News and Articles
10/02/2012 | News, Newsletter April 2012
New pilot borehole storage in Braedstrup

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.

For this reason a number of tests have been carried out:
  • How manageable is the material in practice?
  • Will it damage the PEX tubes when compressed on site?
  • What is the carrying load of shells compressed to app. 60% volume?
  • Will convection occur in the lid?


The lid-construction of the borehole storage

The borehole storage is heating around 19,000 m3 of soil which is equivalent to approx. 5.000 m3 of water which has an accumulation capacity of approx. 275 MWh of heat. It is connected to the heat pump, with an input electric power of 500 kW and a delivered heat output of approx. 1.5 MW.

Inauguration of the entire system is expected around first of July 2012. As mentioned, the established storage is a pilot project. If the technology shows satisfactory results, the idea is to expand the borehole storage in connection with the final deployment of the solar system on around 50,000 m2.

Source: Per Kristensen, Director Braedstrup District Heating Company
 
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