Case Studies in Thermal Engineering最新文献_第2页

Performance evaluation of plate heat exchangers with chevron-type corrugation pattern for the superfluid helium cryogenic system 超流氦低温系统中波纹型板式换热器的性能评价

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-17 DOI: 10.1016/j.csite.2025.106359

Liming Zhu , Dajun Fan , Peng Zhang , Jun Wen , Yongping Hu , Xianjin Wang , Yugang Zhao , Yuxuan Wang , Junhui Zhang , Xiaofei Niu

{"title":"Performance evaluation of plate heat exchangers with chevron-type corrugation pattern for the superfluid helium cryogenic system","authors":"Liming Zhu , Dajun Fan , Peng Zhang , Jun Wen , Yongping Hu , Xianjin Wang , Yugang Zhao , Yuxuan Wang , Junhui Zhang , Xiaofei Niu","doi":"10.1016/j.csite.2025.106359","DOIUrl":"10.1016/j.csite.2025.106359","url":null,"abstract":"<div><div>The 2 K heat exchanger is a critical component of the superfluid helium cryogenic system. In this paper, to further reduce the volume and manufacturing cost, a plate heat exchanger (PHE) with herringbone corrugation was innovatively used as a 2 K heat exchanger. The CFD numerical method was used to simulate the single flow channel of the PHE with chevron-type corrugation pattern. It got correlations of Colburn factor <em>j</em>, Fanning friction factor <em>f</em> with Reynolds number in the core part and empirical correlations of pressure drop in the fluid distribution parts. A PHE prototype was designed based on the distributed parameter differential method and correlations. Meanwhile, the 2 K cryogenic test was carried out on the PHE prototype using supercritical helium and liquid helium respectively. The results show that the calculated values are in good agreement with experimental ones. The PHE design method is simple and accurate based on distributed parameter method and CFD in this study. And brazed PHEs can be used in the liquid helium temperature range.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106359"},"PeriodicalIF":6.4,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Organophosphonic acid intercalation and surface-functionalized hydrotalcite-based flame retardant materials for epoxy resins with highly effective smoke suppression and fire safety 有机膦酸插层和表面功能化水滑石基环氧树脂阻燃材料，具有高效抑烟和防火性能

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-17 DOI: 10.1016/j.csite.2025.106361

Yuting Ao , Lulu Xu , Hanjun Wu , Qingrong Cheng , Hong Zhou , Zhiquan Pan

{"title":"Organophosphonic acid intercalation and surface-functionalized hydrotalcite-based flame retardant materials for epoxy resins with highly effective smoke suppression and fire safety","authors":"Yuting Ao , Lulu Xu , Hanjun Wu , Qingrong Cheng , Hong Zhou , Zhiquan Pan","doi":"10.1016/j.csite.2025.106361","DOIUrl":"10.1016/j.csite.2025.106361","url":null,"abstract":"<div><div>In this work, the green and efficient organic-inorganic hybrid flame retardant materials (PA-Si-PPO-LDHs) were prepared by introducing phenyl phosphoric acid (PPO) and phytic acid (PA) between layers and surface of hydrotalcites, and characterized. With the addition of 10 wt% PA-Si-PPO-LDHs, the EP composites achieved UL-94 V-1 rating and a limiting oxygen index of 30.0 %, and obtained 46.4 %, 37.0 % and 20.1 % reduction in heat release rate, CO production and total smoke production, respectively. In addition, the PA-Si-PPO-LDHs were better dispersed in EP, and the tensile, three-point bending and simple beam impact strengths of EP composites were improved in comparison with the pure EP. The prepared PA-Si-PPO-LDHs contributed to improve the flame retardant of EP composites by the formation of the dense char layer in the condensed phase, dilution of flammable gases and the released phosphorus-containing free radicals for capture of the H• and HO• free radicals in the gas phase. Co and Ni metal-catalyzed CO conversion of CO<sub>2</sub> reduced the release of heat and hazardous gases, and improve the fire safety of EP composites. The present work provided a simple method for the preparation of green and efficient LDHs-based organic-inorganic hybrid flame retardants for improving the fire safety of epoxy composites.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106361"},"PeriodicalIF":6.4,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal analysis for high mountain aquaculture outdoor pools within the nexus of food, water and energy 高山水产养殖室外水池在食物、水和能量关系下的热分析

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-17 DOI: 10.1016/j.csite.2025.106319

Elias M. Salilih, Walter D. Leon-Salas, Luis Gerardo Ruiz Gonzalez, Pedro Flores Larico, Miguel Vizcardo Cornejo, Mauricio Postigo-Málaga, Miguel Ocharán Pichu, Juan Manuel Jara Gonzales

{"title":"Thermal analysis for high mountain aquaculture outdoor pools within the nexus of food, water and energy","authors":"Elias M. Salilih, Walter D. Leon-Salas, Luis Gerardo Ruiz Gonzalez, Pedro Flores Larico, Miguel Vizcardo Cornejo, Mauricio Postigo-Málaga, Miguel Ocharán Pichu, Juan Manuel Jara Gonzales","doi":"10.1016/j.csite.2025.106319","DOIUrl":"https://doi.org/10.1016/j.csite.2025.106319","url":null,"abstract":"The transient heat transfer of an outdoor water pool for aquaculture is presented in this paper. The location of the pool is in a mountainous region in Arequipa, Peru. An hourly temperature history of a fishpond has been investigated throughout the whole year based on a novel energy equation which considers the freezing property of water near the freezing temperature, as the ambient temperature of Arequipa sometimes drops below the water freezing point. Convective, evaporative and radiative heat exchange between the fishpond and the environment are considered by implementing established empirical equations. Computation results show a delay in the temperature response of the water to the temperature change of the ambient during summer and winter solstices days, and the same delay occurs during solar equinox days, resulting in warmer temperature of water during evening times compared to the ambient, and colder water temperature during morning hours. Furthermore, an hourly thermal load, required to keep the temperature of the fishpond at the optimal level required to rear the rainbow trout fish is presented. We found that, to keep the water temperature at an optimum value, the monthly mean specific thermal load must be between 4.36 kWh.m<ce:sup loc=\"post\">−2</ce:sup>. day<ce:sup loc=\"post\">−1</ce:sup> and 0.95 kWh.m<ce:sup loc=\"post\">−2</ce:sup>. day<ce:sup loc=\"post\">−1</ce:sup>.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"35 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on flame structure, stability, and emission characteristics of CH4-H2 swirl-induced inverse diffusion flame CH4-H2旋流反扩散火焰结构、稳定性及发射特性实验研究

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-17 DOI: 10.1016/j.csite.2025.106342

Yuseon Jeon , Man Young Kim , Heejung Jung , Seungro Lee

{"title":"Experimental study on flame structure, stability, and emission characteristics of CH4-H2 swirl-induced inverse diffusion flame","authors":"Yuseon Jeon , Man Young Kim , Heejung Jung , Seungro Lee","doi":"10.1016/j.csite.2025.106342","DOIUrl":"10.1016/j.csite.2025.106342","url":null,"abstract":"<div><div>Inverse Diffusion Flame (IDF) is a flame with a central oxidizer jet surrounded by an annular fuel jet. In this study, a swirler was inserted into the oxidizer nozzle to increase the mixing intensity. The combustion and emission characteristics of the swirl-induced IDF (S-IDF) were investigated and compared with those of non-swirl IDF (N-IDF). The flame behavior, mixing, and radical distribution were visualized to compare the combustion characteristics of the S-IDFs and N-IDFs. The flame stabilities were evaluated by measuring the blow-out and the emission characteristics were examined by measuring the NOx and CO emissions. Although the S-IDF had 90 % lower blow-out limits than N-IDF due to curtain effect induced by swirling radial flow near fuel nozzle, S-IDF showed cleaner emission performance by reducing the maximum 88 % of CO emission. Here, hydrogen addition was suggested to enhance the operating range of S-IDF while maintaining clean emissions. The hydrogen-added S-IDF (50 vol% of hydrogen addition) showed 7.5 times higher blow-out limits and 69 % lower CO emission than methane S-IDF. Based on these findings, it was confirmed that S- IDF showed a cleaner emission performance by reducing CO emission, and inferior operation range can be supported by adding hydrogen as a fuel.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106342"},"PeriodicalIF":6.4,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of energy storage battery degradation under different electrical stress levels 不同电应力水平下储能电池退化分析

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-16 DOI: 10.1016/j.csite.2025.106355

Yuanyuan Xie , Caihong Li , Tingting Wu , Run Tang , Yanxin Hu , Yishun Zhu , Huihe Qiu , Rui Zhang

{"title":"Analysis of energy storage battery degradation under different electrical stress levels","authors":"Yuanyuan Xie , Caihong Li , Tingting Wu , Run Tang , Yanxin Hu , Yishun Zhu , Huihe Qiu , Rui Zhang","doi":"10.1016/j.csite.2025.106355","DOIUrl":"10.1016/j.csite.2025.106355","url":null,"abstract":"<div><div>Exploring the aging characteristics of batteries and investigating their degradation mechanisms are crucial for optimizing battery usage and developing reliable energy storage systems. In this work, we utilize an equivalent circuit model to analyze the input and output data of the battery, identifying changes in the battery's internal parameters during the aging process. The results indicate that aging cycle tests conducted using three discharge modes—1C, 3C, and over-discharge—show capacity retention rates with linear, sub-linear, and super-linear evolutionary trajectories, respectively. During cyclic testing at 1C discharge, structural changes in the graphite anode due to prolonged cycling lead to decreased charge transfer efficiency, which is the primary cause of performance degradation. Under 3C discharge conditions, high currents result in the formation and growth of the solid electrolyte interphase (SEI) film, electrolyte decomposition, and structural changes in the electrode materials, all of which accelerate the rate of battery aging. In over-discharge mode, the main cause of aging is attributed to current collector corrosion and the decomposition of electrolyte components. Furthermore, under 3C discharge conditions, the battery performance exhibits the fastest degradation rate, with heat generation power increasing nearly threefold compared to the initial test, while the power decay rate is approximately 0.7.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106355"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimized CNN-LSTM with hybrid metaheuristic approaches for solar radiation forecasting 用混合元启发式方法优化CNN-LSTM太阳辐射预报

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-16 DOI: 10.1016/j.csite.2025.106356

İrem Fatma Şener , İhsan Tuğal

{"title":"Optimized CNN-LSTM with hybrid metaheuristic approaches for solar radiation forecasting","authors":"İrem Fatma Şener , İhsan Tuğal","doi":"10.1016/j.csite.2025.106356","DOIUrl":"10.1016/j.csite.2025.106356","url":null,"abstract":"<div><div>The increasing reliance on solar energy has underscored the need for precise forecasting of photovoltaic power outputs, with solar radiation forecasting being a critical factor. This study proposes a novel model for solar radiation forecasting using meteorological and solar radiation data. The performance of several machine learning and deep learning models, including Long Short-Term Memory, Autoregressive Integrated Moving Average, Multilayer Perceptron, Random Forest, XGBoost, Support Vector Regression, and a hybrid CNN-LSTM model, is evaluated for daily solar radiation forecasting. To improve the accuracy of the model, hyperparameter optimization is applied to the CNN-LSTM model using three metaheuristic algorithms: Particle Swarm Optimization, Grey Wolf Optimization, and Starfish Optimization Algorithm. A hybrid ensemble approach is then proposed, integrating the predictions of the three optimized CNN-LSTM models to reduce error and enhance forecasting stability. The results demonstrate that the hybrid model outperforms the individual models, achieving the lowest MAE, MSE, and RMSE while maximizing the R<sup>2</sup> score. The proposed methodology showcases the effectiveness of combining hybrid deep learning with metaheuristic optimization in solar radiation forecasting, offering a robust and adaptable framework for renewable energy applications.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106356"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical and experimental investigation of heat transfer in a dimpled and petaled array tube with a coiled twisted tape and SiC nanofluid 带有缠绕带和SiC纳米流体的凹陷花瓣阵列管传热的数值和实验研究

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-16 DOI: 10.1016/j.csite.2025.106349

Hariam Luqman Azeez , Adnan Ibrahim , Banw Omer Ahmed , Sharul Sham Dol , Ali H.A. Al-Waeli , Mahmoud Jaber

{"title":"Numerical and experimental investigation of heat transfer in a dimpled and petaled array tube with a coiled twisted tape and SiC nanofluid","authors":"Hariam Luqman Azeez , Adnan Ibrahim , Banw Omer Ahmed , Sharul Sham Dol , Ali H.A. Al-Waeli , Mahmoud Jaber","doi":"10.1016/j.csite.2025.106349","DOIUrl":"10.1016/j.csite.2025.106349","url":null,"abstract":"<div><div>Thermal efficiency challenges are common in absorber tube designs. This study proposes an innovative absorber tube featuring dimples and petal arrays on its surface, integrated with a coiled twisted tape, and circulating a 0.9 % volume concentration of silicon carbide (SiC)-enhanced nanofluid. Fixing heat flux at 1000 W/m<sup>2</sup> and Reynold number between 720 and 5030, Computational Fluid Dynamics (CFD) was employed to optimize key dimple parameters, encompassing dimple lines number (ranging from 2 to 6), dimple diameter (1–5 mm), dimple height (0.8–2 mm), and dimple pitch distance (10–30 mm). Additionally, Thermohydraulic Performance Factor (THPF) assessment was conducted experimentally to examine the impact of petal arrays, coil, twisted tape, and three concentrations of SiC-enhanced nanofluid on the optimized dimple tube. The results indicate that a configuration with five dimple lines, a dimple diameter of 3 mm, a dimple height of 1.4 mm, and a dimple pitch distance of 10 mm provides optimal heat transfer augmentation. Furthermore, incorporating 0.9 % SiC with a coiled twisted tape into the optimized dimpled and petaled array tube design enhances the THPF by 71.1 %, demonstrating a substantial improvement in thermohydraulic performance.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106349"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Employing thermochromic material to improve the building thermal environment in Qingdao city 应用热致变色材料改善青岛市建筑热环境

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-16 DOI: 10.1016/j.csite.2025.106351

Chenxi Hu , Wenkai Fu , Xi Meng , Fan He , Hiroatsu Fukuda

{"title":"Employing thermochromic material to improve the building thermal environment in Qingdao city","authors":"Chenxi Hu , Wenkai Fu , Xi Meng , Fan He , Hiroatsu Fukuda","doi":"10.1016/j.csite.2025.106351","DOIUrl":"10.1016/j.csite.2025.106351","url":null,"abstract":"<div><div>Utilizing novel building envelope materials to mitigate urban heat is an effective measure. Among the many new cooling building materials, cooling coatings are notable for their superior solar reflectance and thermal emissivity, properties that help reduce cooling loads by lowering surface temperatures. However, these static reflective coatings are unable to meet the changing thermal demands in regions with significant seasonal temperature differences, such as hot summers and cold winters. To address this challenge, this study proposes a thermochromic material (TCM) with dynamic self-adjusting reflectivity properties. The TCM is able to change its color and solar reflectivity in response to temperature changes, effectively adapting to the varying thermal demands between winter and summer. In addition, this study evaluated the difference in thermal performance of TCM in summer and winter by conducting experiments on a scaled-down building model. The experiments monitored the external surface temperature, internal surface temperature and cavity temperature, revealing the seasonal energy saving benefits of the TCM. Numerical simulations through Energyplus software further evaluated the heating and cooling degree days and energy carbon emission metrics, providing energy saving directions for optimizing the photo-thermal response properties of thermochromic coatings.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106351"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance assessment of rotating spiral-shaped baffles built-in solar air heater: 4E and sustainability analysis 旋转螺旋形挡板内置太阳能空气加热器的性能评估：4E和可持续性分析

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-16 DOI: 10.1016/j.csite.2025.106345

Yogeshkumar Khimsuriya , D.K. Patel , Vivek Patel , Vinay Pandit , Hashim Sahar Mohaisen , Lav Kumar Kaushik , Pranav Mehta , Himesh Patel

{"title":"Performance assessment of rotating spiral-shaped baffles built-in solar air heater: 4E and sustainability analysis","authors":"Yogeshkumar Khimsuriya , D.K. Patel , Vivek Patel , Vinay Pandit , Hashim Sahar Mohaisen , Lav Kumar Kaushik , Pranav Mehta , Himesh Patel","doi":"10.1016/j.csite.2025.106345","DOIUrl":"10.1016/j.csite.2025.106345","url":null,"abstract":"<div><div>Solar air heaters (SAHs) often face efficiency limitations due to heat transfer challenges. Integrating roughness elements on the absorber plate is a common strategy, but stationary roughness induces hot spots and thermal wake zones, hindering convective heat transfer. To mitigate these issues, this study investigates a modified SAH with novel rotating spiral-shaped baffles using a 4E framework—energy, exergy, exergoeconomic, and enviroeconomic perspectives. Results demonstrate superior performance, with configurations at P/e = 8 and e/H = 0.8 achieving peak useful heat gains of 156.78 W. The modified SAH attains daily average thermal, exergy, and thermohydraulic efficiencies of 29.55 %, 14.59 %, and 7.24 %, respectively. Exergoeconomic analysis yields a maximum parameter of 0.36 kWh/$ over 30 years, while enviroeconomic assessments indicate a reduction in CO<sub>2</sub> emissions from 17.14 to 5.71 kg/year, with carbon credit earnings between $102.86 and $308.57. Future research can further enhance performance through novel storage media, optimized baffle design, intelligent controls, and advanced heat exchangers.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106345"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a structural model with dynamic thermal conductivity for composite phase change materials: Numerical and experimental investigations 复合相变材料动态导热结构模型的建立：数值与实验研究

IF 6.4 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2025-05-16 DOI: 10.1016/j.csite.2025.106348

Feng Hou , Leilei Li , Xiaoning Cai , Hairuo Wang , Nina Gong , Yazhi Zhu , Hui Wang

{"title":"Development of a structural model with dynamic thermal conductivity for composite phase change materials: Numerical and experimental investigations","authors":"Feng Hou , Leilei Li , Xiaoning Cai , Hairuo Wang , Nina Gong , Yazhi Zhu , Hui Wang","doi":"10.1016/j.csite.2025.106348","DOIUrl":"10.1016/j.csite.2025.106348","url":null,"abstract":"<div><div>To address the thermal regulation optimization of composite phase change materials (CPCMs) in building envelopes, this study proposes a three-dimensional heat transfer model incorporating dynamic effective thermal conductivity. The model explicitly considers the random distribution of spherical phase change macrocapsules (SPCMs) with metal shell thickness of 0.445 mm within a cementitious matrix. Innovatively, the enhanced heat transfer effect from natural convection in liquid PCM is dynamically coupled into the effective thermal conductivity, enabling real-time coupling between mesoscale structural changes and macroscopic thermal response. Experimental validations demonstrate that the model exhibits high prediction accuracy for temperature fluctuations on the phase-change plateau and energy storage efficiency. Parametric analyses reveal that increasing the SPCMs volume fraction from 5.07 % to 24.86 % extends the duration of the phase-change plateau by 147.4 % and enhances the latent heat storage density by 400 %. Furthermore, elevating PCM latent heat from 140 kJ/kg to 260 kJ/kg results in a total energy storage capacity increase of 31.1 %. However, increasing the phase-change temperature from 27 °C to 33 °C significantly decreases the storage efficiency by 81.3 %, highlighting a critical trade-off between material thermodynamic properties and environmental compatibility. This research provides essential theoretical insights for performance optimization of CPCMs in green building systems.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"72 ","pages":"Article 106348"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0