Ventilation

A low energy building has a tight building envelope to ensure controlled and adequate ventilation and to avoid moisture damage of the building construction. This makes it necessary to have a controlled ventilation system in the building. In many cases mechanical, balanced ventilation with heat recovery is the most energy efficient solution. It must be dimensioned to meet the heating and ventilation needs in the building and regulate the indoor temperature automatically.

Moreover, it should be assessed whether there is a need for cooling. If air conditioning can be reduced by installing solar shading or by changing the building design this is the most energy-efficient solution. If this is not sufficient to keep the temperature acceptably low, the ventilation system may have to include cooling.

Energy requirements for buildings should always take account of the general indoor climate conditions in order to avoid possible negative effects such as inadequate air exchange rates. Therefore, most national building codes specify a legal requirement for the air exchange rate in new buildings.

When tightening existing buildings, it is also important to ensure an adequate air exchange rate.

In very low energy houses as this Italian one, an energy efficient ventilation system is crucial for the indoor climate.

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Ventilation

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