Article
Green & Sustainable Science & Technology
Chenchen Feng, Huaijiu Wang, Zefeng Jing
Summary: A physical model of thermal storage using CO2 as working medium is built based on geological conditions in China, studying the effects of injection parameters, thermal storage properties, and perforation position on seepage and heat characteristics. Quantitative results show that factors like injection pressure and flow rate influence heat extraction, with permeability distribution and perforation position affecting thermal storage life. Consistent permeability variation along depth is beneficial for HDR development, providing insights for future geothermal system construction.
Article
Engineering, Geological
Yuedu Chen, Zhihong Zhao, Huan Peng
Summary: This study investigates the impact of intersected fractures on heat transfer in geothermal systems, finding that rough dead-end fractures enhance heat transfer and increasing the intersected angle is beneficial for heat production, while enlarging the aperture has little effect.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Thermodynamics
Juanwen Chen, Wenbo Huang, Jiwen Cen, Wenjiong Cao, Zhibin Li, Feng Li, Fangming Jiang
Summary: A novel technical scheme for extracting deep-earth hot dry rock heat using a super-long gravity heat pipe (SLGHP) system in a single-well has attracted attention in the geothermal energy community. This study proposes a selection criterion to guide the fast screening of potential working fluids for SLGHP. The criterion evaluates the effect of working fluid on SLGHP thermal performance based on the temperature gradient along the SLGHP. Numerical simulations and fast-screening evaluations demonstrate good consistency, indicating the validity of the proposed criterion. The study suggests that ammonia is preferable for low temperature and small diameter heat pipes, while water is the best choice for high temperature and large diameter heat pipes. The selection criterion provides a convenient and reliable tool for choosing the most suitable working fluid for geothermal energy exploitation.
Article
Geosciences, Multidisciplinary
Feng Xiong, Chun Zhu, Gan Feng, Jun Zheng, Hao Sun
Summary: Three-dimensional fluid flow and thermal transport modeling in discrete fracture networks (DFNs) is crucial for enhanced geothermal systems (EGSs). A coupled thermo-hydro (T-H) model based on the Galerkin finite element method was developed, considering nonlinear fluid flow models and a simplified thermal transport model. The proposed method was validated using experimental, analytical, and numerical solutions, and applied to simulate heat extraction in a Habanero EGS reservoir. The results showed that injection pressure and temperature had different effects on power generation and reservoir lifespan.
Article
Thermodynamics
Wenbo Huang, Jiwen Cen, Juanwen Chen, Wenjiong Cao, Zhibin Li, Feng Li, Fangming Jiang
Summary: Recent theoretical studies have shown that a novel scheme for earth-deep hot dry rock geothermal energy extraction using a super-long heat pipe is highly feasible. A field test using a 3000-m heat pipe was conducted to demonstrate its practical feasibility, and the results showed successful heat extraction with an average rate of 190 kW over a 30-day period without significant decline.
Article
Thermodynamics
Wenbo Huang, Juanwen Chen, Jiwen Cen, Wenjiong Cao, Zhibin Li, Feng Li, Fangming Jiang
Summary: The study investigates the performance of a novel technical scheme for extracting hot dry rock energy using a super-long gravity heat pipe in a single-well. Through a sensitivity analysis, it is found that increasing the heat pipe diameter and lowering the condensation temperature significantly enhance the thermal performance, while thermal insulation and the low thermal conductivity of hot dry rock act as key bottlenecks in the system's performance.
Article
Green & Sustainable Science & Technology
Musa D. Aliyu, Rosalind A. Archer
Summary: This paper presents a new three-dimensional numerical model of a hot dry rock geothermal reservoir and analyzes two case studies to determine the impact of different factors on reservoir performance, showing that wellbore placement significantly affects reservoir performance.
Article
Engineering, Mechanical
Victor Roda-Casanova, Francisco Sanchez-Marin, Raul Martinez-Cuenca
Summary: Heat convection is a significant factor in the cooling process of polymer spur gears running in dry conditions, affecting the gear strength. A numerical heat convection model is proposed in this study, based on a detailed CFD simulation, to investigate heat convection on the external surfaces of the gears. Parametric studies reveal that the relative differences between the results obtained from this model and a representative classical heat convection model can reach up to 125% in terms of heat transfer coefficients. An optimized heat convection model, using empirical equations derived from Newton's law of cooling, is proposed to improve the accuracy of the classical models while reducing the maximum relative differences to 10%.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Geochemistry & Geophysics
Yang Yang, Fangbo Chen, Siliu Yu, Yubin Zheng, Sujie He, Yan Zeng, Xiaoli Xie, Jie Zhu, Nan Luo
Summary: This study explores the deep geoelectrical structural background and thermal source mechanisms of the Gonghe Basin, Qinghai Province, China, through a magnetotelluric survey line combined with regional geology data. The results reveal the existence of a deep structure with high conductivity, comparable to the structure in the eastern part of the Qinghai-Tibet Plateau. The rushing reverse fault plays a crucial role in heat control and conduction, and high-temperature heat storage is found in four layers of geothermal resources. The proposed triple-polymorphism model of hot-dry rock provides critical insights into geothermal causes, resource prediction, and planning in the Qinghai-Tibet Plateau.
Article
Thermodynamics
Leyre Catalan, Patricia Alegria, Miguel Araiz, David Astrain
Summary: This paper presents an experiment conducted in Timanfaya National Park to test the feasibility of a geothermal thermoelectric generator (GTEG) with passive phase change heat exchangers. The results showed that the device, which has been operating without maintenance for 2 years, produced more than 520 kWh of energy. It was also found that installing more thermoelectric modules can increase the total power generation, but at the expense of lower generation per module.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xueling Liu, Jintao Niu, Jiansheng Wang, Huipeng Zhang, Liwei Dong
Summary: This study investigated the coupling mechanism of a double-stage Organic Rankine Cycle (ORC) power generation system, finding that the double-stage ORC system can increase net output power while decreasing thermal efficiency, showing promising results for utilizing dry hot rock resources.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Renhui He, Guan Rong, Jie Tan, Kok-Kwang Phoon, Junsong Quan
Summary: The roughness of fractured surfaces significantly affects fluid flow and heat transfer in fractured rocks. This study compares the role of rough-walled fractures with parallel plates in modeling Enhanced Geothermal Systems (EGS) and highlights the importance of fracture orientation in thermal recovery performance.
Article
Chemistry, Physical
Mustafa Kaan Baltacioglu, Huseyin Yagli, Ceyhun Baydar, Yasin Erdog
Summary: Researchers have explored the generation of electricity from HDRs using Organic Rankine cycles, providing a new pathway for countries with geothermal power, such as Turkey, to obtain green hydrogen. By utilizing the heat from HDRs and injecting water, the potential amount of electricity that can be produced through a single shaft binary organic Rankine cycle was calculated. Furthermore, the study revealed the possibility of hydrogen production through water hydrolysis using electricity generated from renewable energy sources, which can be directly supplied to natural gas lines or used for storage and industrial purposes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
R. Siddharth, Shaik Subhani, Rajendran Senthil Kumar
Summary: The study investigates the flow and heat transfer characteristics of two hot circular bodies in a 2D simulation. By optimizing the geometry, maximum heat dissipation can be achieved. The positioning of the cylinders in the enclosure has a significant impact on heat transfer rate.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Computer Science, Interdisciplinary Applications
Jie Tan, Long Cheng, Guan Rong, Hongbin Zhan, Junsong Quan
Summary: The study found that primary roughness controls low velocity regions and overall flow direction in the fracture, while secondary roughness enhances complexity of flow and promotes eddy formations. The overall heat transfer coefficient is influenced by competing mechanisms of primary and secondary roughness.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Energy & Fuels
Dongyu Wu, Huaidong Zhang, Shaohe Zhang, Jingqiang Tan, Pinghe Sun, Yongjiang Luo, Shuai Gao, Yanhong Xue
Summary: The study focused on the bottom-hole cleaning performance of swirling jet induced by a drill bit nozzle. Computational fluid dynamics simulations were conducted to compare swirling jet with straight jet, showing that swirling jet had poorer cleaning performance than straight jet in removing drilled cuttings.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Plant Sciences
Minghao Du, Jaak Nolvak, Jingqiang Tan, Shijia Gao, Wenhui Wang
Summary: This study presents a new analysis of melanosclerites from the Late Ordovician to earliest Silurian, identifying 12 species and plotting their palaeogeographical occurrences on an up-to-date map. The distribution pattern of these organisms shows a tendency to occur in low-latitude, warm-water regions, mainly confined within the tropics and subtropics. Comparing with Palaeozoic hydroids, both fossils overlap in palaeogeographical distribution, indicating a potential close biological affinity between the two types of organisms.
Article
Engineering, Geological
Jingqiang Tan, Bingbin Xie, Qiao Lyu, Shefa Chen, P. G. Ranjith
Summary: The effects of CO2 and CO2-based fluids imbibition on the mechanical properties of shale are investigated in this study. The results show that the mechanical properties of shale have significant variations after different imbibitions, with the largest effect observed for sub-CO2-water and Sc-CO2-water imbibitions. Pure CO2 saturation has the smallest effect on shale's mechanical properties. The statistical damage constitutive model used in this study can well describe the stress-strain relationship of shale under different soaking conditions.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Lei Chen, Zhenxue Jiang, Shu Jiang, Song Guo, Jingqiang Tan
Summary: The study found that temperature and relative humidity are the main factors affecting the methane adsorption capacity of shale for a single sample. Key findings include: methane adsorption capacity of shale first increases then decreases with depth, reaching a peak at about 1,600-2,400 m; lower relative humidity correlates to greater maximum methane adsorption capacity and greater depth to reach the maximum methane adsorption capacity; a 20% increase of relative humidity results in roughly a 10% reduction of maximum methane adsorption capacity. In conclusion, methane adsorption capacity of shale is predominately affected by water saturation, pore type, and pore size of shale.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Energy & Fuels
Qiao Lyu, Jindong Shi, Jingqiang Tan, Jeffrey M. Dick, Xun Kang
Summary: This study quantitatively describes the effects of deionized water and NaCl solution on shale permeability through permeability tests. The results show that NaCl solution imbibition leads to a stronger and more complex decrease in shale permeability compared to deionized water imbibition. In addition, shale swelling and water-blocking effects increase the sensitivity of shale permeability to pore pressure.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Jingqiang Tan, Chenger Hu, Qiao Lyu, Gan Feng, Shefa Chen
Summary: Through a series of imbibition tests, it was found that fracturing fluids with different pH values have a significant impact on the surface roughness of shale fractures, with alkaline fracturing fluid having the greatest effect. Additionally, the joint homogeneity of shale fractures also changes during the fluid-rock interaction process.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Ecology
Jeffrey M. Dick, Jingqiang Tan
Summary: By combining taxonomic abundances from 16S rRNA gene sequencing datasets with reference microbial proteomes from the NCBI RefSeq database, the carbon oxidation state of estimated community proteomes can be used as a proxy for environmental redox conditions. Analysis of multiple datasets confirms this prediction.
Article
Engineering, Geological
Qiao Lyu, Kaixi Wang, Chenger Hu, Jeffrey M. Dick, Jindong Shi, Jingqiang Tan
Summary: This study investigates the influence of fracturing fluids with different pH values on the mechanical properties of shale. Through soaking experiments and various testing methods, the changes in shale's mechanical properties after different soaking durations and the variations in shale's microstructure are analyzed. The experimental results demonstrate that acid, neutral, and alkaline fluids have significant effects on the strength and Young's modulus of shale, with different trends observed.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Qiao Lyu, Kaixi Wang, Chenger Hu, Jindong Shi, Jingqiang Tan, Guanglei Zhang, Shefa Chen, P. G. Ranjith
Summary: The study explores the effects of supercritical CO2 and water on the mechanical properties of shale, finding that both lead to a decrease in strength with water immersion having a more significant impact. Additionally, it is observed that dynamic pressure imbibition results in more significant changes to the microstructure and mechanical properties of shale.
Article
Geosciences, Multidisciplinary
Zhongliang Ma, Jingqiang Tan, Lunju Zheng, Chunhua Ni, Ruining Hu, Jianfei Ma
Summary: This study reveals the impact of total component fluids from source rock on reservoir transformation during hydrocarbon evolution through simulation experiments. Under closed conditions, the interaction between fluids and feldspar sandstone leads to the alteration of feldspar minerals and the generation of clay minerals, resulting in reservoir tightness. Additionally, a semi-quantitative evaluation method for feldspar dissolution and porosity was established. The geological characteristics of the Yanchang Formation of the Ordos Basin affect the retention effect of diagenetic fluids, and oil and gas exploration should focus on finding sedimentary sand facies bodies favorable for the preservation of primary pores.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Wenquan Xie, Jingqiang Tan, Wenhui Wang, Jianliang Jia, Zhaojun Liu, Jian Wu, Yong Wang, Xueqi Song
Summary: Inertinite in coals contains crucial information on the paleo-wildfire history and its relationship with local ecosystem evolution. This study investigates the Middle Jurassic coal seams of the Shimengou Formation in the Qaidam Basin and identifies abundant evidence of paleo-wildfires, including inertinite and combustion-derived polycyclic aromatic hydrocarbons. These findings confirm the existence of widespread wildfires during the late Middle Jurassic period and suggest a high level of atmospheric oxygen concentration. The study also reveals that incidental mercury emissions from wildfires contribute to the mercury enrichment in coal seams, providing insights into the abnormal enrichment of mercury in coal.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Energy & Fuels
Chenger Hu, Jingqiang Tan, Qiao Lyu, Gan Feng, Jindong Shi, Kaixi Wang, Zhanghu Wang
Summary: This study investigates the interaction between fracturing fluid and shale during hydraulic fracturing. The results show that the fluid-shale reaction is time-dependent, and the dissolved minerals and pH values vary with time. The dissolution of minerals can enhance the porosity and gas adsorption capacity of shale, but secondary precipitation during long-term experiments can block pores and decrease the shale's porosity and hydraulic characteristics.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Environmental Sciences
Jiaqing Zeng, Wenshun Ke, Min Deng, Jingqiang Tan, Chuxuan Li, Yizhi Cheng, Shengguo Xue
Summary: Smelting activities are the main pathway for releasing heavy metals into the soil-groundwater environment. This study conducted a comprehensive investigation of soil from an abandoned Zn smelting site and quantified the factors affecting heavy metal pollution. The results showed severe soil contamination and identified potential pollution sources and soil permeability as the main drivers for heavy metal distribution and accumulation.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Review
Chemistry, Multidisciplinary
Qiao Lyu, Jingqiang Tan, Lei Li, Yiwen Ju, Andreas Busch, David A. Wood, Pathegama Gamage Ranjith, Richard Middleton, Biao Shu, Chenger Hu, Zhanghu Wang, Ruining Hu
Summary: The development of hydraulic fracturing and horizontal drilling techniques has expanded the exploitation of shale gas resources, but potential environmental issues with water usage have prompted research on supercritical carbon dioxide (SC-CO2) as an alternative stimulation fluid. SC-CO2 has shown promise in enhancing shale gas recovery and potentially sequestering CO2 in shale reservoirs, thus reducing carbon emissions. Understanding shale-CO2 interactions and the long-term effects of SC-CO2 injection is crucial for the efficiency and environmental impact of this technology.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)