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    ItemOpen Access
    Mid-continent basin - methane emissions reconciliation: facility level emissions
    (Colorado State University. Libraries, 2016-05-26) Zimmerle, Dan, author
    Summary of results methane emission reconciliation for facility-level emissions using several measurement techniques during a comprehensive measurement campaign in a mid-continent basin. Comparison of bottom up versus top down methodologies.
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    ItemOpen Access
    METEC controlled test protocol: continuous monitoring emission detection and quantification
    (Colorado State University. Libraries, 2020-09-22) Bell, Clay, author; Zimmerle, Daniel, author
    This testing will assess the performance of continuous monitoring (CM) systems which perform leak detection and quantification (LDAQ) under Single-Blind controlled release testing over a range of environmental conditions and emission rates. Testing will evaluate system-level performance measures including Probability of Detection and Detection Time. Additional metrics including accuracy and precision of localization and quantification estimates will be evaluated if applicable. Due to the dependence of methods on weather conditions, testing will require an extended period, typically months, with active emission and non-emissions periods to (1) allow each Experimental Design Point to operate for an extended duration, typically hours, and (2) assess performance across a wide range of meteorological conditions.
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    ItemOpen Access
    Quantifying proximity, confinement, and interventions in disease outbreaks: a decision support framework for air-transported pathogens
    (Colorado State University. Libraries, 2021-02-19) Bond, Tami C, author; Bosco-Lauth, Angela, author; Farmer, Delphine K., author; Francisco, Paul W., author; Pierce, Jeffrey R., author; Fedak, Kristen M., author; Ham, Jay M., author; Jathar, Shantanu H., author; VandeWoude, Sue, author; Environmental Science & Technology, publisher
    The inability to communicate how infectious diseases are transmitted in human environments has triggered avoidance of interactions during the COVID-19 pandemic. We define a metric, Effective ReBreathed Volume (ERBV), that encapsulates how infectious pathogens, including SARS-CoV-2, transport in air. ERBV separates environmental transport from other factors in the chain of infection, allowing quantitative comparisons among situations. Particle size affects transport, removal onto surfaces, and elimination by mitigation measures, so ERBV is presented for a range of exhaled particle diameters: 1, 10, and 100 μm. Pathogen transport depends on both proximity and confinement. If interpersonal distancing of 2 m is maintained, then confinement, not proximity, dominates rebreathing after 10–15 min in enclosed spaces for all but 100 μm particles. We analyze strategies to reduce this confinement effect. Ventilation and filtration reduce person-to-person transport of 1 μm particles (ERBV1) by 13–85% in residential and office situations. Deposition to surfaces competes with intentional removal for 10 and 100 μm particles, so the same interventions reduce ERBV10 by only 3–50%, and ERBV100 is unaffected. Prior knowledge of size-dependent ERBV would help identify transmission modes and effective interventions. This framework supports mitigation decisions in emerging situations, even before other infectious parameters are known.
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    ItemOpen Access
    Open-source high flow sampler for natural gas leak quantification
    (Colorado State University. Libraries, 2022-04-14) Zimmerle, Daniel, author; Vaughn, Timothy, author; Bennett, Kristine, author; Ross, Cody, author; Harrison, Matthew, author; Wilson, Aaron, author; Johnson, Chris, author
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    ItemOpen Access
    METEC controlled test protocol: survey emission detection and quantification
    (Colorado State University. Libraries, 2022-04-26) Bell, Clay, author; Zimmerle, Daniel, author
    This testing will assess the performance of survey methods which perform leak detection and quantification (LDAQ) under single-blind controlled release testing over a range of environmental conditions and emission rates. Testing will evaluate system-level performance measures including Probability of Detection and Detection Time. Additional metrics including accuracy and precision of localization and quantification estimates will be evaluated if applicable.
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    ItemOpen Access
    MAES study sheet guide
    (Colorado State University. Libraries, 2024-09-19) Mollel, Winrose, author; Mdigo, Jacob, author; Santos, Arthur, author; Vora, Prajay, author; Duggan, Jerry, author; Zimmerle, Daniel, author
    This document provides definitions and instructions for completing Mechanistic Air Emissions Simulator (MAES) Study Sheets, one of the key input files required for running MAES. MAES is an updated version of the Methane Emission Estimation Tool (MEET). For details on additional input files, curated emissions data, and activity data, please refer to the main MAES documentation. The content addresses terms found in each tab and includes examples where applicable. Note that this document does not cover equipment operating states; for that information, consult the MAES help documentation at MEET2/README.html, then select ”MEET Model Reference” from the left-side menu.