Medium Rock-Soil Temperature Distribution Characteristics at Different Time Scales and New Layout Forms in the Application of Medium-Deep Borehole Heat Exchangers

Energies, Journal Year: 2023, Volume and Issue: 16(19), P. 6970 - 6970

Published: Oct. 6, 2023

Medium-deep borehole heat exchangers (MBHEs) have received increasing attention with respect to building heating. To avoid the thermal interference of adjacent MBHEs, temperature distribution characteristics medium-deep rock soil were investigated in this work. The evolution maximum rock-soil affected radius (MTAR) over a full lifecycle was analyzed. results showed that area (RTAA) continuously expanded both radial and vertical directions when MBHE extracted geothermal energy during heating season. factors extraction load, fluid velocity, gradient, pipe length, impacted RTAA direction, while conductivity directions. Furthermore, (TAR) deeper formations larger, reaching even 96 m, such between MBHEs more likely occur. MTAR shallow limited 20 m. Consequently, new layout form, achieved by inclining borehole, proposed increase distance deep formations. recommended incline angle equal or larger than four times TAR angle. This work provides scientific reference for promoting application multiple arrays.

Language: Английский

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Probabilistic assessment of deep geothermal resources in the Cornubian Batholith and their development in Cornwall and Devon, United Kingdom

Geothermics, Journal Year: 2024, Volume and Issue: 122, P. 103081 - 103081

Published: June 27, 2024

Geothermal energy could play a pivotal role in decarbonisation as it can provide clean, constant base-load which is weather independent. With growing demand for clean and improved security, geothermal resources must be quantified to reduce exploration risk. This study aims quantify the untapped resource-potential of Cornubian Batholith resource power generation direct heat use. Recent field work, laboratory measurements petrophysical characterization provides newly compiled dataset inclusive subsurface samples taken from production well United Downs Deep Power Project. Deterministic probabilistic calculations are undertaken evaluate the: total place, recoverable resource, technical potential carbon savings. The considered petrothermal system may require stimulation an enhanced system. shows batholith has significant stored 8988 EJ (P50), corresponding 366 556 GWth. When evaluating (i.e., electricity) P50 31 GWe. savings when generating electricity (P50) equates 106 Mt.

Language: Английский

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Feasibility of Coaxial Deep Borehole Heat Exchangers in Southern California

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: July 19, 2024

This paper investigates the feasibility of Coaxial Deep Borehole Heat Exchanger (CDBHE) applications to campus at University California San Diego (UCSD). By collecting different geophysical source data for various formations and well logs around UCSD campus, a multilayered thermophysical model ground on site is established. Circulation water within closed coaxial loop system considers geothermal energy extraction under uncertainity consideration unknown deeper layers heat flow gradient as coupled with variation pipe insulation properties, rates, outer diameter, grout depths between 1 km 4 km. A finite-element framework constituted Navier-Stokes fluid transfer in CDBHE system, validated field test from literature. It was found that could produce thermal power 600 kW optimum geological conditions site. Thermal shares indicate formation contribute more than shallower layers. An inner an insulated depth 2 produces only 1–6% less fully CDBHE, thus partially VIT-plastic suggested. Furthermore, increases by 5% when conductivity 3.65 W/(K∙m), close conductivity, then maintains almost same, rates 2.78–6.94 L/s can directly supply low-temperature heating radiator room heating. The effects investigated factors provide guidelines future resource exploitation southern California.

Language: Английский

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Explaining the emergence and absence of Seasonal Thermal Energy Storage in the UK: Evidence from local case studies

Applied Energy, Journal Year: 2024, Volume and Issue: 377, P. 124322 - 124322

Published: Sept. 26, 2024

Language: Английский

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Short-cycle borehole thermal energy storage: Impact of thermal cycle duration on overall performance

Applied Thermal Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 124610 - 124610

Published: Oct. 1, 2024

Language: Английский

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