Außenluftmenge

Außenluftmenge refers to the volume of outside air introduced into a building or enclosed space. This quantity is a critical parameter in ventilation systems, impacting indoor air quality and thermal comfort. It is typically measured in cubic meters per hour (m³/h) or liters per second (l/s). The required Außenluftmenge is determined by various factors, including the building's intended use, occupancy, and the presence of potential pollutants. For example, spaces with higher occupancy, such as offices or classrooms, generally require a greater Außenluftmenge per person to maintain adequate oxygen levels and remove exhaled carbon dioxide. Similarly, areas with specific activities like kitchens or laboratories may have higher requirements due to the generation of fumes or other contaminants. Standards and regulations, such as those provided by DIN EN 13779 in Europe, specify minimum Außenluftmengen for different building types and zones. Proper control of Außenluftmenge is essential for balancing fresh air supply with energy efficiency, as conditioning this incoming air (heating or cooling) represents a significant portion of a building's energy consumption. Inadequate Außenluftmenge can lead to poor indoor air quality, resulting in symptoms like headaches, fatigue, and respiratory irritation, often referred to as "sick building syndrome." Conversely, excessive Außenluftmenge can lead to unnecessary energy loss and increased operational costs. Therefore, ventilation system design and operation aim to optimize this crucial parameter.