ASHRAE-90.1-2022- - Page 020
Extracted Content
generally accepted engineering standard: a specification, rule, guide, or procedure in the field of engineering, or related thereto, recognized and accepted as authoritative.
grade: the finished ground level adjoining a building at all walls .
greenhouse: a space with a skylight roof ratio of 50% or more above the growing area used exclusively for horticultural production, cultivation, or maintenance by utilizing a sunlit environment. Greenhouses are spaces erected for a period of 180 days or more.
gross conditioned floor area: see floor area, gross .
gross floor area: see floor area, gross .
gross lighted floor area: see floor area, gross .
gross roof area: see roof area, gross .
gross wall area: see wall area, gross .
growth media: an engineered formulation of inorganic and organic materials including but not limited to heat-expanded clays, slates, shales, aggregate, sand, perlite, vermiculite, and organic material including (but not limited to) compost worm castings, coir, peat, and other organic material.
heat capacity (HC): the amount of heat necessary to raise the temperature of a given mass 1°F. Numerically, the HC per unit area of surface (Btu/ft [2] ·°F) is the sum of the products of the mass per unit area of each individual material in the roof, wall, or floor surface multiplied by its individual specific heat.
heat recovery coefficient of performance (COPHR): a ratio of the net heat recovery capacity plus the net refrigerating capacity to the total input power at any given set of rating conditions. COPHR applies to units that are operating in a manner that uses either all or only a portion of heat generated during chiller operation to heat a load, while the remaining heat, if any, is rejected to the outdoor ambient. COPHR takes into account the beneficial cooling capacity as well as the heat recovery capacity.
heat trace: a heating system where the externally applied heat source follows (traces) the object to be heated (e.g., water piping ).
heated space: see space .
heating degree-day, base: see degree-day .
heating design temperature: the outdoor dry-bulb temperature equal to the temperature that is exceeded at least 99.6% of the number of hours during a typical weather year.
heating seasonal performance factor (HSPF): the total heating output of a heat pump during its normal annual usage period for heating (Btu) divided by the total electric energy input during the same period. ( Informative Note: HSPF2 reflects the new higher static and load line effective 1/1/2023.)
high-end trim: process of setting the maximum light output of individual luminaires or groups of luminaires to support visual needs of a space, task, or area. High-end trim is also known as “institutional tuning” or “task tuning.”
historic: a building or space that has been specifically designated historically significant by the adopting authority or is listed in The National Register of Historic Places or has been determined to be eligible for such listing by the U.S. Secretary of the Interior.
hot-water supply boiler: a boiler used to heat water for purposes other than space heating.
humidistatic controls: automatic controls used to maintain humidity at a fixed or adjustable set point .
HVAC system: the equipment, distribution systems, and terminals that provide, either collectively or individually, the processes of heating, ventilating, or air conditioning to a building or portion of a building .
HVAC zone: a space or group of spaces within a building with heating and cooling requirements that are sufficiently similar so that desired conditions (e.g., temperature) can be maintained throughout using a single sensor (e.g., thermostat or temperature sensor).
hydronic system balancing: see balancing, hydronic system .
IEC Design H motor: an electric motor that
a. is an induction motor designed for use with three-phase power; b. contains a cage rotor; c. is capable of direct-on-line starting; d. has 4, 6, or 8 poles;
18 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)