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Buildings & Construction

Indoor air quality

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Displaying 76 - 100 of 435

Simulation of controls for reducing aerosol exposure in educational spaces using FaTIMA

September 1, 2020
Author(s)
Lisa C. Ng, Dustin G. Poppendieck, Brian J. Polidoro, William S. Dols, Steven J. Emmerich, Andrew K. Persily
Results from FaTIMA are presented, which is a recently developed, web-based front end to the CONTAM simulation engine, ContamX. We will introduce the model capabilities, user inputs, and results generated. We will then present the use of the tool in

CONTAM User Guide and Program Documentation Version 3.4

August 3, 2020
Author(s)
William Stuart Dols, Brian Polidoro
This manual describes the computer program CONTAM version 3.4, developed by NIST. CONTAM is a multizone indoor air quality and ventilation analysis program designed to help determine airflows, contaminant concentrations, and occupant exposure in buildings

A Tool to Model the Fate and Transport of Indoor Microbiological Aerosols (FaTIMA)

June 1, 2020
Author(s)
William S. Dols, Brian J. Polidoro, Dustin G. Poppendieck, Steven J. Emmerich
The web-based tool Fate and Transport of Indoor Microbiological Aerosols (FaTIMA) allows for the determination of the indoor fate of microbiological aerosols associated with ventilation, filtration, deposition and inactivation mechanisms. FaTIMA provides a

Flammable Refrigerant Safety

April 22, 2020
Author(s)
Gregory Linteris, Peter Sunderland
Most refrigerants currently in use have relatively high Global Warming Potential (GWP). For example, the GWPs of R-134a and R-410a are 1300 and 2088. Leaks to the atmosphere are common – typically about 10% of the total charge annually. This has motivated

Simulation of indoor and outdoor air quality and health impacts following installation of energy-efficient retrofits in a multifamily housing unit

March 2, 2020
Author(s)
Lindsay Underhill, Chad W. Milando, Jonathan I. Levy, William Stuart Dols, Sharon K. Lee, M. Patricia Fabian
Efforts to reduce energy consumption and greenhouse gas emissions in the United States have led to widespread interest in energy-efficient retrofits in the residential sector. Weatherization retrofits, such as air sealing and insulation, lower residential

Chemical emission rates from cigarette butts into air

January 18, 2020
Author(s)
Mengyan Gong, Nicholas Daniels, Dustin G. Poppendieck
Globally, over five trillion cigarette butts are generated every year, resulting in potential environmental and human risks. However, little attention has been paid to airborne emission from cigarette butts. This study measured airborne emissions from

Measurement of Airborne Emissions from Extinguished Cigarettes: Final Report

December 16, 2019
Author(s)
Dustin G. Poppendieck
Three series of experiments were conducted in this study. First, studies were performed to the determine the relative distributions of the target chemicals in freshly smoked butts by analyzing six types of samples consisting of different parts of the butts

Moisture Transfer in Commercial Buildings due to the Air Leakage: A New Feature in the Online Airtightness Savings Calculator

December 9, 2019
Author(s)
Som Shrestha, Andre Desjarlais, Laverne Dalgleish, Lisa Ng, Diana Hun, Steven Emmerich, Gina Accawi
Air leakage through the building envelope is responsible for a large amount of energy use. The US Department of Energy Windows and Building Envelope Research and Development Roadmap for Emerging Technologies states that in 2010 infiltration was responsible

NIST Air Leakage Calculation Tools for Commercial Buildings

December 9, 2019
Author(s)
Lisa C. Ng, Shrestha Som, William S. Dols, Steven J. Emmerich
The Department of Energy (DOE) estimates that air leakage (or “infiltration”) through building envelopes accounted for 6 % of the total energy consumed by commercial buildings in 2010 (DOE 2014). Air barrier requirements are now included in ASHRAE

Estimating Interzonal Leakage in a Net-Zero Energy House

November 11, 2019
Author(s)
Lisa C. Ng, Lindsey Kinser, Steven J. Emmerich, Andrew K. Persily
The Net Zero Energy Residential Test Facility (NZERTF) was constructed at the National Institute of Standards and Technology (NIST) to support the development and adoption of cost-effective net zero energy designs and technologies. The 250 m2 two-story

Airflow and Indoor Air Quality Models of DOE Prototype Commercial Buildings

October 24, 2019
Author(s)
Lisa C. Ng, Amy Musser, Andrew K. Persily, Steven J. Emmerich
An previous report, NIST Technical Note 1734, Airflow and Indoor Air Quality Models of DOE Reference Commercial Buildings [1], detailed the CONTAM models of the 16 U. S. Department of Energy (DOE) reference commercial building models. DOE developed the

The Role of Carbon Dioxide in Ventilation and IAQ Evaluation: 40 years of AIVC

October 1, 2019
Author(s)
Andrew K. Persily, William S. Dols, Steven J. Emmerich, Lisa C. Ng
The purpose of this summary is to review Air Infiltration and Ventilation Centre activities, as reflected in its publications, related to indoor carbon dioxide over the 40 years that have transpired since its creation. These activities, like most

Estimating real-time infiltration for use in residential ventilation control

September 19, 2019
Author(s)
Lisa C. Ng, Stephen M. Zimmerman, Jeremy Good, Brian Toll, Steven J. Emmerich, Andrew K. Persily
Minimum outdoor air ventilation rates specified in standards such as ASHRAE Standard 62.2 are generally based on envelope airtightness, building floor area, geographical location, and number of occupants. ASHRAE Standard 62.2 allows for a constant

Estimating real-time infiltration for use in residential ventilation control

June 18, 2019
Author(s)
Lisa Ng, Stephen M. Zimmerman, Jeremy Good, Brian Tool, Steven Emmerich, Andrew Persily
Minimum outdoor air ventilation rates specified in standards such as ASHRAE Standard 62.2 are generally based on envelope airtightness, building floor area, geographical location, and number of occupants. To meet ventilation requirements in practice
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