During the recent decades, energy consumption of buildings, together with the costs for operation, has gained increasing concern. HVAC systems stand for a significant share of the total energy consumption in buildings. Demand-controlled ventilation (DCV) has proved to be an efficient system that gives opportunity to strongly reduce energy consumption, especially when contamination loads or temperature load vary during the operating hours. 30-60% energy reduction can be expected by applying proper DCV. However, while focusing on energy savings, it is important to simultaneously maintain acceptable indoor air quality (IAQ) and thermal comfort. There is thus a need for a balance of emphasis between different IAQ factors such as CO2 concerntration, volatile organic compounds (VOC), etc. when the DCV control strategies are assessed and implemented.
The aim of this paper is to provide advices for choosing DCV control strategies by evaluating existing ones such as CO2 concentration control, Multi-zone control, dynamic-occupancy-detecting control etc. by matching them with users’ preferences according to different building types for residential buildings, office buildings and schools.