Comparison of heat-plume predictions using two large-scale models of groundwater heatpump installations: FEFLOW vs. the ÖWAV-model | Vergleichende Temperaturfahnenprognose anhand zweier industriell genutzter Grundwasserwärmepumpen: FEFLOW vs. ÖWAV-Modell
2016
Steiner, Cornelia | Heimlich, Klaus | Hilberg, Sylke
The geometry of heat-plumes created by groundwater heat-pumps (GHPs) must be determined in advance to confirm if they are acceptable according to local guidelines. In Austria, an analytical model (ÖWAV Regulation 207-2) is widely-used for determining plume geometries of small GHP installations (< 10 l s⁻¹), however a systematic evaluation of the ÖWAV Model has been lacking. This study applies an analytical model (ÖWAV) and a numerical model (FEFLOW) to two large-scale industrial cooling-plants in Austria that exploit productive porous aquifers. The model comparison reveals that detailed knowledge of the input parameters, such as groundwater levels, as well as extraction and injection temperatures, is crucial for realistic heat-plume predictions. Both models provide good results for sufficiently complete data sets and simple hydrogeological settings, since the deviation of < 1 K is within acceptable limits. The ÖWAV model is not recommended for complex hydrogeological settings, due to an average deviation of 1.3 K from the measured groundwater temperature in this case.
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