3:28 min.
Project Info: http://sdg21.eu/db/limnologen-vaexjoe
BN - Is the roof of my house or company building suitable for a photovoltaic system or a solar thermal system? This question can now be answered quickly and conveniently online with the help of the new solar roof cadastre of the city of Bonn. In a building-specific map display, a coloured marker indicates whether and to what extent a roof is suitable for energy generation by means of solar power. Step by step, further information, for example on the economic efficiency, can be retrieved via a yield calculator.
The suitability of the roofs of all 129,000 buildings in the city for solar energy generation was recalculated using the latest, improved data. For this purpose, elevation grid data was used, which was determined by the district government of Cologne by means of laser scanning in spring 2016. Compared to the previous version from 2010, the new Bonn solar roof cadastre features, among other things, a fourfold higher resolution and a more differentiated designation of the roof areas.
The suitability of the roof surfaces for electricity generation via photovoltaic systems as well as for domestic water heating and, for the first time, also for supporting building heating via solar thermal collectors was calculated. The calculations also took into account the current changes in the framework conditions with regard to feed-in tariffs and self-consumption of generated solar power.
How the application works
In the city map, the installable system size and many additional data such as yields and savings potentials can be displayed for each building. In a newly developed yield calculator, costs and yields can be calculated and compared by entering additional user-specific information such as electricity consumption or household size. In this way, every owner can quickly gain an overview of the suitability of his or her building for the use of solar energy. Detailed instructions are available at www.bonn.de/...solardachkataster.php.
The City of Bonn points out that the information from the solar roof cadastre is an initial non-binding assessment. Essential prerequisites for a decision to build a system, such as the condition of the roof or the static suitability, can only be clarified by suitable specialist companies or qualified consulting organisations. Information on this can be found on the website of the solar roof register.
Bonn roofs have potential
According to the potential analysis of the solar roof cadastre, 6,800,000 square metres in Bonn are suitable for solar power generation. This corresponds to about the size of 950 football fields. Approximately 800,000 megawatt hours of electricity could be generated on this area. This could cover about 50 percent of the total electricity consumption in Bonn. For solar thermal energy, the result of the potential analysis shows 88,461 buildings in Bonn that could be used for this form of energy generation. This corresponds to about 70 percent of the buildings in Bonn.
Link:
www.bonn.de/...solardachkataster.php
Keywords:
Stock, Blogs & Portals, Bonn, DE-News, Renewable, Climate protection, Tenant electricity, News Blog NRW, PV, Quarters, Settlements, Solar thermal
On 18 June 2020, the German Bundestag passed the Building Energy Act (GEG) in its third reading. With this law, the federal government is combining the existing requirements of the Energy Saving Ordinance (EnEV), the Renewable Energies Heat Act (EEWärmeG) and the Energy Saving Act (EnEG). For the information programme Zukunft Altbau (Future of Old Buildings), which is supported by the Baden-Württemberg Ministry of the Environment, the specifications of the new law are not ambitious enough. To bring climate-friendly building and renovation nationwide on the way is not possible in the future. "The legislator has missed it to introduce more demanding standards," says Frank Hettler of Zukunft Altbau. "For a sustainable building stock in Germany, however, these are urgently needed to achieve the climate targets." The GEG will now be forwarded to the Bundesrat, which, however, does not require approval, and is expected to come into force by the end of the year.
The Building Energy Act brings together the previously inconsistent specifications for energy requirements for existing buildings and new buildings as well as the use of renewable energies. "Unfortunately, the opportunity to simplify, reduce bureaucracy and take climate policy necessities into account is not being seized," criticises Hettler. "With the GEG, almost nothing changes for building owners. This is a problem: the climate policy goals of the federal government and the EU, as well as the Paris Climate Agreement of the UN, cannot be achieved in this way. The goals for the building sector defined by the federal government in the Climate Protection Plan 2050 will be missed with the legal requirements if those willing to renovate are guided by them."
Important course missed
If Germany wants to achieve the climate protection targets it has set itself, new buildings and refurbishments must be significantly better in terms of energy than the GEG requires. Otherwise, in addition to the necessary purchase of CO2 certificates and high compensation payments to more exemplary EU neighbouring countries, there is also the threat of decades of lock-in effects. After all, once insufficient insulation thicknesses have been installed, they can no longer be improved economically. Buildings constructed or refurbished in accordance with legal requirements would therefore have to be refurbished again at a disproportionately early stage in order to meet future standards and climate protection requirements. If, on the other hand, they are not refurbished, this means high long-term expenses for the owners in the form of energy costs and CO2 pricing.
In accordance with European law, the next review of the GEG will not take place until 2023, when the energy standards for residential and non-residential buildings are to be further developed. In plain language, this is a further delay of several years. These long, unused periods of time, combined with the minimum standards that have been set too low - especially for renovations - are far from adequate for the building sector to make an appropriate contribution to averting the climate crisis.
Better promotion provides important support
Building owners should therefore not only adhere to the GEG specifications, but also tackle new construction and renovation with an eye to the future, recommends Hettler. The financial subsidies that have been greatly improved since this year, for example from the KfW development bank, are helpful in this respect. As a rule, they compensate for the additional costs incurred for construction measures on the building envelope. Since the beginning of the year, the Federal Office of Economics and Export Control (BAFA) has been awarding extensive financial subsidies for the replacement of heating systems - especially existing oil heating systems - if renewable energies are used and legal standards are exceeded.
Conclusion: Those who rely on ambitious, individually tailored energy concepts will save money in the long run - and also protect the climate, advises Hettler. In accordance with this requirement, it is advisable to use at least the KfW Efficiency House Standard (EH) 40 as a basis for new buildings and at least EH 55 as a standard for extensive renovations. To simplify the integration of local renewable energy sources such as geothermal or solar thermal energy, it is also advisable to switch to low-temperature heating systems - provided there are no restrictions such as listed buildings.
Neutral information to questions approximately around the energetic reorganization gives it also free of charge at the consulting telephone of future old building under 08000 12 33 33 (Monday to Friday from 9 to 13 o'clock) or by E-Mail to consultingphone(at)zukunftaltbau.de.
Up-to-date information on the energy-efficient refurbishment of residential buildings is also available at
www.zukunftaltbau.de
Background
Zukunft Altbau provides neutral information to home and building owners about the benefits of energy-efficient renovation and promotes qualified and holistic building energy advice. The information programme, which is funded by the Baden-Württemberg Ministry for the Environment, Climate and Energy Management, provides neutral, interdisciplinary and free advice. Zukunft Altbau is based in Stuttgart and is implemented by KEA Klimaschutz- und Energieagentur Baden-Württemberg.
Keywords:
Stock, DE-News, Quarters, Settlements, Environmental policy, Housing, Housing policy
Strengthen energy refurbishment of buildings and demand responsibility from landlords.
Housing policy must create supportive framework conditions and thus contribute to the reduction of living space.
"For a necessary energy turnaround in the housing industry, conditions must be created that demonstrate noticeable incentives for owners and users to consume less energy in the future," says DAI President Dipl.-Ing. Architekt Arnold Ernst. On the occasion of the Federation Day of the German Associations of Architects and Engineers (DAI), a declaration on current topics of building and planning culture is published in annual succession. For previous DAI statements, see below.
In Germany, CO2 emissions from buildings are equivalent to the pollution caused by traffic. The intensity of the public discussion does not reflect this. This is all the more reason why architects and engineers are called upon to show responsibility in their field and to demonstrate ways in which they intend to make their contribution to sustainable climate protection.
The technical solutions are available, and we need to develop better methods, especially for the sustainable retrofitting of existing buildings. However, there is a lack of incentives for owners and users to implement and tolerate energy-efficient refurbishment. It is easier to demand climate protection than to pay for it. The environmental impact of CO2 emissions is (still) free, but avoiding it costs money, a lot of money in existing buildings. The landlord shies away from the investment because only a small part can be passed on to the rents. The tenant has an understandable insistence on not changing the size and location of his flat, especially as long as the parties keep deciding on new socially undifferentiated benefits in the competition for the cheapest rents. Both landlords and tenants must make their economic contribution in order to finance the comprehensive energy-efficient refurbishment of the housing stock.
The benchmark for all participants must be the Polluter pays principle be. Those who contribute to the release of CO2 must have an economic advantage if they actively participate in the reduction; those who refuse to participate must have an economic disadvantage as a result.
The DAI demands:
Both levies make it more expensive to live in buildings that are not optimised in terms of energy efficiency. Weighing up the direct financial burden on those affected and the long-term burden of climate change, the DAI considers the additional costs incurred to be justified. Support for economically weak households in line with the social market economy must ensure that the entitlement to adequate housing is met.
As appropriate in the sense of social indigence 30 sqm per person + 20 sqm for each additional person in a dwelling are considered. Appropriate transitional periods should on the one hand avoid social hardship and on the other hand continuously stimulate stronger incentives for the adaptation of housing conditions to economic performance. In order to also stimulate the corresponding adjustment processes above the level of social need, the regulation of the rent level should be waived, but in the case of existing tenancies with an appropriate limitation of the annual increase, also in order to facilitate the adjustment to economic performance.
DAI Presidium
Note sdg21: the statement presented here does not reflect the opinion of the sdg21 editorial team.
Keywords:
Stock, DE-News, Renewable, Climate protection, Affordable housing, Housing, Housing policy, Thermal insulation, Ecology
8:08 min., 12.07.2010, image video
Project Info: http://sdg21.eu/db/muenchen-riem
Keywords:
DE-News, Movies, Movies 4 to 10 Min, News Blog Bavaria
