What is a constant volume air system?
Constant air volume (CAV) is a type of heating, ventilating, and air-conditioning (HVAC) system. In a simple CAV system, the supply air flow rate is constant, but the supply air temperature is varied to meet the thermal loads of a space. Most CAV systems are small, and serve a single thermal zone.
What is difference between VAV and CAV?
Variable air volume (VAV) is a type of heating, ventilating, and/or air-conditioning (HVAC) system. Unlike constant air volume (CAV) systems, which supply a constant airflow at a variable temperature, VAV systems vary the airflow at a constant temperature.
How does the CAV system work?
CAV System A CAV unit operates the fan and compressor at full capacity until the temperature drops to a specified setting, then the compressor turns off. One for the coldest and one for the hottest needed air temperature in the zone. The two air streams are strategically combined to offset the space’s load.
What is a constant volume damper?
These versatile dampers are designed to maintain a constant volumetric flow rate. The control system allows for the required flow rate value to be set and can include both upper and lower threshold values.
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 a constant volume VAV box?
EB Air VAV box is a twofold operation HVAC system, CAV (constant Air Volume) which supply a constant airflow at a variable temperature whereas VAV (Variable Air Volume) system varies the airflow at a constant temperature.
Which is better CAV or VAV?
In general, CAV systems are less expensive and simpler to design and install, while VAV systems offer superior performance and energy savings for a higher upfront cost. In most cases, VAV ventilation the best option because long-term energy savings far outweigh the additional system cost.
What is a CAV controller?
CAV controllers. Type VFC. For low airflow velocities. Circular mechanical self-powered volume flow controllers for the control of. supply air or extract air in constant air volume systems with low airflow velocities.
How does a constant volume damper work?
The air is forced to pass through a predetermined space in which the plastic adjustable flap can change its position in accordance with a precisely specified airflow. Airflow is set with a screwdriver. When the air flow pressure is rising, the CAV damper automatically closes to maintain a steady airflow rate.
How can air flow be constant?
Constant airflow is achieved by controlling the free area through the device. At minimum static pressure, the aero-wing is parallel to the air stream. As the static pressure increases, the aero-wing lifts, reducing the amount of free area through the regulator.