Renewable energies
I. Development and resources protection by renewable energies possible
The climatic change is dramatic, but renewable energies and the climatic protection can hold up the ever faster progressing heating of the terrestrial atmosphere.
The world climatic report of the UN- climate -Committee IPCC submitted today recognizes for the first time explicitly on, what in the science in the meantime is so well undisputed:
Humans are responsible for the climatic change and its consequences such as melting of the glaciers, rise of the sea level, inundations and eddy towers.
The greenhouse gases contribute the largest part in addition by the burn of fossil sources of energy for the production of current, warmth and fuels.
Only the energy-conditioned CO2-emission amounted to in the past year world-wide approx. 27 billion tons. However world-wide 7 billion tons of CO2 were saved by renewable energies to 2006. However in Germany saving amounts to 100 million tons of CO2.
To 2012 it should be already 120 million tons.
Renewable energies have today a portion of 20 % of the global final energy consumption of current, warmth and fuels. They represent the only world-wide available and safe alternative to the fossil sources of energy oil, gas and coal. The fact that transferred is possible shows recently the study presented of Greenpeace and EREC "energy evolution". Therefore the CO2-emission can be halved up to the year 2050, if energy efficiency is seriously taken and the climatic neutral and infinitely existing renewable energies world-wide substantial on 50 per cent of the energy consumption are developed.
II. Optimization of energy costs, building cover and equipment technology
The first and most important step for reorganization or a new building project is before beginning of the building phase the optimal selection of the source of energy (fuel), the thermal insulation and the heating system.
In this preparatory phase you decide on your future heating energy costs, a comfortable indoor climate and lot more.
We support you with the selection of the optimal source of energy and inform you about possible solutions, so that you can make the correct decisions first without risk.
We inform you over:
- Conveyances, laws, standards, background, novelties
- Energy saving regulation,
- Energetic connections and terms
- Thermo protection at buildings, meaningful building and isolates
- Conveyance for renewable energies of federation and countries
- Controlled dwelling ventilation with heat recovery
- Avoidance of dampness damage and mould
- comfortable dwelling climate
The goal of the EnEV
Naturally with energy saving measures also the environment is preserved.
Thus the space heating and the warm water constitute for instance a third of the entire primary energy need in the Federal Republic in Germany.
The largest consumers are thereby the private households.
In order to reduce the environmental impacts developing from it and to preserve the limited availability of fossil fuels, must energy from oil, gas and coal efficiently be used and renewable energies strengthened be used .
The energy saving regulation (EnEV) regulates thus no more the heating heat requirement, but the primary energy need, which is necessary for the drinking water heating up for the building heating and ventilation as well as.
The EnEV requires regarding heat damming and also configuration-technical measures as a whole. In addition computation methods belong and naturally concrete energy saving measures in the building. For most measures, which are planned by owners in the context of the EnEV, promise European Union, federation, countries and municipalities a worthwhile promotion.
III. Energetic connections and terms
The yearly heating heat requirement is the additional annual heat requirement necessary for the heat gain, in order to hold a building on a desired temperature.
Effective energy conservation is possible only by a measure combination of equipment technology, building cover and source of energy.
The yearly heating heat requirement depends on:
- Building cover: Thermal insulation, hermetic ness, cold bridges
- Equipment technology: Heating, ventilation, heat recovery, water heating
- Source of energy: Fuel oil, gas, river, renewable energies (solar, wood, ...)
Estimation of the annual heating heat requirement and the specific heat requirement:
Energy consumption condition kind
Requirements of the annual heating heat energy need in the comparison:
Existing buildings FRG, conditions 1979 |
 |
220 to 270 kWh/m²a |
KFW 40/60 houses (NEH), kind of low energy condition
Buildings according to this kind of condition use above all little heating energy. Single family houses are per year with 30-60 Kwh/m²a and multi-family house about 30-50 Kwh/m²a.
The specific heating energy-need depends on the building method of the house, in the special one on the thermal insulation. The heating energy-need of a NEH is to 20-25% under the requirements of the WSchV'95.
To this kind of damming and in the EnEV as new kind of condition one specifies.
• For the structural thermo protection the following values are not to be exceeded after EnEV:
External wall |
|
U ≤ 0.40 W/m²K |
Construction unit |
|
Losses of energy |