Ventilation efficiency may be defined as the capability of a given ventilation system to achieve the best balance between indoor air quality and energy conservation requirements:
With respect to architecture and building materials, this reorientation process has led to advanced technological developments designed to achieve a reduction in the consumption of resources for heating purposes. There is a general trend to reduce the heat loss caused by a transmission through walls and windows. Today, triple glazing and well-insulated walls are used to cut the heating energy demand. On a medium-term basis, the transmission loss might be reduced by approx. 70% so that anaverage energy consumption of 50 kWh per m squared and year might possibly be attained in the future.
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