Article
Thermodynamics
Wenzhu Lin, Ziye Ling, Xiaoming Fang, Zhengguo Zhang
Summary: The thermal performance of a novel spiral-tube heat exchanger latent heat thermal energy storage unit was investigated experimentally and numerically. Results showed an average power higher than 2 kW during the discharging process, and the heat transfer coefficient and area varied with flow rate. A numerical model validated phase change behavior, demonstrating the unit's compact structure and high heat transfer area.
APPLIED THERMAL ENGINEERING
(2021)
Article
Construction & Building Technology
Quanquan Luo, Baoguo Li, Zhen Wang, Shuqiang Su, Honghai Xiao
Summary: Research shows that improving the design and using phase-change materials can effectively enhance the thermal efficiency of solar air heaters, reduce heat loss rate, extend operating hours, and decrease CO2 emissions.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Energy & Fuels
Alok Kumar, Rohit Agrawal
Summary: The study investigates experimental results of a PCM-based helical coil heat exchanger, showing the charging and discharging time of PCM at different flow rates, as well as a comparison with a regular helical coil heat exchanger. The research also highlights the varying instantaneous effectiveness of the thermal storage unit at different flow rates.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Li-E Yan, Nidal H. Abu-Hamdeh, Rashad A. R. Bantan, Mahmoud M. Selim
Summary: Spiral pipes with hot hybrid nanomaterials were used to improve the heat storage capacity of paraffin, with the effects of Reynolds numbers on charging rates examined. Results showed that Reynolds numbers had varying impacts on heat storage capacity at different time intervals.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
Pallavi Kumari, Debasree Ghosh
Summary: The use of latent heat energy storage can minimize fuel consumption and reduce environmental pollution. This study aims to provide more information on designing latent heat energy storage systems for industrial and domestic applications. The study compares the storage or melting efficiency of phase-change materials in concentric and hairpin heat exchangers, and investigates the effect of PCM type on the melting process. Numerical results show that decreasing the diameter and increasing the length of the high-temperature fluid can enhance heat transfer and improve energy storage.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Energy & Fuels
Farhad Afsharpanah, Khashayar Pakzad, Seyed Soheil Mousavi Ajarostaghi, Sebastien Poncet, Kurosh Sedighi
Summary: Frequent power outages in developing countries lead to food spoilage, where ice storage systems can serve as backup cooling sources. Geometrical optimization of parameters such as helical pitch length can significantly improve the charging rate of ice storage units. The modified Stefan number of refrigerant flow has a considerable impact on the charging rate, while natural convection does not have a noticeable effect on ice formation.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Energy & Fuels
P. Das, S. P. Kar, R. K. Sarangi
Summary: This article presents a detailed investigation into the use of different Phase Change Materials (PCM) in Thermal Energy Storage (TES) devices, specifically heat exchangers. The performance of different heat exchanger designs using various PCMs is analyzed, highlighting the differences in geometry and performance. The study also discusses the importance of different performance enhancement methods and parameters in improving heat transfer. A novel heat exchanger design using PCM is introduced as an efficient TES unit, and quantitative analysis of melting, solidification, charging, and discharging times is reviewed.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Yuchen Tian, Mingjie Zheng, Donghao Fan, Yanan Zhang, Jun Zhao, Guang Jin, Wenfei Wu, Erdem Cuce, Shaopeng Guo
Summary: This paper conducted a numerical simulation on the discharging process of heat transfer fluid at different temperatures and flow rates. The results showed that the novel unit has superior heat transfer performance compared to the conventional unit, but the counterflow may cause small droplets to overflow.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Nicola Bianco, Andrea Fragnito, Marcello Iasiello, Gerardo Maria Mauro
Summary: This study applies multi-objective optimization based on a genetic algorithm to design a wall-type heat recovery and ventilation (HRV) unit equipped with a phase change material (PCM) to demonstrate its advantages in buildings. A thermo-fluid dynamic 3D model is developed to assess natural convection. Then, a 2D model is solved and validated using a commercial finite element code.
Article
Thermodynamics
Qinggong Liu, Yao Tao, Long Shi, Yi Huang, Yuanling Peng, Yong Wang, Jiyuan Tu
Summary: This study aims to improve the heat transfer performance of the ground heat exchanger (GHE) through the synergistic effects of structure and material. The results showed that the heat transfer amount increased by 69.9% and the thermal resistance decreased by 81.77% under the synergistic effects of shape-stabilized phase change material (SSPCM) and CuO/water nanofluid. SSPCM backfilling resulted in a ground thermal influence radius that was about 80% of that with sand backfill. Nanofluid and SSPCM promoted and reinforced each other, with a more significant performance improvement effect under the synergistic effects of SSPCM and nanofluid.
Article
Materials Science, Ceramics
Zhiyuan Wang, Ke Lei, Shuo Wang, Fu Wang, Yuanqiang Zhang, Deqiu Zou
Summary: High-performance heat storage materials and devices are in urgent demand to achieve efficient heat storage. In this study, a novel SnBi58 alloy microencapsulated phase change material (MEPCM)/ceramic composite with flow channels inside was fabricated for medium-temperature heat storage, combining the characteristics of sensible heat storage (SHS) and latent heat storage (LHS). A tubeless heat exchanger based on the composite was constructed and experimentally studied for its heat storage performance. The results show that the composite-based heat exchanger has doubled thermal conductivity (up to 3.09 W/(m.K)) and increased heat storage density by 30.4% to 559.1 MJ/m(3) compared to a ceramic-based heat exchanger.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
Digant S. Mehta, Bhavesh Vaghela, Manish K. Rathod, Jyotirmay Banerjee
Summary: The experimental analysis on the heat transfer enhancement in concentric tube type Latent Heat Storage Unit (LHSU) using spiral fins revealed that the provision of fins expedited the melting rate and reduced the time required for energy storage. The maximum reduction in charging time of 51.61% was observed with vertical orientation, while inclined and horizontal orientations offered reductions of 40.97% and 34.1% respectively. Integration of spiral fins may enable the application of LHSU to large scale solar thermal applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Review
Energy & Fuels
Biao Liu, Xuelai Zhang, Jun Ji
Summary: This article reviews the design and applications of solar phase-change energy storage systems in residential buildings. Integrating phase-change materials (PCMs) into solar thermal collector systems can improve efficiency but may face PCM leakage issues. Adjusting inclination angle and selecting PCM in appropriate temperature zones can enhance system efficiency, while considerations for separated systems include heat exchanger types, structures, and solar collector types.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Giulia Righetti, Claudio Zilio, Giovanni A. Longo, Kamel Hooman, Simone Mancin
Summary: Experimental study showed that the addition of foam can significantly reduce the charging and discharging times of phase change materials. The foam sample with 20 pores per inch demonstrated the best performance and fastest phase transfers. Furthermore, the charging and discharging times were influenced by water flow rate and temperature, but not affected by the inclination angle.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Ming-Hsuan Hu, Tianhao Xu, Justin NW. Chiu
Summary: This study compares the performance of two primary LHTES packing methods, encapsulation and bulk PCM storage, and evaluates the impact of heat transfer fluid flowrate on energy storage performance. The results show that the time-varying flowrate control can provide the required power, and partial charging/discharging exhibits higher mean thermal power than full charge/discharge. Additionally, the slab-encapsulated PCM storage unit has a shorter completion time, while the SCHE based unit has a higher energy storage density.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Industrial
Wenxin Li, Ness Shroff
Summary: In a stable multi-server system, different machines with varying speeds can achieve asymptotic optimality for minimizing total completion time by using work-conserving disciplines, assuming job size and interarrival time distributions have finite moments. Additionally, the paper provides a tight upper bound on the competitive ratios of work-conserving disciplines for minimizing flow time.
Article
Construction & Building Technology
Wenxin Li, Takamasa Hasama, Adrian Chong, Joo Guan Hang, Bertrand Lasternas, Khee Poh Lam, Kwok Wai Tham
Summary: Ceiling fans have been found to effectively reduce the transmission of droplets and aerosols during coughing by diluting the concentration of particles in the air. They can change the airflow pattern and provide better protection against cough exposure.
BUILDING AND ENVIRONMENT
(2023)
Article
Engineering, Electrical & Electronic
Yifu Wang, Wenxin Li, Dong Zhou, Weizong Xu, Fangfang Ren, Dunjun Chen, Rong Zhang, Youdou Zheng, Hai Lu
Summary: This study focuses on a 4H-SiC n-p-n bipolar phototransistor detector (PTD) with a floating-base configuration that exhibits low dark current and high responsivity in the UV wavelength band. The PTD has a large photo to-dark current ratio and high-temperature operation potential. The optical gain is strongly influenced by incident light intensity and junction capacitance, and the PTD shows a reasonable linear response to incident UV power density when operated in active mode.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Automation & Control Systems
Ruiqi Chen, Wenxin Li, Hongbing Yang
Summary: In this article, a novel deep reinforcement learning framework is proposed for solving the classical job-shop scheduling problem. This method utilizes the attention mechanism and disjunctive graph embedding to model the problem and an improved transformer architecture to generate solutions. Experimental results confirmed the effectiveness of this approach.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2023)
Article
Chemistry, Multidisciplinary
Chao Liang, Naping Xiong, Mengfan Liu, Yue Chen, Wenxin Li, Jiankun Xu, Yin Sun, Yongjie Wang, Yang Dong, Wenpei Fan, Yifeng Zhang, Zhichang Zhang
Summary: Current immunotherapy falls short of expectations in treating osteosarcoma. Macrophages, as the most abundant immune cells in the tumor microenvironment, play a critical role in the progression of osteosarcoma. Bivalent manganese ions (Mn2+) have shown potential in immunotherapy for natural killer cells and dendritic cells, but their effects on macrophage polarization, particularly in the tumor microenvironment, remain unclear.
Article
Energy & Fuels
Wenxin Li, Xiaowen Ruan, Zhong Wei, Shuang Lian, Xiaoqiang Cui, Jiku Wang
Summary: Semiconductor photocatalysis with the Z-scheme mechanism is a promising approach to enhance photocatalytic performance. In this study, a novel Z-scheme I-BiOBr/C3N4 heterostructure is successfully synthesized, exhibiting superior photocatalytic degradation performance of various organic pollutants. The optimized catalyst also shows an enhanced photocatalytic hydrogen evolution rate. The widened visible light absorption range and efficient carriers' transportation contribute to the enhanced photocatalytic performance.
Article
Multidisciplinary Sciences
Shuhei Aramaki, Shogo Tsuge, Ariful Islam, Fumihiro Eto, Takumi Sakamoto, Soho Oyama, Wenxin Li, Chi Zhang, Shinichi Yamaguchi, Daiki Takatsuka, Yuko Hosokawa, A. S. M. Waliullah, Yutaka Takahashi, Kenji Kikushima, Tomohito Sato, Kei Koizumi, Hiroyuki Ogura, Tomoaki Kahyo, Satoshi Baba, Norihiko Shiiya, Haruhiko Sugimura, Katsumasa Nakamura, Mitsutoshi Setou
Summary: Cancer tissues possess more pathological characteristics than cancer cells, making the evaluation of cancer tissues essential in determining cancer treatment strategies. Mass spectrometry imaging (MSI) provides the ability to assess cancer tissues and identify molecules while preserving spatial information. Cluster analysis of cancer tissues' MSI data has been used to evaluate phenotype heterogeneity, which may not always coincide with genotype heterogeneity. In this study, we explored the phenotype heterogeneity of luminal breast cancer, known to have fewer gene mutations, and successfully identified phenotype heterogeneity based on lipidomics in the tissue samples.
Article
Engineering, Manufacturing
Honghao Chen, Youping Gong, Junlin He, Zizhou Qiao, Bo Hong, Wenxin Li, Chuanping Zhou, Rougang Zhou, Huifeng Shao
Summary: The main objective of this study was to prepare sodium alginate-xanthan gum-hydroxyapatite (SA-XG-HA) porous cartilage scaffolds that can naturally degrade in the human body and be used to promote cartilage damage repair by 3D printing technology. The optimal ratio of SA and XG was determined, and a mathematical model of the hybrid slurry was established. Suitable printing parameters were determined through finite element simulation and actual printing process. The resulting composite scaffolds had good mechanical and biological properties.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Electrical & Electronic
Wenxin Li, Yifu Wang, Guangyang Gu, Fangfang Ren, Dong Zhou, Weizong Xu, Dunjun Chen, Rong Zhang, Youdou Zheng, Hai Lu
Summary: A high-performance metal-semiconductor-metal solar-blind ultraviolet photodetector (UV PD) based on AlGaN heterostructure (AlGaNH) was fabricated. By utilizing the built-in polarization effect, a highly conductive two-dimensional electron gas channel was induced at the Al0.65Ga0.35N/Al0.4Ga0.6N heterointerface. The AlGaNH PD exhibited a high peak responsivity of 3.42 A/W at 270 nm, which is considerably higher than that of the control AlGaN PD without polarization enhancement. This work provides a viable approach to enhance the detection performance of AlGaN-based solar-blind PDs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Construction & Building Technology
Yanru Li, Kwok Wei Shah, Wenxin Li, Teng Xiong
Summary: This study analyzes the thermal performance improvement of a gray tintable electrochromic window under Singapore's tropical climate. Two climate chambers were studied, one with a double-glazed EC window and another with a single-glazing window as the reference. The results showed that the EC window could achieve a reduction in interior surface temperature and improvement in Predicted Mean Vote (PMV) when compared to the reference window. The EC window under the fully tinted state also achieved energy savings compared to the reference window. Using EC windows in Singapore's tropical climate can improve occupant comfort and reduce air conditioning energy consumption.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Civil
Yanxu Guo, Qingsong Zhang, Hongbo Wang, Rentai Liu, Xin Chen, Wenxin Li, Lihai Zhang
Summary: Due to the complexity of broken rock mass structure with discontinuity and anisotropy, grouting reinforcement is generally necessary in underground construction. This study experimentally investigates the mechanical properties of grouted broken rock mass, considering characteristics such as degree of fragmentation and shape, as well as reinforcement methods such as relative strength ratio and volumetric block proportion. The results show that strength and deformation of the reinforced rock mass depend on relative strength ratio and volumetric block proportion. Additionally, the shape of the rock mass has a significant influence on compressive strength enhancement, especially under high strength ratios.
GEOMECHANICS AND ENGINEERING
(2023)
Proceedings Paper
Computer Science, Software Engineering
Rui Zhu, Wenxin Li, Canchang Jin
Summary: A novel pipeline called TAG is proposed for automatically generating UML activity diagrams based on deep learning. TAG is inspired by the fact that semantic roles in texts can be obtained via sequence labeling, and a business process document corresponds to a semantic role sequence. By using a graph neural network and multi-layer semantic fusion, the temporal activity relationship in a business process document can be predicted, and UML activity diagrams can be generated automatically. The experimental results achieved a temporal activity relationship prediction accuracy rate of 79.87%.
2023 IEEE INTERNATIONAL CONFERENCE ON SOFTWARE ANALYSIS, EVOLUTION AND REENGINEERING, SANER
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Ya Li, Qinglin Zhou, Shichuan Ding, Hang Jun, Wei Li
Summary: This paper investigates the influences of rotor design on air-gap field modulation theory in spoke-type permanent magnet machines for traction applications. The findings reveal that, besides the main-order working harmonic, abundant modulated air-gap field harmonics also contribute significantly to the torque in spoke-type permanent magnet machines. Additionally, the rotor open-slotting and permanent magnet arrangement designs have a noticeable effect on air-gap field modulation effects.
2022 25TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS 2022)
(2022)
Article
Engineering, Multidisciplinary
Fan Chen, Jianxing Fan, Wei Li, Jie Fang, Shichuan Ding
Summary: This paper presents a method to minimize the copper loss caused by high-resistance connection in surface mounted permanent magnet synchronous machine drive system. By deriving the model and selecting the optimal voltage vector under fault conditions, and implementing the model predictive current control strategy, the copper loss is effectively reduced.
RESULTS IN ENGINEERING
(2022)
Article
Environmental Sciences
Wenxin Li
Summary: In this study, a composite lithology water drive experiment platform was used to simulate the development process of low-permeability oil reservoirs. The internal pressure change characteristics of the reservoir under different injection-production ratios were analyzed, and the effects of artificial fractures on water absorption capacity were compared. The experimental results showed that a larger injection multiple is required for composite lithology models with artificial fractures to establish an effective driving system, and the presence of fractures reduced the reservoir's water storage capacity and relative water absorption amount.
FRESENIUS ENVIRONMENTAL BULLETIN
(2022)
