Article
Chemistry, Multidisciplinary
Vincenzo Ballerini, Eugenia Rossi di Schio, Paolo Valdiserri, Claudia Naldi, Matteo Dongellini
Summary: This paper investigates the possibility of using solar energy to provide power for ground-source heat pumps, in order to increase the energy efficiency of renewable energy plants. By utilizing seasonal thermal energy storage technology, intermittent solar energy collected and stored during the summer months can be used to meet high heating demand in winter. The results show that the combination of solar collectors and ground-source heat pumps can greatly improve the seasonal coefficient of performance of heat pumps and reduce the use of probes.
APPLIED SCIENCES-BASEL
(2023)
Article
Thermodynamics
Richard A. Beier, Marco Fossa, Stefano Morchio
Summary: Ground source heat pumps are often coupled with vertical boreholes for heating and cooling buildings. Numerical simulations were conducted to study the impact of deeper boreholes on TRT analysis, showing wider ranges of undisturbed ground temperature and ground thermal conductivity. The study found that effective ground thermal conductivities varied within +/- 17% of the arithmetic average of the layer thermal conductivities.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Geological
Despina M. Zymnis, Andrew J. Whittle
Summary: The use of ground source heat pumps with borehole heat exchangers is an energy efficient technique for space heating and cooling, but careful evaluation of soil behavior is necessary in urban environments to ensure long-term performance and minimize negative effects on nearby structures. A sophisticated soil model integrated in a finite difference framework was used to study thermo-hydro-mechanical problems, showing that significant settlements can occur over periods of 10 to 50 years. The parametric study offers valuable guidelines for heat exchanger design and identifies optimal solutions to meet foundation settlement criteria.
CANADIAN GEOTECHNICAL JOURNAL
(2021)
Article
Energy & Fuels
Yu Zhou, Asal Bidarmaghz, Nikolas Makasis, Guillermo Narsilio
Summary: Ground-source heat pump systems utilize the ground for heat exchange and this study developed a 3D finite element model for horizontal ground heat exchangers. The study evaluated the performance and effects of variable trench separations and GHE configurations, finding that compromises on trench separation should be made first when land is limited.
Article
Thermodynamics
Y. Guo, G. Huang, W. V. Liu
Summary: Existing analytical solutions for vertical borehole heat exchangers (BHEs) in a multilayered ground often assume a constant heat transfer rate at the borehole wall, but in reality, the heat transfer rate varies along the length of the borehole. To address this, a new semi-analytical solution called the MVQ solution-Multilayered ground with Varying heat transfer rates (Q) was proposed and verified against a 3-D finite-element model. The results showed that the MVQ solution had a low mean absolute percent error (MAPE) for the average borehole wall temperature, while the conventional solution potentially overpredicted the temperature. The study also found that the variation in ground thermal properties intensified the heat transfer rate along the borehole length, highlighting the importance of the MVQ solution for thermal performance predictions and design of BHE systems in shallow geothermal applications.
Article
Thermodynamics
Xianwen Huang, Zhishu Yao, Haibing Cai, Xinwei Li, Hanqing Chen
Summary: The study introduces an analytical solution for coaxial borehole heat exchangers considering ground non-uniformity, temperature gradient, and other factors that affect heat exchange efficiency. Results show that factors such as ground non-uniformity and temperature gradient significantly impact the heat exchange efficiency of CBHEs.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Energy & Fuels
Arif Widiatmojo, Youhei Uchida, Hikari Fujii, Hiroyuki Kosukegawa, Isao Takashima, Yutaro Shimada, Srilert Chotpantarat, Punya Charusiri, Trong Thang Tran
Summary: Southeast Asian countries have seen rapid economic growth over the past few decades, leading to increased energy demand per capita. Ground source heat pumps are considered a solution to improve energy efficiency, but face challenges in the region due to larger cooling demand and smaller temperature differences. The study evaluated the first thermal response test results in Bangkok and Hanoi, establishing borehole heat exchanger models and assessing the performance of a ground source heat pump in specific climatic conditions.
Article
Energy & Fuels
Taha Arghand, Saqib Javed, Jan-Olof Dalenback
Summary: This study examines the potential combination of direct ground cooling with district heating and ground source heat pumps, comparing the required borehole depths and drilling areas. The findings indicate that the combination of direct ground cooling and district heating requires shorter borehole depths and also provide insights into optimizing investment costs and drilling areas.
Article
Engineering, Geological
Yi Qiu, Tianshou Ma, Nian Peng, Jinhua Liu, P. G. Ranjith
Summary: This study establishes a pseudo three-dimensional finite element model that considers complete material anisotropy and analyzes the effects of different types of anisotropy on wellbore stability, including elastic anisotropy, thermal expansion coefficient anisotropy, permeability anisotropy, thermal osmosis coefficient anisotropy, and thermal conductivity anisotropy. The results show that elastic anisotropy has the greatest impact on wellbore stability.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Kexun Wang, Tishi Huang, Wenke Zhang, Zhiqiang Zhang, Xueqing Ma, Leyao Zhang
Summary: This study aimed to investigate the impact of different working fluids on the performance of medium-shallow BGHEs. A heat transfer model for medium-shallow BGHEs was established and validated using experimental test data. The results showed that CO2 was the most suitable working fluid, and isobutane achieved the highest net heat and emission reduction. Furthermore, the influence of different working fluids and the number of boreholes on the heat transfer performance of BGHEs was analyzed.
Article
Green & Sustainable Science & Technology
Kimmo Korhonen, Abel Marko, Alan Bischoff, Mark Szijarto, Judit Madl-Szonyi
Summary: Deploying shallow geothermal solutions is crucial for meeting energy demands and decarbonisation targets, especially in urban areas. This paper presents a novel method, the infinite borehole field model, for estimating the technical shallow geothermal potential. The method considers thermal interactions between boreholes, using finite element models and mathematical optimisation to determine the annual thermal energy extraction while maintaining borehole wall temperature above freezing point. The results show the potential for significant energy production, with deeper, thermally independent boreholes performing better than those in an infinite borehole field.
Review
Thermodynamics
Seama Koohi-Fayegh, Marc A. Rosen
Summary: By coupling ground heat exchangers with heat pumps, heat can be stored underground in the summer and utilized in the winter, improving efficiency and reducing environmental impact. There is currently a strong focus on utilizing ground heat pumps for heating and cooling buildings, with the development and optimization of modeling systems.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2021)
Article
Energy & Fuels
Shunsuke Tsuya, Hikari Fujii, Hiroyuki Kosukegawa, Kanako Yamashita, Saeid Mohammadzadeh Bina
Summary: The effect of pumping well operations on the performance of a borehole heat exchanger was evaluated in this study. The results showed that pumping well operations can enhance the performance of the ground source heat pump system, and a higher pumping rate can improve the heat exchange capacity of the borehole heat exchanger. Furthermore, installing a borehole heat exchanger in an area with natural groundwater flow can further enhance its performance.
Article
Thermodynamics
Aminhossein Jahanbin, Giovanni Semprini, Beatrice Pulvirenti
Summary: This study comprehensively investigates the performance of various nanofluids in single U-tube borehole heat exchangers (BHEs). The results show that Ag- and Cu-based nanofluids exhibit the highest heat transfer enhancement with a trade-off of higher pressure drop and required pumping power. SiO2- and TiO2water nanofluids have the lowest thermal performance but also the lowest pressure drop. A simple equation is proposed to evaluate the outlet fluid temperature for nanofluids. The study also finds that using nanofluids to reduce BHE length is not a promising choice.
APPLIED THERMAL ENGINEERING
(2022)
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
Thermodynamics
Claudia Naldi, Enzo Zanchini
APPLIED THERMAL ENGINEERING
(2018)
Article
Energy & Fuels
Enzo Zanchini, Aminhossein Jahanbin
Article
Energy & Fuels
Enzo Zanchini, Aminhossein Jahanbin
Article
Green & Sustainable Science & Technology
Marco Fossa, Antonella Priarone
Article
Energy & Fuels
Claudia Naldi, Enzo Zanchini
Article
Thermodynamics
Enzo Zanchini, Claudia Naldi
Article
Energy & Fuels
Claudia Naldi, Enzo Zanchini
Article
Green & Sustainable Science & Technology
M. Fossa, A. Priarone, F. Silenzi
Article
Education, Scientific Disciplines
Enzo Zanchini
Summary: Exergy analysis is gaining increasing attention in the field of thermodynamics. It represents the maximum useful work that a system can generate when interacting with its surroundings. This analysis includes two types of exergy: one related to matter contained within a reference environment and the other related to matter flowing in a pipe. Deriving the expressions for exergy and flow exergy is often complex and specific to certain systems. In this paper, the authors provide a simplified and general deduction of these expressions and show how it can facilitate a deeper understanding of energy balance equations.
EUROPEAN JOURNAL OF PHYSICS
(2023)
Article
Thermodynamics
Enzo Zanchini, Claudia Naldi, Matteo Dongellini
Summary: In this paper, a new method using dimensionless fluid-to-ground functions is proposed for the design of borehole heat exchangers. The method allows for direct calculation of fluid temperature evolution and is characterized by accuracy, speed, and simplicity. The validity of the method is confirmed through comparisons with analytical solutions.
APPLIED THERMAL ENGINEERING
(2023)
Proceedings Paper
Thermodynamics
C. Naldi, E. Zanchini
36TH UIT HEAT TRANSFER CONFERENCE
(2019)
Article
Multidisciplinary Sciences
Gian Paolo Beretta, Enzo Zanchini
ATTI ACCADEMIA PELORITANA DEI PERICOLANTI-CLASSE DI SCIENZE FISICHE MATEMATICHE E NATURALI
(2019)
Article
Thermodynamics
Federico Silenzi, Antonella Priarone, Marco Fossa
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2018)
Article
Energy & Fuels
Enzo Zanchini, Aminhossein Jahanbin
Proceedings Paper
Thermodynamics
C. Naldi, E. Zanchini
34TH UIT HEAT TRANSFER CONFERENCE 2016
(2017)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.