Numerical simulation of a Deep Borehole Heat Exchanger in the Krafla geothermal system

Renaud, Théo; Verdin, Patrick G.; Falcone, Gioia

doi:10.1016/j.ijheatmasstransfer.2019.118496

Cited by 80 publications

(35 citation statements)

References 37 publications

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“…In addition, this CFD simulation identified the flow patterns in the wellbore. In the Krafla geothermal field in Iceland, this technology was combined with the organic Rankine cycle to convert thermal energy into electricity (Renaud et al, 2019b). Other applications of CFD models for real cases can also be found in Ez Abadi et al 2020, Ramezanizadeh et al (2019), Akbarian et al (2018).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the effects of CO₂ gas in geothermal water on the fluid-flow characteristics in production wells

Khasani

Deendarlianto

Itoi

2021

Engineering Applications of Computational Fluid Mechanics

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Section: Introductionmentioning

confidence: 99%

Numerical study of the effects of CO₂ gas in geothermal water on the fluid-flow characteristics in production wells

Khasani

Deendarlianto

Itoi

2021

Engineering Applications of Computational Fluid Mechanics

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“…The main obstacles to the growth of the geothermal sector are the costs and risk related to exploration and drilling phases, and the absence of social consensus among the population. An interesting solution proposed by several authors since 2000, i.e., [2][3][4][5][6][7], is the use of a zero-mass extraction device. The plant is a coaxial heat exchanger made of steel (Figure 1), which avoids all the risks (corrosion, scaling, subsidence, vapour emissions, micro-seismicity) and the costs related to the extraction and reinjection of brine.…”

Section: Introductionmentioning

confidence: 99%

Selecting the Optimal Use of the Geothermal Energy Produced with a Deep Borehole Heat Exchanger: Exergy Performance

Alimonti

Conti

Soldo

2020

The First World Energies Forum—Current and Future Energy Issues

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The geothermal sector has a strength point with respect to other renewable energy sources: the availability of a wide range of both thermal and power applications depending on the source temperature. Several researches have been focused on the possibility to produce geothermal energy without brine extraction, by means of a deep borehole heat exchanger. This solution may be the key to increase the social acceptance, to reduce the environmental impact of geothermal projects, and to exploit unconventional geothermal systems, where the extraction of brine is technically complex. In this work, exergy efficiency has been used to investigate the best utilization strategy downstream of the deep borehole heat exchanger. Five configurations have been analyzed: a district heating plant, an absorption cooling plant, an organic Rankine cycle, a cascade system composed of district heat and absorption chiller, and a cascade system composed of the organic Rankine plant. District heating results in a promising and robust solution: it ensures high energy capacities per well depth and high exergy efficiency. Power production shows performances in line with typical geothermal binary plants, but the system capacity per well depth is low and the complexity increases both irreversibilities and sensibility to operative and source conditions.

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“…The modelled DBHE involves pumping cold fluid down the outer annulus, such that hot fluid rises to surface up the inner tubing via a thermosiphon effect (natural convection) or through the use of pumps (Tang et al, 2019). The DBHE design was previously modelled in the Villafortuna abandoned oil well in Italy , the KTB deep borehole project setting in Germany (Falcone et al, 2018) and the IDDP-1 well in Iceland (Renaud et al, 2019). Replacing the current NWG 55-29 well with a DBHE would not only mitigate the risks of induced seismicity, but also prevent fluid losses and contamination to the surrounding environment, as the working fluid is not in direct contact with the surrounding rock (Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Modelling an unconventional closed-loop deep borehole heat exchanger (DBHE): Sensitivity Analysis on the Newberry Volcanic Setting

Doran

Renaud

Falcone

et al. 2020

Preprint

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Geothermal energy is a baseload resource that has the potential to contribute significantly to the transition to a low-carbon future. Alternative (unconventional) deep geothermal designs are thus needed to provide a secure and efficient energy supply. Current Enhanced Geothermal Systems (EGS) are under technical review as a result of the associated low recovery factors and risk of induced seismicity in connection with reservoir stimulation operations, and Supercritical EGS (SEGS) concepts are still under early research and development. The Newberry and Icelandic Deep Drilling Projects (NDDP and IDDP) aid these developments to drill deeper into very hot temperature zones. An in-depth sensitivity analysis was investigated considering a deep borehole closed-loop heat exchanger (DBHE) to overcome the current limitations of deep EGS. Using the DBHE, cold working fluid is pumped down in the outer annulus and rises to the surface via natural convection or is pumped up via an inner tubing. A T2Well/EOS1 model previously calibrated on an experimental DBHE in Hawaii was adapted to the current NWG 55-29 well at the Newberry volcano site in Central Oregon. A sensitivity analysis was carried out, including parameters such as: the working fluid mass flow rate, the casing and cement thermal properties and the wellbore radii dimensions. The results allow an assessment of key thermodynamics within the wellbore and provide an insight into how heat is lost/gained throughout the system. This analysis was performed under the assumption of sub-critical conditions. Requirements for further software development are briefly discussed, which would facilitate the modelling of unconventional geothermal wells in supercritical systems.

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Numerical simulation of a Deep Borehole Heat Exchanger in the Krafla geothermal system

Cited by 80 publications

References 37 publications

Numerical study of the effects of CO₂ gas in geothermal water on the fluid-flow characteristics in production wells

Numerical study of the effects of CO₂ gas in geothermal water on the fluid-flow characteristics in production wells

Selecting the Optimal Use of the Geothermal Energy Produced with a Deep Borehole Heat Exchanger: Exergy Performance

Modelling an unconventional closed-loop deep borehole heat exchanger (DBHE): Sensitivity Analysis on the Newberry Volcanic Setting

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Numerical simulation of a Deep Borehole Heat Exchanger in the Krafla geothermal system

Cited by 80 publications

References 37 publications

Numerical study of the effects of CO2 gas in geothermal water on the fluid-flow characteristics in production wells

Numerical study of the effects of CO2 gas in geothermal water on the fluid-flow characteristics in production wells

Selecting the Optimal Use of the Geothermal Energy Produced with a Deep Borehole Heat Exchanger: Exergy Performance

Modelling an unconventional closed-loop deep borehole heat exchanger (DBHE): Sensitivity Analysis on the Newberry Volcanic Setting

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Numerical study of the effects of CO₂ gas in geothermal water on the fluid-flow characteristics in production wells

Numerical study of the effects of CO₂ gas in geothermal water on the fluid-flow characteristics in production wells