ASHRAE-90.1-2022- - Page 007
Extracted Content
baseline building performance: the annual energy cost for a building design intended for use as a baseline for rating above-standard design or when using the Performance Rating Method as an alternative path for minimum standard compliance in accordance with Section 4.2.1.1.
below-grade wall: see wall .
best efficiency point (BEP): the pump hydraulic power operating point (consisting of both flow and head conditions) that results in the maximum efficiency .
boiler: a self-contained, low-pressure appliance for supplying steam or hot water.
modulating boiler: a boiler that is capable of more than a single firing rate in response to a varying temperature or heating load. packaged boiler: a boiler that is shipped complete with heating equipment, mechanical draft equipment, and automatic controls, and that is usually shipped in one or more sections. A packaged boiler includes factory-built boilers manufactured as a unit or system, disassembled for shipment, and reassembled at the site .
boiler system: one or more boilers and their piping and controls that work together to supply steam or hot water to heat output devices remote from the boiler .
branch circuit: the circuit conductors between the final overcurrent device protecting the circuit and the outlets; the final wiring run to the load.
bubble point: the refrigerant liquid saturation temperature at a specified pressure.
budget building design: a computer representation of a hypothetical design based on the actual proposed design . This representation is used as the basis for calculating the energy cost budget .
building: any structure used or intended for supporting or sheltering any use or occupancy.
building entrance: any doorway, set of doors, revolving door, vestibule, or other form of portal that is ordinarily used to gain access to the building or to exit from the building by its users and occupants. This does not include doors solely used to directly enter mechanical, electrical, and other building utility service equipment rooms.
building envelope: the exterior plus the semiexterior portions of a building . For the purposes of determining building envelope requirements, the classifications are defined as follows:
exterior building envelope: the elements of a building that separate conditioned spaces from the exterior. semiexterior building envelope: the elements of a building that separate conditioned space from uncon- ditioned space or that enclose semiheated spaces through which thermal energy may be transferred to or from the exterior, to or from unconditioned spaces, or to or from conditioned spaces .
building envelope trade-off schedules and loads: the schedules and internal loads [1], by building area type, to be used in the building envelope trade-off option simulations described in Normative Appendix C.
building material: any element of the building envelope, other than air films and insulation, through which heat flows and that is included in the component U-factor calculations.
building official: the officer or other designated authority having jurisdiction charged with the administration and enforcement of this standard, or a duly authorized representative.
building service: the equipment for delivering energy from the supply or distribution system to the premises served.
building service equipment: the necessary equipment, usually consisting of a circuit breaker or switch and fuses and accessories, located near the point of entrance of supply conductors to a building or other structure (or an otherwise defined area) and intended to constitute the main control and means of cutoff of the supply. Service equipment may consist of circuit breakers or fused switches provided to disconnect all undergrounded conductors in a building or other structure from the service-entrance conductors.
C-factor: see thermal conductance .
ceiling fan: a nonportable ( permanently installed ) device suspended from a ceiling or overhead structure for circulating air via the rotation of fan blades.
ceiling fan energy index (CFEI): the ratio of the electric input power of a reference ceiling fan to the electric input power of the actual ceiling fan as calculated per AMCA 208 with the following modifications to
- Schedules and internal loads by building area type are at https://web.ashrae.org/90_1files.
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 5