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Viewing results 0 - 10 of 71 matches for "W" Back   |   Next
wall section
cross section of wall, or a drawing of it, arranged to reveal thermal and moisture migration characteristics.
wall sleeve
opening in a wall having a shroud insert to accept a pipe, duct, or equipment installed in or through the wall.
wall-mounted canopy hood
see canopy hood.
those portions of the building envelope that are vertical or tilted at an angle of 30 degrees or less from the vertical plane. Above grade—all the exterior walls of any given story if 50% or more of the gross exterior wall area of the story is exposed to outside air. Below grade—all the exterior walls of any given story if more than 50% of the gross exterior wall area of the story is below grade. Mass wall—a wall constructed of concrete, concrete masonry, insulating concrete form (ICF), masonry cavity, brick (other than brick veneer), earth (adobe, compressed earth block, rammed earth), and solid timber or logs.
warm up
(1) increase in space temperature to occupied setpoint after a period of shutdown or setback. Also referred to as morning warm up. (2) period of time required for a space to return to normal temperature after a period of shutdown or setback.
warming-up allowance
addition to the capacity of a heating system (as calculated for heat loss) to provide quick warm up in the morning.
waste energy sources
any useful energy source which otherwise would be unused or left to the environment.
waste heat
(1) heat rejected from the building (or process) because its temperature is too low for economical recovery or direct use. (2) unused heat rejected from a system, usually a heat engine or combustion furnace, to its surroundings.
transparent, odorless, tasteless liquid; a compound of hydrogen and oxygen (H2O), containing 11.188% hydrogen and 88.812% oxygen by mass; freezing at 32°F (0°C); boiling near 212°F (100°C).
water column (wc)
(1) tubular column located at the steam and water space of a boiler to which protective devices, such as gage cocks, water gage, and level alarms are attached. (2) unit of pressure.
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About ASHRAE Terminology

ASHRAE Terminology, a free resource, is a comprehensive online glossary of more than 3700 terms and definitions related to the built environment, with a focus on heating, ventilating, and air conditioning (HVAC), as well as refrigeration, building envelope, electrical, lighting, water and energy use, and measurement terms.

This searchable glossary was designed for use by engineering professionals but is also useful for architects, building owners and operators, educators, public officials, and homeowners.

The terms in ASHRAE Terminology have been assembled and defined and are updated on an ongoing basis by ASHRAE Technical Committee (TC) 1.6, Terminology. TC 1.6 is concerned with terminology, nomenclature, definitions, abbreviations, symbols, and the International System (SI) and Inch-Pound (I-P) units used in the fields of heating, ventilating, air conditioning, water heating, and refrigeration.

To request a free electronic file of the complete list of terms and definitions, email ashraetermseditor@ashrae.org.