Article
Thermodynamics
Yang Guo, Junfeng Guo, Wei Yang, Pengju Zhao, Yonggui Zhou, Rongbin Deng, Zunlong Jin
Summary: To study the heating performance and practical application problems of a R410A SCVI heat pump in an electric bus operating in cold regions, experimental tests were conducted. Factors such as ambient temperature, compressor speed, vapor-injection mass flow ratio, and indoor air temperature were considered. The results showed that increasing the compressor speed improved the heating capacity of the system, but decreased the coefficient of performance (COP). The vapor-injection heat pump (VIHP) demonstrated better heating performance and was more suitable for electric buses in cold regions.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Hong Zhang, Qian Liu, Lichen Yang
Summary: A novel solar-air dual-source vapor injection heat pump air-conditioner for electric buses has been developed to improve system heating performance and increase vehicle endurance. Through simulation analysis, it was found that the system outperforms traditional vapor injection heat pumps in terms of heating capacity and efficiency. The dual-source heating mode was found to be preferred in most situations, except when solar radiation is extremely low or absent.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Construction & Building Technology
Wenzhe Wei, Long Ni, Qian Dong, Wei Wang, Jiayu Ye, Laifu Xu, Yahua Yang, Yang Yao
Summary: During the defrosting process in cold regions, injecting medium-pressure vapor refrigerant into the compressor of an air source heat pump can effectively improve defrosting efficiency. Experimental results show that an optimal opening of the injection electronic expansion valve exists, leading to reduced defrosting time, power consumption, and improved defrosting efficiency.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Xiaoli Yu, Ruicheng Jiang, Guodong Lu, Hao Liu, Yuxiang Tong, Gao Qian, Rui Huang, Zhi Li
Summary: The performance of refrigerant-side HPAC-WHR system is the best in low-temperature and low-waste heat conditions, while the condenser-side HPAC-WHR system performs the best in high-temperature and high-waste heat conditions. By combining the advantages of both systems, a novel HPAC-WHR system is designed with a performance improvement of 18.9% in COPcom and a reduction of 14.7% in life-cycle carbon emissions, with only a 2.1% increase in comprehensive cost.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Zhengrong Li, Yongheng Du, Yuqin Pan, Fan Zhang, Zhaofeng Meng, Yanan Zhang
Summary: This paper investigates the heating performance of a solar-assisted enhanced vapor injection air-source heat pump (SC-EVIHP) system in cold regions. The experimental results show that the system is greatly affected by solar radiation intensity, and compared with conventional systems, it has significantly improved heating capacity and COP values.
Article
Thermodynamics
Sangwook Lee, Yoong Chung, Yeonwoo Jeong, Min Soo Kim
Summary: This study proposes a multi-level waste heat recovery system using vapor-injection technique. The results show that this system significantly enhances heating capacity and can utilize ambient air sources under any operating condition.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Ehsan Afrasiabian, Roy Douglas, Marco Geron, Gareth Cunningham
Summary: Since the COVID-19 pandemic outbreak, public transportation networks have faced unprecedented challenges. In order to address safety concerns, a novel recovery heat pump concept has been proposed, which can simultaneously tackle airborne transmission and energy efficiency issues. The study found that implementing an all-fresh air policy and adopting the recovery concept can significantly improve ventilation rates and energy saving effects.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Zhihang Zheng, Jin Zhou, Feng Xu, Rongpeng Zhang, Guang Deng
Summary: This study investigates the performance and feasibility of a PV-assisted ground source heat pump and air source heat pump system in hot summer and cold winter regions of China. The results show that the PVGSHP-ASHP system can effectively address load imbalance issues and achieve higher system efficiency, while also reducing costs.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Liping Pang, Desheng Ma, Kun Luo, Xiaodong Mao, Yanping Yuan
Summary: An Integrated Thermal Management System (ITMS) based on waste heat recovery is proposed for helicopters to satisfy heating and refrigerating demands, showing significant performance advantages in different climate conditions.
Article
Thermodynamics
Yi Fan, Jing Li, Xudong Zhao, Steve Myers, Yuanda Cheng, Min Yu, Yousef Golizadeh Akhlaghi, Xiaoli Ma, Sen Yu
Summary: This study presents a proof-of-concept of a novel ventilation heat recovery vapor injection air source heat pump. The prototype demonstrates enhanced performance by significantly improving efficiency and reducing electricity consumption, with a fast and efficient defrosting process using exhaust air.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Haimin Wang, Zhiyuan Ji, Chuanwei Wang, Zexu Zhu, Yifan Wang, Hao Lin
Summary: The novel solution of coupling the secondary loop and vapor injection technology (SL + VPI) using propane as a refrigerant shows promising results in improving heating performance and driving range in cold climate.
APPLIED THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Yunseok Jang, Dongchan Lee, Jinyoung Kim, Se Hyeon Ham, Yongchan Kim
Summary: A waste-heat recovery water-source heat pump system has been proposed in this study, combining data centers and residential areas, which significantly reduces energy consumption, enhances system performance, and decreases CO2 emissions.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Jijin Wang, Dehu Qv, Long Ni
Summary: This study compares the performance of two different throttle valve technologies in air source heat pump systems, finding that using pulse width modulation driven solenoid valve combined with a capillary to control vapor-injection can operate in a wider temperature range and reduce the risk of hunting problems.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Yuan Wei, Shuilong Liu, Jianlin Yu
Summary: This paper proposes a vapor injection heat pump cycle with indirect heat recovery, which improves the performance of the cycle by adding a sub-cooler and an evaporator. The results show that the cycle has higher heating capacity and coefficient of performance under the same operating conditions. Additionally, lower ambient temperatures and higher fresh air ratio can also enhance the performance of the cycle.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Green & Sustainable Science & Technology
Sangmu Bae, Hobyung Chae, Yujin Nam
Summary: To address the challenges of complicated installation process and high initial cost faced by photovoltaic-thermal (PVT)-ground source heat pump (GSHP) systems in urban areas or existing buildings, this study proposes an integrated PVT-air source heat pump (ASHP) system that can be installed in limited space and reduces the initial cost. The performance evaluation of a real-scale experimental plant constructed based on a small-scale building shows that the PVT-ASHP system achieves similar heating and cooling performance compared to the PVT-GSHP system at a lower initial cost.
Article
Thermodynamics
Mingyu Quan, Yingai Jin, Shijuan Yan, Yuying Yan
Summary: The paper discusses how power plants in China and other places burn multiple types of coal to consider transportation costs and limited coal reserves. By analyzing coal quality and designing air distribution modes, the study aims to improve thermal efficiency and reduce NOx emissions.
HEAT AND MASS TRANSFER
(2022)
Article
Nanoscience & Nanotechnology
Qin Chen, Yatao Ren, Hong Qi, Yuying Yan
Summary: This paper investigates the optical characteristics of nanoparticle aggregates as potential theranostic nanoplatforms and proposes a simple hybrid theranostic nanoagent consisting of different nanosphere clusters. The hybrid agent shows high absorption and low scattering in the first near-infrared window (NIR-I) and high scattering and near-zero absorption in the second NIR (NIR-II), which can be beneficial for tumor diagnosis and treatment.
Article
Energy & Fuels
Ding Luo, Yuying Yan, Ying Li, Ruochen Wang, Shan Cheng, Xuelin Yang, Dongxu Ji
Summary: This study proposes a hybrid transient CFD-thermoelectric numerical model to predict the dynamic response characteristics of an automobile thermoelectric generator system. Through transient numerical study, it is found that the dynamic output power changes smoothly while the conversion efficiency fluctuates greatly. The findings contribute to a better understanding of the dynamic response characteristics of the automobile thermoelectric generator system.
Article
Thermodynamics
Shuai Zhang, Yuying Yan
Summary: This study conducted a comprehensive analysis on the energy, exergy, and economic aspects of using ceramic foam/molten salt composite phase change material (CPCM) for medium-and high-temperature thermal energy storage systems. The results showed that the melting rate and energy storage rate were significantly improved with the use of ceramic foam-enhanced molten salt. The exergy efficiency of CPCMs was also higher than that of pure PCM. Additionally, the economic analysis indicated the feasibility of CPCMs with certain porosities within a certain price range. This study is of great importance for the large-scale application of ceramic foam in thermal energy storage.
Article
Mechanics
Wenning Zhou, Yufu Xing, Xunliang Liu, Yuying Yan
Summary: In this study, a multi-relaxation time phase-field lattice Boltzmann model is proposed for simulating droplet dynamics with soluble surfactants. The accuracy and validity of the model are verified by benchmark tests, and the effects of surfactant, capillary number, and density ratio on droplet deformation and interaction are investigated. The simulation results show that the inhomogeneous distribution of surfactant generates Marangoni stress, which promotes droplet deformation and hinders droplet coalescence. Within the studied range, droplets deform more easily with a decrease in density ratio, while an increase in capillary number and surfactant concentration promotes droplet deformation and breakup. Moreover, a higher surfactant concentration results in a thicker liquid film between droplets, hindering their coalescence.
Article
Thermodynamics
Ding Luo, Yuying Yan, Ying Li, Wei-Hsin Chen, Xuelin Yang, Xuehui Wang, Bingyang Cao
Summary: This study evaluates the dynamic performance of a simplified automobile thermoelectric generator under different driving cycles and provides guidance for the application of automobile thermoelectric waste heat recovery. The findings suggest that the dynamic output power of the generator exhibits smoother fluctuations compared to exhaust temperature and displays hysteresis in its response, while the dynamic conversion efficiency experiences sharp fluctuations. The behavior of the generator in dynamic situations is not entirely proportional to vehicle speed but depends on changes in exhaust heat. Comparing steady and dynamic results, it is found that the steady-state model overestimates output power but may underestimate conversion efficiency. The automobile thermoelectric generator is more suitable for vehicles with frequent speed changes to enhance dynamic output performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Shuai Zhang, Yuying Yan, Yingai Jin, Yang Gao
Summary: In this study, the energy storage performance of ceramic foam-enhanced molten salt in a shell-and-tube unit is investigated. The effects of ceramic foam configurations such as the filling height, porosity and outer diameter are studied. The results show that the enhancement performance is remarkable when the ceramic foam reaches the inner tube, while it is insignificant in the case of below the inner tube. The study suggests that ceramic foam can serve as a suitable thermal enhancer for molten salt in high-temperature solar thermal energy storage applications due to its corrosion resistance and cost advantage.
Article
Thermodynamics
Baoping Xu, Peihong Jiang, Zhuo Chen, Qiangang Li, Xi Wang, Yuying Yan
Summary: Intermittent heating is considered to be an effective way to save energy compared to continuous heating. However, the actual energy savings can vary greatly depending on building conditions, terminals, and heating supply systems. More research is needed on the energy savings resulting from intermittent heating for multi-zone buildings with heat pumps and specific terminals.
APPLIED THERMAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Zhiming Xu, Yu Zhao, Yuying Yan, Hao Zhang
Summary: This study investigates the corrosion inhibition properties of Sodium carboxymethyl cellulose (SCMC) on Fe, Cu, and Al using molecular dynamics simulations. The effects of the adsorption configuration, interaction energy of SCMC on different metal surfaces, and the degree of polymerization change of SCMC molecules were analyzed. The results show that SCMC has a strong interaction with metal surfaces and can still adsorb to the metal surface in a water environment, although the adsorption energy is reduced.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Thermodynamics
Ding Luo, Yuying Yan, Ying Li, Xuelin Yang, Hao Chen
Summary: The automobile thermoelectric generator is a promising technology for improving fuel economy. By optimizing the fin distance and thickness of the heat exchanger, significant improvements in performance are observed, with increases in power, efficiency, net power, and net efficiency compared to the generator without fin optimizations.
Article
Thermodynamics
Ding Luo, Ying Li, Yuying Yan, Xiaoming Hu, Xi'an Fan, Wei-Hsin Chen, Yong Ren, Bingyang Cao
Summary: This study aims to address the low conversion efficiency of thermoelectric modules by introducing a novel periodic heating method. Testing and modeling analysis showed that the periodic heating method greatly improved the average efficiency and ZTta value of the thermoelectric modules. Additionally, recommendations for optimizing parameters were provided to further enhance the dynamic behavior.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Wanchen Sun, Wenpeng Zeng, Liang Guo, Hao Zhang, Yuying Yan, Shaodian Lin, Genan Zhu, Mengqi Jiang, Changyou Yu, Fei Wu
Summary: Under the background of the carbon peak and carbon neutrality, the development and utilization of zero-carbon fuels, such as green ammonia and green hydrogen, have gained attention. The transportation and storage issues of hydrogen limit its industrial development, while ammonia has advantages as a hydrogen energy carrier for power systems. A study on the combustion and flame development of the ammonia-diesel dual-fuel engine was conducted, and the results showed that ammonia combustion has lower heat release and lower indicated mean effective pressure compared to pure diesel combustion. The flame characteristics of the ammonia-diesel dual-fuel combustion mode differed from the pure diesel combustion mode.
Article
Thermodynamics
Ding Luo, Yuying Yan, Wei-Hsin Chen, Xuelin Yang, Hao Chen, Bingyang Cao, Yulong Zhao
Summary: This paper proposes a comprehensive hybrid transient CFD-thermal resistance model for predicting the dynamic behavior of an automobile thermoelectric generator (ATEG) system. The model considers temperature dependencies, topological connections of thermoelectric modules, and dynamic characteristics, providing high accuracy and short computational time. The dynamic behavior of the ATEG system is analyzed using transient exhaust heat as the heat source input. The model results show that the dynamic output power of the ATEG system follows the same variation trend as the exhaust temperature, but with more stability. The model is experimentally validated, yielding mean deviations of 7.70% for output voltage and 1.12% for outlet air temperature. It serves as a convenient tool for evaluating the behavior of ATEG systems under different topological connections and assessing their dynamic performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Green & Sustainable Science & Technology
Shuai Zhang, Yuying Yan
Summary: Latent heat thermal energy storage improves the utilization efficiency of renewable energy. Stones are used as both sensible heat storage media and thermal enhancer of phase change materials, which are widely accessible, low-cost and environmentally friendly. This method eliminates the need for additional material preparation and processing, making it more cost-effective and environmentally friendly.
Article
Thermodynamics
Zeyu Liu, Yuying Yan
Summary: This study experimentally investigates the formation of deposition patterns during the evaporation of magnetic nanofluid droplets at different substrate temperatures. The experimental results show that as the temperature increases, the droplet evaporation exhibits uniform patterns, typical 'coffee ring' patterns, and dual ring patterns. The study also reveals the crucial role of Marangoni flow in the formation of secondary ring patterns.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
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.
