Download or read book Research on Floor supply Displacement Air conditioning System written by 秋元孝之 and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Floor supply Displacement Ventilation System written by Nobukazu Kobayashi and published by . This book was released on 2001 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on indoor environments has received more attention recently because reports of symptoms and other health complaints related to indoor environments have been increasing. Heating, ventilating, and air-conditioning (HVAC) systems are used to control the indoor environment. Therefore, it is necessary to provide a good ventilation system that can provide good indoor environment. To improve indoor air quality, displacement ventilation systems can work well. The system provides fresh air directly to the occupied zone. However, the existing floor-supply displacement ventilation systems have some problems. Hence, the objective of this research was to improve the disadvantages of the current system, and to develop a new design for the floor-supply displacement ventilation system with floor diffusers. The research used numerical simulations through computational-fluid-dynamics (CFD). The experiment was carried out in a full -scale environmental chamber to obtain a reliable data on the floor-supply ventilation system. With the detailed data, the CFD program used in this research was validated. By using the validated program, we conducted numerical simulations of several different cases of the floor-supply system to evaluate the design and the performance of the system. The impacts of several parameters, such as the air change rate, number of diffusers, furniture arrangement, and cooling loads, on the indoor environment were investigated based on the thermal comfort level and indoor air quality. From the results, the parameters were ranked in the order of their impact. This result can be used for more specific case studies of each building design.
Download or read book Underfloor Air Distribution UFAD Design Guide written by Fred S. Bauman and published by Bibliotheca Press. This book was released on 2003 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide is ideal for HVAC design engineers, architects, building owners, facility managers, equipment manufacturers and installers, utility engineers, researchers, and other users of underfloor air distribution (UFAD) technology. UFAD systems are innovative methods for delivering space conditioning in offices and other commercial buildings. Improved Thermal Comfort, Improved Ventilation Efficiency and Indoor Air Quality, Reduced Energy Use and Reduced Life-Cycle Building Costs -- The guide explains these as some of the advantages that UFAD systems have over traditional overhead air distribution systems. This guide provides assistance in the design of UFAD systems that are energy efficient, intelligently operated, and effective in their performance. It also describes important research results that support current thinking on UFAD design and includes an extensive annotated bibliography for those seeking additional detailed information.
Download or read book Displacement Ventilation written by Håkon Skistad and published by Research Studies PressLtd. This book was released on 1994 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: In displacement ventilation systems, the principle of buoyancy is utilised to remove warm contaminated air from an occupied area. The main driving force is natural convection: instead of attempting to combat the forces of natural convection as in mechanical dilution ventilation, displacement systems supply and exhaust air in such a way as not to interfere with the convection currents set up by the heat sources in a space. Provided that pollution and heat sources are in close proximity, displacement ventilation can give better air quality than dilution ventilation, but good design is necessary to ensure that unacceptable vertical temperature gradients and cold draughts along the floor are avoided.
Download or read book A Study of Time dependent Responses of a Mechanical Displacement Ventilation DV System and an Underfloor Air Distribution UFAD System written by Jong Keun Yu and published by . This book was released on 2010 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: As alternative systems for saving cooling energy compared to conventional overhead (OH) air-conditioning systems, mechanical displacement ventilation (DV) systems and underfloor air distribution (UFAD) systems have been widely adopted for commercial buildings. In these alternative systems, supply air is discharged from low momentum diffusers located at lower positions close to the floor in the DV system, and the supply air of the UFAD system is distributed by an underfloor plenum and discharged from floor diffusers. To predict transient vertical temperature responses when the heat source or the ventilation flow rate vary in time, we introduce transient two-layer stratification models of the DV and UFAD systems, non-dimensionalize them by competing the filling box time (Baines & Turner 1969) and the replenishment time in which all the air in the enclosure is replaced by supply air and validate them by laboratory experiments using a salt-water analogy. In various scenarios of the heat source and the ventilation flow rate, the models show a good agreement with the laboratory experiments. Building energy simulation, which predicts cooling and heating demands of a building, has been used for building design, environment, economics, and occupant comfort. EnergyPlus, which is a building energy simulation tools developed by the U.S. Department of Energy, has integrated capability to predict cooling and heating demands as well as the HVAC (heating, ventilation and air conditioning) energy consumption. To evaluate performance of energy savings of UFAD, we developed prototype office buildings adopting OH and UFAD, and the UCSD-UFAD model was used to estimate realistic cooling and heating demands by simulating the stratified temperature profile in a room. In Californian climates, annual electricity consumption of UFAD is always lower than that of OH by up to 20 %, since UFAD has more opportunities to utilize the economizer ``free cooling" compared to OH. For electricity demand reduction of various Demand Response (DR) activities, increasing room set point temperature is the most effective DR activity and UFAD has higher peak demand reduction compared to OH by approximately 6-10 % when the room set point temperature is higher than 26 Celsius.
Download or read book System Performance Evaluation and Design Guidelines for Displacement Ventilation written by Qingyan Chen and published by American Society of Heating Refrigerating and Air-Conditioning Engineers. This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents system performance evaluation, and includes a 10-step design guideline for displacement ventilation systems for U.S. buildings. These design guidelines present two important models: 1) to calculate the temperature difference between the head and the foot level of an occupant; and 2) one to determine the ventilation effectiveness at the breathing level.The book notes that: A displacement ventilation system can provide a thermally comfortable indoor environment at a high cooling load through careful design. The indoor air quality in a space with displacement ventilation is better if the contaminant sources are associates with the heat sources. The displacement ventilation system can also save energy but requires a separate heating system if it is applied to building perimeter zones. 6 x 9, soft cover.
Download or read book Analysis and Design of Heating Ventilating and Air Conditioning Systems Second Edition written by Herbert W. Stanford III and published by CRC Press. This book was released on 2019-04-01 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis and Design of Heating, Ventilating, and Air-Conditioning Systems, Second Edition, provides a thorough and modern overview of HVAC for commercial and industrial buildings, emphasizing energy efficiency. This text combines coverage of heating and air conditioning systems design with detailed information on the latest controls technologies. It also addresses the art of HVAC design along with carefully explained scientific and technical content, reflecting the extensive experience of the authors. Modern HVAC topics are addressed, including sustainability, IAQ, water treatment and risk management, vibration and noise mitigation, and maintainability from a practical point of view.
Download or read book Building Type Basics for Research Laboratories written by Daniel Watch and published by John Wiley & Sons. This book was released on 2008-09-22 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wiley Building Type Basics series provides architects and other professionals with the essential information they need to jumpstart the design of a variety of facilities. This volume covers the design of research laboratories, with the practical information necessary to meet the construction and renovation needs of this increasingly complex industry. Featuring more than 200 illustrations, the Second Edition now addresses laboratory construction in Asia, the Middle East, and Europe, and updates its information for post-9/11 research needs and trends, including the current International Building Codes. New and updated projects from a variety of designers including Duke University's Medical Science Research Building, GlaxoWellcoms laboratories in the UK, and the US government's Argon laboratory.
Download or read book Natural Ventilation for Infection Control in Health care Settings written by Y. Chartier and published by World Health Organization. This book was released on 2009 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guideline defines ventilation and then natural ventilation. It explores the design requirements for natural ventilation in the context of infection control, describing the basic principles of design, construction, operation and maintenance for an effective natural ventilation system to control infection in health-care settings.
Download or read book Development Trends in Building Services Engineering written by Tin Tai CHOW and published by City University of HK Press. This book was released on 2009-02-02 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book assesses the contemporary changes in design concepts and development trends of the major disciplines in building services engineering. Among the analyses featured are trends on heating, ventilating and air-conditioning, electrical and fire services, plumbing and drainage, and building automation systems. Powerful examples of well-known building projects in Hong Kong and Mainland China will be put forward and discussed. Published by City University of Hong Kong Press. 香港城市大學出版社出版。
Download or read book written by and published by Academic Press. This book was released on 2006 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a thorough introduction to how Heating, Ventilating, and Air-Conditioning (HVAC) systems control temperature, air quality, and air circulation in a conditioned space.
Download or read book Ventilation of Buildings written by H.B. Awbi and published by Routledge. This book was released on 2004-06-02 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hazim Awbi's Ventilation of Buildings has become established as the definitive text on the subject. This new, thoroughly revised, edition builds on the basic principles of the original text drawing in the results of considerable new research in the field. A new chapter on natural ventilation is also added and recent developments in ventilation concepts and room air distribution are also considered. The text is intended for the practitioner in the building services industry, the architect, the postgraduate student undertaking courses or research in HVAC, building services engineering, or building environmental engineering, and the undergraduate studying building services as a major subject. Readers are assumed to be familiar with the basic principles of fluid flow and heat transfer and some of the material requires more advanced knowledge of partial differential equations which describe the turbulent flow and heat transfer processes of fluids. The book is both a presentation of the practical issues that are needed for modern ventilation system design and a survey of recent developments in the subject
Download or read book Progress in Applied Mathematical Modeling written by Fengshan Yang and published by Nova Publishers. This book was released on 2008 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents new research related to the mathematical modelling of engineering and environmental processes, manufacturing, and industrial systems. It includes heat transfer, fluid mechanics, CFD, and transport phenomena; solid mechanics and mechanics of metals; electromagnets and MHD; reliability modelling and system optimisation; finite volume, finite element, and boundary element procedures; decision sciences in an industrial and manufacturing context; civil engineering systems and structures; mineral and energy resources; relevant software engineering issues associated with CAD and CAE; and materials and metallurgical engineering.
Download or read book Scale Model Studies of Displacement Ventilation written by Galip Mehmet Okutan and published by . This book was released on 1995 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Displacement ventilation is an air conditioning method that provides conditioned air to indoor environments with the goal to improve air quality while reducing energy consumption. This study investigates the performance of displacement ventilation systems in open plan office environments, focusing on vertical temperature stratification. It explores the possibility of improving the performance of these systems by reducing the temperature stratification at lower levels and allowing them to operate with high cooling loads without exceeding thermal comfort limits. An experimental setup consisting of a scale model of an open plan office room and equipment necessary to provide the experimental conditions was designed and constructed. Steady state experiments on displacement ventilation were conducted. The experiments simulated a variety of cases in terms of heat gain per area, air supply flow rate and slow mixing at lower levels. Temperature distributions in the model and fluid flow rates were measured. Flow visualization was performed to investigate the flow patterns in the office room. The vertical temperature profiles for the considered cases were not linear. The vertical temperature stratification increased when the heat gain in the office increased. It was within the comfort limits for all simulated cases, except the case with the maximum heat gain (38W/m2). The introduction of slow mixing at lower levels decreased the temperature differential in all experiments. This effect of slow mixing was more pronounced at lower heights. This suggested that displacement ventilation may accommodate higher cooling loads if slow mixing at the lower levels is provided. Flow visualization results indicated that the height of the stratification was about 1m above the floor. The plumes over the heat sources had different characteristics, implying the possible importance of the size, shape and spatial distribution of the heat sources.
Download or read book Faber and Kell s Heating and Air Conditioning of Buildings written by Doug Oughton and published by Routledge. This book was released on 2012-05-23 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1997. Routledge is an imprint of Taylor & Francis, an informa company.
Download or read book Building Energy Management Systems written by Geoff Levermore and published by Routledge. This book was released on 2013-07-04 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: revision includes natural ventillation, sick building syndrome, low-energy air conditioning New edition of this well established text Key text for under/post graduate courses in building services
Download or read book Proceedings of the 11th International Symposium on Heating Ventilation and Air Conditioning ISHVAC 2019 written by Zhaojun Wang and published by Springer Nature. This book was released on 2020-03-14 with total page 1419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents selected papers from the 11th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC 2019), with a focus on HVAC techniques for improving indoor environment quality and the energy efficiency of heating and cooling systems. Presenting inspiration for implementing more efficient and safer HVAC systems, the book is a valuable resource for academic researchers, engineers in industry, and government regulators.
