Variable Air Volume

For larger buildings with multiple zones or spaces, CAV was inefficient. As technology advanced and the costs of heating and cooling increased, innovative solutions were necessary to improve HVAC efficiency. Today, accurate, reliable sensor technology provides data for increased building efficiency and control with variable air volume (VAV) systems. In larger buildings with multiple zones, VAV controllers are more effective than CAV designs. VAV uses a constant temperature and varies the air volume to keep spaces comfortable while saving energy. The volume flow is controlled through dampers. If an individual space’s load changes, the damper in a VAV system will adjust to compensate. For example, if there is no need for any heating or cooling in a room, the damper could close 100%. The energy that would have been wasted in that space can now flow to other areas. In some situations, dampers closing might create back pressure. Sensitive pressure sensors can detect subtle changes in VAV systems and reduce air flow which provides additional energy saving. VAVs require temperature, and pressure sensors to monitor air flow, filter performance, and damper control. There are averaging probe (510M series), duct probe (514M series), and flange mount stainless steel (GA10K3D536) temperature sensors that are cost-effective and easy to install. If closing a damper creates back pressure, sensors such as TE Connectivity’s (TE) LMI/LHD will detect small changes (0.1”FS) and reduce motor and blower speeds. HVAC temperature and pressure sensors provide accurate and reliable data to adjust dampers and air flow to manage the ever-changing demands in multiple zones for more efficient buildings. TE delivers long lasting stable designs with multiple ways to connect to promote ease to implementation, greater control, and efficiency in HVAC systems.