Reportage of the city of Berlin "Resource-efficient building with concrete, gypsum, brick and wood".
Published
19:09 min, Published on: 18.11.2020
Dwindling raw materials, dwindling landfill space and ambitious climate protection targets make it essential to overcome the high use of resources in the construction industry. The film shows that there are already many ways to use building materials sustainably in the cycle: Recycled concrete, recycled gypsum, the reuse and recycling of bricks and the renewable raw material wood.
Around 60 percent of the resources used in Berlin are processed in the construction industry. This contrasts with millions of tonnes of building rubble and construction site waste. Every year, 2.2 million tons of primary raw materials are already saved in civil engineering and building construction in Berlin through the use of quality-assured secondary raw materials. But Berlin does not intend to stop there. By 2030, a further 1.4 million tonnes of primary materials are to be replaced by secondary raw materials each year.
Video: Gretchen Agency GmbH/EUMB Pöschk GmbH & Co. KG/Ute Czylwik
Publisher: Senate Department for the Environment, Transport and Climate Protection
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.
Since January 2017, building owners who have a residential building constructed and certified in accordance with the requirements of the DGNB have the opportunity to receive a grant for construction support from KfW. This covers 50 percent of the eligible costs up to a maximum of 4,000 euros per building project.
The grant is linked to the KfW product "Energy-efficient construction and refurbishment" and can relate to various services within the scope of DGNB certification, such as auditor services, specialist planning and the performance of measurements of indoor air quality or air tightness.
KfW is looking for builders who are thinking about tomorrow. The 2017 motto is: "Expand, extend, convert - create and modernise living space efficiently".
Apply now until 1 March 2017 and win prize money worth a total of EUR 30,000.
Germanwatch now urgently expects political signals following the conclusion of the interim technical negotiations / Special challenge on the issue of damage and loss recognised, now it is a matter of concrete financing proposals
Bonn (16 June 2022). The results of the ten-day interim negotiations that ended today in preparation for the World Climate Conference in November do not do justice to the urgency of the climate crisis, criticises the environment and development organisation Germanwatch. "The interim negotiations were a technical process of small steps. This does not fit the crisis situation the world is in. It is now up to political decision-makers to translate the preliminary work into big steps," says David Ryfisch, Team Leader for International Climate Policy. "Trust is the foundation of a successful negotiation process. However, this has eroded due to past implementation and financing promises that have been broken. If the new negotiation processes are to be successful, there now needs to be a clear vision from the Egyptian Presidency of the upcoming climate summit on where the journey should go," Ryfisch continues.
Insufficient progress on climate protection endangers 1.5 degree limit
The new climate change work programme is intended to help close the gap in implementing the 1.5 degree limit in this crucial decade. Considerable resistance to clearer steps came from China, Saudi Arabia, India and Brazil. "The major emitters among the emerging economies are resisting being forced to act on climate protection. This is also a reaction to the fact that many of the rich countries of the Global North have not kept their climate protection and financing promises for years," says Ryfisch. In the US, for example, the government is failing to back up its internationally pledged targets with legislation and budgetary resources. The EU, on the other hand, has today issued a declaration on the promotion of fossil gas with Egypt and Israel, after Chancellor Scholz has already been to Africa with the same goal.
"The ambiguity in the European response to the Russian war of aggression in Ukraine makes international partners question the seriousness of the energy transition. The EU and the German government must not sow any doubts globally - this also means not driving African states into a dependence on fossil energy sources whose expiry date is known. This would be a breach of promises made at the last climate summit in Glasgow and at the G7," Ryfisch explains.
Funding to support the most vulnerable
Financial support for the poorest and most vulnerable to deal with damage and loss from climate change has been blocked for years. "There is small progress here. For the first time, all negotiating parties have accepted without ifs and buts that the need for support is real," says Ryfisch. However, due to the lengthiness of the process and past experience, this does little to change the great frustration on the part of the developing countries.
"With the ministerial declarations of the past weeks, the German G7 Presidency has contributed to the fact that industrialised countries are now finally willing to talk about financing for damage and losses. But talking is not enough, concrete pledges of support are now needed. It is up to Chancellor Scholz to put money for a global umbrella for the most vulnerable on the table at the G7 summit at the end of June and then to form a coalition of the willing at the Petersberg Climate Dialogue in July to finally get concrete aid underway," Ryfisch demands.
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KfW is looking for builders who are thinking about tomorrow. The 2017 motto is: "Expand, extend, convert - create and modernise living space efficiently".
