Novel polyolefinic materials for pit thermal energy storages

Description

Pit thermal energy storages (PTES) enable the combination of various renewable energy sources, increasing the flexibility of the energy system. Working as a buffer storage, the recently commissioned PTES in Høje Taastrup (Denmark) is connecting several heat producers and consumers. 25 annual energy utilization cycles and an operating temperature of 90°C are envisaged allowing for a higher energy density. A key element of such higher temperature PTES is a liner with an improved endurance temperature. Hence, novel liner materials were developed and screened in a highly accelerated manner. The implemented testing methodology is based on elevated exposure temperatures and miniaturized specimens. An acceleration factor of up 20 was achieved for polyolefinic liner formulations. To determine the endurance time tensile testing, thermal analysis and IR-spectroscopy was performed on micro-specimen exposed to hot air or water. At a constant temperature of 90°C and a liner thickness of 3 mm a lifetime of 25 years was estimated for the best performing PP-HTR liner material.

Period	10 Apr 2024
Event title	International Sustainable Energy Conference ISEC
Event type	Conference
Location	AustriaShow on map