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What is variable air volume box?


What is variable air volume box?

A VAV — i.e., Variable Air Volume — HVAC (heating, ventilation, and air conditioning) system that supplies air at varying levels or amounts at a constant temperature. These comprise of multiple VAV terminal units or boxes that diffuse air in specific areas of a large indoor space, such as an auditorium.

What are the advantages of variable air volume air conditioning system?

The big advantage of VAV systems with terminal units is that they are able to meet the comfort requirements of different zones in a building without heating and cooling at the same time. VAV systems are either pressure dependent or pressure independent.

What is a VVT box?

A variable volume and temperature (VVT) HVAC system uses multiple airflow dampening controls to regulate the airflow from an air handling unit (AHU). This allows a single AHU to meet the heating or air conditioning needs of multiple zones without purchasing additional AHU’s.

What is the purpose of a variable air volume system?

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.

How does variable air volume system work?

Variable Air Volume (VAV) is a type of heating, ventilating, and/or air-conditioning (HVAC) system. The VAV Zone Controller has a built-in actuator and maintains zone temperature by operating the terminal fan and regulating the flow of conditioned air into the space.

What is the advantage of installing constant air volume HVAC system?

CAV systems keep a constant airflow, as their name implies, and the desired indoor conditions are reached by adjusting the air supply temperature. For example, when a building requires a higher cooling output on a hot summer day, the CAV system delivers colder air.

What is the difference between a VVT and VAV?

VAV systems use variable frequency drives to slow the supply fan speed when the dampers in the boxes close. VVT systems maintain a bypass between the supply and return ducts to the unit, meaning that the fan runs full tilt regardless of whether the VVT boxes are fully open or averaging 20% open.

What does VVT in HVAC stand for?

Introduction. Variable Volume & Temperature (VVT) is a zone damper terminal air unit system typically used to create zoning when paired with packaged rooftop air handling units (RTU). The classic deployment is the small to mid-sized low-rise commercial office building.

What is the function of VAV?

How do VAV systems work?

VAV stands for Variable Air Volume. In its simplest form, VAV systems use varying airflow at a constant temperature to heat and cool buildings. This is opposite of a CAV (or Constant Air Volume) system, which supplies consistent air flow at varying temperatures to heat or cool a space.

What does variable air volume box stand for?

A variable air volume box, more commonly known as a VAV box, is an essential part of the air conditioning in any large industrial or commercial building. Air conditioning is part of a larger entity called a HVAC system, which encompasses heating, ventilation, air conditioning, and control systems.

What do you need to know about a VAV box?

The most basic VAV box consists of an enclosure with a small air valve (damper) that regulates the air flow in response to the room’s thermostat. In a VAV system, an air handling unit (AHU) cools or heats air to accommodate the zone with the most extreme requirements, supplying the air through ducts to various zones.

What’s the difference between a CAV and a box?

This box is in contrast to a CAV, or constant air volume system. This air conditioning component is just what it sounds like: a box that can hold a variable amount of air. It helps make air conditioning systems more efficient by regulating the amount of cooling targeted toward any specific room or area.

What does Vav stand for in HVAC category?

The VAV box is a HVAC component alongside other pieces of hardware such as coils and drain pans, humidification and dehumidification equipment, air dampers, air filters, ducts, exhaust systems, return air plenums, and so on. This box is in contrast to a CAV, or constant air volume system.