Ground heat exchanger thermal imbalance prevention using dynamic long-term ground temperature predictions

Dacquay, Connor; Lohrenz, Ed; Fujii, Hikari

doi:10.1080/15435075.2021.1977651

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…The ground-source heat pump system is currently the most important development and utilization method of shallow geothermal resources, providing heating, cooling, and hot water supply for buildings. [3][4][5][6] In the ground-source heat pump system, the equipment for heat exchange with underground soil is the ground heat exchanger. The working effect of ground-source heat pump system depends largely on the performance of backfill materials around the ground heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigations on the Heat Transfer Performance of a New Type of Energy Pile

Rong,

Zhou,

Wang

et al. 2023

Energy Tech

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The ground‐source heat pump heating and cooling system is currently the most important development and utilization method of shallow geothermal resources, but its key component is the ground heat exchanger system. Herein, a new type of ground heat exchanger, the soil‐cement energy pile, is proposed. The similarity model comparison experiments of the soil‐cement energy piles and the soil energy pile in summer and winter were conducted respectively, and the 3D numerical models of heat transfer of the two kinds of energy piles are established, their related thermal properties are verified. Then the heat transfer calculation methods of the soil‐cement energy pile are presented and validated. The research has shown that the soil‐cement energy pile has good thermodynamic performance, which effectively reduces the largest thermal resistance in the heat transfer system of the energy pile, the thermal resistance of pile body material, and the heat transfer per linear meter of the soil‐cement energy pile is 21.20%–55.60% higher than that of the soil energy pile. The soil‐cement energy pile is of great significance to improve the thermal efficiency of the ground‐source heat pump system and can reduces the overall project cost.

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Section: Introductionmentioning

confidence: 99%

“…The ground‐source heat pump system is currently the most important development and utilization method of shallow geothermal resources, providing heating, cooling, and hot water supply for buildings. [ 3–6 ]…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Heat Transfer Performance of a New Type of Energy Pile

Rong,

Zhou,

Wang

et al. 2023

Energy Tech

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Quantifying vertical borehole heat exchanger sustainability from a geothermal resource perspective in the UK

Receveur,

McDermott,

Fraser-Harris

et al. 2024

Geoenergy

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Low-temperature geothermal energy is viewed as a renewable resource that could contribute to the decarbonisation of residential heating in the UK. Here we constrain the geothermal potential of the shallow subsurface to provide the heating requirements of a typical single-family house via a vertical Borehole Heat Exchanger (BHE), to provide a preliminary framework for the heat resource licensing of such systems. Through analytical and numerical models, we calculate the heat balance for a typical house with a garden located in Carboniferous sedimentary basins, which represent a large proportion of the UK land mass and the regions where energy poverty is more common. Neglecting the heat recharge via groundwater flow, our results indicate that geothermal, solar heat flux and radiogenic heat production can only replenish up to 5% of the heat extracted annually by a 100 m BHE in heat extraction mode only. The lack of natural recharge causes the continuous expansion of the thermal footprint at an average rate of 18 m² yr -1 over 30 years, considering a ground thermal conductivity of 2.2 W (m°C) -1 , with the area cooled by 1°C extending beyond the current minimum BHE spacing guidelines of 6 m. In Scotland, reinjecting c. 35% of the yearly heat requirements, which could be accomplished through borehole thermal energy storage, is shown to safeguard against resource over-exploitation and interference risks between neighbouring users in the majority of the high-demand areas. In view of a large deployment of BHEs, it is crucial to incorporate such reinjection strategies into a regulatory framework to ensure a resilient and sustainable utilisation of shallow geothermal resources.

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Ground heat exchanger thermal imbalance prevention using dynamic long-term ground temperature predictions

Cited by 2 publications

References 19 publications

Experimental and Numerical Investigations on the Heat Transfer Performance of a New Type of Energy Pile

Experimental and Numerical Investigations on the Heat Transfer Performance of a New Type of Energy Pile

Quantifying vertical borehole heat exchanger sustainability from a geothermal resource perspective in the UK

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