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The key points in brief:
• Around 220 borehole heat
• exchangers at a depth
• of approx. 280 meters
• “Heating/cooling battery”
• in the ground
• Central energy supply
• Investment through
• contracting partner
Two underground energy centers will be set up for the entire area. Each center has a separate heating and cooling generator. The source of both these energies is the fields of borehole heat exchangers. In its final form, this will consist of six partial fields with around 220 heat exchangers in total, each at a depth of approximately 280 m. Four of the fields will be placed under the green areas and the remaining two under the parking structures. By means of these heat exchangers, in winter warmth can be retrieved from the ground using heat pumps. In summer, the waste heat can be returned to the ground (by means of free cooling or cooling machines on the heat exchanger fields). The ground under the area thus functions as a giant thermal battery.
The entire heating and cooling requirement can be covered by the borehole heat ex-changers. Depending on the customers’ needs, sustainably produced green electricity can be used for the heat pumps and cooling machines in order to qualify for the appro-priate labels, such as Minergie. A condensing oil-fired boiler is available as a backup in case of any peaks.
A balanced relationship between heat and cold usage is important for the “thermal earth battery” to work. Depending on the required usage, any deficiency in the heat input can be balanced by means of thermal solar power plants. Conversely, an oversupply of waste heat can be returned to the environment using conventional recooling units. The additional measures required for this are to be borne by the party responsible.
The two energy supply centers can be im-plemented independently of one another or simultaneously, depending on the development schedule for the overall area. Following construction of the energy centers and shell construction of the first construction sites, the borehole heat exchangers will be sunk in the green area. At the same time, the energy systems will be installed.
This means that, before the first stage of building construction is complete, heat can be procured for drying the building. Before building of the parking structures can be started, the borehole heat exchangers under the building need to be implemented. The borehole heat ex-changers in green areas B and C will be implemented at a later date, depending on the energy requirement, and connected to the centers.