Thus, the builders had not counted in Heidelberg when she 2008, the project “Rail City” started. The area near the main railway station, which, like a drop of water clings to the railroad was enlivened – by thousands of reptiles. “We had to move 3000 lizards,” says Peter Dohmeier, managing director of the development company Heidelberg (EGH). Dohmeier and his team were only considered from a few hundred animals. Only then the machines were rolled down and the “Rail City” gradually got into a face.to 12,000 people by 2022 on the 116-acre site is located. The first moved in in June 2012. Today, there are already more than 1,400 residents – all live in virtually energy self-sufficient Passive Houses . They are significantly more expensive than conventional buildings. This is due to their special construction. For this, they use only a fraction of the energy that is not consuming energy upgraded Houses . This will play the higher construction price back inside. FOCUS Online explains what you must consider when construction of a passive house , how much more it will cost after how many years additional expenses are profitable and where there is aid money .
The energy saving program
insulation, windows, heat, Renewable Energy: How can summarize the energy conservation program will be built on the basis of passive houses. Also in Heidelberg it is used. In the “Rail City” thick insulation are the houses in a layer of 20 cm packed. For other buildings of this type, it can even be 40 inches at the. Among them is an airtight envelope. . The desired effect: Cold air can not penetrate
In addition, the windows are so arranged that as much sunlight falls into the room and heats it – for free. The apartments in the “Rail City” feature on its south side with huge windows. Take nearly a the entire front. On the north side, on which it is often shady, dei same window, however loopholes. It acts as if the residents just so push their heads through the hatches. At least triple glazing keeps the heat inside the house
Aerial view of “Rail City” from the November 2013
The heat inside comes from several sources:. Solar energy, waste heat of humans and domestic animals as well as electrical appliances and lighting. A heat exchanger ensures that the temperature remains relatively constant Spent and warm air flows through the ventilation system to the outside, fresh and cool air flows in the reverse direction in the house. In the heat exchanger, the two currents meet: The used air warms the fresh on – the heat is thus practically recycled and leaves the house not
waiver of Solar Energy
The result:. In a passive house must be practically not heated. “Overall, these homes require only a tenth of the energy used by a conventional construction,” says Benjamin Wünsch by the Passive House Institute in Darmstadt. “The rest can be covered without problems
renewable energy such as solar energy.” An energy autarkic house is possible.
“Rail City” in Heidelberg but dispenses with solar panels on the residential complexes. The flat roofs are green and planted. There is no capacity for solar installations. And on the facades? “There were indeed plenty of room,” says Hans-Wolf Zirkwitz, Head of the Heidelberg Environmental Protection Agency. “However, panels for facades are quite expensive.” That’s why relates the “Rail City” the necessary energy from a district heating power plant. The transport of heat energy to the houses via a heat-insulated pipe system