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Variable Air Volume (VAV) System

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System 1.
Variable Air Volume (VAV) system.

1.1 Introduction:

A VAV system is an air system that varies its supply air volume flow rate to match the reduction of space load during part-load operation to maintain a predetermined space parameter, usually air temperature, and to conserve fan power at reduced volume flow.

Types of VAV systems:
-Single-zone VAV system
A VAV system that varies the air volume flow rates supplied to and returned form a single-zone conditioned space to maintain a predetermined space parameter at reduced and to conserve fan power. Single-zone systems are widely used in indoor stadiums, assembly halls, shopping malls and factories, single-zone conditioned spaces.
-VAV cooling system
A multizone system with VAV boxes to modulate the cold supply air volume flow rate to match the variation of zone load to maintain a preset zone temperature. VAV cooling system with VAV boxes only are widely used to serve the interior zone in commercial …show more content…

Warm air and cold air are mixed in the mixing VAV box in order to maintain a predetermine zone temperature. For control zones in the interior zone, only a cold air duct is used to supply cold air to offset the year-round zone cooling load through VAV boxes. A dual-duct VAV system can be a built-up system with a cold deck and a hot deck, or it can be a combination of two air-handling units. Packaged units are seldom used for dual-duct VAV systems because of their more complicated configuration and controls. A dual-duct VAV system may condition and supply air separately to perimeter zones and interior zones. It is more flexible because the supply air temperature and the variation of supply volume flow rate can be matched better according to the zone load changes and outdoor ventilation air requirements. It is more energy-efficient than other VAV

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