Effect of Building Airtightness and Fan Size on the Performance of Mechanical Ventilation Systems in New U.S. Houses PDF Download
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Author: Judy Alice Roberson
Publisher:
ISBN:
Category :
Languages : en
Pages : 294
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Author: Judy Alice Roberson
Publisher:
ISBN:
Category :
Languages : en
Pages : 294
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
Most dwellings in the United States are ventilated primarily through leaks in the building shell (i.e., infiltration) rather than by whole-house mechanical ventilation systems. Consequently, quantification of envelope air-tightness is critical to determining how much energy is being lost through infiltration and how much infiltration is contributing toward ventilation requirements. Envelope air tightness and air leakage can be determined from fan pressurization measurements with a blower door. Tens of thousands of unique fan pressurization measurements have been made of U.S. dwellings over the past decades. LBNL has collected the available data on residential infiltration into its Residential Diagnostics Database, with support from the U.S. Department of Energy. This report documents the envelope air leakage section of the LBNL database, with particular emphasis on new construction. The work reported here is an update of similar efforts carried out a decade ago, which used available data largely focused on the housing stock, rather than on new construction. The current effort emphasizes shell tightness measurements made on houses soon after they are built. These newer data come from over two dozen datasets, including over 73,000 measurements spread throughout a majority of the U.S. Roughly one-third of the measurements are for houses identified as energy-efficient through participation in a government or utility program. As a result, the characteristics reported here provide a quantitative estimate of the impact that energy-efficiency programs have on envelope tightness in the US, as well as on trends in construction.
Author:
Publisher:
ISBN:
Category : Dwellings
Languages : en
Pages : 240
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Author: Max Howard Sherman
Publisher: ASTM International
ISBN: 0803114516
Category : Buildings
Languages : en
Pages : 307
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Author: Mat Santamouris
Publisher: Routledge
ISBN: 1136570721
Category : Architecture
Languages : en
Pages : 332
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Book Description
Ensuring optimum ventilation performance is a vital part of building design. Prepared by recognized experts from Europe and the US, and published in association with the International Energy Agency's Air Infiltration and Ventilation Centre (AIVC), this authoritative work provides organized, classified and evaluated information on advances in the key areas of building ventilation, relevant to all building types. Complexities in airflow behaviour, climatic influences, occupancy patterns and pollutant emission characteristics make selecting the most appropriate ventilation strategy especially difficult. Recognizing such complexities, the editors bring together expertise on each key issue. From components to computer tools, this book offers detailed coverage on design, analysis and performance, and is an important and comprehensive publication in this field. Building Ventilation will be an invaluable reference for professionals in the building services industry, architects, researchers (including postgraduate students) studying building service engineering and HVAC, and anyone with a role in energy-efficient building design.
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ISBN:
Category :
Languages : en
Pages : 2
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?Ventilation system effectiveness testing was conducted at two unoccupied, single-family, detached lab homes at the University of Texas - Tyler. Five ventilation system tests were conducted with various whole-building ventilation systems. Multizone fan pressurization testing characterized building and zone enclosure leakage. PFT testing showed multizone air change rates and interzonal airflow filtration. Indoor air recirculation by a central air distribution system can help improve the exhaust ventilation system by way of air mixing and filtration. In contrast, the supply and balanced ventilation systems showed that there is a significant benefit to drawing outside air from a known outside location, and filtering and distributing that air. Compared to the Exhaust systems, the CFIS and ERV systems showed better ventilation air distribution and lower concentrations of particulates, formaldehyde and other VOCs. System improvement percentages were estimated based on four System Factor Categories: Balance, Distribution, Outside Air Source, and Recirculation Filtration. Recommended System Factors could be applied to reduce ventilation fan airflow rates relative to ASHRAE Standard 62.2 to save energy and reduce moisture control risk in humid climates. HVAC energy savings were predicted to be 8-10%, or $50-$75/year. Cumulative particle counts for six particle sizes, and formaldehyde and other Top 20 VOC concentrations were measured in multiple zones. The testing showed that single-point exhaust ventilation was inferior as a whole-house ventilation strategy.
Author: Charles Nehme
Publisher: Charles Nehme
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 42
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Book Description
Ventilation is an indispensable aspect of our built environment, yet it often operates quietly in the background, unseen and unheard. It is the invisible force that breathes life into our homes, workplaces, and public spaces, influencing our health, comfort, and overall well-being. The quality of the air we breathe indoors profoundly affects our lives, from our ability to concentrate and be productive to our susceptibility to illnesses and allergies. This book delves into the world of ventilation, unveiling its significance, principles, and applications across diverse settings. Whether you are a homeowner seeking to enhance indoor air quality, an architect striving to create sustainable buildings, or an engineer working on cutting-edge ventilation technologies, this book is a comprehensive guide to understanding, implementing, and optimizing ventilation systems. Ventilation is not a static field; it evolves in response to advancing technologies, changing environmental concerns, and the pursuit of healthier, more efficient indoor environments. In each chapter, we explore different facets of ventilation, from its role in mitigating the spread of respiratory diseases like COVID-19 to its pivotal role in green building practices aimed at reducing our carbon footprint. As we navigate the intricate world of ventilation, we emphasize best practices, emerging trends, and innovative solutions that are shaping the future of indoor environments. Whether you are seeking practical advice for improving ventilation in your home, insights into sustainable building design, or a glimpse into the technologies that will revolutionize the field, this book equips you with the knowledge to make informed decisions and contribute to creating spaces that prioritize health, comfort, and environmental responsibility. In our exploration of ventilation, we aim to illuminate the importance of this often-overlooked aspect of our daily lives. By understanding its principles and embracing best practices, we can breathe easier, work more productively, and live healthier lives in the spaces we call home, work, and play. We invite you to embark on this journey through the world of ventilation, and we hope you find the insights and knowledge within these pages both enlightening and empowering. Sincerely, Charles nehme
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
Effective residential envelope air sealing reduces infiltration and associated energy costs for thermal conditioning, yet often creates a need for mechanical ventilation to protect indoor air quality. This study estimated the potential energy savings of implementing airtightness improvements or absolute standards along with mechanical ventilation throughout the U.S. housing stock. We used a physics-based modeling framework to simulate the impact of envelope tightening, providing mechanical ventilation as needed. There are 113 million homes in the US. We calculated the change in energy demand for each home in a nationally representative sample of 50,000 virtual homes developed from the 2009 Residential Energy Consumption Survey. Ventilation was provided as required by 2010 and proposed 2013 versions of ASHRAE Standard 62.2. Ensuring that all current homes comply with 62.2-2010 would increase residential site energy demand by 0.07 quads (0.07 exajoules (EJ)) annually. Improving airtightness of all homes at current average retrofit performance levels would decrease demand by 0.7 quads (0.74 EJ) annually and upgrading all homes to be as airtight as the top 10% of similar homes would double the savings, leading to roughly $22 billion in annual savings in energy bills. We also analyzed the potential benefits of bringing the entire stock to airtightness specifications of IECC 2012, Canada's R2000, and Passive House standards.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The DOE Building America program has been conducting research leading to cost effective high performance homes since the early 1990's. Optimizing whole house mechanical ventilation as part of the program's systems engineered approach to constructing housing has been an important subject of the program's research. Ventilation in residential buildings is one component of an effective, comprehensive strategy for creation and maintenance of a comfortable and healthy indoor air environment. The study described in this white paper is based on building energy modeling with an important focus on the indoor humidity impacts of ventilation. The modeling tools used were EnergyPlus version 7.1 (E+) and EnergyGauge USA (EGUSA). Twelve U.S. cities and five climate zones were represented. A total of 864 simulations (2*2*3*3*12= 864) were run using two building archetypes, two building leakage rates, two building orientations, three ventilation systems, three ventilation rates, and twelve climates.
Author: Heinz R. Trechsel
Publisher: ASTM International
ISBN: 0803104693
Category : Buildings
Languages : en
Pages : 445
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Book Description
