Erlangen 2018 – wissenschaftliches Programm

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AKE: Arbeitskreis Energie

AKE 1: Energiewende in the Earth’s Solar Belt

AKE 1.2: Hauptvortrag

Montag, 5. März 2018, 11:00–11:30, B 0.014

Aquifer thermal energy storage systems ensuring continuous cooling in arid climates compared to applications in Europe — •Felina Schütz, Gerd Winterleitner, Christian Wenzlaff, and Ernst Huenges — GFZ Potsdam, Germany

About half of the electricity consumption in Oman is used for cooling. Therefore, low electricity consumption technologies are investigated with the components solar heating, absorption chiller, and heat storage systems. In an aquifer thermal energy storage (ATES) energy is stored in groundwater horizons via hot (or cold) water injection. In general, an ATES system is designed as a doublet consisting of a warm and a cold well which simultaneously inject and extract water, respectively. This storage system was successfully demonstrated at the German Parliament Buildings in Berlin. There, the ATES is charged with surplus heat in summertime. In wintertime, the ATES is discharged to supply the buildings with heat (45°C and 30°C for flow and return). In an aride climate such a storage system can be used to support thermally driven cooling comprising of an absorption chiller which requires driving temperatures of 70*140°C, provided by a solar thermal plant. The stored energy can be used as auxiliary energy during peak demand and night times when no solar energy is available. This requires daily charging and discharging cycles which is in contrast to seasonal ATES applications in Europe. A further special challenge in the harsh climate of Oman is the cold side of the absorption chiller. As part of the low electricity consumption chiller technology concept of this study we analyze heat rejection to the underground at the site in Oman.