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In doing so, it is indifferent to uneven flow profiles, air turbulence, and pressure variations. Dependant vs. Independent Systems VAV systems can be either dependent or independent. The difference is mostly in the VAV box design. Dependent VAV boxes modulate the damper position in proportion to the cooling load. Independent VAV boxes modulate the air volume in proportion to the cooling load. Independent VAV boxes can measure the amount of air passing through them while dependent VAV boxes cannot.

The air-handling unit should be selected and the ductwork designed for 6,000 cfm with a diversity of 83%. It is not an uncommon practice to “default” to a minimum cfm/ft2 and design the air system based on this airflow while applying diversity to the cooling plant (chiller) size. This practice should be discouraged, as it will result in an oversized air handler and ducting. Even worse, the cooling load calculated from the air handling unit psychrometrics and the cooling load from the load estimation won’t match.

Some Multizone systems simultaneously mix cooled air and heated air to meet the requirements of the zone. While they were very popular in schools during the 1970s, many systems have reached the end of their useful life and needed to be replaced. 2) to existing buildings. 1-1999 compliance should be taken into consideration. There several exceptions allowed by the Standard. It is recommended that the readers familiarize themselves with this section of the Standard. Application Guide AG 31-004 37 Heating and Ventilating Systems Heating and ventilating systems are the most basic central system.

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