A High Thermal Conductivity Cement for Geothermal Exploitation Application

Wang, Sheng; Jian, Liming; Shu, Zhihong; Chen, Shaohua; Chen, Liyi

doi:10.1007/s11053-020-09694-4

Cited by 23 publications

(5 citation statements)

References 19 publications

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“…Notably, the thermal conductivity of available cementitious materials does not exceed 3.85 Wm −1 K −1 52 . Therefore, the enhancement in thermal conductivity of geopolymer facilitates the transfer of temperature from the material interior to the exterior, making it more suitable for heating elements, the grout used in geothermal drilling and molten salt storage system 51–53 …”

Section: Resultsmentioning

confidence: 99%

“…52 Therefore, the enhancement in thermal conductivity of geopolymer facilitates the transfer of temperature from the material interior to the exterior, making it more suitable for heating elements, the grout used in geothermal drilling and molten salt storage system. [51][52][53] F I G U R E 1 0 SEM images of geopolymer: (A) GP-1; (B) GP-2; (C) GP-3; (D) GP-4.…”

Section: Thermal Conductivity Of Geopolymermentioning

confidence: 99%

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Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

Zhang,

Lin,

Chen

et al. 2024

Int J Applied Ceramic Tech

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This paper investigates the influence of carbon fiber and graphite on the cyclic electrothermal performance of geopolymers (inorganic polymers). It was observed that carbon fibers, graphite, and the carbon fiber/graphite composite could form a stable conductive network at low voltage (3 V). However, under high voltages (9 and 12 V), the current of the geopolymer exhibited a peak shape in the first cycle, with higher voltages resulting in larger peak values and decreased conductivity in subsequent cycles. While graphite improved electrical and thermal conductivity, it weakened the microstructure, leading to an increase in microcracks and voids, and a reduction in the strength of geopolymers. The cumulative energy during the electrothermal process was calculated. The failure mechanism of the conductive network in the geopolymer during cyclic electrical heating was explained, highlighting the disruptive effect of gel shrinkage due to water loss on conductive networks.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Conductivity Of Geopolymermentioning

confidence: 99%

Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

Zhang,

Lin,

Chen

et al. 2024

Int J Applied Ceramic Tech

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“…The thermal test has been carried a static fluid regime to determine the heat exchange occurring only through condu The test is divided into three steps: (1) heating phase to verify the response times thermal conductivities during the transmission of heat by conduction; (2) cooling to evaluate the thermal dispersion by conduction; and (3) heating/cooling phase in to determine the possible effect of thermal inertias. The study of an innovative heat exchange material has allowed to develop g change prototype systems useful to reproduce, at a small scale, the heat exchange t place between the elements of a geo-exchange system: subsoil-concrete/grout- [29,30]. Firstly, two cylindrical systems 1.05 m height were built and "U" type geoth probes have been embedded inside them.…”

Section: Methodsmentioning

confidence: 99%

“…Firstly, two cylindrical systems 1.05 m height were built and "U" type geoth probes have been embedded inside them. In particular, the first system has been a bled using a standard polyethylene probe cemented within a pre-mixed commercial (Figure 4a), while the second system has been built using a radial I50 probe fixed The study of an innovative heat exchange material has allowed to develop geoexchange prototype systems useful to reproduce, at a small scale, the heat exchange taking place between the elements of a geo-exchange system: subsoil-concrete/groutprobe [29,30]. Firstly, two cylindrical systems 1.05 m height were built and "U" type geothermal probes have been embedded inside them.…”

Section: Methodsmentioning

confidence: 99%

Innovative Solutions for Improving the Heat Exchange in Closed-Loop Shallow Geothermal Systems

et al. 2020

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Thermal conductivity, hydraulics properties and potential use in low-enthalpy geothermal applications of single and double U geothermal probes enhanced with carbon fibre are discussed in this work. Although the efficiency of a shallow geothermal installation is chiefly based on chemical and physical characteristics of rocks and hydrogeological aspects of the subsurface, the total heat extracted from the subsoil also depends on the intrinsic thermal characteristics of probes. New configurations and solutions aimed at enhancing the performance of components are therefore of considerable interest in this field of research. As a consequence of the economic and versatility advantages of the components, geothermal probes have been generally developed with materials like polyethylene, which presents, however, isolating behaviour that does not allow ideal heat exchange in ground source heat pump systems (GSHP). Innovative combinations of different materials are therefore necessary in order to improve thermal conductivity and to preserve the exceptional workability and commercial advantages of the finest elements available on the market. This work presents results coming from experimental tests involving standard polyethylene geothermal probes integrated with radial rings of polyacrylonitrile-based carbon fibre (PAN). Our evaluations are aimed at finding the best solutions for thermal exchange and adaptability with respect to traditional systems. Hydraulic and thermal performances and the response in a geo-exchange system have been verified. The new solutions appear to be highly suitable as geothermal exchangers in shallow geothermal systems and contribute to significantly reduce the total costs pertaining to the drilling operations.

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“…For example, the Beijing Xiaotangshan Hot Spring belongs to a basin-type geothermal system, which severely limits the geothermal water supply and drops the water level of the geothermal system at a rate of 2 m per year [13]. China has abundant geothermal resources that account for approximately 7.9% of the total world energy production, and the geothermal resource distribution has regional characteristics [14]. Southern Tibet, western Sichuan, and western Yunnan are the primary high-temperature geothermal resources, and the distribution of low-and medium-temperature geothermal resources is more widespread throughout China.…”

Section: Introductionmentioning

confidence: 99%

Geological and Geochemical Characteristics of the Geothermal Resources in Rucheng, China

Long¹,

Xie²,

Deng

et al. 2021

Lithosphere

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The development of geothermal energy promotes the changing of energy consumption structure in China. A series of experiments were performed to evaluate the geothermal resources of Rucheng County, which is the largest geothermal field in Central South China. The experiments include geothermal exploration, apparent resistivity, and determining the geochemical characteristics of the geothermal water. The experimental results show that the F3 fault zone and F1 hanging wall secondary fault are the main thermal control, heat conduction, water diversion, and thermal storage structures. The pH, EC, and Eh of the river water, shallow groundwater, and geothermal water exhibit seasonal changes. The pH and EC of the geothermal water are higher than those of the river water and shallow groundwater, while the Eh is lower. In addition, the corrosivity coefficient Kk and the Ryznar index are used to evaluate the corrosivity and calcium carbonate scaling of the geothermal water, and it is found that the geothermal water has no corrosiveness or calcium carbonate scaling, which indicates that the geothermal energy in Rucheng County has wide application prospects.

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A High Thermal Conductivity Cement for Geothermal Exploitation Application

Cited by 23 publications

References 19 publications

Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

Innovative Solutions for Improving the Heat Exchange in Closed-Loop Shallow Geothermal Systems

Geological and Geochemical Characteristics of the Geothermal Resources in Rucheng, China

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