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 Underfloor Air Distribution A Comprehensive Guide to Modern HVAC Systems written by Charles Nehme and published by Charles Nehme. This book was released on with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growing demand for energy-efficient, sustainable, and flexible building systems has reshaped how we design and operate modern workspaces. As a crucial component of contemporary HVAC systems, Underfloor Air Distribution (UFAD) technology offers an innovative approach to air delivery that can significantly enhance both occupant comfort and energy efficiency. This book aims to provide a comprehensive guide for engineers, architects, facility managers, and professionals involved in the design, installation, and operation of UFAD systems. Over the past few decades, the evolution of building technologies has prompted a shift away from traditional overhead air distribution systems. UFAD systems, with their ability to deliver conditioned air directly from the floor, are proving to be particularly effective in open-plan offices, data centers, and spaces requiring adaptive layouts. However, as with any system, the success of a UFAD system hinges on a thorough understanding of its design principles, proper installation, and ongoing maintenance. This book was born out of the need for a clear, structured resource that can guide professionals through the complexities of UFAD—from the fundamental science behind air distribution to the nuances of real-world system implementation. Each chapter builds upon the last, starting with an introduction to UFAD and gradually delving into more detailed aspects like airflow dynamics, commissioning, and sustainability. While UFAD offers numerous benefits, such as increased energy efficiency, improved thermal comfort, and design flexibility, these advantages are realized only when the system is designed and maintained with precision. Throughout this book, we will explore not only the technical aspects of UFAD systems but also practical insights and lessons learned from successful projects. I hope that this book serves as a valuable resource for professionals at all levels—whether you are considering UFAD for a new construction project or seeking ways to optimize an existing system. By understanding both the opportunities and challenges that UFAD presents, you can leverage this technology to create more comfortable, energy-efficient, and adaptable environments. Thank you for embarking on this journey into the world of UFAD. I am confident that, together, we can push the boundaries of what is possible in building design and air distribution.
Download or read book UFAD Guide written by Ashrae and published by Ashrae. This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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"--
Download or read book Alternative Air Conditioning Technologies written by and published by . This book was released on 2004 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Underfloor Air Distribution UFAD written by Liangcai Tan and published by . This book was released on 2008 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project covered the laboratory investigation phase of Task 2 where the performance and cost effectiveness of underfloor air distribution and conventional air distribution systems were compared.
Download or read book UFAD O M Guide written by American Society of Heating, Refrigerating and Air-Conditioning Engineers and published by . This book was released on 2016 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the use of underfloor air distribution (UFAD) systems increases,so does the importance of effective operation and maintenance (O&M) of these systems after installation. As UFAD technology is applied, designers, technicians, facility managers, and building owners or their representatives all need to know how to ensure that these often mission-critical systems operate as intended. This guide supplements UFAD Guide: Design, Construction and Operation of Underfloor Air Distribution Systems, providing specific, practical advice beyond design, construction, and startup into successful ongoing operation and maintenance. Installers, technicians, and building owners will find this booklet a valuable resource for getting the most out of their UFAD systems and maintaining those systems¿ useful lives.
Download or read book Performance of Underfloor Air Distribution in a Fieldsetting written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Underfloor air distribution (UFAD) is a new method of supplying heated or cooled air throughout a building. Reported advantages of UFAD include energy savings and improved indoor air quality (IAQ). We measured several aspects of the performance of an UFAD system installed in a medium-size office building. The measured air change effectiveness was very close to unity, which is comparable to that measured in buildings with typical overhead air distribution. The pollutant removal efficiency for carbon dioxide was 13% higher than expected in a space with well-mixed air, suggesting a 13% reduction in exposures to occupant generated pollutants. The increase in indoor air temperatures with height above the floor was only 1 to 2 C. This amount of thermal stratification could reduce the sensible energy requirements for cooling of outdoor air by approximately 10%. The occupant's level of satisfaction with thermal conditions was well above average and this high satisfaction rating could possibly be due, in all or part, to the use of a UFAD system. The results of this study provide some evidence of moderate energy and IAQ-related benefits of UFAD. Before general conclusions are drawn, the benefits need to be confirmed in other studies.
Download or read book Fluid Mechanics and Fluid Power written by T. Prabu and published by Springer Nature. This book was released on 2021-08-03 with total page 901 pages. Available in PDF, EPUB and Kindle. Book excerpt: div="" style="" This book comprises select proceedings of the 46th National Conference on Fluid Mechanics and Fluid Power (FMFP 2019). The contents of this book focus on aerodynamics and flow control, computational fluid dynamics, fluid structure interaction, noise and aero-acoustics, unsteady and pulsating flows, vortex dynamics, nuclear thermal hydraulics, heat transfer in nanofluids, etc. This book serves as a useful reference beneficial to researchers, academicians and students interested in the broad field of mechanics. ^
Download or read book Using ductwork to improve supply plenum temperature distribution in underfloor air distribution UFAD system written by Wilmer Pasut and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book UFAD O M Guide written by ASHRAE. and published by . This book was released on with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A comprehensive guide on the operations and maintenance of underfloor air distribution systems. Offers practical advice for the builder, technician, and building owner or their representative"--
Download or read book Advanced Building Technologies for Sustainability written by Asif Syed and published by John Wiley & Sons. This book was released on 2012-07-03 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Practical solutions for sustainability In this timely guide, one of the world's leaders in advanced building technology implementation shows architects and engineers proven and practical methods for implementing these technologies in sustainably-designed buildings. Because of the very limited time architects are given from being awarded a project to concept design, this book offers clear and workable solutions for implementing solar energy, radiant heating and cooling floors, displacement ventilation, net zero, and more. It provides helpful tips and suggestions for architects and engineers to work together on implementing these technologies, along with many innovative possibilities for developing a truly integrated design. This book also explores and explains the many benefits of advanced technologies, including reduced greenhouse gas emissions, lower operating costs, noise reduction, improved indoor air quality, and more. In addition, Advanced Building Technologies for Sustainability: Offers detailed coverage of solar energy systems, thermal energy storage, geothermal systems, high-performance envelopes, chilled beams, under-floor air distribution, displacement induction units, and much more Provides case studies of projects using advanced technologies and demonstrates their implementation in a variety of contexts and building types Covers the implementation of advanced technologies in office towers, large residential buildings, hospitals, schools, dormitories, theaters, colleges, and more Complete with a clear and insightful explanation of the requirements for and benefits of acquiring the U.S. Green Building Council's LEED certification, Advanced Building Technologies for Sustainability is an important resource for architects, engineers, developers, and contractors involved in sustainable projects using advanced technologies.
Download or read book Alternative Air Conditioning Technologies written by Tom Webster and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent trends in today's office environment make it increasingly more difficult for conventional centralized HVAC systems to satisfy the environmental preferences of individual officer workers using the standardized approach of providing a single uniform thermal and ventilation environment. Since its original introduction in West Germany during the 1950s, the open plan office containing modular workstation furniture and partitions is now the norm. Thermostatically controlled zones in open plan offices typically encompass relatively large numbers of workstations in which a diverse work population having a wide range of preferred temperatures must be accommodated. Modern office buildings are also being impacted by a large influx of heat-generating equipment (computers, printers, etc.) whose loads may vary considerably from workstation to workstation. Offices are often reconfigured during the building's lifetime to respond to changing tenant needs, affecting the distribution of within-space loads and the ventilation pathways among and over office partitions. Compounding this problem, there has been a growing awareness of the importance of the comfort, health, and productivity of individual office workers, giving rise to an increased demand among employers and employees for a high-quality work environment. During recent years an increasing amount of attention has been paid to air distribution systems that individually condition the immediate environments of office workers within their workstations to address the issues outlined above. As with task/ambient lighting systems, the controls for the ''task'' components of these systems are partially or entirely decentralized and under the control of the occupants. Typically, the occupant has control over the speed and direction, and in some cases the temperature, of the incoming air supply. Variously called ''task/ambient conditioning, '' ''localized thermal distribution, '' and ''personalized air conditioning'' systems, these systems have been most commonly installed in open-plan office buildings in which they provide supply air and (in some cases) radiant heating directly into workstations. TAC systems can be classified into the following two major categories: (1) furniture-based, and (2) floor-based, underfloor air distribution (UFAD). A large majority of these systems include a raised floor system with which underfloor plenums are used to deliver conditioned air to the space through floor grills, or in conjunction with the workstation furniture and partitions.
Download or read book Taguchi s Quality Engineering Handbook written by Genʼichi Taguchi and published by Wiley-Interscience. This book was released on 2005 with total page 1708 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last fifty years, one man stands out as the driving force behind the quality revolution--Genichi Taguchi. Now, for the first time in one volume, Taguchi's Quality Engineering Handbook presents all the methods and beliefs that have made Taguchi one of the most respected authorities on quality engineering and management in the world. No other single volume presents the full breadth of founding beliefs behind the successful engineering practices used by today's leading companies. (Midwest).
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 Effective Daylighting with High Performance Facades written by Kyle Konis and published by Springer. This book was released on 2017-05-09 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book explores advanced building-facade daylighting design practices based on diverse energy and human-factor performance metrics. It also defines effective daylighting by rethinking the simplified approach to glazing and facade systems to incorporate the local climate and the needs of building occupants as critical drivers of building performance, design solutions and technological innovation. It discusses state-of-the-art approaches in the context of simulation-based design workflows, innovative technologies and real project case studies, all targeting low and net-zero energy solutions that enhance occupant comfort. Readers benefit from a comprehensive approach that improves the feedback loop between design intent and performance in use. The book is intended for architects, lighting designers, facade engineers, manufacturers and building owners/operators, as well as advanced students.
Download or read book Performance and Optimization of an Underfloor Air Distribution System in an Educational Building in a Hot and Humid Climate written by Vasiliy Khmelenko and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Today there is a proliferation of different HVAC system configurations. Design and performance of each HVAC system are dependent on climate and the intended use of the building. Energy recovery ventilation is becoming more common in new buildings and is one of the more popular retrofit options in hot and humid climates. Currently there is a lack of optimization strategies that involve the underfloor air systems combined with Energy Recovery Ventilation (ERV) especially in hot and humid climate. This thesis examines the performance and optimization of underfloor air distribution systems (UFAD) in hot and humid climates. This thesis also compares the UFAD system performance to a typical overhead air handler unit (AHU) system found in Texas. The performance comparison is done with EnergyPlus modeling software. Separate sets of models are created to examine performance of at different operational parameters. The minimum air flow rates are modeled at 0.1 cfm/ft2, 0.2 cfm/ft2, 0.3 cfm/ft2, 0.4 cfm/ft2 for both UFAD and overhead (OH) systems. The supply air temperatures were modeled at 55°F, 60°F, and 63°F. Outside air strategies include simple economizer, energy recovery ventilation (ERV), as well as a combination of both economizer and ERV. The study found that at low minimum (0.1 cfm/ft2) flow rates an overhead system will slightly outperform a UFAD system (OH 2.6% cheaper to operate than UFAD) while at 0.3 cfm/ft2 a UFAD system is more efficient (UFAD 14.8% cheaper to operate). The outside air strategies have the same energy savings effect on both systems. The UFAD system has a higher peak cooling load and a lower peak heating load compared to the overhead system. This thesis also covers the stratification and supply air temperature measurements within two offices inside the Mitchell Physics building, located on the Texas A&M campus. The stratification measurements showed that on average the stratification was lower than expected for such systems with office 411 having average stratification of 1.8°F and office 423 average stratification of 1.5°F. Temperature measurements at the diffuser level showed some reheat, especially during unoccupied periods such as early mornings, late evenings and weekends, even when the outside temperature was above the interior thermostat set point. System level total supply air flow rate showed little variation with a minimum of 0.47 cfm/ft2 and a maximum of 0.59 cfm/ft2. The analysis of energy recovery wheel operation concluded that the low exhaust air flow of only 0.2 of the outside air is responsible for the low temperature difference observed in the outside air stream through the ERV. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155245
