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SPARKASSE CENTRE SCHWARZWALD-BAAR, DONAUESCHINGEN NEW BUILDING AND REFURBISHMENT OF THE BANK AND ADMINISTRATION BUILDING USING 100% GEOTHERMAL COOLING

Scope of supply

Planning and site management for a new wing and refurbishment of the listed existing Sparkasse building for the trades/systems heating, air-conditioning, cooling, chilled ceilings, I&C and BMS. 

·         Use of geothermal heat with 56 geothermal probes for cooling and heating at a depth of 99 m.

·         3,500 m² chilled ceilings, 7 local air conditioners, cooling using geothermal probes

·         150kW heat pump for additional heating.

·         The building’s air-conditioning uses solely geothermal energy  

Detailed description of building measures
The Sparkasse Donaueschingen decided to use the alternative energy “Geothermal energy, Natural Energy – Gold” to supply its new building. For this 56 geothermal probes were inserted into the ground, at a depth of about 100 metres to draw energy from the ground that has been absorbed from the sun.

To maintain the storage capacity of the ground, and to optimise winter operation, the 30 geothermal probes in the middle part of the field were each bored to a depth of 99 metres, while the 26 surrounding probes were bored to 90 metres, so as to ensure the extraction of heat in summer. The geothermal probes are plastic tubes with a diameter of 32 mm, which are filled with water.

By circulating water through a closed circuit, the water in the probes reaches the temperature of the ground, which is ca. 10 - 12°C. The geothermal energy is used throughout the year, for cooling of the whole building in summer by means of about 3,500 m² chilled ceilings, and in winter it is used with a heat pump to support the building’s heating system. 

In summer operation the water that circulates through the thermal probes is used directly, at a temperature of ca. 15°C, for cooling the offices without further energy-related measures. 

Because such an installation requires great planning reliability, we entered the complete building in a suitable building simulation program with which we could reproduce the necessary cooling loads per hour at appropriate positions of the sun, and determine the behaviour of the building under a range of conditions. 

Illustration: © Sparkasse Schwarzwald-Baar 

Location
Donaueschingen

Client
Sparkasse Schwarzwald - Baar

Realisation period
2001 - 2003

Area
10,500 m² gross floor area

Service phases
HOAI § 73, Phases 1 – 9

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