Minimising energy requirement

Minimising energy requirement | Measures

1 | Compact building shape Both the oval reception building and the rectangular office building demonstrate a good A/V ratio. This leads to a reduction in the heat lost via the building envelope.

2 | High thermal protection The opaque structural members of the building envelope exhibit low thermal transmittance in line with the passivhaus standard. With a thermal transmittance of 0.8 W/m²K, the transparent structural members also have excellent thermal insulation properties. The high level of thermal insulation allows heat loss to be further reduced.

3 | External solar protection External blinds have been installed in order to prevent overheating.

4 | Airtight building envelope An airtight building envelope leads to a further reduction in heat loss. To verify the airtightness, a blower door test was carried out on the first floor. The measured air exchange rate n50 of 0.44 1/h satisfies the requirements of the passivhaus standard (see annex).

5 | Use of daylight All office and meeting rooms are positioned against the facades and have small room depths. There are no permanent lounges in the centre of the office building, which also admits daylight through the glass walls. A horizontal band facade was implemented in both buildings. The elevated lintel enables light to penetrate far into the office and meeting rooms. In order to verify the supply of daylight, a daylight simulation was carried out (see annex).

6 | LED lighting Energy-saving LED lights are used in the offices and meeting rooms. The lighting of the offices and passageways is controlled by presence detectors.

7 | Window ventilation The entire facade has windows that can be opened to ensure natural ventilation. Window ventilation is particularly useful between seasons when neither the heating nor air conditioning systems are in use. This saves energy compared with machine ventilation.

8 | Ventilation system with heat recovery In winter, 2-way ventilation is provided by a system involving air conditioning and ventilation with high-performance heat recovery. The low resistance in the channel network (optimum position of the air conditioning and ventilation system in the centre of the building, low air speeds) results in relatively low power requirement from the system‘s fans. 9 | ICA | BMS Top-class ICA technology was incorporated into the new buildings and enables the ambient room temperatures (individual room control) and air quantities (CO2 regulation in meeting rooms) to be controlled centrally and individually. A central building management system is used to monitor and optimise lighting, energy requirement, and energy generation.

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