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Standard 90.1 Document History

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ANSI/ASHRAE/IES Standard 90.1-2016

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ANSI/ASHRAE/IES Standard 90.1-2013

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Here's what's new in the 2013 edition:

  • Revised, stricter opaque element and fenestration requirements at a reasonable level of cost-effectiveness
  • Improvements to daylighting controls, space-by-space lighting power density limits, and thresholds for toplighting
  • Revised equipment efficiencies for heat pumps, packaged terminal air conditioners (PTACs), single package vertical heat pumps and air conditioners (SPVHP and SPVAC), and evaporative condensers
  • New provisions for commercial refrigeration equipment and improved controls for heat rejection and boiler equipment
  • Improved requirements for expanded use of energy recovery, small-motor efficiencies, and fan power control and credits
  • Improved equipment efficiencies for chillers
  • Clarifications for the use of prescriptive provisions when performing building energy use modeling, and revisions to enhance capturing daylighting when performing modeling calculations
  • A new alternate compliance path to Section 6, "Heating, Ventilating, and Air-Conditioning," for computer room systems, developed with ASHRAE Technical Committee (TC) 9.9.

In addition to offering immediate access to the content, the PDF download of this standard presents selected graphics in color for enhanced readability.

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ANSI/ASHRAE/IES Standard 90.1-2010

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90.1-2010 User's Manual

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This User's Manual provides detailed instruction for the design of commercial and high-rise residential buildings to ensure their compliance with ANSI/ASHRAE/IES Standard 90.1-2010.

This Manual:

  • Offers information on the intent and application of Standard 90.1
  • Illuminates the Standard through the use of abundant sample calculations and examples.
  • Streamlines the process of showing compliance.
  • Provides forms to demonstrate compliance.

Instructs the user in the application of:

  • Energy simulation programs used in conjunction with the Energy Cost Budget method of compliance with the Standard.
  • The Performance Rating method used for calculating building energy performance ratings for certain building rating systems and incentive programs.

Intended to be useful to numerous types of building professionals, including:

  • Architects and engineers who must apply the Standard to the design of their buildings.
  • Plan examiners and field inspectors who must enforce the Standard in areas where it is adopted as code.
  • General and specialty contractors who must construct buildings in compliance with the Standard.
  • Product manufacturers, state and local energy offices, policy groups, utilities and others.

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ANSI/ASHRAE/IESNA Standard 90.1-2007

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This 2007 edition of the standard has several new features and includes changes resulting from the continuous maintenance proposals from the public, including all of the Addenda to Standard 90.1-2004.

The purpose of this standard is to provide minimum requirements for the energy-efficient design of buildings except low-rise residential buildings. This standard provides (a) minimum energy-efficient requirements for the design and construction of 1) new buildings and their systems, 2) new portions of buildings and their systems, and 3) new systems and equipment in existing buildings and (b) criteria for determining compliance with these requirements.

The provisions of this standard apply to the envelopes of buildings, provided that the enclosed spaces are 1) heated by a heating system whose output capacity is greater than or equal to 3.4 Btu/h•ft2 or 2) cooled by a cooling system whose sensible output capacity is greater than or equal to 5 Btu/h•ft2. The provisions also apply to the following systems and equipment used in conjunction with buildings: 1) heating, ventilating, and air conditioning, 2) service water heating, 3) electric power distribution and metering provisions, 4) electric motors and belt drives, and 5) lighting.

The provisions of this standard do not apply to (a) single-family houses, multi-family structures of three stories or fewer above grade, manufactured houses (mobile homes) and manufactured houses (modular), (b) buildings that do not use either electricity or fossil fuel, or (c) equipment and portions of building systems that use energy primarily to provide for industrial, manufacturing, or commercial processes. Where specifically noted in this standard, certain other buildings or elements of buildings shall be exempt. This standard shall not be used to circumvent any safety, health, or environmental requirements.

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Standard 90.1-2007 User's Manual

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This User's Manual provides detailed instruction for the design of commercial and high-rise residential buildings to ensure their compliance with ANSI/ASHRAE/IESNA Standard 90.1-2007. In addition, this Manual encourages the user to apply the principles of effective energy-conserving design when designing buildings and building systems; offers information on the intent and application of Standard 90.1; illuminates the Standard through the use of abundant sample calculations and examples; streamlines the process of showing compliance; provides Standard forms to demonstrate compliance; provides useful reference material to assist designers in efficiently completing a successful and complying design.

This Manual also instructs the user in the application of several tools used for compliance with Standard 90.1: the EnvStd computer program used in conjunction with the Building Envelope Trade-Off compliance method and the selection and application of energy simulation programs used in conjunction with the energy cost budget method of compliance.

EnvStd 6.0, applicable DOE2 files, and form-field PDFs of compliance forms (ready for the user to use in the field) are included on a CD that comes with the printed Manual.

This Manual is intended to be useful to numerous types of building professionals, including: architects and engineers who must apply the Standard to the design of their buildings; plan examiners and field inspectors who must enforce the Standard in areas where it is adopted as code; general and specialty contractors who must construct buildings in compliance with the standard; product manufacturers, state and local energy offices, policy groups, utilities, and others.

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ANSI/ASHRAE Standard 90.1-2004

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The version of the standard provided in this preview includes all addenda that were approved by the Board of Directors as of January 1, 2005. It does not include any addenda, interpretations, or errata approved after this date. The standard you purchase will include the most up-to-date additions.

This 2004 edition, which supersedes Standard 90.1-2001 (I-P), has several new features and includes changes resulting from the continuous maintenance proposals from the public. The standard has been completely reformatted for ease of use and clarity. The climate zones have been reduced from 26 to 8 and the Lighting LPDs have been reduced as well.

The purpose of this standard is to provide minimum requirements for the energy-efficient design of buildings except low-rise residential buildings.

This standard provides (a) minimum energy-efficient requirements for the design and construction of 1. new buildings and their systems, 2. new portions of buildings and their systems, and 3. new systems and equipment in existing buildings and (b) criteria for determining compliance with these requirements.

The provisions of this standard apply to the envelope of buildings, provided that the enclosed spaces are 1. heated by a heating system whose output capacity is greater than or equal to 3.4 Btu/h•ft2 or 2. cooled by a cooling system whose sensible output capacity is greater than or equal to 5 Btu/h•ft2. The provisions also apply to the following systems and equipment used in conjunction with buildings: 1. heating, ventilating, and air conditioning, 2. service water heating, 3. electric power distribution and metering provisions, 4. electric motors and belt drives, and 5. lighting.

The provisions of this standard do not apply to (a) single-family houses, multi-family structures of three stories or fewer above grade, manufactured houses (mobile homes) and manufactured houses (modular), (b) buildings that do not use either electricity or fossil fuel, or (c) equipment and portions of building systems that use energy primarily to provide for industrial, manufacturing, or commercial processes. Where specifically noted in this standard, certain other buildings or elements of buildings shall be exempt. This standard shall not be used to circumvent any safety, health, or environmental requirements.

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