TS EN 15241/AC

TS EN 15241/AC. OFFICIAL SCOPE IS UNAVAILABLE. This record concerns the technical topic of calculating energy losses associated with ventilation and infiltration in buildings. From the title alone, the standard is clearly about building-scale air exchange and its effect on heating and cooling energy, rather than about a single piece of equipment. In practical terms, it is relevant wherever outdoor air supply, air leakage, and filtration-related airflow effects influence the energy balance of a building.

How ventilation, infiltration, and energy loss are connected

In general engineering terms, ventilation is the intentional supply and removal of air to maintain indoor air quality, while infiltration is the unplanned movement of air through cracks, joints, and other leakage paths in the building envelope. Both can increase thermal loads because incoming air must usually be heated, cooled, humidified, or dehumidified to match indoor conditions. Filtration is also relevant because it can add pressure drop to the air path and therefore affect fan power demand. For that reason, energy calculations in this field typically consider air volume flow, pressure losses, and operating conditions together.

What a calculation method like this is used for

Standards on this topic help engineers evaluate ventilation impacts in a consistent way when assessing building energy performance. In offices, commercial premises, and similar occupied buildings, the result depends on outdoor air requirement, system configuration, occupancy pattern, and climate. The subject is therefore broader than fan efficiency alone: it links the way air enters the building, moves through the system, and exchanges heat with the indoor environment. Because this listing is an amendment or corrigendum record, it should be understood as related to the parent standard’s topic rather than as a standalone replacement for the full base document.