This used air can then be rejected from the building, although some designs of AHU allow a portion of this air to be recycled back into the supply. A separate return fan pulls the air in through the grille and brings this back to the AHU. This again runs the length of the building and returns to the AHU. The return grille is connected to the main return duct. Industry bodies such as ASHREA, CIBSE, BSRIA provide guidance on the design of such system.īy the way you can download a personal copy of video HERE along with a PDF ebook, which you can store on your devices and use whenever you need HERE. The placement of the return grille will impact the effectiveness and the efficiency of the ventilation system. The return grille is typically on the opposite side of the room, sometimes at floor level, sometimes at ceiling level. This air is then circulated around the room and pushes the dirty used air into the return grille. Coming off of the main supply duct are a number of branches.Įach branch has a diffuser at the end, the diffuser has metal fins which are at an angle to direct the stream of air and distribute it across the room. The fresh ambient outdoor air is sucked into the AHU, it is then filtered and heated up or cooled down within the AHU and a fan pushes this out down the ductwork to be distributed throughout the building. First of all we have the main air handling unit in the mechanical room. Here we have a simple model of a CAV system for a simple small office. Other than small offices, you might still find these used in places such as operating theatres of hospitals as well as animal care centres to provide dedicated zone control. Although the initial install cost is lower, the running cost of the system will potentially be far higher than a VAV system, because CAV it is less energy efficient. Now, although Constant Air Volume systems are becoming less common in newer buildings, you might still find them being installed in smaller buildings and that’s because they’re easier, quicker and cheaper to install. This method provides superior zone control and reduced energy consumption.īy the way we have also covered vav systems in detail in our previous article. CAVĬAV is an older design method we still find this used in existing buildings but it’s less common in newer buildings because VAV systems are now the preferred choice of installation. It’s a type of HVAC air distribution system used in buildings where the volume of air suppled is kept constant but the temperature of the air is varied. What is a CAV System?ĬAV stands from Constant Air Volume. Scroll to the bottom to watch the YouTube tutorial. Learn about the basics of the CAV system, to understand the main parts and how it works.
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