Evaluation of utilizing horizontal directional drilling technology for ground source heat pumps

Bina, Saeid Mohammadzadeh; Fujii, Hikari; Tsuya, Shunsuke; Kosukegawa, Hiroyuki; Naganawa, Shigemi; Harada, Retsu

doi:10.1016/j.geothermics.2019.101769

Cited by 20 publications

(6 citation statements)

References 14 publications

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“…Given such a limitation, researchers often tend to consider completely different alternatives to the conventional vertical U-tube design. Such alternatives include relatively standard horizontal or slinky systems [33], as well as more novel and advanced proposals, including underground thermal batteries making use of phase change materials [34]. Notwithstanding this, interest in the vertical U-tube design is still high; fairly recently, a number of studies have been published focusing specifically on shallow vertical ground heat exchangers.…”

Section: Effect Of Shank-space On System Performancementioning

confidence: 99%

The Effect of Shank-Space on the Thermal Performance of Shallow Vertical U-Tube Ground Heat Exchangers

Vella¹,

Borg²,

Micallef³

2020

Energies

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One parameter that may affect the performance of a ground source heat pump is the shank-space, the center-to-center distance between the two branches of a vertical U-tube used in a ground heat exchanger. A 3D steady-state computational fluid dynamics (CFD) model of a U-tube ground heat exchanger was used to investigate the influence of varying shank-space on the thermal performance of two isolated vertical shallow U-tubes, one 20 m deep and the other 40 m deep, given that most existing research focuses on systems making use of deeper boreholes. The models adopt an innovative approach, whereby the U-junction at the bottom of the U-tube is eliminated, thus facilitating the computational process. The results obtained show that, although the temperature drop across the U-tube varies for different shank-spaces and is lowest and highest for the closest and the widest shank-spaces, respectively, this temperature drop is not linear with increases in shank-space, and the thermal performance improvement drastically diminishes with increasing shank-space. This indicates that, for shallow U-tubes, the temperature drop is more dependent on the length of the pipework.

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Section: Effect Of Shank-space On System Performancementioning

confidence: 99%

The Effect of Shank-Space on the Thermal Performance of Shallow Vertical U-Tube Ground Heat Exchangers

Vella¹,

Borg²,

Micallef³

2020

Energies

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“…A slewing device is the core part of a drilling rig, which drives the drilling tool to turn and provides torque. It is primarily used to clamp the drill pipe, convert the speed and torque output from the hydraulic motor into those compatible with the drilling process requirements, transfer them to the the drill pipe to drive the slewing, and realize the omni-directional operation of the roadway [2][3][4]. In the process of drilling, the drill bit will produce a resistance moment when breaking rock, and the disturbance of the drill pipe and hole wall will also produce a resistance moment.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Static Multiobjective Topology Optimization for Gears of Directional Drill Transmission System

Xiao-hong

Yan

Chen

et al. 2023

Advances in Civil Engineering

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Aiming at the multiobjective topology optimization design of the structure, this paper proposes a method to establish the comprehensive objective function based on the normalized subobjective of the compromise programming method and to determine the weight coefficient of the subobjective of the comprehensive objective function by the analytic hierarchy process (AHP). By using statistical analysis and modal analysis, the static and dynamic characteristics of the gear can be obtained. The single objective topology optimization is used to reduce the compliance of the gear and elevate the low-order natural frequency, and the frequency weighting method is used to suppress the oscillation phenomenon in the frequency-single-objective optimization. AHP was used to determine the weight coefficient of each subtarget. The compromise programming method is used for multiobjective topology optimization, and the gear design is improved according to the optimization results. By analyzing the improved gear structure, the weight of the optimized gear is reduced by 25.3%. The overall stiffness performance and strength performance are enhanced, and the natural frequencies of each order are improved to different degrees.

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“…After that, the Drilling Technology Research Institute of Shengli Oilfield successfully developed MWD and gamma meter while drilling [10]. Through the continuous efforts of domestic scientific researchers, "GCD-D" has also been widely used in coal mine water control, gas drainage, geothermal wells, and others [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Study on Prevention and Control of Confined Water Hazard in Deep Resource Exploitation: Scientific Basis of “GCD-D” Design

Wang

et al. 2023

Geofluids

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Deep mining of resources has destroyed the stress balance of original rock, formed water gushing channel, and caused the outburst of confined water, thus causing disaster. At present, “Ground Controlled Directional Bedding Branch Drilling (GCD-D)” grouting has achieved remarkable results in controlling water disasters. However, “what is the scientific design principle of GCD-D?” This key scientific question has not yet been answered by systematic science. According to the regional engineering geology and hydrogeological conditions of North China-type coalfields, this study uses the methods of analogy, theoretical analysis, and model analysis to demonstrate and analyze and obtains six basic principles for the selection of the target layer for the layout of “GCD-D.” The design principle of “GCD-D” was put forward for the first time. The results can provide a scientific theoretical basis for the control of confined water disaster in deep mining of North China coalfields.

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Evaluation of utilizing horizontal directional drilling technology for ground source heat pumps

Cited by 20 publications

References 14 publications

The Effect of Shank-Space on the Thermal Performance of Shallow Vertical U-Tube Ground Heat Exchangers

The Effect of Shank-Space on the Thermal Performance of Shallow Vertical U-Tube Ground Heat Exchangers

Dynamic and Static Multiobjective Topology Optimization for Gears of Directional Drill Transmission System

Study on Prevention and Control of Confined Water Hazard in Deep Resource Exploitation: Scientific Basis of “GCD-D” Design

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