This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 691624
The Breadstrup District Heating Company is now extending its solar plant, and implementing a pilot borehole storage system, as a first step towards achieving their goal: 50% of the heat production covered with solar.
The pilot borehole storage system is now established with 48 pcs. 45 m deep boreholes. In these holes 2 parallel heating hoses are embedded, each of which connects 6 holes before they are connected in a connection well. The lid of the borehole storage is constructed with several geo textiles and roof foils and mussels shells have been chosen as the isolation material.
Denmark has a large production of mussels and the shells are a waste product, which is used for soil improvement etc. They have however also been tested for insulation purposes and found to have reasonable heat conduction values of 0,112 W/mK (crushed to 60% volume) and 0,12 W/mK (whole). The price is app. 10 €/m3 delivered only. The material has been tested for insulation of floors and roofs in alternative house designs, but has not been used before for purposes similar to the actual.
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