{"id":9393,"date":"2020-12-22T19:36:50","date_gmt":"2020-12-22T19:36:50","guid":{"rendered":"https:\/\/insulation.org\/?page_id=9393"},"modified":"2021-07-27T14:44:06","modified_gmt":"2021-07-27T14:44:06","slug":"temperature-drop-calculator-for-air-ducts","status":"publish","type":"page","link":"https:\/\/insulation.org\/training-tools\/designguide\/simple-calculators\/temperature-drop-calculator-for-air-ducts\/","title":{"rendered":"Temperature Drop Calculator For Air Ducts"},"content":{"rendered":"<div id=\"pl-9393\"  class=\"panel-layout\" ><div id=\"pg-9393-0\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-9393-0-0\"  class=\"panel-grid-cell\" ><div id=\"panel-9393-0-0-0\" class=\"so-panel widget widget_sow-editor panel-first-child\" data-index=\"0\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<div class=\"field field-name-field-author field-type-text-long field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\"><\/div>\n<\/div>\n<\/div>\n<div class=\"field field-name-body field-type-text-with-summary field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\">\n<p>Calculates the Temperature Change of Air Flowing in a Duct (<em>Reference: 2009 ASHRAE HoF, Chapter 4, Equation 48, (pg 4.21)<\/em>)<\/p>\n<p class=\"lead\">This calculator estimates the temperature drop (or rise) of air flowing in a duct.<\/p>\n<div id=\"calcinstr\">\n<h4>INSTRUCTIONS<\/h4>\n<p><strong>(Input information may generally be be obtained from design documents or field measurements)<\/strong><\/p>\n<ul>\n<li>Line 1. Enter the temperature of the air entering the duct<\/li>\n<li>Line 2. Enter the ambient temperature (the average temperature of the air surrounding the duct)<\/li>\n<li>Line 3. Enter the flow rate of the air carried by the duct in cubic feet per minute<\/li>\n<li>Line 4. Enter the length of the duct run in feet<\/li>\n<li>Line 5. Enter the perimeter of the duct in inches<\/li>\n<li>Line 6. Enter the R-value of the selected duct insulation. Available R-values will vary depending on insulation products selected.<\/li>\n<\/ul>\n<p><strong>Note<\/strong>: NA = Insulation Size Not Available. Some sizes and thicknesses may not be commercially available.<\/p>\n<h4>ASSUMPTIONS<\/h4>\n<ul>\n<li>One dimensional, steady state heat transfer<\/li>\n<li>Specific heat of air assumed constant at 0.24 Btu\/(lbm\u00b7\u00b0F)<\/li>\n<li>U-factor of duct walls assumed constant<\/li>\n<li>Air film resistances (inner + outer) assumed constant at 0.85 h\u00b7ft2\u00b7\u00b0F\/Btu<\/li>\n<li>The impact of duct leakage is neglected<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\t\t<script>\n\t\t\tvar jq = jQuery.noConflict();\n\t\t<\/script>\n\n<script id=\"calc_template\" type=\"text\/x-jquery-tmpl\">\n\t<div id=\"result_table\" class=\"top\"> \n\t\t<table class=\"calc_table\">\n\t\t\t<tr><th class=\"calc_title\" colspan=\"2\">Results<\/th><\/tr>\n\t\t\t<tr>\n\t\t\t\t<th class=\"table_header\">{{if (results['ambient_temperature'] > results['operating_temperature'])}} \n    \t\t\t\t  Temperature Rise (&deg;F)\n    \t\t\t\t{{else}}\n    \t\t\t\t  Temperature Drop, (&deg;F)\n    \t\t\t\t{{\/if}} <\/th><td>${results['temp_drop'] }<\/td>\n\t\t\t<\/tr>\n\t\t\t<tr>\n\t\t\t\t<th class=\"table_header\">Leaving Air Temperature <span class=\"label\">(&deg;F)<\/span><\/th><td>${ results['air_temp'] }<\/td>\n\t\t\t<\/tr>\n\t\t<\/table>\n\t<\/div> \n<\/script>\n\n<script type=\"text\/javascript\">\n\tjq(document).ready(\n\t\tfunction() {\n\t\t\t\/\/ automatically update the \"#result\" field every time\n\t\t\tjq(\"input[name^=sum]\").keyup(function() {\n\t\t\t\tdo_calculation();\n\t\t\t});\n\t\t\tjq(\"select[name^=sum]\").change(function() {\n\t\t\t\tdo_calculation();\n\t\t\t});\n\t\t\tdo_calculation();\n\t\t}\n\t);\n<\/script>\n\n<style>\n\tbody,\n\ttable,\n\tinput,\n\tselect {\n\t\tfont-family: 'Lato', Helvetica Neue, Arial, sans-serif;\n\t\tcolor: #1e1e1e;\n\t\tfont-size: 15px;\n\t\tfont-weight: 400;\n\t\tline-height: 1.45;\n\t}\n\n\tinput {\n\t\tfont-size: 12px width: 80px;\n\t}\n\n\t.calc_table {\n\t\tpadding: 0;\n\t\tmargin: 0;\n\t\twidth: 95%;\n\t}\n\n\t.calc_table td {\n\t\tpadding: 2px;\n\t\ttext-align: center;\n\t}\n\n\t.calc_title {\n\t\tbackground-color: #CCC;\n\t\tfont-weight: bold;\n\t\ttext-align: center;\n\t\tvertical-align: middle !important;\n\t}\n\n\t.calc_table .left_cell {\n\t\ttext-align: left;\n\t}\n\n\t.calc_table .right_cell {\n\t\ttext-align: right;\n\t}\n\n\t.table_header {\n\t\tbackground: #EEE;\n\t\tfont-weight: bold;\n\t\tpadding: 4px;\n\t\ttext-align: center;\n\t\tvertical-align: top;\n\t}\n\n\t.label {\n\t\tfont-weight: normal;\n\t}\n\n\t.textinput {\n\t\ttext-align: right;\n\t}\n<\/style>\n\n<form class=\"top\">\n\t<table class=\"calc_table\" style=\"width:95%;\">\n\t\t<tr>\n\t\t\t<th class=\"calc_title\" colspan=\"2\">Input Information<\/th>\n\t\t<\/tr>\n\t\t<tr>\n\t\t\t<td class=\"left_cell\">1. Entering air temperature, &deg;F<\/td>\n\t\t\t<td class=\"right_cell\"><input type=\"text\" id=\"air_temperature\" name=\"sum\" value=\"120\" size=\"8\"><\/td>\n\t\t<\/tr>\n\t\t<tr>\n\t\t\t<td class=\"left_cell\">2. Ambient temperature, &deg;F<\/td>\n\t\t\t<td class=\"right_cell\"><input type=\"text\" id=\"ambient_temperature\" name=\"sum\" value=\"75\" size=\"8\"><\/td>\n\t\t<\/tr>\n\t\t<tr>\n\t\t\t<td class=\"left_cell\">3. Flow rate of air, cfm<\/td>\n\t\t\t<td class=\"right_cell\"><input type=\"text\" id=\"flow_rate\" name=\"sum\" value=\"500\" size=\"8\"><\/td>\n\t\t<\/tr>\n\t\t<tr>\n\t\t\t<td class=\"left_cell\">4. Length of run, ft<\/td>\n\t\t\t<td class=\"right_cell\"><input type=\"text\" id=\"run_length\" name=\"sum\" value=\"50\" size=\"8\"><\/td>\n\t\t<\/tr>\n\t\t<tr>\n\t\t\t<td class=\"left_cell\">5. Outside perimeter of duct, in<\/td>\n\t\t\t<td class=\"right_cell\"><input type=\"text\" id=\"duct_perimiter\" name=\"sum\" value=\"48\" size=\"8\"><\/td>\n\t\t<\/tr>\n\t\t<tr>\n\t\t\t<td class=\"left_cell\">6. R-value of duct insulation, (h ft&sup2; &deg;F)\/Btu<\/td>\n\t\t\t<td class=\"right_cell\"><input type=\"text\" id=\"r_value\" name=\"sum\" value=\"6\" size=\"8\"><\/td>\n\t\t<\/tr>\n\t<\/table>\n<\/form>\n<div id=\"error_msg\" style=\"display:none;\">\n\t<p style=\"color:red;\">One of the values is empty, not a number, or lower than zero.\n<\/div>\n<!-- calculated results_template table, from above, appears here -->\n<div id=\"result_table\"><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Calculates the Temperature Change of Air Flowing in a Duct (Reference: 2009 ASHRAE HoF, Chapter 4, Equation 48, (pg 4.21)) This calculator estimates the temperature drop (or rise) of air flowing in a duct. INSTRUCTIONS (Input information may generally be be obtained from design documents or field measurements) Line 1. Enter the temperature of the<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":9263,"menu_order":7,"comment_status":"closed","ping_status":"closed","template":"template-midg.php","meta":{"_acf_changed":false,"footnotes":""},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.9 (Yoast SEO v22.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Temperature Drop Calculator For Air Ducts - NIA<\/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:\/\/insulation.org\/training-tools\/designguide\/simple-calculators\/temperature-drop-calculator-for-air-ducts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Temperature Drop Calculator For Air Ducts\" \/>\n<meta property=\"og:description\" content=\"Calculates the Temperature Change of Air Flowing in a Duct (Reference: 2009 ASHRAE HoF, Chapter 4, Equation 48, (pg 4.21)) This calculator estimates the temperature drop (or rise) of air flowing in a duct. INSTRUCTIONS (Input information may generally be be obtained from design documents or field measurements) Line 1. 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