Storm vestibules air lock

When an entry door is opened, the room air exchange with the ambient can increase by a factor up to 50 compared to the natural infiltration of a house built to an airtightness of 0.6 air changes by 50 Pa. Considering this, a storm vestibule offers two important benefits compared to a single highly insulated door:

• it impedes the penetration of wind into the house, saving energy (assuming that the doors are opened consecutively); and

• it improves comfort in spaces adjacent to the entry that would otherwise be confronted by cold draughts when people come or go.

Source: Lars Junghans, AEU GmbH, Wallisellen

Figure 9.3.7 Interior versus exterior vestibules: (left) Inset vestibule; (right) Exterior vestibule

Source: Lars Junghans, AEU GmbH, Wallisellen

Figure 9.3.7 Interior versus exterior vestibules: (left) Inset vestibule; (right) Exterior vestibule

Various vestibule configurations were modelled with the programme DEROB-LTH to quantify the effect of its design and construction on the resulting energy savings of the heated house.

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