Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| water draw rate |
rate at which hot water is
withdrawn from the system over a specified period at a specified time |
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| water gage (wg) |
1. gage glass with
attached fittings which indicates water level within a vessel.
2. designation
that water is the fluid in a manometer. |
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| water heater | closed vessel in which
water is heated by the combustion of fuels, electricity, or any other source
and is withdrawn for use external to the system at pressures not exceeding 160
psig [1100 kPa (gage)], including the apparatus by which heat is generated, and
all controls and devices necessary to prevent water temperatures from exceeding
210°F (99°C). See also boiler |
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| water holding capacity |
during a drying
process, the ability of a substance to retain water. |
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| water pollutant |
substance
introduced into potable water, thus creating an objectionable condition, but
not creating a health hazard. Compare water contaminant. |
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| water treatment |
process that
alters supply water so that it can be used for process or HVAC purposes without
deleterious effect. |
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| water vapor |
water in the vapor or gas
phase. |
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| water vapor content | in a gas, the mass of
water vapor per unit mass of dry gas |
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| water vapor migration (vapor transfer; v |
transmission of
water vapor through insulating or othermaterial resulting from the difference
in partial pressures on both sides. |
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| water vapor permeability |
time rate of
water-vapor transmission through unit area of flat material of unit thickness
induced by unit vapor pressure difference between two specific surfaces, under
specified temperature and humidity conditions. When permeability varies with
psychrometric conditions, the spot or specific permeability defines the
property at a specific condition. Note:
Permeability is a property of a material, but the permeability of a body that
performs like a material may be used. Permeability is the arithmetic product of
permeance and thickness. |
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