Construction of an exterior vestibule

Source: Lars Junghans, AEU GmbH, Wallisellen

Figure 9.3.8 Temperatures inside the vestibule compared to the ambient temperature

Source: Lars Junghans, AEU GmbH, Wallisellen

Figure 9.3.8 Temperatures inside the vestibule compared to the ambient temperature

Because the principle function of the vestibule is as a buffer and as wind protection, a low cost construction was assumed (walls and roof: U = 1.0 W/m2K; doors: U = 1.6 W/m2K; and glazing: U = 1.8 W/m2K). The temperature in the vestibule is consistently 3 K to 4 K warmer than the ambient temperature in all three climate types. Figure 9.3.8 shows the temperature profile over three very cold days in the temperate climate.

The extreme case of a fully glazed vestibule (all three walls) was compared to an insulated vestibule. Since the vestibule is not heated and is cool, the U-value of the construction is not important. The glass vestibule showed no difference in savings compared to the savings from the opaque insulated vestibule in the cold climate.

Location of the vestibule

The entry with vestibule was moved from the north to the south side of the house. All other conditions were kept the same. This had the negative influence of reducing the possible south-facing window area for direct solar gains into the heated living space. The result is that the positioning of the vestibule on the south side increased the space heating demand in all climates, as can be seen in Table 9.3.5.

Table 9.3.5 Effect of a vestibule location on house heating demand (kWh/m2a)

Climate

North side

South side

Cold

12.8

15.1

Temperate

12.9

15.0

Mild

12.7

14.5

A vestibule or a highly insulated door

Here a vestibule with two conventional doors

is compared to the

case of no vestibule and a single

highly insulated door. In all three climates, the vestibule saves energy compared to the single door, as

can be seen in Table 9.3.6.

Table 9.3.6 Effect of a vestibule versus a super door on house heating demand (kWh/m2a)

Climate

Vestibule

Super door

Cold

12.8

14.6

Temperate

12.9

14.9

Mild

12.7

14.4

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