PE-X Borehole Heat Exchangers for High Temperature UTES Applications

Seasonal storage at temperatures up to and even above 90°C (~200°F) is an important component within large solar district heating plants.

Depending on the geology and storage capacity different types of seasonal underground thermal energy storages can be identified, e.g. underground water pits, borehole storages or aquifer storages. Because of promising economy and technical advantages, borehole storage was applied in several cases.

This paper describes an UTES application utilizing the outstanding properties of cross-linked Polyethylene (PE-X).