Article
Geosciences, Multidisciplinary
Adinda van de Ven, Roland Koenigsdorff, Peter Bayer
Summary: This study evaluates the suitability of the analytical infinite moving line source model in determining the temperature of vertical grouted borehole heat exchangers in the presence of horizontal groundwater advection. The analysis shows that the deviation between finite and infinite MLS is less than 5% for BHEs deeper than 30 meters. Additionally, a correction function has been developed to address discrepancies in the dimensioning of BHEs by the infinite MLS model.
Article
Thermodynamics
Junhao Shen, Chaohui Zhou, Yongqiang Luo, Zhiyong Tian, Shicong Zhang, Jianhua Fan, Zhang Ling
Summary: This study introduces an analytical model based on the Segmented Finite Line Source (SFLS) method to analyze the heat transfer process of a U-type deep borehole heat exchanger (UDBHE). The model is validated by comparing it with experimental data. Results show that the heat extraction capacity of the UDBHE is influenced by design and operation parameters such as the thermal conductivity of the backfill material, pipe diameter, and flow rate.
Article
Thermodynamics
Mohammed A. Hefni, Minghan Xu, Ahmad F. Zueter, Ferri Hassani, Mohamed A. Eltaher, Haitham M. Ahmed, Hussein A. Saleem, Hussin A. M. Ahmed, Gamal S. A. Hassan, Khaled I. Ahmed, Essam B. Moustafa, Emad Ghandourah, Agus P. Sasmito
Summary: We propose a novel three-dimensional analytical framework that accurately predicts and evaluates the thermal performance of geothermal borehole systems with single or multiple heat exchangers. The model includes solving the radial and axial temperature profiles, as well as extending to a three-dimensional arrangement. The framework enables accurate and efficient prediction of transient temperature profiles for geothermal boreholes, facilitating thermal design and implementation of geothermal systems.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Janvier Domra Kana, Noel Djongyang, Aretouyap Zakari, Njeudjang Kasi, Danwe Raidandi, Philippe Njandjock Nouck, William Teikeu Assastse, Tabod Charles Tabod
Summary: This paper focuses on the regional-scale assessment of low-enthalpy resources for cooling and heating in the Subsaharan area in Central Africa. By conducting ground investigations and using Geographic Information System, suitable locations for Ground Source Heat Exchanger and groundwater heat exchanger have been identified to reduce greenhouse gas emissions and save energy consumption.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Construction & Building Technology
Yunting Guo, Xincheng Hu, Jonathan Banks, Wei Victor Liu
Summary: Ground temperature prediction is essential for the design of borehole heat exchanger systems. The moving finite line source solution can help calculate ground temperature for borehole fields. Neglecting buried depth may lead to an over-prediction of exploitable heat in borehole fields.
ENERGY AND BUILDINGS
(2021)
Article
Green & Sustainable Science & Technology
Yongqiang Luo, Guozhi Xu, Nan Cheng
Summary: The study proposed a novel stratified segmented finite line source method (SS-FLS) for simulating the temperature field of deep borehole heat exchangers, which was validated and found to be accurate and robust through comparisons with actual engineering project data. Additionally, the study investigated the effects of stratification on soil and fluid temperature fields.
Article
Thermodynamics
Yaran Wang, Yeming Wang, Shijun You, Xuejing Zheng, Shen Wei
Summary: Geothermal energy is a promising renewable source for district heating. A method to optimize the water flow rates in the coaxial deep borehole heat exchanger of a ground source heat pump system is proposed in this study. The results of the comparison of system operation before and after optimization show that the method has a significant effect on energy-saving operation.
APPLIED THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Yongqiang Luo, Nan Cheng, Guozhi Xu
Summary: This study proposes a stratified-seepage-segmented finite line source method (S-3-FLS) for the heat transfer analysis of deep borehole heat exchangers (DBHE). The method is validated through comparison with numerical models and real project data, showing its high computational speed, robustness, and flexibility. The model can be used for dynamic heat extraction and recovery analysis, as well as DBHE array analysis.
ENERGY AND BUILDINGS
(2022)
Article
Energy & Fuels
Philippe Pasquier, Louis Lamarche
Summary: This study revisits the known analytical expressions of the Hantush well function and generalized incomplete gamma function, and establishes a clear link between these functions and the moving infinite line source model. Two new exact analytical expressions and two new first-order approximations are proposed, which can achieve relative errors less than 1% with high accuracy and fast convergence.
Article
Engineering, Civil
Fujiao Tang, Hossein Nowamooz, Dawei Wang, Jin Luo, Wanli Wang, Xiaoguang Sun
Summary: This study investigated the relationship between the Heat Extraction Rate (HER) and influencing factors of a Borehole Heat Exchanger (BHE) using four Machine Learning algorithms, with Polynomial Regression (PR) showing the best performance and accuracy in predicting the BHE's performance.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Construction & Building Technology
C. Castan-Fernandez, G. Marcos-Robredo, M. P. Castro-Garcia, M. A. Rey-Ronco, T. Alonso-Sanchez
Summary: Geothermal backfill plays a crucial role in geothermal energy systems, and choosing the right materials can improve system efficiency, reduce energy costs, and have economic and environmental significance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Joanna Piotrowska-Woroniak
Summary: This study aimed to verify specific ground thermal efficiency indicators adopted for the design of the lower heat source of borehole heat exchangers (BHE) through experimental tests. The research compared and analyzed the operating parameters of BHEs, including thermal energy absorption, temperature differentials, brine flow rates, and power output in two heating seasons. The data obtained in real conditions is valuable for the research and development of BHE systems.
Article
Engineering, Civil
Matteo Antelmi, Luca Alberti, Sara Barbieri, Sorab Panday
Summary: This study explored a more efficient computational method for simulating a ground thermal field by using the MODFLOW-USG code and adapting the CLN package. The results showed that the exchanged energy by a BHE increases with groundwater flow velocity according to literature studies. The implementation of a borefield with 7 BHEs in a numerical model was done in a more expeditious and efficient way without any additional computational effort.
JOURNAL OF HYDROLOGY
(2021)
Article
Energy & Fuels
Haijiang Zou, Siyu Guo, Ruifeng Wang, Fenghao Wang, Zhenxing Shen, Wanlong Cai
Summary: In this study, a comprehensive numerical model of a BHE system is established using OpenGeoSys software coupled with TESPy toolkit, and the load shifting behaviors between BHEs with different design parameters are studied. The results show that the outlet temperature of single BHE and BHE array generally increases, and the soil temperature around the BHE accumulates unbalanced heat. The behavior of load shifting is weakened with the increase of inter-borehole spacing, and the load shifting behavior is more significant in a more intensive layout.
Article
Construction & Building Technology
Liangliang Guo, Jian Zhang, Yanrong Li, John McLennan, Yanjun Zhang, Haiyang Jiang
Summary: This paper conducted field tests in Tangshan, China to investigate the impact of groundwater flow on the thermal performance of borehole heat exchanger (BHE). The study found that an increase in groundwater velocity leads to higher thermal conductivity and heat transfer rates in the ground. Simulation results showed that improvements in thermal conductivity of borehole and groundwater velocity are essential to enhance the heat transfer effect of BHE under natural conditions. Additionally, artificial transformation of local formations is needed to increase groundwater velocity and aquifer thickness.
ENERGY AND BUILDINGS
(2021)
Article
Energy & Fuels
Selcuk Erol, Virginie Harcouet-Menou, Ben Laenen, Peter Bayer
Summary: The major challenges of deep geothermal systems include drilling costs, induced seismicity, scaling and corrosion, emissions, and assessment of the inherent uncertainty associated with the reservoir properties. This study focuses on investigating the concept of using a single drill hole for thermal energy provision in detail, particularly in reservoirs with low natural permeability.
Article
Energy & Fuels
Selcuk Erol, Peter Bayer, Taylan Akin, Serhat Akin
Summary: The interpretation of tracer tests in geothermal reservoirs is often carried out using simplified analytical solutions or complex numerical models. This study presents an advanced workflow that combines a 3D analytical model with Monte-Carlo simulations and a 3D numerical model to evaluate tracer test data in large-scale reservoirs. The results demonstrate the robustness of the workflow in estimating effective parameters in complex reservoir systems with anisotropic flow paths.
Review
Environmental Sciences
Julia Becher, Constanze Englisch, Christian Griebler, Peter Bayer
Summary: Understanding the impact of urban pollution on groundwater fauna is crucial, but current knowledge is limited due to various interfering factors and the need for standardized and long-term testing.
JOURNAL OF CONTAMINANT HYDROLOGY
(2022)
Review
Environmental Sciences
Maximilian Noethen, Hannes Hemmerle, Peter Bayer
Summary: Anthropogenic warming of the atmosphere is a pressing challenge in the 21st century, but knowledge on subsurface warming is lacking. This review proposes a classification based on heat source geometry, scale, process, and intention of heat release. It explores the intensities of subsurface warming, heat flux density, and implications for processes and ecosystems, as well as the potential of recycling waste heat with geothermal installations.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Hannes Hemmerle, Grant Ferguson, Philipp Blum, Peter Bayer
Summary: Meeting the rising energy demands of cities is a global challenge. Recent research reveals the long-term increase of temperatures in the groundwater beneath Cologne, Germany and finds that the geothermal resources in urban areas are largely underused.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Cecile Coulon, Jean-Michel Lemieux, Alexandre Pryet, Peter Bayer, Nathan L. Young, John Molson
Summary: This study presents a methodology for pumping optimization under uncertainty for island freshwater lenses using a sharp-interface model and demonstrates its application in a real case. Pumping optimization was conducted considering parameter and observation uncertainty, with a focus on avoiding well salinization due to upconing.
WATER RESOURCES RESEARCH
(2022)
Article
Multidisciplinary Sciences
Susanne A. Benz, Kathrin Menberg, Peter Bayer, Barret L. Kurylyk
Summary: Despite the global interest in green energy alternatives, little attention has been paid to the feasibility of recycling the ground heat accumulated due to urbanization, industrialization, and climate change. This study shows the theoretical potential of this heat on a multi-continental scale and highlights the importance of considering subsurface heat recycling in the move to a low-carbon economy in a warmer world.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
Christoph Bott, Mathias Ehrenwirth, Christoph Trinkl, Peter Bayer
Summary: This study employs a flexible, component-based model called STORE to investigate design scenarios and evaluate the performance and impacts of seasonal thermal energy storage. The results show that different designs have different performances, and the optimal design should focus on external cover and top insulation. The capability of STORE to rapidly analyze various scenarios proves its high applicability in optimizing the planning processes of seasonal thermal energy storage projects.
APPLIED THERMAL ENGINEERING
(2022)
Editorial Material
Environmental Sciences
Peter Bayer, Philipp Blum
Article
Green & Sustainable Science & Technology
Tiansheng Zhang, Chun Liu, Peter Bayer, Liwei Zhang, Xulong Gong, Kai Gu, Bin Shi
Summary: This study measured the shallow temperatures down to a depth of 100 m in 19 closed boreholes in Nanjing, China, for one year, aiming to understand the subsurface thermal regime and its influencing factors. The results showed that surface temperatures were most dynamic and influenced by air temperature, while temperatures remained stable at depths of 10-20 m. Geological and hydrological conditions played a primary role in affecting subsurface heat flux and loss, with urban land cover change and enhanced heat release from urbanization contributing to a subsurface urban heat island. The monitoring concept used in this study can provide continuous profiles of subsurface temperature and serve as a reference for city-wide geothermal monitoring in other urban areas.
Article
Water Resources
Lukas Roemhild, Gianluca Fiandaca, Linwei Hu, Laura Meyer, Peter Bayer
Summary: This study presents a new inversion procedure that allows for the direct computation of hydraulic conductivity (K) in an aquifer using induced polarization (IP) data. The novel approach was successfully implemented and showed a similar quality compared to hydraulic tomography. The results highlight the accuracy of the inversion and the significance of the proposed calibration strategies.
ADVANCES IN WATER RESOURCES
(2022)
Article
Engineering, Environmental
Bo Zhang, Kai Gu, Peter Bayer, Fulin Xiang, Zhuang Wei, Baojun Wang, Bin Shi
Summary: This study aims to develop a convenient method to investigate vertical water flow in slopes on the sub-meter scale. The method is successfully validated in a laboratory tank with a series of experiments and has the ability to estimate flow rates greater than 1.0 x 10(-6) m.s(-1) and identify the influence of moving water on thermal profiles even at a flow rate of 1.0 x 10(-7) m.s(-1).
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Environmental Sciences
Bo Zhang, Kai Gu, Peter Bayer, Haibo Qi, Bin Shi, Baojun Wang, Yuehua Jiang, Quanping Zhou
Summary: The thermal response test (TRT) establishes a relationship between groundwater flow rate and temperature response curve. To minimize the borehole effects in the test, practical solutions for in situ heating and temperature sensing are needed. Numerical models were used to study the effect of grout and jacket on the simulated thermal response, and these findings were applied to develop groundwater flow rate estimation procedures. The developed approach was successfully applied in a case study, validating its applicability in the field.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Lisa Maria Ringel, Mohammadreza Jalali, Peter Bayer
Summary: In this study, the authors used a stochastic inversion method to infer the structural and hydraulic properties of a highly fractured zone at the Grimsel Test Site in Switzerland. The results revealed the presence of two preferential flow paths, with an increased probability of fractures linking the paths as the distance to the second injection borehole decreased.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Green & Sustainable Science & Technology
Arslan Ahmed, Fosca Conti, Peter Bayer, Markus Goldbrunner
Summary: Snowfall and ice formation on road surface can be a safety hazard for driving, and the traditional methods of using salt and de-icing chemicals have environmental and economic disadvantages. Hydronic road heating systems, which circulate a mixture of ethanol and water under the asphalt, provide a valid alternative. This study compares the environmental impact of using salts versus using a road heating system, and the results show that the heating system emits less CO2 over its lifetime.
ENVIRONMENTAL AND CLIMATE TECHNOLOGIES
(2022)
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)
