventilation, pedestrian wind environment, pollutant dispersion, urban heat island phenomena, urban ventilation, indoor/outdoor thermal comfort, and experimental/numerical techniques to analyze those issues. Winds have a great influence on the outdoor environment, especially in urban areas. Problems that they cause can be attributed to either strong wind or weak wind issues. Strong winds around high-rise buildings can bring about unpleasant, and in some cases dangerous, situations for people in the outdoor environment. On the other hand, weak wind conditions can also cause problems such as air pollution and heat island phenomena in urban areas. Winds enhance urban ventilation and reduce those problems. They also enhance natural ventilation in buildings, which can reduce the energy consumption of mechanical ventilation fans and air conditioners for cooling. Moderate winds improve human thermal comfort in both indoor and outdoor environments in summer. Environmental wind engineering associated with wind tunnel experiments and numerical analysis can contribute to solutions to these issues.
Download or read book Computational Fluid Dynamics Applications in Green Design written by Maher Al-Baghdadi and published by . This book was released on 2014-01-03 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term "green design" or "green engineering" has become ubiquitous in recent years, with references even on the covers of trade journals and magazines. With simulation and analysis, going green offers many benefits. Green design defines as "the design, commercialization and use of processes and products that are feasible and economical while reducing the generation of pollution at the source and minimizing the risk to human health and the environment." So while green engineering encompasses environmental engineering, it also can refer to any engineering field in which environmental and human health impacts are minimized. Increasingly, the term has become associated with sustainable development, in which processes and products can continue to be produced indefinitely with a minimum of resource depletion or environmental degradation. Evidence is mounting that the impetus for "going green" and developing environmentally sustainable products is moving away from mere regulatory compliance to the realization that a significant new business opportunity is at hand. The realization marks a dramatic opinion shift. Today, many manufacturers see that developing sustainable products offers a sustainable competitive advantage. Along with increased awareness of environmental impact, well-known corporations have launched campaigns that show how they are developing green technologies. Major companies believe there is money to be made in developing environmentally friendly technology, which should encourage even the most contrarian environmentalist.Computational Fluid Dynamics (CFD) is the science of predicting fluid flow, heat transfer, mass transfer, phase change, chemical reaction, mechanical movement, stress or deformation of related solid structures, and related phenomena by solving the mathematical equations that govern these processes using a numerical algorithm on a computer. The results of CFD analyses are relevant in: conceptual studies of new designs, detailed product development, troubleshooting, and redesign. CFD analysis complements testing and experimentation, by reduces the total effort required in the experiment design and data acquisition. CFD complements physical modelling and other experimental techniques by providing a detailed look into our fluid flow problems, including complex physical processes such as turbulence, chemical reactions, heat and mass transfer, and multiphase flows. In many cases, we can build and analyze virtual models at a fraction of the time and cost of physical modelling. This allows us to investigate more design options and "what if" scenarios than ever before. Moreover, flow modelling provides insights into our fluid flow problems that would be too costly or simply prohibitive by experimental techniques alone. The added insight and understanding gained from flow modelling gives us confidence in our design proposals, avoiding the added costs of over-sizing and over-specification, while reducing risk.The use of Computational Fluid Dynamics to simulate engineering phenomena continues to grow throughout many engineering disciplines. On the back of ever more powerful computers and graphical user interfaces CFD provides engineers with a reliable tool to assist in the design of industrial equipment often reducing or eliminating the need for performing trial-and-error experimentation.The chapters in this book testify to the vitality of engineering CFD research and demonstrate the considerable potential for use of these techniques in the future. The book is intended to serve as a reference for both researchers and postgraduate students.
Download or read book Meta modeling and Optimization of Computational Fluid Dynamics CFD Analysis in Thermal Comfort for Energy efficient Chilled Beams based Heating Ventilation and Air Conditioning HVAC Systems written by Nikhilesh Ghanta and published by . This book was released on 2020 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid rise in the use of air conditioning systems and technological advancements, there is an ever-increasing need for optimizing the HVAC systems for energy efficiency while maintaining adequate occupant thermal comfort. HVAC systems in buildings alone contribute to almost 15% of the overall energy consumption across all sectors in the world and optimizing this would contribute positively towards overcoming climate change and reducing the global carbon footprint. A relatively modern solution is to implement a smart building-based control system and one of the objectives of this study is to understand the physical phenomenon associated with workspaces conditioned by chilled beams and evaluated the methods to reduce energy consumption. Building upon the initial work aimed at creating a workflow for a smart building, this thesis presents the results of both experimental and computational studies of occupant thermal comfort with chilled beams (primarily in conference rooms) and the various inefficiencies associated. Results from these studies have helped to inform an optimum location for the installation of a chilled beam to counter the effects of incoming solar irradiation through an external window while keeping the energy consumption low. A detailed understanding of the various parameters influencing the temperature distribution in a room with chilled beams is achieved using CFD studies and data analysis of experimental data logging. The work converges into a fundamental question of where, how, and what to measure to best monitor and control the human thermal comfort, and a novel technique was presented using the existing sensors which would provide a significant improvement over other existing methods in practice. This technique was validated using a series of experiments. The thesis concludes by presenting early works on hybrid HVAC systems including chilled beams and ceiling fans for higher economic gains. Future work should seek to perform CFD simulations for a better understanding of hybrid HVAC systems, both in conference rooms and open-plan office spaces, and also to design a new sensor that could better estimate human thermal comfort.
Download or read book Engineering Fluid Dynamics written by Bjørn H. Hjertager and published by MDPI. This book was released on 2018-04-06 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Engineering Fluid Dynamics" that was published in Energies
Download or read book Wind Towers written by Battle McCarthy Consulting Engineers and published by Academy Press. This book was released on 1999-08-10 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Detail in Building series is an essential source of contemporary data covering the key elements of building design that form the vocabulary of current architecture. Each is clearly analysed, both historically and in terms of recent examples by key practices around the world. The combination of building context, design aesthetics and technical solution, as revealed in the case studies, is highly informative as well as unique in a field where specific technical quality of design detailing is often insufficiently exposed by the superficial presentation of designs. Wind Towers is the sixth title in the series. From the earliest times, buildings, including igloos, adobe huts, and even termitaries, have been designed to utilise nautral conditions for heating, cooling and ventilation. Today, as structures become larger and lighter, there has been an increasing need for a better understanding of wind behaviour. This has been achieved through knowledge gained from the aeronautical industry, which has provided more accurate wind data and airflow-testing facilities. Ecological concerns also call for better methods of harnessing the free energy available from the environment as an alternative to harmful and expensive artificial air-conditioning systems. This book looks at techniques using natural forces to control temperature and ventilation by means of wind-driven devices such as wind towers and wind scoops. These are analysed and compared in terms of their advantages and applications. Historical models dating back as far as the ancient Egyptian era are cited as precedents, whilst the eighteen case studies provide contemporary examples of the various combinations of solutions that can be applied to a diverse range of buildings in different climates and conditions.
Download or read book Environmental Wind Engineering and Design of Wind Energy Structures written by Charalambos Baniotopoulos and published by Springer Science & Business Media. This book was released on 2011-12-01 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a state-of-the-art in environmental aerodynamics and the structural design of wind energy support structures, particularly from a modern computational perspective. Examples include real-life applications dealing with pollutant dispersion in the building environment, pedestrian-level winds, comfort levels, relevant legislation and remedial measures. Design methodologies for wind energy structures include reliability assessment and code frameworks.
Download or read book Conflation of Computational Fluid Dynamics and Building Thermal Simulation written by Cezar O. R. Negrao and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrating Project Delivery written by Martin Fischer and published by John Wiley & Sons. This book was released on 2017-03-27 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: A revolutionary, collaborative approach to design and construction project delivery Integrating Project Delivery is the first book-length discussion of IPD, the emergent project delivery method that draws on each stakeholder's unique knowledge to address problems before they occur. Written by authors with over a decade of research and practical experience, this book provides a primer on IPD for architects, designers, and students interested in this revolutionary approach to design and construction. With a focus on IPD in everyday operation, coverage includes a detailed explanation and analysis of IPD guidelines, and case studies that show how real companies are applying these guidelines on real-world projects. End-of-chapter questions help readers quickly review what they've learned, and the online forum allows them to share their insights and ideas with others who either have or are in the process of implementing IPD themselves. Integrating Project Delivery brings together the owners, architect, engineers, and contractors early in the development stage to ensure that problems are caught early, and to address them in a collaborative way. This book describes the parameters of this new, more efficient approach, with expert insight on real-world implementation. Compare traditional procurement with IPD Understand IPD guidelines, and how they're implemented Examine case studies that illustrate everyday applications Communicate with other IPD adherents in the online forum The IPD approach revolutionizes not only the workflow, but the relationships between the stakeholders – the atmosphere turns collaborative, and the team works together toward a shared goal instead of viewing one another as obstructions to progress. Integrated Project Delivery provides a deep exploration of this approach, with practical guidance and expert insight.
Download or read book Wind Turbine Aerodynamics Modeling Using CFD Approaches written by Galih Bangga and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As countries seek clean, renewable, low-cost, domestic alternatives to fossil fuels, wind energy is an increasingly important source of power generation worldwide. Scientists and industry professionals require better tools to understand and expand the performance and efficiency. Wind Turbine Aerodynamics Modeling Using CFD Approaches provides a comprehensive and focused introduction to computational approaches for wind turbine aerodynamic calculations, ranging from the simple cost-efficient engineering modeling to high fidelity computational fluid dynamics methods. This broad-reaching book: -- Provides a thorough introduction to numerical methods as applied to the simulation of wind turbine aerodynamics -- Includes a comprehensive and focused introduction to computational approaches for wind turbines -- Provides state-of-the-art information serving as a primer for deeper study The book is an ideal first text for students, researchers, and industry professionals working in wind engineering and in wind energy computations.
Download or read book Computational Fluid Dynamics written by Hyoung Woo Oh and published by BoD – Books on Demand. This book was released on 2010-01-01 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended to serve as a reference text for advanced scientists and research engineers to solve a variety of fluid flow problems using computational fluid dynamics (CFD). Each chapter arises from a collection of research papers and discussions contributed by the practiced experts in the field of fluid mechanics. This material has encompassed a wide range of CFD applications concerning computational scheme, turbulence modeling and its simulation, multiphase flow modeling, unsteady-flow computation, and industrial applications of CFD.
Download or read book Hybrid Energy System Models written by Asmae Berrada and published by Academic Press. This book was released on 2020-11-21 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid Energy System Models presents a number of techniques to model a large variety of hybrid energy systems in all aspects of sizing, design, operation, economic dispatch, optimization and control. The book's authors present a number of new methods to model hybrid energy systems and several renewable energy systems, including photovoltaic, solar plus wind and hydropower, energy storage, and combined heat and power systems. With critical modeling examples, global case studies and techno-economic modeling integrated in every chapter, this book is essential to understanding the development of affordable energy systems globally, particularly from renewable resources. With a detailed overview and a comparison of hybrid energy systems used in different regions, as well as innovative hybrid energy system designs covered, this book is useful for practicing power and energy engineers needing answers for what factors to consider when modeling a hybrid energy system and what tools are available to model hybrid systems. - Combines research on several renewable energy systems, energy storage, and combined heat and power systems into a single informative resource on hybrid energy systems - Includes significant global case studies of current and novel modeling techniques for comparison - Covers numerical simulations of hybrid systems energy modeling and applications
Download or read book Mastering Computational Fluid Dynamics written by Cybellium and published by Cybellium . This book was released on with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Welcome to the forefront of knowledge with Cybellium, your trusted partner in mastering the cutting-edge fields of IT, Artificial Intelligence, Cyber Security, Business, Economics and Science. Designed for professionals, students, and enthusiasts alike, our comprehensive books empower you to stay ahead in a rapidly evolving digital world. * Expert Insights: Our books provide deep, actionable insights that bridge the gap between theory and practical application. * Up-to-Date Content: Stay current with the latest advancements, trends, and best practices in IT, Al, Cybersecurity, Business, Economics and Science. Each guide is regularly updated to reflect the newest developments and challenges. * Comprehensive Coverage: Whether you're a beginner or an advanced learner, Cybellium books cover a wide range of topics, from foundational principles to specialized knowledge, tailored to your level of expertise. Become part of a global network of learners and professionals who trust Cybellium to guide their educational journey. www.cybellium.com
Download or read book Outdoor Wind Speed Enhancement in Residential Precincts in Tropical Cities written by Lup Wai Chew and published by . This book was released on 2019 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind speeds in urban areas are significantly reduced due to the blockage effects of urban structures. Lower wind speeds inhibit passive ventilation and reduce thermal comfort in tropical cities. This thesis uses both experimental and computational fluid dynamics (CFD) modeling to explore the potential of building porosity to increase wind speeds at the pedestrian level. The computational models are first validated with experiments to justify the exclusion of thermal effects, as the models over-predict the thermal effects on heated surfaces. Validated computational simulations show that void decks can increase pedestrian-level wind speeds by more than twofold in two-dimensional urban street canyons. In three-dimensional urban street canyons, void decks not only increase the wind speeds in the street canyons, but also along the streets. The effectiveness of void decks to increase wind speed is significantly influenced by the height of void decks but not the building height. Next, the heat wave in April 2016 in Singapore is simulated with the Weather Research and Forecasting model to identify two residential precincts with high temperatures for detailed case studies. Both selected precincts are simulated with CFD models to obtain the pedestrian-level wind fields. The effects of void decks in these two real urban areas are evaluated by comparing the wind field with void decks to that in the control case without void decks. The first precinct with smooth upwind areas shows significant wind speed enhancement up to 80% of the freestream wind speed (the wind speed above the roof level) with void decks. The second precinct with rough upwind areas shows wind speed enhancement up to 50% of the freestream wind. In conclusion, void decks are an effective architectural intervention to enhance pedestrian-level wind speeds, but the effectiveness is influenced by the upwind conditions.
Download or read book Statistical Theory and Modeling for Turbulent Flows written by P. A. Durbin and published by Wiley-Blackwell. This book was released on 2001-03-12 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most natural and industrial flows are turbulent. The atmosphere and oceans, automobile and aircraft engines, all provide examples of this ubiquitous phenomenon. In recent years, turbulence has become a very lively area of scientific research and application, and this work offers a grounding in the subject of turbulence, developing both the physical insight and the mathematical framework needed to express the theory. Providing a solid foundation in the key topics in turbulence, this valuable reference resource enables the reader to become a knowledgeable developer of predictive tools. This central and broad ranging topic would be of interest to graduate students in a broad range of subjects, including aeronautical and mechanical engineering, applied mathematics and the physical sciences. The accompanying solutions manual to the text also makes this a valuable teaching tool for lecturers and for practising engineers and scientists in computational and experimental and experimental fluid dynamics.
