A ventilation system controller based on pressure-drop and CO 2 models

Control Strategies in Multi-Zone Air Conditioning Systems

“…To address these challenges and reduce the energy consumption by the ventilation system, it is identified that the air distribution system is the critical parameter. Reducing the volume of airflow required by the system, while achieving the appropriate levels of IAQ, will have a significant impact on the overall performance of the HVAC systems [15]. Equally important, if the ventilation system is using less air flow-so that conditioning less air-equipment such as the chiller, cooling towers, pumps and other mechanical services will have a lower load with less energy demand.…”

“…Since then, various improvements in the control, measurement techniques and sensors have been developed [18]. More recently different studies have been looking for simpler, more efficient and less expensive solutions to deliver the minimum amount of airflow while endeavouring to provide an ideal IAQ [15]. By using motor flaps-instead of VAV boxes-the air flow could be regulated.…”

“…This means that a reduction of the air volume flow by 10% will result in power consumption savings of 27%. In detail, it is critical to reduce the overall air volume flow required by the VAV system to meet the comfort levels as well as avoiding peak periods of high air volume demand followed by low air volume flow demand periods [15].…”

“…In conventional systems, VAV boxes play a major role in both energy consumption and thermal comfort as they control the overall airflow required (but struggle with and are restricted to a 30% minimum supply to avoid airdrop) by the system as well as the airflow delivered to each zone. They have multiple components such as a controller, temperature sensor, actuator, damper, reheating coil and air flow sensor [22], VAV boxes are complex devices with embedded electronics which are expensive and prone to failures [15,19]. Hence, they are only applicable to large or medium construction projects [7].…”

Indoor air quality modelling and measurements of a studio apartment with a mechanical exhaust system

“…The level and improvement of indoor air quality (IAQ) is an on-going subject that is the topic of interest for researchers around the world for both residential and non-residential buildings [1][2][3][4][5][6][7][8][9]. Lan and Lian [2] proved the level of indoor air quality and thermal regulation influences the quality of sleep while Madureira et al [9] conducted a study to connect the indoor air quality in schools and its relationship with children's respiratory symptoms.…”