ASHRAE-90.1-2022- - Page 024
Extracted Content
nonstandard part-load value (NPLV. IP ): a single-number part-load efficiency figure of merit calculated and referenced to conditions other than IPLV .IP conditions, for units that are not designed to operate at AHRI standard rating conditions.
nonswinging door: see door .
nontransient: occupancy of a dwelling unit or sleeping unit for more than 30 days.
nonweatherized space constrained single-package vertical unit: a single-package vertical air conditioner ( SPVAC ) or single-package vertical heat pump ( SPVHP ) that meets all of the following requirements:
a. Is for indoor use only b. Has rated cooling capacities no greater than 36,000 Btu/h c. Is a single-package unit requiring opening in an exterior wall or semiexterior wall with overall exterior
dimensions that requires or uses an existing sleeve that meets one of the following criteria:
- Has a width of less than 32 in. and height of less than 45 in.
- Fits inside an existing 1310 in. [2] opening d. Is commonly installed in site -built commercial buildings e. Is of a similar cooling capacity and, if a heat pump, similar heating capacity f. Draws outdoor air for heat exchange directly through an existing opening, used for both inlet and outlet, in the exterior wall or semiexterior wall g. Is restricted to applications where an existing air conditioner, heat pump, or gas/electric unit, installed
in an existing exterior wall or semiexterior wall opening, is to be replaced h. Bears a permanent “Replacement” marking, conspicuously placed and clearly indicating that its appli cation is limited to installations where an existing air conditioner or heat pump is to be replaced
north-oriented: facing within 67.5 degrees of true north in the northern hemisphere; facing within 67.5 degrees of true south in the southern hemisphere.
occupancy sensor: a device that detects the presence or absence of people within an area and causes lighting, equipment, or appliances to be regulated accordingly.
occupied-standby mode: when a zone is scheduled to be occupied, and an occupant sensor indicates no occupants are within the zone.
off-mode power consumption (PW,OFF): the power consumption when the unit is connected to its main power source but is neither providing cooling nor heating to the building it serves.
on-site electricity generation systems: systems located at the building site that generate electricity, including, but not limited to, generators, combined heat and power systems, fuel cells, and on-site renewable energy systems .
on-site renewable energy: energy from renewable resources harvested at the building site .
opaque: all areas in the building envelope, except fenestration and building service openings such as vents and grilles. (See building envelope and fenestration .)
optimum start controls: controls that are designed to automatically adjust the start time of an HVAC system each day with the intention of bringing the space to desired occupied temperature levels immediately before scheduled occupancy.
orientation: the direction an envelope element faces, i.e., the direction of a vector perpendicular to and pointing away from the surface outside of the element.
outdoor (outside) air: air that is outside the building envelope or is taken from outside the building that has not been previously circulated through the building .
overcurrent: any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault.
packaged terminal air conditioner (PTAC): a factory-selected wall sleeve and separate unencased combination of heating and cooling components, assemblies, or sections. It may include heating capability by hot water, steam, or electricity and is intended for mounting through the wall to serve a single room or zone.
packaged terminal heat pump (PTHP): a PTAC capable of using the refrigerating system in a reverse cycle or heat-pump mode to provide heat.
parking garage daylight transition zone: covered vehicle entrances and exits from buildings and parking structures not exceeding a depth of 66 ft inside the structure, or a depth as determined by ANSI/IES RP-8,
22 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)