Variable Air Volume - VAV system HVAC

The video tutorial explains the Variable Air Volume (VAV) system, highlighting its energy efficiency and zoning capabilities compared to Constant Air Volume (CAV) systems. It details the components of a VAV system, including the main AHU, supply and return ducts, diffusers, and VAV terminals. The tutorial covers the control mechanisms, such as thermostats and dampers, and discusses airflow and temperature regulation. It also addresses pressure management for energy efficiency and introduces fan-assisted VAV boxes to maintain air turnover and comfort.

What does VAV stand for in HVAC systems?

• Ventilation Air Velocity

• Variable Air Velocity

• Ventilation Air Volume

• Variable Air Volume

Why are VAV systems preferred over CAV systems in office buildings?

• They require less maintenance

• They are more energy efficient and allow zoning

• They are cheaper to install

• They provide better air quality

What is the typical temperature of air supplied by a VAV system?

• 20 degrees Celsius

• 13 degrees Celsius

• 10 degrees Celsius

• 18 degrees Celsius

What is the primary function of a VAV terminal?

• To heat the air

• To control air flow into a zone

• To filter the air

• To humidify the air

How does a damper in a VAV system function?

• It filters the air

• It heats the air

• It modulates air flow into the zone

• It cools the air

What role does the airflow sensor play in a VAV system?

• It measures air velocity

• It measures air humidity

• It measures air pressure

• It measures air temperature

How does a VFD contribute to energy efficiency in a VAV system?

• By reducing fan speed based on pressure

• By increasing air flow

• By cooling the air

• By heating the air

What is the purpose of fan-assisted VAV boxes?

• To filter the air

• To maintain constant air volume

• To increase air temperature

• To reduce air humidity

Why is it important to avoid cold air being dumped from diffusers?

• It can reduce air quality

• It can increase energy costs

• It can lead to discomfort and health issues

• It can cause equipment damage

What is a potential consequence of improper air distribution in a VAV system?

• Increased energy efficiency

• Improved air quality

• Sick building syndrome

• Reduced maintenance calls