31 August 2021
In 2010 Xylem, in Emmaboda, Sweden, installed a High-Temperature Borehole Thermal Energy Storage (HTBTES).
The idea was to store waste heat in the summer season to use later for space heating in the winter. The system worked adequately for charging the storage, but turned out to be much less effective for extracting the stored heat. By installing a heat pump system to support heat extraction, the system now works properly both ways. This article presents the energy performance and economics of such a system.