Variable Air Volume Components and types Part 1

Описание: Video Chapters


0:00 Variable Air Volume Components


0:21 Components of a VAV System
0:57 VAV Terminal Units
02:06 Single Duct, Cooling Only Terminals
03:21 VAV Reheat Terminals
05:12 Fan-Powered Terminal Units
05:45 Parallel, Fan-Powered Terminals
07:22 Series, Fan-Powered Terminals
08:44 Parallel Versus Series Fan-Powered
10:52 Summary of powered Single Duct Terminals
11:39 Single-Duct VAV Systems
12:30 Dual-Duct VAV Terminals
13:41 Variable Air Volume to the Space Terminals
15:04 Constant Air Volume to the Space Terminals


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.



For Support, please share and subscribe and don't forget to support this channel to continue:
For advertising :
[email protected]

To Support:

  / abuwardhvac  

https://paypal.me/AbuWardHVAC?country...

https://comfort.cbe.berkeley.edu/

https://paypal.me/AbuWardHVAC?country...