The thermal conductivity decomposition of calcite calculated by molecular dynamics simulation

Momenzadeh, Leila; Moghtaderi, Behdad; Buzzi, Olivier; Liu, Xianfeng; Sloan, Scott W.; Murch, Graeme E.

doi:10.1016/j.commatsci.2017.09.033

Cited by 22 publications

(15 citation statements)

References 30 publications

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“…Unlike rock (and especially rock mass) thermal conductivities, those of pure minerals have been precisely determined. At standard temperature, thermal conductivity of calcite is in the range of 3.3-3.6 Wm −1 K −1 (Robertson 1988) or 3.3-3.8 Wm −1 K −1 (Momenzadeh et al 2018) depending on the orientation of crystals in relation to heat flow.…”

Section: Resultsmentioning

confidence: 99%

Conditions for shallow geothermal energy utilization in Dinaric karst terrains in Croatia

2019

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Hydrogeological and thermogeological properties of the shallow subsurface in the Dinaric karst area of Croatia were investigated in the context of its utilization for ground-and water-source heat pumps (GSHPs and WSHPs). The research encompassed four 100 m deep boreholes with GSHP installations in both coastal and inland Dinaric karst (different limestones and evaporitic rocks at one location), and a set of six exploratory boreholes, abstraction and reinjection wells for WSHP heating and cooling using seawater on the coast (fractured and karstified limestones). It was determined that rock thermal conductivities are favourable for GSHP utilization, but dependent on the wider rock mass characteristics which are hard to predict (size of karst voids and their saturation status). In addition, wells with high enough yield and stabile seawater or groundwater temperatures for WSHP utilization can be designed in appropriate structural settings (tensional fractures and fracture set intersections). Advantages and disadvantages of the utilized methodology have been pointed out, as well as methods which should prove useful in the future, especially if larger systems are planned. Hydrogeological, geotechnical, and thermal risks expected during the drilling, installation, and operational phases have also been identified. Presented case studies have given the insight into heat pump installation options and conditions in Croatian part of the Dinarides, but can be useful to other researchers and engineers both in the Dinarides and in similar karst regions. Keywords Dinaric karst • Rock thermal properties • Hydrogeological properties • Heat pumps • Croatia This article is a part of a Topical Collection in Environmental Earth Sciences on Sustainable Management of Karst Natural Resources, guest edited by Drs. Sasa Malinovic and Zoran Stevanovic.

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Section: Resultsmentioning

confidence: 99%

Conditions for shallow geothermal energy utilization in Dinaric karst terrains in Croatia

2019

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“…Moreover, the content of calcite (70 wt %) was much higher than other minerals. The calcite, with the main component as carbonate mineral (CaCO 3 ), can be decomposed at high temperature and release carbon dioxide gas. , …”

Section: Resultsmentioning

confidence: 99%

Combustion Characteristics of Tight Sandstone

2018

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As a promising unconventional energy source, tight sandstone gas has attracted increasing attention. Because of the extremely low porosity/permeability of tight sandstone, large scale exploration and development are still challenging. Recently, high-temperature combustion or pyrolysis has been employed to increase sandstone porosity/permeability. In this study, the sandstone samples obtained from Xinjiang Province in China were heated for 30 min in air atmosphere at temperatures of 350, 500, 700, 800, and 900 °C respectively. The combustion characteristics and property changes of sandstone were investigated. In the beginning, thermal decomposition process of sandstone and gas emission were tested using thermogravimetry combined with Fourier transform infrared spectroscopy. Then, the mineral composition and pore structure of different combusted sandstones were tested and analyzed. Moreover, the effects of combustion temperature on particle size of sandstone were also investigated. Finally, scanning electron microscopy (SEM) technology was performed to study the surface appearance change of sandstone. According to the experiment results, organic matters started releasing at 350−500 °C, and most of the minerals such as carbonate decomposed at 600−870 °C. During the combustion process, carbon dioxide and water vapor were the main product gases. With the increase of combustion temperature, the mean pore diameter increased from 8.0 to 22.6 nm, while the particles size remained almost constant. In addition to the increase of pore size, it can be found from SEM photos that the compact surface of sandstone became smooth and some new pores and small cracks appeared on the surface of sandstone after high-temperature combustion, especially at 900 °C. As a result, high-temperature combustion is one of the feasible methods to improve the porosity/permeability of sandstone.

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“…To study thermal damage characteristics and decomposition of carbonate minerals, several techniques have been utilized, such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), differential thermal analysis (DTA), thermo-balance, scanning electron microscopy, optical microscopy, X-ray diffraction, high-temperature X-ray diffraction, etc. [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. A summary of major developments and employed quantitative methods regarding the decomposition of carbonate minerals is provided in Table 1.…”

Section: Thermal Decomposition Of Calcite and Dolomitementioning

confidence: 99%

“…[46] Calcite Thermo-physical decomposition was studied under equilibrium dynamic simulation. [47] Calcite Parameters including unit cell volume alteration, thermal expansion, variations along lattice axis, and thermal strains were studied using high-temperature X-ray powder diffraction. [26] Calcite Thermal decomposition analysis was performed to validate improved reaction kinetic equation based on the pore structure model.…”

Section: Dolomitementioning

confidence: 99%

Damage Characteristics of Thermally Deteriorated Carbonate Rocks: A Review

et al. 2022

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This review paper summarizes the recent and past experimental findings to evaluate the damage characteristics of carbonate rocks subjected to thermal treatment (20–1500 °C). The outcomes of published studies show that the degree of thermal damage in the post-heated carbonate rocks is attributed to their rock fabric, microstructural patterns, mineral composition, texture, grain cementations, particle orientations, and grain contact surface area. The expressive variations in the engineering properties of these rocks subjected to the temperature (>500 °C) are the results of chemical processes (hydration, dehydration, deionization, melting, mineral phase transformation, etc.), intercrystalline and intergranular thermal cracking, the separation between cemented particles, removal of bonding agents, and internal defects. Thermally deteriorated carbonate rocks experience a significant reduction in their fracture toughness, static–dynamic strength, static–dynamic elastic moduli, wave velocities, and thermal transport properties, whereas their porous network properties appreciate with the temperature. The stress–strain curves illustrate that post-heated carbonate rocks show brittleness below a temperature of 400 °C, brittle–ductile transformation at a temperature range of 400 to 500 °C, and ductile behavior beyond this critical temperature. The aspects discussed in this review comprehensively describe the damage mechanism of thermally exploited carbonate rocks that can be used as a reference in rock mass classification, sub-surface investigation, and geotechnical site characterization.

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The thermal conductivity decomposition of calcite calculated by molecular dynamics simulation

Cited by 22 publications

References 30 publications

Conditions for shallow geothermal energy utilization in Dinaric karst terrains in Croatia

Conditions for shallow geothermal energy utilization in Dinaric karst terrains in Croatia

Combustion Characteristics of Tight Sandstone

Damage Characteristics of Thermally Deteriorated Carbonate Rocks: A Review

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