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Evaluation of Ground Temperature Changes by the Operation of the Geothermal Heat Pump System and Climate Change in Korea

Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
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Water 2020, 12(10), 2931; https://doi.org/10.3390/w12102931
Received: 30 August 2020 / Revised: 15 October 2020 / Accepted: 16 October 2020 / Published: 20 October 2020
To evaluate long-term temperature changes caused by the operation of a geothermal heat pump (GHP) system, temperatures near borehole heat exchangers (BHEs) of the GHP system in Korea were measured. The temperature measurements showed increasing rates of 0.135 °C/year at a depth of 10 m and 0.118 °C/year at a depth of 50 m for approximately 10 years. Simulations for the analysis of climate change effects on measured temperature fluctuations showed that a rate of temperature increase was 0.010 °C/year at a depth of 50 m owing to changes in surface air temperatures (SATs). From two-dimensional heat transfer simulations, the discharged heat measuring 16.7 W/m in the cooling season and extracted heat measuring 12.4 W/m in the heating season could cause an annual mean temperature increase of 0.109 °C over approximately 10 years. Additionally, results of simulations for future prediction of ground temperatures assuming that the GHP system retains its level of operation showed that in 2050, temperature at a depth of 50 m will increase by approximately 3.00 °C from that in 2005. Thus, balancing the heat discharged into and extracted from the ground by considering climate change to minimize long-term changes in the ground temperature is necessary. View Full-Text
Keywords: geothermal heat pump; ground temperature increase; climate change; TOUGH3 geothermal heat pump; ground temperature increase; climate change; TOUGH3
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Kim, S.-K.; Lee, Y. Evaluation of Ground Temperature Changes by the Operation of the Geothermal Heat Pump System and Climate Change in Korea. Water 2020, 12, 2931.

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