{"id":6887,"date":"2013-09-01T00:00:00","date_gmt":"2013-09-01T00:00:00","guid":{"rendered":"https:\/\/insulation.org\/io\/articles\/mechanical-insulation-simple-calculators-a-guide-to-the-temperature-drop-for-air-in-an-insulated-duct-or-fluid-in-an-insulated-pipe-calculators\/"},"modified":"2017-06-09T20:25:50","modified_gmt":"2017-06-09T20:25:50","slug":"mechanical-insulation-simple-calculators-a-guide-to-the-temperature-drop-for-air-in-an-insulated-duct-or-fluid-in-an-insulated-pipe-calculators","status":"publish","type":"articles","link":"https:\/\/insulation.org\/io\/articles\/mechanical-insulation-simple-calculators-a-guide-to-the-temperature-drop-for-air-in-an-insulated-duct-or-fluid-in-an-insulated-pipe-calculators\/","title":{"rendered":"Mechanical Insulation Simple Calculators: A Guide to the Temperature Drop for Air in an Insulated Duct or Fluid in an Insulated Pipe Calculators"},"content":{"rendered":"<p MsoNormal ':justify;:120%;:\nnone;:middle'>This article continues our series featuring the<br \/>\n?Simple Calculators? from the Mechanical Insulation Design Guide (MIDG). The<br \/>\ncalculators are part of the Mechanical Insulation Education &amp; Awareness<br \/>\nCampaign (MIC), which was started by the Department of Energy&#8217;s (DOE&#8217;s)<br \/>\nAdvanced Manufacturing Office to improve the energy efficiency of the <span\n':-.35pt'>U.S. industrial and commercial sectors. The<br \/>\nNational Insulation<\/span> Association (NIA) and its Alliance partners<br \/>\ncollaborated with the DOE to design, implement, and execute the MIC.<\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'>The MIC seeks to increase<br \/>\nawareness of the energy efficiency, emission reduction, economic stimulus<br \/>\npotential, and other benefits of mechanical insulation. An integral component<br \/>\nof the MIC was the development of the Simple Calculators. The calculators,<br \/>\nlisted on the left, provide users with instantaneous information on a variety<br \/>\nof mechanical insulation applications in the industrial\/manufacturing and<br \/>\ncommercial markets. <\/p>\n<p><UL><\/p>\n<p MsoListParagraphCxSpFirst ':26.1pt;:justify;\n:-.25in;:120%;:none;:middle'><LI>Condensation Control&mdash;Horizontal Piping<\/p>\n<p MsoListParagraphCxSpMiddle ':26.1pt;:-.25in;\n:120%;:none;:middle'><LI>Energy Loss, Emission Reduction, Surface<br \/>\nTemperature, and Annual Return<\/p>\n<p MsoListParagraphCxSpMiddle ':26.1pt;:justify;\n:-.25in;:120%;:none;:middle'><LI>Financial Returns<\/p>\n<p MsoListParagraphCxSpMiddle ':26.1pt;:justify;\n:-.25in;:120%;:none;:middle'><LI>Estimate Time to Freezing for Water<br \/>\nin an Insulated Pipe<\/span> <\/p>\n<p MsoListParagraphCxSpMiddle ':26.1pt;:justify;\n:-.25in;:120%;:none;:middle'><LI>Personnel Protection for Horizontal Piping<\/p>\n<p MsoListParagraphCxSpLast ':26.1pt;:justify;\n:-.25in;:120%;:none;:middle'><LI>Temperature Drop for Air in an Insulated Duct or Fluid in an Insulated<br \/>\nPipe<\/p>\n<p><\/UL><\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'>The calculators are online as<br \/>\npart of the National Institute of Building Sciences&#8217; MIDG, <a href=\"http:\/\/www.wbdg.org\/midg\" target=\"_blank\"><i>www.wbdg.org\/midg<\/i><\/a>.<br \/>\nYou can also access them through a link on NIA&#8217;s website: <i>www.insulation.org<\/i>.<br \/>\nThe calculators are fast, free, and functional tools that make it easy to<br \/>\ndiscover energy savings, financial returns, and other information for the<br \/>\ndesign of mechanical insulation systems for above- or below-ambient applications. <\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'>Insulation systems are often<br \/>\ndesigned to minimize variation of temperatures in processes. This article will<br \/>\nprovide an overview and guide to use the Temperature Drop for Air in an<br \/>\nInsulated Duct or Fluid in an Insulated Pipe Calculators. <\/p>\n<p MsoNormal 'margin-top:13.5pt;:13.0pt;:\nnone;:middle'><b><font color=\"#0000FF\">Temperature Drop Calculator for Air Ducts<\/font><\/b><\/p>\n<p MsoNormal ':justify;:120%;:\nnone;:middle'>This calculator estimates the temperature drop (or<br \/>\nrise) of air flowing in a duct (Reference: 2009 ASHRAE HoF, Chapter 4, Equation<br \/>\n48, page 4.21). The calculator requires data for 6 input variables. Results are<br \/>\nupdated as each input variable is entered. Input information may generally be<br \/>\nobtained from design documents or field measurements. The impact of duct leakage<br \/>\nis not taken into consideration. <\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'>Following are the instructions<br \/>\nand additional information for each input variable. Note that the default<br \/>\nvalues for each input are highlighted in a box after each prompt. <\/p>\n<p><UL><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 1.<br \/>\nEnter the temperature of the air entering the duct, \u00b0F: 120<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><span\n':-.2pt'>The default value is 120\u00b0F; however, you should<br \/>\nenter the actual initial temperature in degrees Fahrenheit for the air entering<br \/>\nthe duct.<\/span><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 2.<br \/>\nEnter the ambient temperature (the average temperature of the air surrounding<br \/>\nthe duct), \u00b0F: 75<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 75\u00b0F; however, you should enter the average ambient temperature in<br \/>\ndegrees Fahrenheit for the area surrounding the duct. <\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 3.<br \/>\nEnter the flow rate of the air carried by the duct in cubic feet per minute<br \/>\n(cfm): 500<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue shown is 500 cfm; however, you should enter the expected\/designed flow<br \/>\nrate.<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 4.<br \/>\nEnter the length of the duct run in feet: 50<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 50 feet; however, you should enter the actual length of the duct run<br \/>\nin question.<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 5.<br \/>\nEnter the perimeter of the duct in inches: 48 <\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 48 inches; however, you should enter the perimeter of the duct in<br \/>\nquestion.<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 6.<br \/>\nEnter the R-value of the selected duct insulation, ft: 6<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>Enter the<br \/>\nR-value of the selected duct insulation. Available R-values will vary,<br \/>\ndepending on the insulation products selected. If it is not known, it is<br \/>\nsuggested you consult the respective manufacturer data sheet.<\/p>\n<p><\/UL><\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'>Based upon the information<br \/>\nvariables provided, the Results section displays the temperature drop (\u00b0F) and<br \/>\nthe temperature of the air leaving the duct. In this example, the results were<br \/>\n2.4\u00b0F and 117.6\u00b0F, respectively. <\/p>\n<p MsoNormal 'margin-top:13.5pt;:13.0pt;:\nnone;:middle'><b><font color=\"#0000FF\">Temperature Drop Calculator for Hydronic Piping<\/font><\/b><\/p>\n<p MsoNormal ':justify;:120%;:\nnone;:middle'>This calculator estimates the temperature drop (or<br \/>\nrise) of water flowing in a pipe. The calculator requires data for 9 input<br \/>\nvariables. Results are updated as each input variable is entered. Input<br \/>\ninformation may generally be obtained from design documents or field<br \/>\nmeasurements. <\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'>Following are the instructions<br \/>\nand additional information for each input variable. Again, default values<br \/>\nappear in bold, underlined text after each prompt. <\/p>\n<p><UL><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 1.<br \/>\nEnter the temperature of the water entering the pipe, \u00b0F: 35<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 35\u00b0F; however, you should enter the actual temperature for the water<br \/>\nentering the pipe (in degrees Fahrenheit).<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 2.<br \/>\nEnter the ambient air temperature (the temperature of the air surrounding the<br \/>\npipe), \u00b0F: 75<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 75\u00b0F; however, you should enter the average ambient temperature,<br \/>\n(temperature in degrees Fahrenheit for the area surrounding the pipe).<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 3.<br \/>\nEnter the wind speed of the ambient air in miles per hour (mph): 15<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 15 mph. You should enter expected wind speed. If unknown, it is<br \/>\nsuggested you use 1 mph for indoor and 8 mph for outdoor applications.<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 4.<br \/>\nEnter the flow rate of the water carried by the pipe in gallons per minute<br \/>\n(gpm): 40<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><\/b><i>Note:<br \/>\nThe calculator does not screen for reasonable flow velocities; hydronic piping<br \/>\nis normally sized for flow velocities between 5 and 12 feet\/second. <\/i><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 40; however, you should enter the expected or designed flow rate in<br \/>\ngpm. <\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 5.<br \/>\nEnter the length of the piping run in feet: 100<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is 100 feet; however, you should enter the actual length of the pipe run<br \/>\nin question.<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 6.<br \/>\nSelect the nominal pipe size (NPS) in inches: 2<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nvalue is an NPS of 2 inches; however, by using the drop-down box you can select<br \/>\nany pipe size from \u00bd inch to 24 inches.<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 7.<br \/>\nSelect the nominal thickness of insulation in inches: 1<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'>The default<br \/>\nthickness is 1 inch; however, you should use the drop-down box to select the<br \/>\ndesired thickness, from 0 to 4 inches (in half- or quarter-inch increments).<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 8.<br \/>\nSelect an insulation material: Fiberglass<br \/>\n(to 850\u00b0F)<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><i>Note: The<br \/>\ncalculator does not screen for material temperature limitations. <\/i><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><i><\/i>The<br \/>\ndefault box indicates fiberglass; however, you may use the drop-down box to<br \/>\nselect 1 of 8 insulation materials: Calcium Silicate, Cellular Glass,<br \/>\nElastomeric, Fiberglass, Mineral Wool, Polyethylene, Polyisocyanurate, or<br \/>\nPolystyrene.<\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><b><LI><font color=\"#0000FF\">Line 9.<br \/>\nSelect thermal emittance of the outer jacket material: 0.10 &#8211; Aluminium,<br \/>\noxidized, in service<\/font><\/b><\/p>\n<p MsoNormal ':.3in;:justify;:-13.5pt;\n:120%;:none;:middle'><span\n':-.1pt'>The default box indicates in service oxidized<br \/>\naluminium;<\/span> however, you may use the drop-down box to select 1 of 11<br \/>\nexterior surfaces. For a detailed discussion and definition of emittance,<br \/>\nplease refer to the MIDG.<span ':.2pt'>\u00a0 <\/span><\/p>\n<p><\/UL><\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'>Based upon the information<br \/>\nvariables provided, the Results section displays the temperature rise (\u00b0F) and<br \/>\nthe temperature of the water leaving the pipe. In this example, the results<br \/>\nwere 0.0\u00b0F and 35.0\u00b0F, respectively. <\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'><span ':\n-.1pt'>While the Simple Calculators may not address every insulation material<br \/>\nor application, they are an extremely valuable, easy-to-use tool that can<br \/>\nprovide users with online, snapshot information on some the most frequently<br \/>\nasked-about benefits and design considerations of mechanical insulation<br \/>\nsystems. <\/span><\/p>\n<p MsoNormal ':justify;:13.5pt;:\n120%;:none;:middle'><span ':\n-.1pt'>For both the novice and seasoned user, the MIDG&mdash;located at <a href=\"http:\/\/www.wbdg.org\/midg\" target=\"_blank\"><i>www.wbdg.org\/midg<\/i><\/a>&mdash;is<br \/>\nan excellent resource for basic insulation information and tools for designing<br \/>\na complex insulation system. The MIDG is comprehensive and contains information<br \/>\non every step of a project: from design, to selection, specification,<br \/>\ninstallation, and maintenance of mechanical insulation. The MIDG website is<br \/>\nregularly updated to bring users the most current and complete<br \/>\ninformation&mdash;including the convenient Simple Calculators,<br \/>\ndesigned to make the most common mechanical insulation calculations simple and<br \/>\naccessible to users of all levels. For further information<br \/>\non this topic and the calculator please refer to the MIDG, Design Objectives&mdash;Process<br \/>\nControl section.<\/span><\/p>\n<div id=\"images\">\n<div class=\"figure\"><a href=\"https:\/\/insulation.org\/wp-content\/uploads\/2017\/06\/IO130903_01.jpg\"><img decoding=\"async\" src=\"https:\/\/insulation.org\/wp-content\/uploads\/2017\/06\/IO130903_01.jpg\"\/><\/a><b>Figure 1<\/b><\/div>\n<div class=\"figure\"><a href=\"https:\/\/insulation.org\/wp-content\/uploads\/2017\/06\/IO130903_02.jpg\"><img decoding=\"async\" src=\"https:\/\/insulation.org\/wp-content\/uploads\/2017\/06\/IO130903_02.jpg\"\/><\/a><b>Figure 2<\/b><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This article continues our series featuring the ?Simple Calculators? from the Mechanical Insulation Design Guide (MIDG). The calculators are part of the Mechanical Insulation Education &amp; Awareness Campaign (MIC), which was started by the Department of Energy&#8217;s (DOE&#8217;s) Advanced Manufacturing Office to improve the energy efficiency of the U.S. industrial and commercial sectors. The National<\/p>\n","protected":false},"author":[308],"featured_media":0,"template":"","categories":[38,298,43,41,24,301,21,297,299,288,29,28],"class_list":["post-6887","articles","type-articles","status-publish","hentry","category-material-selection","category-installation","category-technology","category-process-control","category-contracting","category-design","category-business-managment","category-basic-understanding","category-foundation","category-fabrication","category-environmental-control","category-energy-savings","author-ronald-l-king"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.0 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mechanical Insulation Simple Calculators: A Guide to the Temperature Drop for Air in an Insulated Duct or Fluid in an Insulated Pipe Calculators - Insulation Outlook Magazine<\/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\/io\/articles\/mechanical-insulation-simple-calculators-a-guide-to-the-temperature-drop-for-air-in-an-insulated-duct-or-fluid-in-an-insulated-pipe-calculators\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mechanical Insulation Simple Calculators: A Guide to the Temperature Drop for Air in an Insulated Duct or Fluid in an Insulated Pipe Calculators\" \/>\n<meta property=\"og:description\" content=\"This article continues our series featuring the ?Simple Calculators? from the Mechanical Insulation Design Guide (MIDG). 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The calculators are part of the Mechanical Insulation Education &amp; Awareness Campaign (MIC), which was started by the Department of Energy&#8217;s (DOE&#8217;s) Advanced Manufacturing Office to improve the energy efficiency of the U.S. industrial and commercial sectors. The National","og_url":"https:\/\/insulation.org\/io\/articles\/mechanical-insulation-simple-calculators-a-guide-to-the-temperature-drop-for-air-in-an-insulated-duct-or-fluid-in-an-insulated-pipe-calculators\/","og_site_name":"Insulation Outlook Magazine","article_modified_time":"2017-06-09T20:25:50+00:00","og_image":[{"url":"https:\/\/insulation.org\/wp-content\/uploads\/2017\/06\/IO130903_01.jpg","type":"","width":"","height":""}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/insulation.org\/io\/articles\/mechanical-insulation-simple-calculators-a-guide-to-the-temperature-drop-for-air-in-an-insulated-duct-or-fluid-in-an-insulated-pipe-calculators\/","url":"https:\/\/insulation.org\/io\/articles\/mechanical-insulation-simple-calculators-a-guide-to-the-temperature-drop-for-air-in-an-insulated-duct-or-fluid-in-an-insulated-pipe-calculators\/","name":"Mechanical Insulation Simple Calculators: A Guide to the Temperature Drop for Air in an Insulated Duct or Fluid in an Insulated Pipe Calculators - 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