STES—Typical Scenarios for Heat Accumulator Cooperation

The article presents an analysis of real operational data of a Seasonal Thermal Energy Storage system connected to a local heating grid. 8 years of operation time was analyzed to determine typical scenarios for cooperation with the heating grid and solar collectors. The research shows that three main working modes of the accumulator may be particularized: charging, discharging and transient modes, and that the maximum speed of charge/discharge is on average below 0.3 °C/day.