Approaching the plus energy House a bit more!
Low-energy building, passive house, zero-energy House – is the topic of sustainability when building a house in Germany now of importance for many years. In the construction of real estate takes the energy (EnEV), which was introduced in 2002 and amended in the year 2014. 2009, the renewable energies heat Act (EEWärmeG) was also adopted. According to the regulation, sustainable raw materials must be used in new buildings, for example, up to a certain amount. Moreover, the heat lost to the outside, so the transmission heat losses exceed a certain value. Exterior walls, roofs, and also the basement must be sufficiently insulated. For these guidelines, the KfW holds Energieeinsparverordnung 100 as a reference model. Meanwhile, there are already several other increments this reference model 70 or 50 like for example the Energieeinsparverordnung. The figures represent the percentage of energy consumed when compared with the Energieeinsparverordnung 100.
Save energy with home or Massivhaus
When building a house the question of whether there should be a house or a massive House arises first of all for builders. The differences noticeable not only in the construction, which will be more differentiated in this post , but have also sustained influence on the future and lasting market value of a property. While solid houses leave much room for individual design, prefab homes are restricted here. For the construction phase is usually faster. Energy-efficient construction is possible in two forms, anyway, because important factors such as Windows with triple glazing or insulating doors can of course use both and ultimately also the shape of the House plays a role.
Low-energy houses are now standard on new buildings. Here, there are still a certain amount of energy without compensation is consumed. The passive house goes a step further and saves about 70 to 80 percent of heating energy according to this page compared to the classic low-energy building. The average heating demand is under 15 kWh per square meter of living area per year. To achieve this, emphasis is placed in the passive house mainly on an efficient thermal insulation which is a thermal transmittance of less than 0.15 W. The heat itself is about the incidence of light through a large window front on the South side generated and a ground heat exchanger.
The domestic water is heated by solar thermal energy
The WaterNest 100is a spectacular example of a such passive house that offers energy efficiency, also an unusual design, designed by Giancarlo Zema. This is highly energy-efficient not only during its use, but can be recycled in addition to 98 percent.
Zero energy plus
The zero-energy House little thinks the basic idea of the energy efficiency and characterised by that so much energy is produced with the House as its residents consume in a year. Passive House and zero-energy House are often together called, while the differences are relatively clear, as energy wissen.info shows up. While the passive house relies on passive energy and should, as far as possible to use this energy, a zero-energy House be at least energy neutral. So ambitious the idea sounds, is far the implementation is already no longer, although yet a high technical expenditure is necessary.
The EU energy labelling
First of all, a combination of efficient insulation and sophisticated ventilation system in the foreground stands like in the passive house. A heater should be here no longer necessary, in winter additional heat is generated if necessary with a solar-hydrogen system. With the help of a heat exchanger heat is extracted from the exhaust, with newly flowing through the ventilation system air is heated. Water is heated by solar panels and concludes with its own electricity using photovoltaics or wind power. Also the water needs as possible even in the zero-energy House through the treatment of storm water. All energy by heating with electricity and water and cooling should be won through the House, without requiring external power must be used. This calculation is done at the zero-energy House but only theoretically. At the end of counts, if the energy produced can compensate the consumed. It is not included, whether or not the inhabitants consume only the energy generated by in-house.
The practicability is certainly already in the offing, however, the necessary technologies and materials are always relatively expensive. A zero-energy House may be at the present time only an ambitious project with a view to the future, but so far still not economical. The construction is relatively expensive compared to a classic low-energy building, and also to the passive house. A rough estimate sets the average price per square meter to 1800 to 2200 euros. With views of the steadily decreasing costs in terms of thermal insulation, renewable energies, heating technology and the increasing need to use them too, that should change in the future. Already supported the financing of a zero-energy House by the Government, for example through heavily discounted loans from KfW or through funding from appropriate pots.
Renewable energies have become a must
The European Parliament has set 2010 new EU directives on the energy performance of buildings, to reduce overall energy consumption of the Member countries and to be, independent of fossil fuels and energy imports. All new buildings zero-energy buildings should be from 2021, for building public to the year 2019 for it used be, as here to read. Whether this can be implemented within the mentioned period of time however, is still questionable.
High energy efficiency standards
Right now, it makes sense to be aligned with the zero-energy standard, but also for individuals already in the current market is that energy-efficient homes achieve a higher price? When purchasing in particular when existing real estate eighth buyer on the standard of the House, because is a costly renovation with included and affects the price. Also, the prospect of a low energy consumption is of course very attractive for the future, because the prices for fossil fuels will increase inevitably continue, the more the sources are exhausted.
Go this way with a good conscience!
In all independence, which brings with it a zero-energy House, it is still not self-sufficient. The complete autonomy could however make a plus energy House. The requirements for such a construction are of course but still significantly higher than for a zero-energy House. In addition to the structural conditions, for example, also the location of the House plays a crucial role. For the optimum energy yield photovoltaic or solar systems have to can be placed, shade-free. This is in hindsight not always feasible particularly in existing buildings, so that plus energy House as well as zero-energy House emerge best from a new building out. A plus energy house completely draws power from renewable energy sources and supplies not only themselves, but is also surplus to the mains. A prominent example is the Heliotrope from Freiburg.
The House in the course of the day slowly turns around itself, to align themselves fully to the Sun. The necessary energy it produces for itself through a solar system on the roof. Even the composting of waste is carried out here. Through the large Windows and spacious rooms, the rooms heat up by sunlight.
In such projects, not only the individual House with its usage in the foreground, but above all the view is on a widespread implementation. Plus settlements promise not only energy independence for all regions, but also a gain in energy over the long term.
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