Efficiently ventilated, smartly controlled
Building owner: F. W. Ziesak GmbH & Co. KG
Town/City: Bochum 44894
The Ziesak Hagebau market is conveniently located between Bochum and Dortmund, just off motorway 40. That’s not the only reason why the building centre is so popular. And so the old building became too small for the Ziesak family. The family needed a new building: Instead of providing customers with a 6,000 square metre retail space, customers now enjoy a 20,000 square metre retail space, creating one of the largest DIY stores in the Ruhr area. The new building boasts 400 parking spaces, a bakery, a kiosk and a drive-in – and pioneering air conditioning technology.
Pioneering because the Hybrid ECO system was installed here. This is a bi-directional ventilation system, in which temperature control does not take place in the central unit but via the decentralised units in the interior of the room. In Bochum, this is provided by a combination of KaCompact ventilation units and TOP unit heaters. As a result, no air duct system is needed. And the energy consumption is as low as possible due to precise on-demand, CO2-controlled ventilation.
The KaCompact units were transported by helicopter to the roof of the building: not because the units are so heavy but because of the size of the roof. A crane with an arm could be installed there during the construction phase. By contrast, the design of the KaCompact makes them real lightweights.
The remaining heating in the other buildings is provided by TOP unit heaters operating in secondary air mode and a few Ultra units installed wherever the roof is suspended. Seven door air curtains with Tandem technology protect the entrances from the ingress of cold air. An individually configured air handling unit also provides fresh air to the administration wing.
All air conditioning units are centrally controlled by Kampmann’s building management system, KaControl: The secondary air units are connected via ModBUS to the KaControl. KNX allows the system to be controlled zonally – enabling optimum energy-saving operation.