Article
Energy & Fuels
Junting Wu, Qicheng Chen, Yingjin Zhang, Kanglong Sun
Summary: This study explored the comprehensive effect of the position and length of a single fin in a latent heat thermal energy storage unit on the melting and solidification of phase-change materials through transient numerical simulations. It was found that increasing the fin length and lowering the fin position simultaneously significantly reduced the total melting time, but resulted in non-uniform temperature distribution during the solidification process. An optimal fin position corresponding to different fin lengths was suggested. Additionally, the disparity between heat storage/release and phase transition was quantitatively discussed.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
Yang Tian, Xianglei Liu, Qiao Xu, Qingyang Luo, Hangbin Zheng, Chao Song, Zhonghui Zhu, Ke Gao, Chunzhuo Dang, Haolei Wang, Yimin Xuan
Summary: A bionic topology optimization method is proposed to enhance thermal storage/release performances, leading to significantly reduced melting and solidification time. The similarity between the fractal dimension of optimized fins and leaf structure contributes to better synergy between flow and heat transfer. These findings provide a new approach for the design of high performance LHS devices.
APPLIED THERMAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Yongping Huang, Feng Yao, Xiangdong Liu
Summary: This study introduces an innovative hierarchical fin to enhance the charging performance of horizontal LHS units, which significantly improves the charging rate and temperature uniformity according to numerical modeling. Compared to conventional fins, the hierarchical fin greatly enhances heat conduction performance in the late melting stage, leading to a maximum reduction of 41.1% in the whole melting time of horizontal LHS units.
Article
Energy & Fuels
Wei Li, Yuli Zhang, Xu Zhang, Jun Zhao
Summary: This paper explores the use of multiple phase change materials to improve the performance of heat storage systems. The research involves the design of a heat storage device with multiple PCMs and the introduction of two parameters, latent heat utilization and heat transfer effectiveness, to evaluate its performance. The study finds that the inlet velocity and temperature of the heat transfer fluid have a significant impact on latent heat utilization, while increasing the thermal conductivity of PCM can greatly improve it. Additionally, multiple PCMs with a suitable melting temperature difference can enhance both latent heat utilization and heat transfer effectiveness.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Xianglei Liu, Xinliang Qin, Yang Tian, Qingyang Luo, Haichen Yao, Jianguo Wang, Chunzhuo Dang, Qiao Xu, Shushan Lv, Yimin Xuan
Summary: Biomimetic topology-optimized annular fins were proposed to accelerate heat storage performance in Latent heat thermal energy storage (LHTES) technology. The optimized fins reduced melting time by 45.9% compared to traditional fins, outperforming pitch-varying fins and diameter-varying fins by 18.4% and 23.5% respectively. Furthermore, biomimetic fins greatly improved temperature uniformity in phase change materials (PCMs) with a reduction of average temperature difference by 75.3%. The fractal dimension of optimized fins resembled leaf vein structures, showcasing the effectiveness of biomimetics in LHTES.
Article
Thermodynamics
Qixuan Zhong, Parthiv K. Chandra, Wei Li, Liang Gao, Akhil Garg, Song Lv, K. Tai
Summary: This article focuses on the problem of fluctuating cooling system flow caused by different working states during the operation of electric vehicles. The authors propose a two-dimensional topology optimization method for obtaining cooling plates with different topological structures. The results indicate that the optimized cooling plate structure under low flow conditions has better heat dissipation performance.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Menglong Bian
Summary: The study analyzed the heat transfer characteristics of a Chinese kang using ANSYS, revealing non-uniform temperature distribution and clear distribution characteristics of thermal damage severity in different areas. The kang body has slow temperature changes, with a certain thermal inertia, showing a continued rise in temperature even after heating is stopped.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Gabriele Humbert, Adriano Sciacovelli
Summary: In this study, mass transfer enhancement in open system thermochemical energy storage is achieved through optimized design of flow channel geometries. Two reactor configurations, sieve reactors and cylindrical reactors, are analyzed and compared with literature benchmarks. Tentacular flow channel geometries are observed, with elongated flow channels in the reactive bed without direct connection between the inlet and outlet interfaces. Compared to literature solutions, a +757.8% increase in discharged energy is achieved in a fixed time. Optimal geometrical features vary based on the targeted performance metric. Thinner channels are found to be favorable for increasing discharged exergy. Overall, the emerging design trends provide new pathways for improving open system thermochemical energy storage reactors and contribute significantly to technological advancement.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Mohamed El Habib Amagour, Mounir Bennajah, Adil Rachek
Summary: This study presents a numerical investigation of heat transfer performance inside a compact finned-tube heat exchanger used in latent heat storage. The results show that adjusting operational and design parameters can significantly impact the charging and discharging performance.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Energy & Fuels
B. Peremans, M. Blommaert, M. Baelmans
Summary: In this study, optimal designs for rectangular Phase Change Material (PCM) modules charged by a water flow were obtained using topology optimization. The optimal topologies are designed to achieve maximum mean charging power of the PCM. Tree-like metal structures with increased branching were found to be more effective than straight fins in conduction driven phase-change problems.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
R. Siddharth, Shaik Subhani, Rajendran Senthil Kumar
Summary: The study investigates the flow and heat transfer characteristics of two hot circular bodies in a 2D simulation. By optimizing the geometry, maximum heat dissipation can be achieved. The positioning of the cylinders in the enclosure has a significant impact on heat transfer rate.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Changda Nie, Shengxiang Deng, Jiangwei Liu, Yunxiao Li
Summary: The study proposed the combination of full-fins and nanoparticles in gradient-concentration to improve the performance of latent heat storage systems using phase change materials. Experimental results demonstrate that the design of full-fins reduces melting time during the melting process, and when combined with multi-walled carbon nanotubes, it enhances melting uniformity and further shortens the complete melting time.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Lyudmila Knysh
Summary: Thermodynamic analysis and flow rate optimization were performed to study the long double-tube latent heat thermal energy storage systems. Computer modeling based on a 3D non-steady non-linear coupled thermo-fluid mathematical model was used to simulate the system. The model was verified through experimental data. It was found that laminar flow of the heat transfer fluid ensures uniform temperature in the phase change material, and the optimal flow rate ranges were determined based on the correlation between Nusselt numbers and Reynolds numbers.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Shuhao Wu, Yongcun Zhang, Shutian Liu
Summary: The overall heat transfer efficiency of transient heat conduction structures can be maximized by minimizing heat compliance. However, in some cases, a new performance index called Transient Thermal Dissipation Efficiency (TTDE) is proposed to better describe the overall heat transfer efficiency. The TTDE-based model shows optimized designs with higher heat transfer efficiency compared to THC-based model, indicating that TTDE is a better objective for topology optimization in such cases.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Energy & Fuels
Debasree Ghosh, Joyjeet Ghose, Pulak Datta, Pallavi Kumari, Suraj Paul
Summary: The use of phase change materials (PCMs) is crucial for energy storage and meeting basic needs. Improving the thermal properties of PCMs through additives and encapsulation can enhance their storage capacity. Encapsulated PCMs and PCM composites have shown superior performance in latent heat thermal energy storage.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Y. Zhao, C. Y. Zhao, Z. G. Xu, H. J. Xu
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2016)
Article
Computer Science, Interdisciplinary Applications
Y. Zhao, C. Y. Zhao, Z. G. Xu
COMPUTERS & FLUIDS
(2018)
Article
Thermodynamics
Y. Zhao, Y. You, H. B. Liu, C. Y. Zhao, Z. G. Xu
Article
Energy & Fuels
Y. Zhao, H. B. Liu, C. Y. Zhao
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2019)
Review
Energy & Fuels
Y. Zhao, C. Y. Zhao, C. N. Markides, H. Wang, W. Li
Article
Green & Sustainable Science & Technology
Y. Q. Ge, Y. Zhao, C. Y. Zhao
Summary: This paper investigates the thermodynamic feasibility of using packed-bed latent heat/cold stores instead of packed-bed sensible heat/cold stores in pumped thermal electricity storage systems. The results show an increase in energy storage density, a power density of 216.5 kW/m^3, and a round-trip efficiency of 84.7%, making the system competitive in large-scale electricity storage technologies.
Article
Multidisciplinary Sciences
Yin You, Yao Zhao, Changying Zhao, Hongbing Liu
CHINESE SCIENCE BULLETIN-CHINESE
(2019)
Article
Thermodynamics
Yunxia Ma, Fei Liu, Honggang Pan, Hongjian Zhang, Shuxia Yan, Ailing Zhang
Summary: This paper proposes a dynamically tunable and switchable perfect infrared absorber that exhibits excellent electrical regulation performance and high absorptance. The absorption mechanism is explained using a multiple interference model, and it is proven to be polarization insensitive.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
F. J. dos Santos, G. S. M. Martins, M. Strobel, L. Beckedorff, K. V. de Paiva, J. L. G. Oliveira
Summary: This study investigates the effects of inlet conditions and plate's features on the thermal-flow performance of a gasket plate heat exchanger (GPHE) and assesses the impact of a modified tightening distance on its performance. No systematic study on the combined effects of inlet conditions and assembly accuracy on GPHE performance has been conducted before.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Alok K. Ray, Dibakar Rakshit, K. Ravi Kumar, Hal Gurgenci
Summary: The low thermal conductivity of phase change materials limits the heat transfer rate and application of latent heat storage systems. This numerical study examines the impact of two passive heat transfer enhancement techniques on the thermal performance of a latent heat storage system. The results show that the orientation and position of the heat transfer fluid tube have significant effects on the charging duration, while the discharging duration remains unchanged. The combined effect of orientation and eccentricity reduces the charging duration, but increases the discharging duration compared to the concentric domain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yalu Han, Yanlong Wang, Chenyang Liu, Xinmin Hu, Yin An, Zhengcai Li, Jiaxun Jiang, Lizhi Du
Summary: This paper investigates the calculation method of thermal conductivity in NAPLs-contaminated soils. By establishing NAPLs-contaminated soil models and using the Lattice Boltzmann Method (LBM) for calculation, an optimized three-dimensional model with high computational accuracy and efficiency is obtained. The study also finds that saturation and Nz parameters have a significant impact on calculation time, while the thermal conductivity of the two-dimensional model is more sensitive to anisotropy. The influence of porosity and NAPLs content on thermal conductivity should be considered during in-situ thermal desorption.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Mostafa Taha, Song Zhao, Aymeric Lamorlette, Jean-Louis Consalvi, Pierre Boivin
Summary: For the first time, large-eddy simulations (LES) of the near-field region of large-scale fire plumes were performed using a pressure-based Lattice Boltzmann method (LBM) with low-Mach number approximation. The simulations showed quantitative agreement with experimental data and were consistent with previously-published numerical studies. The study demonstrated the computational efficiency of the proposed LBM solver in tackling fire-induced flows, suggesting LBMs as a good alternative candidate for modeling fire-related problems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weixin Zhang, Yehang Xie, Yuqiang Ding, Zhao Liu, Zhenping Feng
Summary: This study investigated the impact of upstream slot leakage on the endwall film cooling characteristics of turbine blades. Pressure Sensitive Paint (PSP) technology was used to measure the film cooling characteristics, and numerical analysis was conducted to evaluate the aerodynamic performance. It was found that increasing the mass flow ratio of the upstream slot enhanced film cooling, decreased aerodynamic losses, and reduced the strength of passage vortex. However, reducing the distance between the slot and the blade leading edge only enhanced film cooling without affecting the leakage coverage area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rui Zhang, Zhen-lei Li, Yan-sheng Zhang, Dong Chen, Guo Yuan
Summary: This study discusses the heat transfer behavior of different jet forms on steel tubes. The results show that the annular jet performs better in terms of cooling intensity and uniformity. The cooling performances of the two jet forms are similar when the steel tube size is small. Therefore, the planar jet can be considered for smaller diameters due to its simplicity, low cost, and convenience in application.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
A. R. Khoei, A. M. Orvati Movaffagh, A. Rezaei Sameti
Summary: This paper presents a comprehensive study on the thermo-mechanical characteristics of oxide-coated aluminum nano-powder. It is found that the thermal conductivity of oxide-coated aluminum nano-powder is significantly lower than that of the bulk aluminum, and it is affected by the density and temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yanjin Wang, Jintao Xiong, Lingyu Chen, Zhihai Lv, Qian Wang
Summary: A solar radiation transfer model for spray cooling double skin facade (SC-DSF) is proposed in this study. The model is validated by experimental results and various influence factors are analyzed. The effectiveness of adjusting droplet coverage rate and size is also evaluated.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Bostjan Zajec, Blaz Mikuz, Anil Kumar Basavaraj, Marko Matkovic, Matej Tekavcic, Martin Draksler, Leon Cizelj, Bostjan Koncar
Summary: We have developed an advanced experimental setup to investigate flow and heat transfer in an annular channel. The setup allows heat transfer measurements and flow visualization using a temperature-controlled inner tube. Measurements can be conducted in both single-phase and two-phase flow regimes. The setup ensures a uniform velocity field in the annular channel using specially designed inlet and outlet headers. The inner copper tube is heated by water and contains turbulators for enhanced heat transfer and thermocouples for temperature measurement. A three-dimensional conjugate heat transfer CFD model has been developed and validated to accurately estimate heat losses in the setup. This study demonstrates the importance of numerical simulations in improving the interpretation of complex experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weijie Chen, Ke Wang, Yongqing Wang, Shantung Tu, Zunchao Liu, Huijuan Su
Summary: In this study, a novel gradient porosity transpiration cooling plate structure (GP-TCPS) is proposed to alleviate heat transfer deterioration caused by non-uniform temperature distribution in transpiration cooling plate structure (TCPS). Computational fluid dynamics (CFD) and response surface method (RSM) were used for qualitative and quantitative analysis of the flow and heat transfer of GP-TCPS. The optimized structure of GP-TCPS significantly improves temperature uniformity, injection pressure, and average cooling efficiency compared to traditional TCPS.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
R. Essam, A. Elsaid, W. K. Zahra
Summary: This study presents a novel bioheat model for simulating heat transfer in skin tissue. The model offers an improved representation of thermal dynamics in the skin and has been validated using numerical solutions and experimental measurements. The study highlights the importance of incorporating vascular inlet parameters and thermal relaxation effects in the thermal profile, and suggests potential applications in thermal therapy and wound healing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Dongbo Shi, Tao Xu, Zifeng Chen, Di Zhang, Yonghui Xie
Summary: The cooling structure design of turbine blades is crucial for the safety and reliability of the gas turbine set. This research investigates different arrangement schemes, including dimple/protrusion arrangements, to enhance the cooling performance. The results show that the arrangement scheme with both passes arranged by dimples has the best comprehensive thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Emrehan Guersoy, Hayati Kadir Pazarlioglu, Mehmet Guerdal, Engin Gedik, Kamil Arslan
Summary: The thermo-hydraulic performance of Al2O3/H2O nanofluid with different nanoparticle shapes flowing in a sudden expansion tube with variable sudden expansion inclination angles and elliptical dimpled fins with different diameters were numerically investigated. The results showed that the nanoparticle shapes, sudden expansion inclination angles, and elliptical dimpled fin have significant impact on the thermo-hydraulic performance. This study reveals the novelty and importance of these factors in the research.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rukun Hu, Xinyu Huang, Xinyu Gao, Liu Lu, Xiaohu Yang, Bengt Sund
Summary: This study examines the impact of applying bottom cross-cut on PCM's spatial distribution in a horizontal LHTES unit using numerical simulation. The findings show that bottom cross-cut can improve the heat storage rate and natural convection heat transfer gain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)