{"id":3631,"date":"2023-03-21T14:34:31","date_gmt":"2023-03-21T14:34:31","guid":{"rendered":"https:\/\/earthresinc.wpengine.com\/?p=3631"},"modified":"2024-08-12T11:43:11","modified_gmt":"2024-08-12T15:43:11","slug":"air-dispersion-modeling-with-aermod","status":"publish","type":"post","link":"https:\/\/www.earthres.com\/air-dispersion-modeling-with-aermod\/","title":{"rendered":"Air Dispersion Modeling with AERMOD"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3631\" class=\"elementor elementor-3631\" data-elementor-settings=\"{&quot;element_pack_global_tooltip_width&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;element_pack_global_tooltip_width_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;element_pack_global_tooltip_width_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;element_pack_global_tooltip_padding&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;element_pack_global_tooltip_padding_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;element_pack_global_tooltip_padding_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;element_pack_global_tooltip_border_radius&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;element_pack_global_tooltip_border_radius_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;element_pack_global_tooltip_border_radius_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true}}\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"elementor-section elementor-top-section elementor-element elementor-element-54647558 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"54647558\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2b6079df\" data-id=\"2b6079df\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-51bac61c elementor-widget elementor-widget-text-editor\" data-id=\"51bac61c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><\/p>\n<p><strong>The Project:<\/strong> Air Re-Entrainment Analysis<\/p>\n<p><\/p>\n<p><\/p>\n<p>\ud83d\udccdConfidential<\/p>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 41px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<h2 class=\"wp-block-heading\">The Challenge<\/h2>\n<p><\/p>\n<p><\/p>\n<h4 class=\"wp-block-heading\">Growth and Demand Requires More Emergency Power<\/h4>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 25px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<p>EARTHRES was contracted by a Medical Care Facility to conduct an air re-entrainment analysis for their facility. In order for the Facility\u2019s emergency power system to keep up with growth and demand, the Client proposed to install two (2) identical emergency generators in a new building with room for a third generator to be installed at a later date.<\/p>\n<p><\/p>\n<p><\/p>\n<p>An analysis was needed to evaluate the placement of air intakes and exhausts associated with the proposed generator plant and whether generator plant exhaust air may contribute to re-entrainment into fresh air intakes.<\/p>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 20px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<h4 class=\"wp-block-heading\">Impact to Sensitive Patient Populations<\/h4>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 25px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<p>While this analysis was not required to demonstrate environmental and\/or regulatory compliance, the Client wanted to address public or patient concerns considering the sensitive population associated with the Facility.<\/p>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 22px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<h2 class=\"wp-block-heading\">The Solution<\/h2>\n<p><\/p>\n<p><\/p>\n<h4 class=\"wp-block-heading\">Use Site-Specific Data with a Complete and Powerful, State-of-the Science AERMOD Air Dispersion Modeling Assessment<\/h4>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 22px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<p>EARTHRES performed air dispersion modeling using the U.S. EPA AERMOD Model (via Lakes Environmental AERMOD View\u2122 software) for the proposed generator installation project.&nbsp; This highly specific model requires site-specific parameters to be identified and entered into the model including the following:<\/p>\n<p><\/p>\n<p><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul><\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>source information (source type, stack dimensions, emission rates, etc.),<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<p><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>building information (dimensions and stack locations),<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<p><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>building downwash (aerodynamic turbulence induced by adjacent \/ nearby buildings),<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<p><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>local meteorological data, and<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<p><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>sensitive receptor information (locations of nearby schools, etc.).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 22px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<h4 class=\"wp-block-heading\">Comparison with Standards and Thresholds<\/h4>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 22px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<p>EARTHRES compared the AERMOD Model results (emission rates, concentrations, and associated plume geometry) to the National Ambient Air Quality Standards (NAAQS), Pennsylvania Ambient Air Quality Standards (PAAQS), and human olfactory detectable odor thresholds.&nbsp; Based on the AERMOD Model emission concentrations and proposed plant design, the re-entrainment of generator exhaust air from the proposed project into fresh air intakes had the potential to cause slight-to-moderate impacts to sensitive populations.<\/p>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 28px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<figure class=\"wp-block-image alignwide size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"847\" height=\"710\" class=\"wp-image-3636\" src=\"https:\/\/www.earthres.com\/wp-content\/uploads\/2023\/03\/AERMOD-OUTPUT-FIGURE_.png\" alt=\"\" srcset=\"https:\/\/www.earthres.com\/wp-content\/uploads\/2023\/03\/AERMOD-OUTPUT-FIGURE_.png 847w, https:\/\/www.earthres.com\/wp-content\/uploads\/2023\/03\/AERMOD-OUTPUT-FIGURE_-300x251.png 300w, https:\/\/www.earthres.com\/wp-content\/uploads\/2023\/03\/AERMOD-OUTPUT-FIGURE_-768x644.png 768w\" sizes=\"(max-width: 847px) 100vw, 847px\" \/><\/figure>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 28px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<h4 class=\"wp-block-heading\"><strong>Design to Control the Outcome and Keep the Patients Safe<\/strong><\/h4>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 19px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<p>Based on the results, EARTHRES recommended installing a control device (selective catalytic reduction (SCR), or other control device(s)), implementing operational controls (limit testing and maintenance to certain non-peak hours), and\/or considering other plant design modifications (increased stack height, placement of fresh air intakes upwind of the maximum concentrations observed, etc.) in order to reduce actual air quality impacts to sensitive populations.<\/p>\n<p><\/p>\n<p><\/p>\n<p>In order to reduce potential emissions and\/or nuisance odors, the Facility has since proposed adding oxidation catalysts to the emergency generators, as recommended by EARTHRES.<\/p>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-spacer\" style=\"height: 27px;\" aria-hidden=\"true\">&nbsp;<\/div>\n<p><\/p>\n<p><\/p>\n<h2 class=\"wp-block-heading\">The Results<\/h2>\n<p><\/p>\n<p><\/p>\n<p>Prevented detrimental effects to sensitive patient populations by reducing emissions and nuisance odors.<\/p>\n<p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>The Project: Air Re-Entrainment Analysis ????Confidential The Challenge Growth and Demand Requires More Emergency Power EARTHRES was contracted by a Medical Care Facility to conduct an air re-entrainment analysis for their facility. In order for the Facility\u2019s emergency power system to keep up with growth and demand, the Client proposed to install two (2) identical [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":3635,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[16],"tags":[26,31,33,19],"class_list":["post-3631","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-study","tag-environmental","tag-environmental-compliance-permitting","tag-innovation-sustainability","tag-solid-waste"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.9 (Yoast SEO v24.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Air Dispersion Modeling with AERMOD | EARTHRES | A Division of RESPEC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.earthres.com\/air-dispersion-modeling-with-aermod\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Air Dispersion Modeling with AERMOD\" \/>\n<meta property=\"og:description\" content=\"The Project: Air Re-Entrainment Analysis ????Confidential The Challenge Growth and Demand Requires More Emergency Power EARTHRES was contracted by a Medical Care Facility to conduct an air re-entrainment analysis for their facility. 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