As part of the Smart City Rheintal project the urban quarter SEESTADT Bregenz will be realized: a pioneering, diversified neighbourhood, closely linked to the existing town. To meet the energy demand of the offices, flats and shops in this new neighbourhood, the local utility Stadtwerke Bregenz GmbH plans to tap Lake Constance as a source of heat by means of heat pumps. As its temperature is virtually constant, lake water is an ideal source of heat.
In summer the lake water‘s temperature (essentially at a defined extraction depth of around 40 m) is to be used to air-condition the buildings by means of free cooling; the secondary cooling circuit operates with an inlet temperature of around 10°C and a return temperature of around 16°C, using a heat exchanger. This method of air-conditioning needs neither chillers nor a recooling system (e.g. via the roof). The water returned is cooled down in the primary circuit in Lake Constance. In winter the energy in the secondary circuit is used in electric heat pumps for low-temperature space heating.
The initial assessment as per Austrian law indicates that this use of lake water can be authorized, and thus be implemented in the course of realizing the construction projects.
CONTACT
Christian Eugster, illwerke vkw
christian.eugster@vkw.at
www.smartcityrheintal.at/seestadt
www.smartcityrheintal.at/seequartier
Video Smart City Rheintal (in german)
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