Models for nearly every occasion: Part IV – Two-box decreasing emission models.
New two-box “well-mixed room” decreasing emission (DE) models are introduced for scenarios that involve local controls, such as some form of local exhaust or local exhaust with filtered return. In addition, these models allow for the recirculation of a filtered (or cleaned) portion of the general ro...
| Publicado en: | Journal of Occupational & Environmental Hygiene Vol. 14; no. 11; pp. 919 - 931 |
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| Autores principales: | , |
| Formato: | equations & formulas glossary pictorial tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Nov2017
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=125963648&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 125963648 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Nov2017 vid: 14 iid: 11 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 125963648 125963648 125963648 10.1080/15459624.2017.1339167 125963648 ppf: 919 ppct: 12 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Models for nearly every occasion: Part IV – Two-box decreasing emission models. aug: au: Ganser, Gary H. Hewett, Paul affil: Department of Mathematics, West Virginia University, Morgantown, West Virginia sug: subj: Air Pollution, Indoor Occupational Exposure Evaluation Structural Equation Modeling Occupational Safety Air Pollution Filtration ab: New two-box “well-mixed room” decreasing emission (DE) models are introduced for scenarios that involve local controls, such as some form of local exhaust or local exhaust with filtered return. In addition, these models allow for the recirculation of a filtered (or cleaned) portion of the general room ventilation. For each control device scenario, a steady state and transient near and far field model is presented. The transient equations predict the concentration at time t after the application of the substance. The steady state equations can be use to predict the steady, unvarying “average concentration per application” whenever there are continuous applications of a substance and sufficient time has elapsed. The steady state equations can also be used to calculate the TWA for a task (or a series of tasks) whenever the beginning and end concentrations for the task (or task series) are expected to be zero (or near zero). The transient equations should be used to predict TWA exposures whenever these criteria cannot be met, or it is necessary to predict short-term exposures or peak concentrations. A structured calibration procedure, based on a mass balance approach, is proposed for each model. Depending upon the model, one or more calibration measurements are collected. Rearranged versions of the steady state equations are used to calculate estimates of the mass applied during each application, the near field flowrate, and (depending upon the model) the various efficiencies (e.g., local exhaust capture efficiency and the recirculation filtration efficiency). The emission rate constant must be determined using either a published approximation algorithm or experimentally. pubtype: Academic Journal doctype: equations & formulas glossary pictorial tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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