Video Chapters


0:00 Variable Air Volume Components part (2)


0:26 Single-Fan, Dual-Duct VAV System
1:57 Two-Fan, Dual-Duct VAV System
03:33 VAV Terminal Unit Controls
04:29 Understand two fundamental control concept
05:58 Terminal-Unit Control Technologies
06:18 Pneumatic Control
07:52 Electronic Control
09:43 Direct Digital Control (DDC)
11:20 Diffusers
13:08 Thank You

The primary goal of any heating, ventilation, and air conditioning (HVAC) system is to provide comfort to building occupants and maintain healthy and safe air quality and space temperatures. Variable air volume (VAV) systems enable energy-efficient HVAC system distribution by optimizing the amount and temperature of distributed air. Appropriate operations and maintenance (O&M) of VAV systems is necessary to optimize system performance and achieve high efficiency.
VAV systems supply air at a variable temperature and airflow rate from an air handling unit (AHU). Because VAV systems can meet varying heating and cooling needs of different building zones, these systems are found in many commercial buildings. Unlike most other air distribution systems, VAV systems use flow control to efficiently condition each building zone while maintaining required minimum flow rates.
Some features of a VAV system include the following:
• Distribution system provides conditioned air to spaces to meet varied zonal temperature and airflow requirements.
• Variable frequency drive-based air distribution system can reduce supply fan energy use.
• Supply-air temperature reset capability allows adjustment and reset of the primary delivery temperature with the potential for savings at the chiller or heating source.
• There are two major classifications of VAV boxes or terminals—pressure dependent and pressure independent.
• A VAV box is considered pressure dependent when the flow rate passing through the box varies with the inlet pressure in the supply duct. This form of control is less desirable because the damper in the box is controlled in response to temperature only and can lead to temperature swings and excessive noise.

• A pressure-independent VAV box uses a flow controller to maintain a constant flow rate regardless of variations in system inlet pressure. This type of box is more common and allows for more even and comfortable space conditioning.



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