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Prediction of Long-Term Operational Conditions for Single-Well Groundwater Heat Pump Plants
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Abstract
When using groundwater as a primary energy source in combination with heat pumps, the groundwater is pumped from the groundwater zone, cooled in the heat exchanger of the heat pump, and then reinjected into the groundwater zone.
The design of traditional groundwater heat pump plants is based on the use of a separate pumping and reinjection well. An alternative design is to use a single-well for both pumping and reinjection. However a minimum distance between well screens is required in order to prevent break-through, caused by short-circuiting of the cooled groundwater.
The present paper describes a simplified mathematical model to be used to analyze steady-state operational temperature conditions for a single-well groundwater heat pump plant. The model is based on a finite element solution of the temperature distribution in the pumping and reinjection zones of the groundwater reservoir.
Furthermore, a model for the calculation of the ratio of the vertical to the horizontal permeability is presented in the paper. This ratio is one of the important parameters in the design of a single-well groundwater heat pump plant.
Both models have been tested against data from a full-scale experimental plant on the campus of the Technical University, where the hydrogeological conditions are familiar. The results of a comparison between model predictions and experimental field data are included in the paper.
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Citation
Sørensen, S. and Reffstrup, J., "Prediction of Long-Term Operational Conditions for Single-Well Groundwater Heat Pump Plants," SAE Technical Paper 929157, 1992, https://doi.org/10.4271/929157.Also In
References
- Qvale B. Sørensen S. N. Ibsen L. S. 1989 “Aquifer Thermal Energy Storage. Status and Future Prospects” CLIMA 2000 Sarajevo, Jugoslavia
- Qvale B. Ibsen L. S. “The Danish Aquifer Energy Storage Project. Operational Experience” JIGASTOCK 88 Versailles, France 1988
- Hoyer M. C. Walton M. Kanivetsky R. Holm T. R. “Short-term Aquifer Thermal Energy Storage Test Cycles, St. Paul, Minnesota, U.S.A.” ENERSTOCK 85 Toronto, Canada 1985
- Yong-fu Sun Qin-fen Li Ji-hong Wu “The Experiment of Storing Cold and Warm Water in Aquifer in Shanghai P.R. China and its Effect” THERMASTOCK 91 Scheveningen, The Netherlands 1991
- Eriksson A. Johansson S. “Experience from the Aquifer Thermal Energy Storage System at SAS Frösnavik Office, Sweden” THERMASTOCK 91 Scheveningen, The Netherlands 1991
- Sørensen S. N. Reffstrup J. Qvale B. “The Development of Danish Legislative Guidelines and Design Rules for Utilisation of Groundwater in Heat Pumps.” Association of Hydrogeologists, Memoires of the 18th Congress: Hydrogeology in the Service of Man Cambridge, UK 1985
- Sørensen S. N. “The Establishment and Operation of Groundwater-Based Heat Pump Systems” Laboratory for Energetics The Technical University of Denmark 1991
- Myers G.E. “Analytical Methods in Conducting Heat Transfer” McGraw-Hill 1971