ASHRAE-90.1-2022- - Page 018
Extracted Content
enthalpy recovery ratio: change in the enthalpy of the outdoor air supply divided by the difference between the outdoor air and entering exhaust air enthalpy, expressed as a percentage.
entrance door: see vertical fenestration.
equipment: devices for space heating, space cooling, ventilation, humidification, dehumidification, electric power, lighting, transportation, refrigeration, cooking, or service water heating, including (but not limited to) furnaces, boilers, air conditioners, heat pumps, chillers, water heaters, lamps, luminaires, ballasts, elevators, escalators, or other devices or installations.
essential facility: those portions of a building serving one of the following functions:
a. Hospitals and other health care facilities having surgery or emergency treatment facilities b. Fire, rescue, and police stations and emergency vehicle garages c. Designated earthquake, hurricane, or other emergency shelters d. Designated emergency preparedness, communication, and operation centers and other facilities
required for emergency response e. Power-generating stations and other public utility facilities required as emergency backup facilities for
other essential facilities f. Structures containing highly toxic materials where the quantity of the material exceeds the maximum allowable quantities g. Aviation control towers, air traffic control centers, and emergency aircraft hangars h. Buildings and other structures having critical national defense functions
evaporation design wet-bulb temperature: the outdoor wet-bulb temperature used in conjunction with the mean coincident dry-bulb temperature, often used for the sizing of evaporative systems such as cooling towers.
existing building: a building or portion thereof that was previously occupied or approved for occupancy by the authority having jurisdiction .
existing equipment: equipment previously installed in an existing building or on an existing site.
existing site: a site or portion thereof that was previously approved by the authority having jurisdiction .
existing system: a system or systems previously installed in an existing building or on an existing site .
exterior building envelope: see building envelope .
exterior lighting power allowance: see lighting power allowance, exterior .
exterior wall: see building envelope and wall .
eye adaptation: the process by which the retina becomes accustomed to more or less light than it was exposed to during an immediately preceding period. It results in a change in the sensitivity to light.
F-factor: the perimeter heat loss factor for slab-on-grade floors (Btu/h·ft·°F).
facade area: area of the facade, including overhanging soffits, cornices, and protruding columns, measured in elevation in a vertical plane parallel to the plane of the face of the building . Nonhorizontal roof surfaces shall be included in the calculation of vertical facade area by measuring the area in a plane parallel to the surface.
fan array: multiple fans in parallel between two plenum sections in an air distribution system .
fan brake horsepower (bhp): the horsepower delivered to the fan’s shaft. Brake horsepower does not include the mechanical drive losses (belts, gears, etc.).
fan, embedded: a fan that is part of a manufactured assembly where the assembly includes functions other than air movement.
fan energy index (FEI): the ratio of the electric input power of a reference fan to the electric input power of the actual fan as calculated per AMCA 208.
fan nameplate electrical input power: the nominal electrical input power rating stamped on a fan assembly nameplate.
fan system brake horsepower (bhp): the sum of the fan brake horsepower of all fans that are required to operate at fan system design conditions to supply air from the heating or cooling source to the conditioned spaces and return it to the source or exhaust it to the outdoors.
fan system design conditions: operating conditions that can be expected to occur during normal system operation that result in the highest supply airflow rate to conditioned spaces served by the system, other than during air economizer operation.
16 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)