ASHRAE-90.1-2022- - Page 029
Extracted Content
semiheated floor area: see floor area, gross .
semiheated space: see space .
sensible energy recovery ratio: change in the dry-bulb temperature of the outdoor air supply divided by the difference between the outdoor air and entering exhaust air dry-bulb temperatures, expressed as a percentage.
sensible heating panel: a panel designed for sensible heating of an indoor space through heat transfer from the thermally effective panel surfaces to the occupants and/or indoor space by thermal radiation and natural convection.
service agency: an agency capable of providing calibration, testing, or manufacture of equipment, instrumentation, metering, or control apparatus, such as a contractor, laboratory, or manufacturer .
service water heating: heating water for domestic or commercial purposes other than space heating and pro- cess application requirements.
setback: reduction of heating (by reducing the set point ) or cooling (by increasing the set point ) during hours when a building is unoccupied or during periods when lesser demand is acceptable.
set point: point at which the desired temperature, °F, of the heated or cooled space is set.
SHGC: see solar heat gain coefficient .
shading coefficient (SC): the ratio of solar heat gain at normal incidence through glazing to that occurring through 1/8 in. thick clear, double-strength glass. SC does not include interior, exterior, or integral shading devices.
sidelighting effective aperture: relationship of daylight transmitted through vertical fenestration to the pri- mary sidelighted areas . The sidelighting effective aperture is calculated according to the following formula:
Sidelighting Effective Aperture
Vertical Fenestration Area Vertical Fenestration VT
= ----------------------------------------------------------------------------------------------------------------------------------------- - Area of Primary Sidelighted Area
where “ Vertical Fenestration VT ” is the visible transmittance of vertical fenestration as determined in accordance with Section 5.8.2.6.
simulation program: a computer program, including the simulation engine and the corresponding user interface, that is capable of simulating the energy performance of building systems .
simultaneous cooling and heating coefficient of performance (COPSHC): a ratio of the net heating capacity plus the net refrigerating capacity to the total input power at any given set of rating conditions. COPSHC applies to units that are operating in a manner that uses both the net heating and refrigerating capacities generated during operation. COPSHC takes into account the beneficial capacity as well as the heating capacity.
single-line diagram: a simplified schematic drawing that shows the connection between two or more items. Common multiple connections are shown as one line.
single-package vertical air conditioner (SPVAC): a type of air-cooled small or large commercial package airconditioning and heating equipment ; factory assembled as a single package having its major components arranged vertically, which is an encased combination of cooling and optional heating components; is intended for exterior mounting on, adjacent interior to, or through an outside wall ; and is powered by single or threephase current. It may contain separate indoor grilles, outdoor louvers, various ventilation options, or indoor free air discharge, ductwork, wall plenum, or sleeve. Heating components may include electrical resistance, steam, hot water, gas, or no heat, but may not include reverse-cycle refrigeration as a heating means.
single-package vertical heat pump (SPVHP): an SPVAC that uses reverse-cycle refrigeration as its primary heat source, with secondary supplemental heating by means of electrical resistance, steam, hot water, or gas.
single-rafter roof: see roof .
single-zone system: an HVAC system serving a single HVAC zone .
site: an area of land that is under the control of a single owner or entity, which contains systems or equipment .
site-recovered energy: waste energy recovered at the building site that is used to offset consumption of purchased fuel or electrical energy supplies.
skylight: a fenestration surface having a slope of less than 60 degrees from the horizontal plane. Other fenes- tration, even if mounted on the roof of a building, is considered vertical fenestration .
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 27