![]() ![]() Where exterior walls are used as plenum walls, wall insulation shall be as required by the most restrictive condition of this section or Section 8 of ASHRAE/IESNA 90.1-1989. For ducts which are designed to convey both heated and cooled air, duct insulation shall be as required by the Additional insulation, vapor retarders, or both, may be required to limit vapor transmission and condensation. The required minimum thicknesses do not consider water vapor transmission and condensation. (a) Insulation R-values shown are for the insulation as installed and do not include film resistance. Some states have their own energy codes and/or amendments to these codes which provide greater R-values. The table below shows these required minimum R-values related to duct insulation thickness.Īs required by the Energy Policy Act of 1992, each State must certify that its commercial building code energy provisions meet or exceed the requirements of this ASHRAE Standard. It provides minimum required thermal resistance (R) values for air ducts, plenums, and enclosures based on the temperature differential (TD) at design conditions between the space within which the duct is located and the design air temperature in the duct. This standard includes energy-efficient design requirements for HVAC systems and equipment intended to improve utilization of energy in buildings. ![]() This widely accepted National Voluntary Consensus Standard was developed under the auspices of ASHRAE, the American Society of Heating, Refrigerating, and Air-Conditioning Engineers it was co-sponsored by the Illuminating Engineering Society of North America. ASHRAE/IESNA 90.1-1989, Energy Efficient Design of New Buildings Except Low Rise Residential Buildings Insulation R-values required by these standards are given on the following four pages.Ī. Most State energy conservation codes are currently being updated to reflect DOE recognition of these more recent ASHRAE and ICC energy standards and to maintain compliance with the Federal Energy Policy Act. For energy conservation in residential construction, DOE now recognizes the ICC's International Energy Conservation Code (IECC), 2003 Edition. DOE is also currently reviewing another ASHRAE energy standard, ANSI/ASHRAE/IESNA 90.1 2001. In 2002, for commercial construction DOE updated the Federal Energy Policy Act to recognize a later version of the ASHRAE energy standard, ASHRAE/IESNA 90.1-1999. This act also required states' residential building energy codes to meet or exceed the energy conservation requirements of CABO's Model Energy Code.ĭOE conducts ongoing review of subsequent versions of these and other energy codes to determine whether these might be the basis for a better national energy policy. The Department of Energy's Federal Energy Policy Act of 1992 required states to certify that their commercial building energy codes meet or exceed the energy conservation requirements of ASHRAE/IESNA 90.1-1989, an energy standard promulgated by ASHRAE, the American Society of Heating, Refrigerating, and Air- Conditioning Engineers. ![]()
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