Evaluating the thermal impacts and sustainability of intensive shallow geothermal utilization on a neighborhood scale: Lessons learned from a case study

Meng, Boyan; Vienken, Thomas; Kolditz, Olaf; Shao, Haibing

doi:10.1016/j.enconman.2019.111913

Cited by 45 publications

(17 citation statements)

References 35 publications

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“…Cologne is one of few cities where extensive groundwater temperature (GWT) monitoring has been performed since the 1970s [61][62][63] with an urban underground temperature anomaly of up to 4 K reported already in 1974. These early works date back more than three decades before the term SUHI was phrased [2] and are backed up by a variety of recent studies [5,35,[64][65][66][67][68][69]. We demonstrate how the thermal field develops and how the urban aquifer is charged by anthropogenic heat emission and climate change.…”

Section: Introductionmentioning

confidence: 87%

The evolution of the geothermal potential of a subsurface urban heat island

Hemmerle

Ferguson

Blum

et al. 2022

Environ. Res. Lett.

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Meeting the rising energy demands of cities is a global challenge. Exploitation of the additional heat in the subsurface associated with the subsurface urban heat island (SUHI) has been proposed to address the heating demands. For the sustainable use of this heat it is crucial to understand how SUHIs evolve. To date, there have been no comprehensive studies showing how temperature anomalies beneath cities change over time scales of decades. Here, we reveal the long-term increase of temperatures in the groundwater beneath Cologne, Germany from 1973 to 2020. The rise in groundwater temperature trails atmospheric temperature rise in the rural areas and exceeds the rise in atmospheric temperature in the urban center. However, the amount of heat that is currently stored each year in the thin shallow aquifer reaches only 1% of the annual heating demand. The majority of the anthropogenic heat passes by the vertical extent of the aquifer or is discharged by the adjacent river. Overall the geothermal resource of the urban ground remains largely underused and heat extraction as well as combined heating and cooling could substantially raise the geothermal potential to supply the city’s demand.

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Section: Introductionmentioning

confidence: 87%

The evolution of the geothermal potential of a subsurface urban heat island

Hemmerle

Ferguson

Blum

et al. 2022

Environ. Res. Lett.

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“…The BHE model implemented in OpenGeoSys software has previously been verified against analytical solution by Chen et al (2020bChen et al ( , 2021 and monitoring data from actual projects in Europe (Meng et al, 2019;Chen et al, 2020a). The related calculation model is proved to be of the capability to reproduce the variation of long-term heat extracting performance for the DBHE system.…”

Section: Model Verificationmentioning

confidence: 96%

Long-term Performance Evaluation and Economic Analysis for Deep Borehole Heat Exchanger Heating System in Weihe Basin

et al. 2022

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To reduce carbon emission and achieve carbon neutrality, deep geothermal energy has been widely extracted for building heating purpose. In recent years, deep borehole heat exchanger (DBHE) heating system has gained more attention, especially in densely populated urban areas in Weihe Basin, northern China. The long-term performance and the economic feasibility are essential for the system application. In this work, the DBHE model implemented in OpenGeoSys software is verified against an analytical solution and a comprehensive economic analysis approach is further proposed. Then the short-term thermal performance tests are conducted to obtain the tentative heat extraction capacity for long-term simulation. The long-term simulations are further performed with the heat pump unit under the adjusted tentative heat extraction rate imposed on the DBHE. Finally, a comprehensive economic analysis is applied to the DBHE heating system over 15 heating seasons. Results show that the minimum coefficient of performance value of the heat pump is 4.74 over the operation of 15 heating seasons. With the increase of depth for the DBHE, the total electricity consumption of heat pumps and circulation pumps has a prominent promotion. With the comprehensive approach of economic analysis, the depth of 2,600 m has the lowest levelized cost of total heating amount, which is the best system design for the application in Weihe Basin. The present results are specific to the conditions in Weihe Basin, but the proposed economic analysis approach is generic.

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“…The long-lasting utilization of the thermal resource, as well as the huge amount of data (i.e., hydrogeological data, flow rates, information about the utilization of the thermal resource, and tourism data), represent a probable unique case study. A numerical study dedicated to the prediction of the long-term sustainability of geothermal heat extraction in a fault-control geological setting while integrating site-specific information and monitoring data is of great value to both academia and industry (Meng et al, 2019). Hence, a proper site-wise parameterized model for geothermal use on a neighborhood scale is of great importance for sustainability utilization.…”

Section: Introductionmentioning

confidence: 99%