Numerical modelling of deep coaxial borehole heat exchangers in the Cheshire Basin, UK

Brown, Christopher S.; Cassidy, Nigel J.; Egan, Stuart; Griffiths, Dan

doi:10.1016/j.cageo.2021.104752

Cited by 54 publications

(30 citation statements)

References 38 publications

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“…In comparison with other two-dimensional DBHE models (Nian et al, 2019;Brown et al, 2021), the 3D DBHE model presented in this work is also well applicable in modeling the heat extraction performance of the DBHE (Kong et al, 2017), especially for the flexible boundary conditions and segmented soil properties. Furthermore, the proposed model has been validated by several experimental data, including northwestern and northeastern China (Huang et al, 2020;Cai et al, 2021), and other regions (Chen et al, 2020a).…”

Section: Comparison With Other Published Dbhe Modelsmentioning

confidence: 95%

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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Section: Comparison With Other Published Dbhe Modelsmentioning

confidence: 95%

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

et al. 2022

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“…The equation gives the well cost in millions of dollars which is converted to pounds using a factor of 0.77. The cost of drilling a single well in the Cheshire Basin would be in the region of £5.7 million, assuming the reservoir is located at a depth of 2800 m [12,19,20,25] For the worst-case scenario (67 • C input temperature of the geothermal fluid and high heat exchanger cost of £400 m 2 ), the savings of switching to a geothermal run district heat network would be £2.1784 million per year. The payback time for a doublet (two-well) scheme would, therefore, be ~5.2 years.…”

Section: Considering the Cost To Drill A Geothermal Doubletmentioning

confidence: 99%

“…Further studies on heat exchangers in geothermal systems have investigated direct heat exchange in a downhole heat exchanger geothermal system [11]. This is similar to the use of borehole heat exchangers, where fluid is not extracted from a geothermal reservoir and heat transfer occurs directly at depth via conduction through the pipe and grout (e.g., [12,13]). Earth-to-air heat exchangers have also been used in ventilation systems in temperate climate locations, highlighting that the geometry of such systems is important (e.g., [14]).…”

Section: Introductionmentioning

confidence: 99%

“…At present, financial and geological risk remains high within the Cheshire Basin and much of the UK. Although some attempts were made to reduce the geological risk, through the complex modelling of new extraction techniques such as deep borehole heat exchangers ( [12,19,20]), minimal studies have observed the financial connotations. Those which have, focus on single well systems, suggesting that any profit is minimal ( [21]).…”

Section: Introductionmentioning

confidence: 99%

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Thermal and Economic Analysis of Heat Exchangers as Part of a Geothermal District Heating Scheme in the Cheshire Basin, UK

et al. 2022

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Heat exchangers are vital to any geothermal system looking to use direct heat supplied via a district heat network. Attention on geothermal schemes in the UK has been growing, with minimal attention on the performance of heat exchangers. In this study, different types of heat exchangers are analysed for the Cheshire Basin as a case study, specifically the Crewe area, to establish their effectiveness and optimal heat transfer area. The results indicate that counter-current flow heat exchangers have a higher effectiveness than co-current heat exchangers. Optimisation of the heat exchange area can produce total savings of £43.06 million and £71.5 million, over a 25-year lifetime, in comparison with a fossil-fuelled district heat network using geothermal fluid input temperatures of 67 °C and 86 °C, respectively.

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“…Extraction studies have shown that increasing the borehole depth disproportionately increases the achievable heat load due to the interplay of two factors: (i) increasing temperature due to the geothermal gradient, and (ii) a greater borehole length (and surface area) for heat exchange [15,61]. Therefore, the greater overall surface areas of deeper boreholes could also increase performance during energy storage.…”

Section: Introductionmentioning

confidence: 99%

Repurposing a deep geothermal exploration well for borehole thermal energy storage: Implications from statistical modelling and sensitivity analysis

Brown

Kolo

Falcone

et al. 2023

Applied Thermal Engineering

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Numerical modelling of deep coaxial borehole heat exchangers in the Cheshire Basin, UK

Cited by 54 publications

References 38 publications

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

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

Thermal and Economic Analysis of Heat Exchangers as Part of a Geothermal District Heating Scheme in the Cheshire Basin, UK

Repurposing a deep geothermal exploration well for borehole thermal energy storage: Implications from statistical modelling and sensitivity analysis

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