Relier Pairs Air Distribution Systems - section 1Version en ligne Trade terms - Air Distribution Systems - section 1 par Valerie Jimenez 1 Cubic feet per minute (cfm) 2 Dew point 3 Wet-bulb temperature 4 Relative humidity (RH) 5 Total pressure 6 Revolutions per minute (rpm) 7 Velocity pressure 8 Psychometric chart 9 Pilot tube 10 Dry-bulb temperature 11 Blower door 12 Velocity 13 Static pressure 14 External static pressure (ESP) The speed that the air is moving. The rate of airflow is usually measured in feet per minute (fpm) The sum of the static pressure and the velocity pressure in an air duct. The pressure in a duct due to the linear movement of the air. It is the difference the total pressure and the static pressure. The pressure exerted uniformly in all directions within a duct system, usually measured in inches of water column (in. w.c) The ratio of the amount of moisture present in a given sample of air to the amount it can hold at saturation. Expressed in percent. The total resistance of all objects and ductwork in the air distribution system beyond the blower assembly. The number of rotations made by a spinning object over the course of one minute. A graphic method of showing the relationship of various air properties. The temperature at which air becomes saturated with water vapor, and the water starts t condense into droplets; at state of 100% relative humidity A tool used to take pressure measurements in a moving air stream. The temperature measured using a standard thermometer. It represents the measure of sensible heat present. An assembly containing a fan used to depressurize a building by drawing air out, to support duct leak testing. A unit of measure for the volume of air flowing pas a point in one minute. Temperature taken that takes into account he moisture content of the air, it reflects the total heat content (sensible & latent) of the air.
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