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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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Geothermal heat sources for the DH System of Ferrara

The network in Ferrara has already achieved significant results, but represents a perfect field to test advanced improvement strategies. As of 2014 the network is 56 km long, with 591 users’ substations, delivering approximately 143 GWht/a. The energy mix is a combination of geothermal source (14 MWt), WTE (30 MWt) and gas boilers, including a significant storage system (1,200 m3). The average temperature levels are 90°C on the supply line and 60°C on the return line.

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Upgrading the performance of Sisak’s District Heating Networks

The target city of the Upgrade DH project in Croatia is the city of Sisak. It is a middle sized city located in the Sisak – Moslavina County, southeast from the Croatian capital, Zagreb. The city is the administrative, cultural and historical center of the county, as well as one of Croatia’s biggest river ports and industrial cities. Total number of inhabitants is 47,768, as stated in the 2011 population census. Out of this number, 33,322 inhabitants live in the urban settlement.

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Upgrading the performance of Middelfart’s District Heating Networks

The city Middelfart is located on Funen in the South-Region of Denmark, with around 15.246 inhabitants. Middelfart District Heating System is divided into two areas (Hessgade and Fynsgade), and are organizationally in charge of both Middelfart District Heating Area, but also Nørre Åby District Heating Area. Middelfart DH does not supply Nørre Åby, since they have their own local energy system, meaning Middelfart DH only supplies the city of Middelfart.

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Upgrading the performance of Tuzla’s District Heating Networks

The city of Tuzla is placed in North-East part of the country, with around 170,000 inhabitants. The DH system is based on cogeneration (CHP) in Tuzla’s coal-based power plant (Tuzla TPP)operated by EPBiH power utility. Tuzla TPP is the supplier of heat to both Tuzla City (220 MWth) and Lukavac city (50 MWth). In the near future, the town of Živinice is planned to be supplied with a thermal power of 70 MWth.

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District Heating Network Kortrijk

The City of Kortrijk installed a pilot heatnet at Kortrijk Weide, as a nucleus for further extensions in the city. The feasibility to install a heatnet backbone from the waste incinerator at the outskirts of the city, along the River Leie, to the city center was researched. As many building projects are taking place along the river, this would create the opportunity to connect over 1,000 households.

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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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