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Optimizing operation strategy for geothermal cascade utilization heating system using calibrated full-performance model
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DOI：10.1016/j.jobe.2024.111448.png)
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Abstract
En 中文
Geothermal cascade utilization heating systems provide efficient and clean heating through direct heat exchange and indirect heat extraction by heat pumps. Optimizing the operation strategies of such systems is challenging due to equipment interdependencies and the difficulty in converting optimized passive variables, like flow rates, into practical control strategies. This study aims to address these challenges by constructing a full-performance simulation model of the system in Modelica. Seven engineering-executable variables (such as outlet water temperature set point of heat pumps, water pump frequency, and number of operating heat pumps, etc.) are co-optimized under the Modelica-Genopt coupling framework. The results demonstrate an increase in the average COP from 4.41 to 4.74. Compared with the baseline strategy, the optimized system achieves an energy saving of 13.55 % and a cost reduction of 9.92 %. Additionally, this study explores the impact of geothermal water costs on the operation strategy. It is found that increased costs lead to higher geothermal water utilization efficiency, from 75.62 % to 81.34 %, by reducing deep well pump frequency and earlier heat pump activation. Overall, this research provides directly applicable operational strategies that enhance the sustainable utilization of geothermal resources and the economic efficiency of the system.
Keywords:
Geothermal energy
Cascade utilization
Operation strategy optimization
Heating
Journal
IF:
7.4
Papers:
1.6W
Citations:
6.6W