Constant Air Volume - CAV

The video tutorial explains the differences between Constant Air Volume (CAV) and Variable Air Volume (VAV) systems in HVAC. It covers the components, limitations, and design considerations of CAV systems, highlighting their inefficiencies compared to VAV systems. The tutorial also discusses advanced configurations and potential solutions to improve energy efficiency, such as using reheaters and dual duct systems. It concludes with tips for optimizing CAV systems to reduce operating costs.

What does CV stand for in HVAC systems?

• Constant Volume

• Controlled Ventilation

• Constant Air Volume

• Centralized Ventilation

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

• They are cheaper to install

• They are more compact

• They provide better zone control and energy efficiency

• They require less maintenance

What is the primary function of a diffuser in a CAV system?

• To filter the air

• To heat or cool the air

• To recycle used air

• To direct and distribute air across the room

How does a CAV system maintain a constant air volume?

• By adjusting the air temperature

• By changing the duct size

• By using multiple air handling units

• By varying the air pressure

What is a major limitation of CAV systems?

• They cannot vary the air temperature

• They provide the same temperature air to all rooms

• They require frequent maintenance

• They are too expensive to install

Why might a CAV system be inefficient in a building with varying room demands?

• It uses too much electricity

• It provides the same temperature air regardless of room needs

• It cannot handle large volumes of air

• It requires complex controls

What is a potential solution to improve temperature control in CAV systems?

• Installing larger ducts

• Using terminal reheaters

• Increasing the air volume

• Adding more diffusers

What is a dual duct CAV system?

• A system with two air handling units

• A system with separate ducts for hot and cold air

• A system with dual temperature controls

• A system with two return grills

How can energy efficiency be improved in dual duct systems?

• By using a single duct for both hot and cold air

• By increasing the air volume

• By reducing the number of diffusers

• By enabling a temperature reset

What is a disadvantage of using terminal reheaters in CAV systems?

• They are difficult to install

• They increase energy consumption

• They reduce air quality

• They require frequent maintenance