ASHRAE/IESNA Standard 90.1 1999

PURPOSEThe purpose of this standard is to provide minimumrequirements for the energy-efficient design of buildingsexcept low-rise residential buildings.2. SCOPE2.1 This standard provides(a) minimum energy-efficient requirements for the designand construction of1. new buildings and their systems,2. new portions of buildings and their systems, and3. new systems and equipment in existing buildingsand(b) criteria for determining compliance with theserequirements.2.2 The provisions of this standard apply to(a) the envelope of buildings, provided that the enclosedspaces are1. heated by a heating system whose output capacityis greater than or equal to 10 W/m2 or2. cooled by a cooling system whose sensible outputcapacity is greater than or equal to 15 W/m2,and(b) the following systems and equipment used in conjunctionwith buildings:1. heating, ventilating, and air conditioning,2. service water heating,3. electric power distribution and metering provisions,4. electric motors and belt drives, and5. lighting.2.3 The provisions of this standard do not apply to(a) single-family houses, multi-family structures of threestories 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 useenergy primarily to provide for industrial, manufacturing,or commercial processes.2.4 Where specifically noted in this standard, certain otherbuildings or elements of buildings shall be exempt.2.5 This standard shall not be used to circumvent any safety,health, or environmental requirements.