Taking a holistic view – from building shell to energy sources

For its new construction projects, Deutsche Wohnen uses tailored, integral energy concepts which rest on a holistic approach to considering and planning the energy supply.

“There’s a good reason for that,” as Christian Pfeuffer says: “It enables a solution to be developed for each site which is the perfect fit in technical, economic and ecological terms.” The team leader from the Energy Management unit at Deutsche Wohnen Beschaffung und Beteiligung GmbH adds: “That’s essential because the parameters are different in every district – both with respect to technology and, for instance, the tenant structure.”

The new construction project in Potsdam-Krampnitz is a good example of one such integral energy concept. In conjunction with the Potsdam authorities, Deutsche Wohnen is building a sustainable neighbourhood with approximately 1,400 apartments on the site of a former barracks. It will form part of a new city district for some 10,000 people. The integral energy concept is based on a CO2-neutral, fossil-free energy supply. The new energy centre will consist of CHP plants, heat pumps, electrode boilers and conventional boilers for peak loads. In addition to this, there will be low-temperature district heating networks, photovoltaic systems, ground-mounted solar thermal collectors on the outskirts and thermal reservoirs outside the energy centre. There are even plans to utilise the heat from effluents.

The Marienhain district in Berlin-Köpenick is another example. Construction work is due to start there in 2020 to create a whole new residential complex with a total of 63 buildings and approximately 1,200 apartments on a 150,000-sqm site on the banks of the River Dahme. Heat for the property will be produced by a central cogeneration plant. The facility will achieve a primary energy factor of 0.5 thanks to an efficient combination of a CHP plant with an electrical output of 2 × 400 kW supplemented by state-of-the-art condensing natural gas boilers in a cascade system. Generating heat and electrical power at the same time saves some 700 tonnes of CO2 a year compared to a conventional gas condensing system. From the central cogeneration plant, the heat is distributed via a district heating network to 27 sub-stations, which in turn supply the various building complexes. The systems are monitored by means of a central building control system using LAN cables. In addition, the system parameters of all heat generation plants and supply points are recorded digitally and controlled systematically by a monitoring system. As a result, the property’s supply system is optimally tailored to its energy requirements and meets the very latest ecological and economic standards.

The primary energy factor shows how much primary energy is consumed to generate a unit of energy which can actually be used, e.g. for heating.

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