Using ductwork to improve supply plenum temperature distribution in underfloor air distribution (UFAD) system PDF Download
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Author: Wilmer Pasut
Publisher:
ISBN:
Category :
Languages : it
Pages :
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Author: Wilmer Pasut
Publisher:
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Category :
Languages : it
Pages :
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Author: Fred S. Bauman
Publisher: Bibliotheca Press
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 260
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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.
Author: Charles Nehme
Publisher: Charles Nehme
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 76
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Book Description
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.
Author: Vasiliy Khmelenko
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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
Author: Jun Myoung Choi
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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There is considerable growth in popularity of under-floor air distribution (UFAD) systems because of potential energy savings, an improvement in air quality, and thermal comfort over conventional systems. With these advantages, the UFAD system could be an alternative air distribution system potentially superior to traditional overhead system; however, well-developed design methodologies especially for under-floor plenum have not been fully explored. We have considered two issues that lower the performance of under-floor plenum in UFAD system. One is the temperature difference between diffusers results in discomfort for occupants, and the other is the heat transfer across a slab lowers energy efficiency in UFAD system. The Particle Tracking Velocimetry (PTV) experiment was conducted to demonstrate the flow pattern in the plenum, and the computational calculation by commercial FLUENT software was performed to show the flow patterns and physical properties of the flow. In this thesis, the plenum of good performance is defined as the plenum that has lower temperature variation from diffuser to diffuser and lower heat transfer rate across a slab. The objectives of this thesis are to investigate the physical properties of flow in a plenum, and give ideas for reducing temperature variation of air leaving diffusers and heat transfer across a slab.
Author: Jae D. Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 362
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Author: Allan Wesley Daly
Publisher:
ISBN:
Category :
Languages : en
Pages : 434
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Author: Elizabeth Lewis
Publisher: Routledge
ISBN: 1351981730
Category : Architecture
Languages : en
Pages : 330
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Book Description
Architecture 2030; BUG; Biophilic Design; BIPV; Circular Economy; LEED; Passive Design; Solar Chimney; Systems Thinking; WELL; Xeriscaping. What does it all mean? The complex and evolving language used in the sustainable design community can be very challenging, particularly to those new to environmentally friendly and resource-efficient design strategies that are needed today. Definitions of over two hundred terms with further sources. Clearly cross-referenced with Sustainaspeak, Theoryspeak, and Archispeak terms. Illustrated throughout with sustainable award-winning buildings by e.g. Behnisch, Brooks + Scarpa, EHDD, KieranTimberlake, Lake|Flato, Leddy Mahtum Stacy, SmithGroup, Perkins+Will, ZGF, VMDO, and McDonough + Partners. Sustainaspeak: A Guide to Sustainable Design Terms provides a current guide to the sustainable design strategies, terms, and practices needed for the next generation of designers, architects, students, and community leaders to design a carbon-neutral world for future generations.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 284
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Author: Corky Binggeli
Publisher: John Wiley & Sons
ISBN: 1118099354
Category : Architecture
Languages : en
Pages : 498
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Book Description
The new student edition of the definitive reference on architectural interiors Interior Graphic Standards, Student Edition is a carefully edited treatment of the authoritative Interior Graphic Standards Professional Edition. Designed and organized to give students the specific information they require, this is an essential reference for anyone studying architectural interiors. New topics include accessible design basics, computing technologies, fire-resistive construction, fire protection systems, security and communications systems, interior equipment, evidence-based design, and climate considerations. In addition, this second Student Edition offers more material on residential design, is packed with more than 1,300 informative illustrations, and includes the latest coverage for students to find real help understanding the critical material they need for the core classes required by all curriculums. Additional revisions to this edition include: Updated coverage of sustainable design and materials and ADA Standards for Accessible Design Companion website featuring online resources for students Expert advice and details for designing interior project types including commercial, residential, healthcare, retail, hospitality, educational, performance, and museum spaces, as well as existing building interiors Like Interior Graphic Standards Professional Edition, this student edition's Second Edition provides essential specification and detailing information for working inside the structural shell, covering interior partitions and floor systems, updated lighting practices, furnishings, equipment, and wall, floor, and ceiling finishes.
