Solar

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Integration of Solar Thermal Energy in an Existing DH System

In 2018, the energy utility Vattenfall Wärme Berlin AG upgraded its DH system in BerlinKöpenick with a solar thermal plant. The plant was planned and constructed by the Danish
turnkey supplier of entire solar heating systems Arcon Sunmark, which now realised their first
plant in Germany. After only 10 weeks of construction the SDH plant was taken into operation
in May 2018 with a minimum expected life time of 25 years. The plant is placed right in the
area of Köpenick, surrounded by residential buildings and businesses. The collectors feed the
solar heat into the return pipe of the district heating system throughout the year, using a heat
exchanger without an additional thermal energy storage. The plant’s expected annual heat
production is 440 MWh. Within the first seven month of operation and the hot summer 2018 in
Germany approximately 500MWh were already reached.

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Solar Heating and Cooling in an Energy Efficient Residential Building

Within a privately owned residential building a variety of technologies are implemented to reduce the energy consumption. Both a solar heating system and heat pump are connected to a boiler for the heating of water. This water is used as sanitary hot water. Space heating and cooling is achieved from fan coil units (FCUs); where hot or cold water circulates inside the convectors depending on the need. Finally, underfloor heating is established through a closed water pipe system, with a heat pump as heating source. The monitoring of the entire system takes place in one control unit.

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Zero-emission Settlement in Bad Aibling

In the south of Germany a small district heating network has been installed in the town of Mietraching/Bad Aibling. The main sources of district heating are a woodchip boiler, mainly used in cold days, and solar collectors, mainly used in the warm days. The solar collectors are connected to centralised and decentralised buffer tanks for energy storage. Furthermore, a gas installation is delivering peak load for in mid-winter. The district heating network supplies heating to about 130 households, 2 schools, office buildings and a hotel.

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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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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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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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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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