Article
Thermodynamics
Yuhao Luo, Guodong Wu, Pengfei Bai, Huawei Wang, Ruipeng Cai, Yifan Tang, Xingliang Chen, Guofu Zhou
Summary: This paper presents mathematical models for two cogeneration units, which have been validated through experiments and optimized. The results show that the heat loss rate is lower and the thermal storage efficiency is up to 80.53% in the designed cogeneration unit.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Cristian Francisco Ramos-Castaneda, Miguel Angel Olivares-Robles, Ana Elisabeth Olivares-Hernandez, Leobardo Hernandez-Gonzalez
Summary: This study investigates the performance of a thermoelectric generator (TEG) considering different leg structures, cooling nanofluids, and segmentation effects. The study shows that the type of cooling nanofluid used, such as TiO2, graphene, or Al2O3, has an impact on TEG performance. It also finds that segmentation of n-type and p-type thermocouples improves efficiency and power output, respectively. The study concludes that quenching of nanofluids and hollow leg structures are beneficial for enhancing TEG performance.
Article
Engineering, Chemical
Cristian Francisco Ramos-Castaneda, Miguel Angel Olivares-Robles, Juan Vicente Mendez-Mendez
Summary: This study investigated the impact of nanofluid use in solar-thermoelectric generators through analysis and simulation, finding that using GNAN coolant can enhance the performance and output power of Solar-TEG systems.
Article
Engineering, Multidisciplinary
Dawei Liang, Z. Q. Zhu, Jianghua Feng, Shuying Guo, Yifeng Li, Anfeng Zhao, Juwei Hou
Summary: In this article, a simplified three-dimensional hybrid thermal model is proposed for investigating the influence of PM segmenting strategies on the temperature distributions and hotspots of surface-mounted PM synchronous machines. The developed model combines lumped-parameter thermal model and analytical method to estimate the 3-D spatial temperature distributions and hotspots for unsegmented and segmented PMs, taking into account the uneven distribution of PM eddy current loss. Through matrix-based post-processing methods, the model maintains high estimation accuracy with a simple mathematical expression. The proposed hybrid analytical modeling method is validated by 3-D electromagnetic-thermal coupled FEA and experiments.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Energy & Fuels
Changxin Liu, Wenxiang Ye, Huaan Li, Jianhao Liu, Cong Zhao, Zhuofan Mao, Xinxiang Pan
Summary: The waste heat recovery system based on TEG-ORC combined cycle enables the cascade utilization of various types of ship waste heat, optimizing the waste heat utilization and improving the safety of ORC operation. The combined system increases the waste heat utilization rate while reducing the power generation cost, with higher thermal efficiency than each individual bottom cycle.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Yajing Sun, Pengcheng Zhai, Shuhao Wang, Bo Duan, Guodong Li, Gang Chen
Summary: This study presents a novel approach combining multi-objective genetic algorithm with finite element method for the multi-parameter and multi-objective optimization of segmented annular thermoelectric generator. The optimization results highlight the importance of emphasizing diversity between p- and n- type TE legs as well as recognizing the different optimal geometrical structures for two types of TE legs, which have been always overlooked in previous researches.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2024)
Article
Construction & Building Technology
Jose Ali Porras-Salazar, Stefano Schiavon, Pawel Wargocki, Toby Cheung, Kwok Wai Tham
Summary: The relationship between air temperature and office work performance is complex and existing models are not accurate in predicting it. Various factors affect the research results, including the diversity of evaluation methods and the inability of temperature alone to fully describe the impact of the thermal environment on individuals.
BUILDING AND ENVIRONMENT
(2021)
Article
Thermodynamics
Zhiying Song, Jie Ji, Zhaomeng Li
Summary: This study investigates the impact of thermoelectric generator (TEG) and structure on system performance, finding that changes in Z value can affect system efficiency and exploring the influence of other parameters on system performance.
Article
Energy & Fuels
Fuxiang Li, Wei Wu
Summary: This study proposes a novel multiphysics framework for realistic performance estimations of photovoltaic (PV) systems. The framework, consisting of an electrical sub-model and a thermal sub-model, is validated and shown to provide reliable performance estimations. Non-linear temperature-efficiency dependence and non-uniform temperature fields are observed in the results, emphasizing the importance of coupled simulation and 3-D simulation. Cross-comparisons with other methods demonstrate the superior performance of the proposed framework, with potential to advance PV system research and development.
Article
Thermodynamics
Jingyang Zhang, Jinxin Geng, Sen Yang, Fengna Cheng, Guiping Zhu, Cong Wang, Zhenxi Yang, Yuanwei Lyu
Summary: By using an ejector to introduce low-pressure, low-temperature air into the aeroengine's air system, the cooling effect of the engine's hot component can be significantly enhanced. Investigating the sensitivity of the ejector's performance to different geometric parameters is important for improving ejector performance and saving space in aeroengines.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Mathematics, Applied
Shi-Chao Xing, Chuanbin Yu, Cun-Fa Gao
Summary: This paper investigates the planar deformation problem of a rigid hollow fiber embedded in a thermoelectric material, obtaining closed-form solutions for the electric, thermal, and elastic fields using the complex variable method. Numerical examinations demonstrate the effects of thermal resistance and geometric parameters of the hollow fiber on temperature and stress distributions. The results suggest that temperature and stress distributions are more sensitive to geometric parameters than thermal resistance, providing guidelines for designing fiber-filled thermoelectric structures.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Thermodynamics
Liaquat Ali Lund, Adnan Asghar, Ghulam Rasool, Ubaidullah Yashkun
Summary: This study investigates the heat transfer characteristics of a magnetized Casson sodium alginate-alumina/copper hybrid nanofluid flowing through a permeable moving plane, taking into account thermal radiation and Joule heating effects. The study focuses on the influence of the velocity ratio parameter on the solid volume fraction and Casson parameter, and examines the velocity and temperature profiles under various conditions. The results show that there are two branch solutions for the velocity ratio parameter, depending on the Casson parameter and copper volume fraction values.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Ede Mehta Wardhana, Hidemi Mutsuda, Yoshikazu Tanaka, Takuji Nakashima, Taiga Kanehira, Shuhei Maeda, Masaaki Yamauchi
Summary: This study proposed a multi-layered TEG model and combined it with a PEG to form a PEG-TEG hybrid harvester, demonstrating improved output voltage by modifying key factors. The experiment showed that the multi-layered TEG can enhance electrical energy output in a smaller device, with vibration amplitude affecting electrical performance and key factors playing a significant role in energy generation.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Engineering, Marine
Min Il Kim, Hyun Sik Yoon
Summary: The study utilizes a deep CNN to modify airfoil shapes for improving L/D ratio, based on surface pressure distributions, and successfully predicts shapes with higher L/D and preferable pressure fields through numerical simulations and Cp distribution modifications.
Article
Thermodynamics
Song Lv, Jiahao Yang, Juwen Ren, Bolong Zhang, Yin Lai, Zhihao Chang
Summary: This research constructs a three-dimensional thermal simulation transient model for evaluating the performance of the PV-TEG-PCM system under fluctuating solar irradiation. The effects of PCM melting temperature, thickness, and thermal conductivity are studied, and the results show that the performance of the PV-TEG-PCM system is superior to other systems.
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.