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Ensuring energy security and cost- efficient heat supply

The district heating system of Brasov has gone through several transformations in the attempt to find a solution for the zones located within the urban agglomeration of Brașov. Unfortunately, the lack of vision and the misun- derstanding of the advantages of such a system, coupled with a legislation that allows for easily installing natural gas individual boilers, led to a situation where only 4% of the local population was still connected to the DH in 2014 (reference year of the project).The future of this system is directly linked to the local policies, which should be supported by the population, by the real estate developers and last but not least, by policy makers.

The current strategy is trying to provide insight into the renewable sources that could be used in the future in order to ensure energy security and cost efficient heat supply at local level.

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Geothermal energy for ensuring sustainable and affordable heating & cooling

The city of Litoměřice developed an Energy Concept in 2009 and adopted a Municipal Energy Plan in 2014. The main goal of the municipality is to reduce energy consumption by 20 % by 2030 (baseline year 2012). There are no specific targets regarding renewables (RES) in Litoměřice in the heating and cooling sector.
The city is developing a Sustainable Energy and Climate Action Plan as part of the Covenant of Mayors (www. eumayors.eu), which will define specific targets for RES.

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Ensuring energy security and cost- efficient heat supply

Helsingør developed its own Climate Plan back in 2009. The municipality is part of a regional cooperation programme aimed at developing a Strategic Energy Plan in partnership with all the municipalities in the area, and is a signatory to the European Covenant of Mayors (www.eumayors.eu).

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Developing a renewable heating & cooling system in an unfavourable context

Matosinhos’ year-round mild weather makes the challenge of decarbonising heating and cooling drastically different from more demanding climates, be it from a business-case as well as from a technical perspective.
Residential heat demand has historically been low. It is expected that the improvements in the building stock will essentially result in an increase of the indoor temperatures, which are low, and therefore will contain any pressure to increase the demand.
The growing services sector and still significant presence of an industrial sector further support them as the clear targets to address in terms of renewable heating and cooling.

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Renewable heating strategy for a new development area

This case study covers the investigation of renewable heat supply options for the new development area «Teilraum 31» in Ansfelden. The area is mainly owned by the municipality which, therefore, can define priorities regarding energy efficiency and renewable energy. The new development area could include ca. 120,000 m2. According to the current planning strategy, it will be used for different types of buildings – mainly residential ones, and could reach a plot ratio of 0,45 to 0,55 per building lot. The expected buildings consist of around 100 single-family houses, 200 row houses and 10 small multi-family houses.

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Decarbonising district heating through solar thermal energy and heat pumps

As the district heating system in Herten is currently supplied with heat from coal-fired Combined Heat & Power (CHP), the approach was to frame a potential alternative mix of centralised heat supply units with a high share of renewable energy sources. It is aimed at designing a system which is technically feasible and to compare it to the current system with regard to the heating costs.

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Seasonal Heat Storage “Am Ackermannbogen” in Munich

The city of Munich implements various policies to increase energy efficiency and to mitigate climate change. In 2007, the city of Munich realized the solar thermal heating project Am Ackermannbogen which includes 3078 m2 rooftop solar collectors, a seasonal storage tank & heat pump. The installation provides heating to 320 apartments, of which 40 – 45% solar thermal heat.

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Heat supply from a Biogas Plant in Vatersdorf

A farmer and engineer, Ulrich Bader, owns a biogas plant located close to the southern german village Vatersdorf. In 2012 he initiated and developed (with the help of a heat pipe manufacturer) a small scale district heating network to give a purpose to the heat released by the biogas plant. In combination with two wood-chip boilers and a fossil oil boiler Ulrich Bader can guarantee sufficient heating throughout the year to 85 households of the village Vatersdorf.

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Low Temperature Heating Grid in Dollnstein

Dollnstein is a small community with about 2,700 inhabitants in the heart of Bavaria, Germany. Dollnstein is located in the Altmühltal Nature Park, one of the most popular touristic destinations in Bavaria. In 2011, the municipality has initiated and in 2013/14 installed an intelligent heating network for about 40 households and several communal buildings.

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Bio-energy Village Büsingen

The village Büsingen, located in the south of Germany, has a 100% renewable heating district. In winter the biomass boiler delivers most heat, while in summer the solar park takes over as main producer of heat. A rapeseed oil boiler is available for peak loads.

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