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Fundamental Series Item :HVAC Systems: How They Work <br />Posted on: 11/09r1D00 <br />HVAC Systems: How They Work <br />Samuel C. Monger <br />file:///c~/windows/T~MF/0,2637,14506,0 <br />The main purpose of commercial HVAC (heating, ventilating, and air conditioning) s~ , <br />provide the people working inside buildings with "conditioned" air so that they will hay <br />comfortable and safe work environment. "Conditioned" air means that air is clean an <br />and the temperature, humidity, and movement of the air are within certain comfort ra <br />Many factors affect the way people respond to their work environment. Air quality is ~ <br />factors. The American Society of Heating, Refrigerating and Air-Conditioning frngine <br />(ASHRAE) has established standards which outline air quality for indoor comfort con <br />are acceptable to 80% or more of a commercial building's occupants. Generally, the: <br />comfort conditions, sometimes called the "comfort zone," are between 68 degrees F <br />degrees F for winter and 73 degrees F to 79 degrees F during the summer. Both the <br />temperature ranges are for room air at approximatety 5b°~ relative humidity and mop <br />velocity of 30 feet per minute or slower. <br />Figure 1. HVAC system components. <br />The basics of heating, ventilating, and air conditioning systems <br />