Article
Environmental Sciences
Philipp Blum, Kathrin Menberg, Fabien Koch, Susanne A. Benz, Carolin Tissen, Hannes Hemmerle, Peter Bayer
Summary: The thermal use of shallow groundwater and its aquifers is on the rise, putting pressure on vulnerable groundwater systems. However, there is a lack of suitable criteria to control the thermal use of groundwater in national and international legislations.
JOURNAL OF CONTAMINANT HYDROLOGY
(2021)
Article
Geosciences, Multidisciplinary
Pei-Chin Wu, Meng (Matt) Wei, Steven D'Hondt
Summary: We measured subsidence rates in 99 coastal cities around the world between 2015 and 2020 and found that in most cities, land is sinking faster than sea level is rising. This poses a significant threat of flooding to these cities much earlier than predicted by sea level rise models. The most rapid subsidence is occurring in Asia, but it is also happening in other continents. Human activity, particularly groundwater extraction, is believed to be the main cause of this subsidence. Expanded monitoring and policy interventions are necessary to reduce subsidence rates and minimize its consequences.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Green & Sustainable Science & Technology
Juan C. Santamarta, Alejandro Garcia-Gil, Maria del Cristo Exposito, Elias Casanas, Noelia Cruz-Perez, Jesica Rodriguez-Martin, Miguel Mejias-Moreno, Gregor Goetzl, Vasiliki Gemeni
Summary: This study investigates the transition from conventional heat production systems to shallow geothermal energy systems in nine touristic infrastructures in the Canary Islands, showing significant energy savings and CO2 emission reductions per installation per year. Shallow geothermal technology offers economical, energetical, and environmental advantages in volcanic islands with high demand for heating and cooling due to tourism.
Article
Geosciences, Multidisciplinary
Xuguo Shi, Shaocheng Zhang, Mi Jiang, Yuanyuan Pei, Tengteng Qu, Jinhu Xu, Chen Yang
Summary: Ground subsidence is a common geohazard in urban areas, with Wuhan experiencing significant issues due to soft foundation subsidence and karst collapse. Utilizing SAR images, the study found a correlation between subsidence in Wuhan and the distribution of engineering geological subregions. Ongoing construction activities were identified as the driving factor behind the subsidence, with subsidence centers shifting with construction intensities.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2021)
Review
Green & Sustainable Science & Technology
Zilong Zhao, Yu-Feng Lin, Andrew Stumpf, Xinlei Wang
Summary: This paper discusses the impact of groundwater on the performance of GHEs, as well as the challenges and strategies for addressing them through industry standard models. Research shows that flowing groundwater enhances GHE performance, but potential adverse effects may arise without proper monitoring and mitigation.
Article
Thermodynamics
Jianqiang Gong, Zheng Li, Wenjuan Zhang, Aowen Hu, Guang Jin
Summary: A heat transfer model for multiple Borehole Heat Exchangers (BHEs) in layered soil is established, and an empirical method for obtaining the total Heat Transfer Rate (HTR) is proposed. It is found that the thermal interaction between boreholes is the largest in the first layer of soil and is influenced by the soil thermal conductivity and seepage velocity. The proposed approach can accurately predict the HTR and optimize the layout of a BHE field.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Sami Ghordoyee Milan, Zahra Kayhomayoon, Naser Arya Azar, Ronny Berndtsson, Mohammad Reza Ramezani, Hamid Kardan Moghaddam
Summary: The Groundwater footprint index (GFI) is a crucial indicator for evaluating the sustainability of groundwater aquifers. Machine learning models can help predict future GFI and support the planning of resilient water consumption. In this study, four models were used to predict GFI for 178 Iranian aquifers, with the inclusion of eight input variables showing the best results.
SUSTAINABLE PRODUCTION AND CONSUMPTION
(2023)
Article
Energy & Fuels
Ze Zhang, Shuhong Wang, Hong Yin, Tianjiao Yang, Pengyu Wang
Summary: Studying the effect of cryogenic fluid seepage on the surrounding rock temperature of high-temperature tunnels is crucial for ensuring rock stability and designing suitable cooling systems. This study establishes a seepage-heat transfer model of a 2D sparse fracture network and applies it to evaluate the temperature field of surrounding rocks in an underground high-temperature tunnel. The findings indicate that fissure seepage can control the distribution of rock temperatures, and key factors affecting the temperature change are identified.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Green & Sustainable Science & Technology
Carlos Baquedano, Alejandro Garcia -Gil, Miguel Angel Marazuela, Ana Maria Carnicer, Juan Carlos Santamarta, Alejandro Mejias Fernandez, Hector Aguilera
Summary: Thermal recycling is a major cause of efficiency loss in groundwater heat pump systems and understanding its effects on system performance is crucial for system design. This study addresses the nonlinearity of the thermal recycling problem using distributed numerical models of groundwater flow and heat transport combined with thermodynamic models of geothermal heat pumps. Simulation results show that thermal interference between production and injection is unavoidable and can lead to the inoperability of the heat pump in certain scenarios. Thermal recycling is also found to increase operation costs and have an environmental impact. The findings of this study improve our understanding of thermal recycling as a complex and transient process that results in efficiency loss in groundwater heat pump systems.
Article
Geochemistry & Geophysics
Bowen Fan, Peng Shi, Zhijun Wan, Yuan Zhang, Luchang Xiong, Songbo Hu, Hong Gou
Summary: This paper analyzes the impact of geothermal water on the airflow temperature field in a mine roadway and proposes methods to improve the thermal environment of water-heated mines, such as laying insulation materials and circulating cold water. The study shows that the temperature of geothermal water upwelling is the main influencing factor on the temperature field of the airflow in the roadway.
Article
Water Resources
Omid Memarian Sorkhabi, Jamal Asgari
Summary: This study investigates the land subsidence and groundwater depletion in the Kabudarahang Plain and the Razan-Qahavand Plain using multi-sensor observations. The results show that the maximum land subsidence rates are 20 mm/year and 30 mm/year respectively, and the groundwater storage variations have a decreasing trend of 78.45 +/- 0.2 million cubic meters/year. The groundwater hydrograph in the study areas also shows a downward trend.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Engineering, Civil
Miguel Angel Marazuela, Alejandro Garcia-Gil, Eduardo Garrido, Juan C. Santamarta, Noelia Cruz-Perez, Thilo Hofmann
Summary: The increasing use of shallow geothermal energy in urban areas is compromising geothermal energy availability and groundwater quality. This study proposes a novel methodology based on polar coordinates to assess the impact of shallow geothermal installations on urban aquifers. The results demonstrate the effectiveness of this methodology in evaluating thermal impacts and facilitating thermal management in cities.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Geological
Da Ha, Gang Zheng, Hugo A. Loaiciga, Wei Guo, Haizuo Zhou, Jinchun Chai
Summary: A large volume of groundwater is extracted annually in Tianjin Municipality for various uses, leading to land subsidence. Installation of field observation wells has been used to monitor the long-term groundwater level, indicating a decline over the past 50 years due to overexploitation in urban and coastal areas.
Article
Geosciences, Multidisciplinary
Xin Wang, Zujiang Luo, Zhao Li, Qian Zhao, Jing Dai
Summary: Groundwater recharge has become a method to prevent land subsidence. A groundwater pumping-recharge test in Cangzhou city, China, was conducted to monitor water level changes and land subsidence. A three-dimensional numerical model was used to analyze the influence of groundwater recharge on the seepage field and displacement field. The results showed that groundwater recharge took a long time to control land subsidence, but it successfully increased water levels and caused the land to rebound.
HYDROGEOLOGY JOURNAL
(2023)
Article
Construction & Building Technology
Lingling Bao, Xue Wang, Pengfei Jin, Junyan Cui, Yuliang Zhu, Yusen Wang
Summary: Ground source heat pump systems, using deep boreholes and heat pumps, are effective for heating buildings but have high development costs. This study establishes an analytical heat transfer model for U-shaped deep borehole heat exchangers, considering geotechnical stratification and seepage phenomena, to reduce development costs and improve performance. The model provides insights into the relationship between thermal performance and various parameters, as well as the influence of seepage on heat extraction performance. It can serve as a reference for developing heat transfer models for buried pipe heat exchangers with groundwater seepage and is an efficient tool for U-shaped deep borehole heat exchanger design and optimization.
JOURNAL OF BUILDING ENGINEERING
(2023)
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)
