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