Save energy without compromising on indoor climate
The reason for adjusting the airflow is simple. It is not necessary to supply the same air volume for full rooms when they are actually empty. With CAV, the airflow is constant and often set to a higher volume to avoid low air supply when the room is full. Of course, this means that the same amount of air is supplied even though the room is completely empty. The solution to this is called demand-controlled ventilation. VAV and DCV are two types of demand-controlled systems that help you save energy.
One purpose - two different systems
VAV and DCV systems fulfill the same purpose, to adapt ventilation and air conditioning to varying levels of activity in our premises. In general, it is possible to achieve higher energy savings and better indoor climate with a more advanced system. But there are of course also applications where simpler systems work well. What, then, are the differences and benefits of the two options?
VAV - Variable Air Volume
- Simple demand control - the air flow can vary over the operating time and can be adapted to e.g. temperature or air quality
- This often means lower investment costs for smaller projects compared to DCV
- Often meets the requirements for simpler projects, such as preschools and smaller schools
- Often provides good energy savings compared to CAV (constant flow system)
DCV - Demand Controlled Ventilation
- Advanced demand management - adjusts air flows and temperature depending on the needs and presence status of the premises, e.g. with different operating cases
- Greater opportunity for customised comfort according to different customer needs
- It is often possible to combine air and waterborne products for a complete indoor climate system
- A strong contributing factor to a good classification in various certification programs such as BREEAM, WELL and LEED
- Greater opportunities for energy savings, which is especially an advantage in buildings with high energy consumption for ventilation and air conditioning
Advanced, not complicated!
Of course, we want the premises we occupy to be ventilated correctly for the best health and wellbeing. But in most types of buildings, the level of activity varies around the clock, which means that we often ventilate empty rooms as if they were full!
The most advanced system to counter this is DCV. In this case, advanced means a smart system that is technically more developed without introducing any complexity. This unlocks extra opportunities to maximize comfort, minimize costs and avoid unnecessary energy consumption.
Three basic functions with DCV:
- The air is moved where the need is
- Always stepless
- Always supervised
DCV regulates based on:
- Temperature - To keep the right temperature in the room
- Air quality - To ensure comfort and health in the room
- Humidity - So that the building is not exposed to mold-promoting moisture content
- Occupancy - To save energy
Since ventilation is based on presence and needs, the system runs on "economy speed" as soon as the needs decrease in the building