German Historic Museum, Berlin

Assignment
In the course of reconstruction we were to provide a decentralized A/C system for the exhibition rooms in order not to make too many changes to the historic building. The A/C units should include functions such as cooling, heating, outside air supply, humidification and dehumidification while ensuring a high steadiness of temperature and humidity in the exhibition rooms in terms of time and room. These requirements are mandatory in museums for the protection of the exposed items.

Solution
LTG, in cooperation with the Engineering Office Transsolar, has designed a concept in which a fan coil unit in each parapet recess share this task. One part of the unit is responsible for the recirculated air cooling/heating and dehumidification of the air. This supply air flow is uniformly distributed over the entire room width. The second part of the unit sucks in outside air and releases it into the room at a defined under temperature. This displacement air spreads as a fresh air flow into large room depths.

In order to verify this design, we rebuilt a façade section of the museum in the LTG Room Flow Lab. Indoor air flow visualization in a 1:1 test resulted in a perfect fresh air distribution over the entire occupied zone. Measurement of the air speed and room air temperature showed a homogeneous distribution in any case, thus ensuring thermal comfort in the occupied zone.

Advantage
The result is a decentralized A/C system that meets particularly high functional safety requirements and is most appropriate for reconstruction and for air conditioning high-ceiling rooms.