Review
Green & Sustainable Science & Technology
Yadaba Mahanand, Jnana Ranjan Senapati
Summary: This article reviews the methods and effects of improving the heat transport rate through a solar air heater duct by inserting roughness geometry on the collector plate's heat transfer surface, and provides some optimal parameters and types of roughness geometry.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Review
Environmental Sciences
Piyush Kumar Jain, Atul Lanjewar, Kunj Bihari Rana, Makkhan Lal Meena
Summary: Solar power is a main source of renewable energy. The research focuses on the impact of V-shaped rib roughness on the thermal behavior of solar air heaters, summarizing results and establishing statistical correlations.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Thermodynamics
Jaisree Iyer, Thomas Moore, Du Nguyen, Pratanu Roy, Joshuah Stolaroff
Summary: This study evaluates the flow and heat transfer properties of seven TPMS and PNS based structures in laminar flow regime, showing that these structures have superior heat transfer performance, especially suitable for applications with strict requirements on space and weight.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Karthik Krishnaswamy, Suresh Sivan
Summary: The power output and efficiency of a gas turbine can be improved by using ribs that generate high Thermal Hydraulic Performance (THP) in cooling passages. Experimental results show that V and W-shaped ribs can effectively enhance heat transfer within a certain range of Reynolds numbers, with optimal performance observed at Reynolds number 40000.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Environmental Sciences
Piyush Kumar Jain, Atul Lanjewar, Prem Kumar Chaurasiya, Damodar Tiwari, Vinod Kumar Sharma
Summary: A rough rectangular channel of solar-based air heater was constructed and tested to investigate the heat discharge and frictional behavior of air passing over a roughened surface. The channel's absorber surface was roughed with discrete V-down rib and staggered element roughness, varying the relative rib pitch (P/e) from 6 to 14. Fixed parameters throughout the study included relative gap size, relative staggered element pitch, numeral of gaps, relative staggered element size, and relative rib height. The study revealed that an optimum rise in thermal-hydraulic performance was achieved at a P/e of 10, with the Nusselt number and friction factor reaching up to 2.16 and 2.73 times that of a plane surface, respectively. A correlation for heat transfer function and roughness function was provided to predict the performance of the roughness.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Sanjeev Kumar Yadav, Atul Lanjewar
Summary: The study investigates the effect of symmetric arc roughness with staggered elements used in solar air heater ducts, showing significant enhancement in Nusselt number, friction factor, and thermohydraulic performance. Comparisons with existing best arc roughness geometry were made to evaluate the performance of the investigated roughness.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Mohit Singla, Vishavjeet Singh Hans, Sukhmeet Singh
Summary: Through Computational Fluid Dynamics analysis, it was found that applying rib roughness in a solar evacuated tube collector can significantly enhance the thermo-hydraulic performance, affecting Nusselt number and frictional resistance.
Article
Thermodynamics
Mohamed Hekal, Wael M. El-Maghlany, Yehia A. Eldrainy, Mohammed El-Adawy
Summary: Nowadays, fabric air duct (FAD) systems are the most cost-effective and aesthetically appealing way to evenly distribute heated or cooled air to large open interior spaces. This research aims to develop a proper procedure to calculate the friction factor and Nusselt number of the air flow inside fabric air ducts and to create a validated CFD air distribution model to predict airflow pattern and heat transfer parameters. Experimental assessment of different configurations of fabric air ducts was conducted and empirical correlations were obtained for designing well-balanced FAD systems.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Sanjay Kumar Singh, Ruchin Kacker, Prem Kumar Chaurasiya, Satyam Shivam Gautam
Summary: This study investigates the effects of swirl flow, primary and secondary vortex flow, v-cut, and teeth on a toothed v-cut twisted tape insert on heat transfer rate, friction factor, and performance evaluation criterion. The experiments were conducted on a double pipe heat exchanger and the results show that including teeth on the v-cut enhances the secondary vortex flow and increases the heat transfer rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Teerapat Chompookham, Witoon Chingtuaythong, Suriya Chokphoemphun
Summary: The experimental study involved the insertion of a novel wire coil turbulator, referred to as serrated wire coil (SWC), into a tube heat exchanger to enhance heat transfer performance. Results showed significant improvement in heat transfer efficiency with SWC inserts, supported by developed empirical correlations with acceptable error margins.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Energy & Fuels
Jitendra Singh, Atul Lanjewar
Summary: This study investigates the transient behavior of flowing air underneath the absorber plate of a SAH duct using artificial roughness to increase the heat transfer coefficient (h) between the absorber plate and the fluid. The effect of relative gap width (g/e) on the thermal performance of a roughened SAH duct is revealed. Experimental results comparing the proposed geometry to a smooth SAH duct show improved performance. Various parameters and their optimal values are determined.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Green & Sustainable Science & Technology
Amit Kumar, Akshayveer, Ajeet Pratap Singh, O. P. Singh
Summary: This paper investigates a new curved design of a counter flow double-pass solar air heater with arched baffles placed in the second duct. The introduction of arched baffles accelerates the flow near the absorber and facilitates the formation of large secondary vortices, resulting in enhanced thermal and hydraulic performance. The study also develops two regression correlations for predicting the thermo-hydraulic performance based on geometric and flow parameters.
Article
Chemistry, Physical
Poongavanam Ganesh Kumar, V. S. Vigneswaran, Vinothkumar Sivalingam, R. Velraj, Seong Cheol Kim, Vanaraj Ramkumar
Summary: Deionized water and activated carbon nanofluids were produced at different volume concentrations, and the structural properties and thermal exchange properties of these nanofluids were evaluated. The addition of activated carbon nanoparticles significantly improved the thermal conductivity and specific heat of the nanofluids. In a car radiator, the addition of activated carbon nanoparticles increased the Nusselt number and decreased the Reynolds number.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Green & Sustainable Science & Technology
Hwi-Ung Choi, Kwang-Am Moon, Seong-Bhin Kim, Kwang-Hwan Choi
Summary: This study investigated the impact of a ribbed fin, proposed by the authors, on the heat transfer and flow characteristics of fluid in a solar air heater. The ribbed fin features a rectangular rib on its base and side surfaces, increasing the heat transfer coefficient and the heat transfer area. Simulation experiments were conducted with different Reynolds numbers, relative heights, and rib pitches. The ribbed fin improved heat transfer performance by 3.497 times compared to a smooth fin, but also led to increased pressure drop. The study also developed correlations for the Nusselt number and friction factor based on the rib's geometry and Reynolds number, with accurate predictions and low errors.
Article
Thermodynamics
H. Harish, K. Manjunath
Summary: This research compares the flow and heat transfer properties of water with circular protruded twisted-tape inserts to those with traditional twisted tapes. The study found that circular protruded twisted-tape inserts provide higher thermal enhancement and lower friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
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.