Tuesday, August 6, 2019

Download A to Z HVAC Terminology

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Abatement: Reduction or removal of a contaminant.
Absolute Temperature: Temperature measured from absolute zero.
Absolute Zero Temperature: Temperature at which all molecular motion ceases (-460 F. and - 273 C.)
Absorbent: Substance with the ability to take up or absorb another substance.
Absorption Refrigerator: Refrigerator which creates low temperature by using the cooling effect formed when a refrigerant is absorbed by chemical substance.
ACCA: A leading HVAC/R Association -
Acceptable indoor air quality: Indoor air that does not contain harmful concentrations of
contaminants; air with which at least 80% of building occupants do not express dissatisfaction.
ACGIH: American Conference of Governmental Industrial Hygienists.
ACH: Air Changes Per Hour. The number of times that air in a house is completely replaced with outdoor air in one hour.
Action Level: A term used to identify the level of indoor radon at which remedial action is recommended.

WC: (Water Column) Common measure of air pressure used in HVAC systems.
Weather Stripping: Specially designed strips, seals and gaskets installed around doors and windows to limit air leakage.
Wet Bulb Temperature: The temperature at which water, by evaporating into air, can bring the air to saturation at the same temperature. Wet-bulb temperature is measured by a wet-bulb
psychrometer. Traditionally this was the temperature indicated by a thermometer whose bulb is wrapped in a wet sheath. The wet bulb temperature and the dry bulb temperature (i.e air temperature) would then be used to calculate relative humidity or dewpoint. Alternatively charts or tables can be used.
Wet-bulb Temperature: When a wet wick is placed over a standard thermometer and air is blown across the surface, the water evaporates and cools the thermometer below the dry bulb temperature. This cooler temperature (called the wet-bulb temperature) depends on how much moisture is in the air.
Whole House Fan: A system capable of cooling a house by exhausting a large volume of warm air when the outside air is cool.
Zonal Control: A method of designing and controlling the HVAC system of a residence so that living areas can be maintained at a different temperature than sleeping areas using independent setback thermostats. If specific requirements are met, zonal control may earn a credit towards compliance with whatever building energy efficiency standards are applicable.
Zone: 1) Conditioned space in a house under the control of a thermostat. 2) A space within a house with a distinct pressure compared to other pressure zones. Also see Buffer zone. or 1) In
the context of an HVAC system: a space or group of spaces served by an HVAC system or portion of an HVAC system controlled by a single thermostat or other control device; 2) A space or group
of spaces within a building with sufficiently similar comfort conditioning requirements so that comfort conditions can be maintained throughout by a single control device.
Zone Heat: A central heating system in a building, designed to allow different temperatures to be maintained in two or more parts of the building.
Zoning: A system in which living areas or groups of rooms are divided into separate spaces and each space's heating/air conditioning is controlled independently. This can be accomplished by using either multiple independent systems, or a single system using electronic controls and motorized dampers (see Damper). For example, you might prefer to have the kitchen area of your home be slightly cool, while at the same time keeping the temperature in the bedrooms warmer.

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