In a press release, Germany's Deputy Ambassador to Kosovo, Matthias Conrad, is quoted as saying: “Germany has supported Kosovo in its transition from coal to sustainable energy and decarbonisation in accordance with the objectives of the Green Agenda for the Western Balkans". The EUR 80 millio Contact online >>
In a press release, Germany''s Deputy Ambassador to Kosovo, Matthias Conrad, is quoted as saying: “Germany has supported Kosovo in its transition from coal to sustainable energy and decarbonisation in accordance with the objectives of the Green Agenda for the Western Balkans". The EUR 80 million CapEx is being financed by two grants from the German government through KfW and the European Union worth EUR 31.6 and EUR 21.5 million, respectively. The EBRD will cover EUR 23.2 million with a loan.
The KfW has also financed the feasibility study that is about to be completed. An experienced team of heat network experts from the iC group and Solid Solar Energy Systems – both from Austria – has put all their knowhow together to adapt the Big Solar concept to make it suitable for Pristina.
"We have already supported Termokos, the utility company in Pristina, on its modernisation path since 2012", said Felix Eckert. He is a district heating specialist at CES clean energy solutions – a partner of the iC group and initiator of the Big Solar Pristina project.
The term Big Solar was first used for a solar district heating project planned for the Austrian city of Graz back in 2016. The concept has been already applied in the Danish towns of Dronninglund, Gram and Vojens. It refers to solar district heating systems that store surplus solar energy from the summer in seasonal storage for heating purposes in winter. As the scheme above shows, the solar circuit starts at the bottom of the seasonal storage where you find the lowest temperatures and ends at the top of it.
However, what is special about Big Solar Pristina is the fact that the district heating network is completely switched off in the summer months, so that all the solar heat from the summer is temporarily stored in the seasonal storage for the heating period.
Scheme for the solar district heating plant, which will be connected via a 4.2 km pipeline (pink line) with the city of Pristina. A branch line of 1.6 km (purple line) will connect the seasonal storage with the CHP block. Graphic: CES clean energy solutions
One key component in the Big Solar concept is the absorption heat pumps. They perform two important functions. On the one hand, they heat up the water from the seasonal storage tank if it does not meet the demand of the supply line for the heating network.
On the other hand, the absorption heat pumps extract additional energy from the return flow of the heating network before it enters the storage tank. In this way, lower layers of the storage tank remain relatively cool. At the same time, the absorption heat pumps raise the temperature of the return flow to the required level to be re-fed into the network.
"With the Big Solar concept we can reach high solar shares in district heating grids with high temperatures", summarised Christian Holter from Solid, regarding one of the advantages of the concept. The other advantage is that the seasonal storage offers the opportunity to integrate further alternative energy sources, for example heat from the CHP plant or power to heat.
"What is special here is that the absorption heat pumps draw their drive heat from the transport line between the power plant and the district heating system. This is technically much more demanding than if there were a peak load boiler supplying the heat to the heat pumps," said Eckert.
According to a project description drafted by Termokos, the design and planning phase will start in 2023, followed by the tendering and construction phase. The utility company expects the commissioning of the SDH plant by the end of 2027. The primary operation period of the facility is calculated as 25 to 30 years.
Websites of organisations mentioned in this article:CES Clean Energy Solutions: https://ic-ces.at/IC Group: https://ic-group /en/homeSolid Solar Energy Systems: https:// banking group: https:// Bank for Reconstruction and Development: https://
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