Journal of Thermal Analysis and Calorimetry最新文献

The tribological effect on hydrogen engine oil blended with different fatty acid contents of coconut and palm oil 不同脂肪酸含量的椰子油和棕榈油对氢发动机油的摩擦学影响

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-16081-3

Aiman Yahaya, Syahrullail Samion, Zulhanafi Paiman, Afiq Witri Yazid

{"title":"The tribological effect on hydrogen engine oil blended with different fatty acid contents of coconut and palm oil","authors":"Aiman Yahaya, Syahrullail Samion, Zulhanafi Paiman, Afiq Witri Yazid","doi":"10.1007/s10973-026-16081-3","DOIUrl":"10.1007/s10973-026-16081-3","url":null,"abstract":"<div><p>This study investigates the physicochemical, rheological, thermal, and tribological behavior of engine oil blended with coconut oil (CO) and palm oil (PO) at 30% and 50% ratios, aiming to develop bio-based lubricants for hydrogen internal combustion engines (H2ICEs). Thermal stability analysis using TGA revealed that the EC2 blend (50% CO) exhibited the highest degradation onset temperature of 240.3 °C, an 18.7% improvement over pure engine oil (202.4 °C). This enhanced thermal resistance delays oxidative breakdown at elevated combustion temperatures, enabling the lubricant to maintain viscosity and film integrity. As a result, EC2 achieved a 12.5% reduction in coefficient of friction under high load (700 N), demonstrating the direct benefit of thermal stability on tribological performance. Similarly, rheological analysis showed that EC1 (30% CO) and EP1 (30% PO) had the highest viscosity indices (105 and 104), ensuring stable lubrication across a wide temperature range. Tribological tests confirmed that EP1, with its long-chain fatty acid contribution, achieved a 31.87% and 24.44% reduction in wear scar diameter under variable load and speeds. These results show the potential of optimized CO and PO bio-lubricants to extend component life and promote sustainable hydrogen ICE applications, providing a foundation for next-generation clean energy lubricants.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15235 - 15251"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Direct steam generation for next-generation concentrated solar power: technologies, challenges, and future directions 下一代聚光太阳能的直接蒸汽发电：技术、挑战和未来方向

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-16033-x

Zeshan Aslam, Syed Ihtsham Ul Haq Gilani, Taib Iskandar Mohamad, Masdi Muhammad, Kehinde Temitope Alao, Muzaffar Ali

{"title":"Direct steam generation for next-generation concentrated solar power: technologies, challenges, and future directions","authors":"Zeshan Aslam, Syed Ihtsham Ul Haq Gilani, Taib Iskandar Mohamad, Masdi Muhammad, Kehinde Temitope Alao, Muzaffar Ali","doi":"10.1007/s10973-026-16033-x","DOIUrl":"10.1007/s10973-026-16033-x","url":null,"abstract":"<div><p>Direct steam generation (DSG) is a promising concentrated solar power (CSP) technology that offers higher thermal efficiency and simpler plant layouts by eliminating heat exchangers and intermediate heat-transfer fluids. Despite significant technological progress, it has not yet achieved widespread commercial maturity. This systematic review critically evaluates recent advances in DSG-based CSP systems across thermal–hydraulic behavior, receiver design, thermal energy storage (TES), hybrid integration, control strategies, and techno-economic feasibility. Key findings highlight the challenge of managing complex two-phase flow and transient solar input, demanding adaptive control frameworks and robust system design. Advances in absorber geometries, coatings, and passive heat-transfer enhancements show promise for mitigating non-uniform heat flux and thermal stress, though long-term durability under daily cycling remains underexplored. TES, particularly hybrid sensible and latent systems, is crucial for dispatchability but faces material and integration constraints. Hybridization with biomass or combined cycles improves flexibility and reliability but requires careful cost–benefit evaluation. Techno-economic studies indicate competitive levelized cost of electricity in high-DNI regions, depending on improvements in thermal reliability, component durability, and large-scale demonstrations. Overall, this review consolidates technological progress, identifies persistent knowledge gaps, and outlines research priorities to enable reliable, cost-effective, and low-carbon deployment of next-generation DSG-enabled CSP systems.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"14917 - 14951"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thermodynamic irreversibility on a peristaltic transport of CNT-based hybrid nanofluid flow over an elastic tube with sensitivity analysis 基于碳纳米管的混合纳米流体在弹性管上蠕动输运的热力学不可逆性及灵敏度分析

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-16021-1

Muhammad Naveed Khan, Awatif Alhowaity, Nadia Ayari, N. Ameer Ahammad, Mohamed Abdelghany Elkotb

{"title":"Thermodynamic irreversibility on a peristaltic transport of CNT-based hybrid nanofluid flow over an elastic tube with sensitivity analysis","authors":"Muhammad Naveed Khan, Awatif Alhowaity, Nadia Ayari, N. Ameer Ahammad, Mohamed Abdelghany Elkotb","doi":"10.1007/s10973-026-16021-1","DOIUrl":"10.1007/s10973-026-16021-1","url":null,"abstract":"<div><p>This study has direct implications for biomedical pumps, microfluidic coolers, and flexible heat exchanger design by providing new strategies for enhancing thermal performance while reducing energy losses. Accordingly, the present work investigates the peristaltic transport of an MHD hybrid nanofluid containing SWCNTs and MWCNTs through a curved compliant tube under the combined influences of Hall current, Darcy resistance, velocity and thermal slip, and wall elasticity. A mathematical model is formulated to incorporate electromagnetic effects, porous medium permeability, internal heat generation, and thermodynamic irreversibility. Exact analytical solutions for the momentum, energy, entropy generation, and Bejan number equations are obtained using the perturbation method and validated against finite difference solutions. The analytical predictions exhibit excellent agreement with the numerical results, with maximum relative errors below 1.19% for velocity and 0.25% for temperature. The local sensitivity analysis identifies the curvature parameter (+ 1.80) as the most influential factor, followed by the magnetic parameter (− 1.40)<b>,</b> Darcy number (+ 1.00)<b>,</b> velocity slip (+ 0.70)<b>,</b> and Hall parameter (− 0.50). These quantitative findings demonstrate that channel geometry predominantly enhances flow and heat transfer, whereas magnetic effects act as the principal resistive mechanism. Overall, the proposed model provides a unified thermodynamic framework for minimizing irreversibility and optimizing the performance of hybrid nanofluid-based peristaltic transport systems in biomedical and thermal engineering applications.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15829 - 15850"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 enhancement of a solar still using thermal energy storage and innovative designs: recent progress, challenges, and future directions 利用热能储存和创新设计提高太阳能蒸馏器的性能：最新进展、挑战和未来方向

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-15774-z

Riya Guha, Niraj Kumar, Ashok Kumar Yadav, Aqueel Ahmad, Ashok Kumar Dewangan, Anirban Sur

{"title":"Performance enhancement of a solar still using thermal energy storage and innovative designs: recent progress, challenges, and future directions","authors":"Riya Guha, Niraj Kumar, Ashok Kumar Yadav, Aqueel Ahmad, Ashok Kumar Dewangan, Anirban Sur","doi":"10.1007/s10973-026-15774-z","DOIUrl":"10.1007/s10973-026-15774-z","url":null,"abstract":"<div><p>Solar distillation is an environmentally friendly method of producing freshwater, yet its use at large is constrained by low productivity (usually 3 L m<sup>−2</sup> day<sup>−1</sup>) and reliance on the daytime solar radiation. Thermal energy storage (TES) materials, especially phase change materials (PCMs) and nanoparticle-enhanced PCMs (NePCMs), are promising solutions to extend operation into non-sunlight hours and improve thermal efficiency. The reviewed studies show that the use of TES can enhance productivity by 20–75%, and NePCMs can significantly improve thermal conductivity and heat retention. This review summarizes recent experimental and numerical advances in PCM- and NePCM-based solar stills including encapsulation techniques, material placement, and thermal performance under varying climatic conditions. It also examines novel designs such as multi-stage and wick-type solar stills, as well as hybrid systems that integrate auxiliary heating and geometric optimization to improve freshwater production and efficiency. Recent developments in PCM encapsulation have enhanced thermal stability and durability, while optimized integration of TES has improved energy storage, thermal management, and cost-effectiveness. This review highlights present challenges and future research directions for PCM-based TES systems that can enhance the competitiveness of solar desalination technologies while contributing to the SDGs 6 and 13 through sustainable and energy-efficient water purification.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"14953 - 14983"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10973-026-15774-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Random forest and XGBoost network learning on Darcy–Forchheimer magneto-bioconvection and entropy generation in a ferrofluid-filled porous wavy enclosure 随机森林和XGBoost网络学习的Darcy-Forchheimer磁生物对流和熵生成在铁磁流体填充的多孔波壳

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-15988-1

Tarikul Islam, Sílvio Gama, Marco Martins Afonso

{"title":"Random forest and XGBoost network learning on Darcy–Forchheimer magneto-bioconvection and entropy generation in a ferrofluid-filled porous wavy enclosure","authors":"Tarikul Islam, Sílvio Gama, Marco Martins Afonso","doi":"10.1007/s10973-026-15988-1","DOIUrl":"10.1007/s10973-026-15988-1","url":null,"abstract":"<div><p>This study presents a multiphysics analysis of bioconvection of nonlinear Darcy–Forchheimer drag, entropy generation, and heat–mass transport of a ferrofluid (Fe<sub>3</sub>O<sub>4</sub>-PG-W) in a porous wavy cavity under the influence of nonuniform magnetic forcing. An integrated finite element method (FEM) combined with a surrogate random forest (RF) model is employed and compared with artificial neural networks (ANN) and extreme gradient boosting (XGBoost). Thermodynamic irreversibility due to heat transfer, viscous dissipation, magneto-hydrodynamics, mass transfer, and microorganisms’ diffusion is quantified. Convective transport increases with porosity (<i>ε</i>ₚ) and Darcy number (Da), while magnetic forcing suppresses it. Raising Da from 10<sup>−5</sup> to 10<sup>−1</sup>, at <i>ε</i>ₚ = 0.6 and Rayleigh number Ra = 10<sup>6</sup>, increases the average Nusselt number by about 40% and reduces entropy generation by one order of magnitude. Under high-Ra conditions, the Darcy–Forchheimer model predicts lower heat transfer and entropy generation than the pure Darcy model. Increasing the Hartmann number (Ha) from 0 to 100 almost halves the Bejan number, indicating a shift from thermal to viscous irreversibility due to magnetic damping. Stronger bioconvective buoyancy enhances both fluid velocity and total entropy, reflecting the dual role of microbial motility in promoting convection and irreversibility. Regression and sensitivity analyses identify Ra and Da as the dominant parameters governing thermal transport, whereas Ha and the bioconvection Rayleigh number exert suppressing effects. The surrogate RF model shows the highest performance, with <i>R</i><sup>2</sup> close to 0.99, and the smallest training–testing gaps, outperforming both XGBoost and ANN. These findings can be used for designing magnetically controlled biothermal management and porous transport systems in bioengineering.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15607 - 15640"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 intensification of a multi-basin stepped solar still using a passive cooling tower and wick-based enhancement 采用被动式冷却塔和灯芯增强的多盆阶梯式太阳能蒸馏器的热强化

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-15962-x

K. S. Maheswari, K. Mayandi, S. Joe Patrick Gnanaraj, M. Yuvaperiyasamy, Vanthana Jeyasingh

{"title":"Thermal intensification of a multi-basin stepped solar still using a passive cooling tower and wick-based enhancement","authors":"K. S. Maheswari, K. Mayandi, S. Joe Patrick Gnanaraj, M. Yuvaperiyasamy, Vanthana Jeyasingh","doi":"10.1007/s10973-026-15962-x","DOIUrl":"10.1007/s10973-026-15962-x","url":null,"abstract":"<div><p>The low freshwater productivity of conventional solar stills remains a major limitation for their large-scale application in sustainable desalination. The present study experimentally investigates the thermal intensification of a four-basin stepped solar still through three passive enhancement strategies: (i) passive cooling tower integration for improved condensation, (ii) wick-assisted evaporation enhancement, and (iii) a hybrid configuration combining both techniques. The cooling tower reduced the inner glass temperature by approximately 5–9 °C, while the wick material enhanced basin water heating through thin-film evaporation. Experimental investigations were conducted under identical climatic conditions, and thermal behaviour, productivity, and efficiency were systematically evaluated. The results demonstrated that the conventional system produced 20.305 L day<sup>−1</sup> of freshwater, whereas the cooling tower and wick-assisted configurations achieved 23.82 and 22.95 L day<sup>−1</sup>, respectively. The hybrid configuration achieved the highest productivity of 26.40 L day<sup>−1</sup>, a 30% improvement over the conventional system. Similarly, the thermal efficiency increased from 32.1 to 41.9% in the hybrid arrangement. The novelty of the present work lies in the integration of wick-assisted thin-film evaporation and passive natural draft cooling in a fully passive multi-basin stepped solar still without requiring external energy input. The proposed system offers a low-cost, energy-independent, and sustainable solution for freshwater production in remote and water-scarce regions.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15561 - 15584"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A comparative study of curing kinetics in formaldehyde-based wood adhesives using isothermal rheology and ABES 用等温流变学和ABES对甲醛基木材胶粘剂固化动力学的比较研究

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-16077-z

Latifeh Nasseri, Pia Solt-Rindler, Roland Mitter, Johann Moser, Andreas Kandelbauer, Johannes Konnerth, Hendrikus WG. Van Herwijnen

{"title":"A comparative study of curing kinetics in formaldehyde-based wood adhesives using isothermal rheology and ABES","authors":"Latifeh Nasseri, Pia Solt-Rindler, Roland Mitter, Johann Moser, Andreas Kandelbauer, Johannes Konnerth, Hendrikus WG. Van Herwijnen","doi":"10.1007/s10973-026-16077-z","DOIUrl":"10.1007/s10973-026-16077-z","url":null,"abstract":"<div><p>A variety of techniques exist to study the curing behavior of wood adhesives throughout the hot-pressing. Nonetheless, correlating these techniques is challenging, primarily due to the inherent differences in their operational principles and measurement conditions. This study correlates the chemical, rheological and mechanical aspects of adhesive curing using differential scanning calorimetry (DSC), rheometry and Automated Bonding Evaluation System (ABES), respectively. DSC determines the chemical curing degree, and rheometry captures both chemical and physical aspects of curing, while ABES simulates adhesive bond strength development by focusing on mechanical changes. Results reveal that the rheological curing degree exhibits a higher reaction rate than the mechanical curing degree from ABES. DSC was also used to measure the residual enthalpy of adhesives after isothermal curing using rheometry or ABES. The results suggest that the tested adhesives cannot be considered fully chemically cured when complex viscosity and shear strength reach their maximum values. Dynamic DSC analyses were used for the prediction of the curing degree at isothermal conditions. At higher curing temperatures, the differences between the resulting conversion degrees from DSC, rheometry, and ABES techniques decrease. DSC is highly sensitive to reaction onset, while rheometry more accurately tracks curing progress through viscosity changes. ABES lacks sensitivity to chemical progression but offers practical mechanical insights. Furthermore, the time to reach the minimum activation energy was determined using the isoconversional principle. It was found that the activation energy achieves its minimum in the immediate vicinity of the gel and the storage and loss moduli crossover point for tested amino resins.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15253 - 15268"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10973-026-16077-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the catalytic pyrolysis characteristics and kinetics of pine sawdust 松木木屑催化热解特性及动力学研究

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-10 DOI: 10.1007/s10973-026-16074-2

Liang Zhang, Changying Wang, Bing Wang

{"title":"Research on the catalytic pyrolysis characteristics and kinetics of pine sawdust","authors":"Liang Zhang, Changying Wang, Bing Wang","doi":"10.1007/s10973-026-16074-2","DOIUrl":"10.1007/s10973-026-16074-2","url":null,"abstract":"<div><p>Biomass fast catalytic pyrolysis efficiently converts organic materials into high-value products. However, the lack of comprehensive kinetic data constrains the rational design and scale-up of pyrolysis reactors, thereby impeding the optimization of product distribution and the overall process efficiency. To establish comprehensive kinetic insights, the pyrolysis of pine sawdust (PS) was catalyzed using two low-cost industrial wastes with distinct acid–base properties: spent fluid catalytic cracking (FCC) catalyst and red mud (RM). The Friedman, FWO, and distributed activation energy model (DAEM) methods were applied to analyze the catalytic pyrolysis process, all of which demonstrated high fitting accuracy. The effective activation energies derived from the Friedman and FWO isoconversional methods ranged between 140 and 220 kJ mol<sup>−1</sup>, while the distributed activation energy model (DAEM) yielded component-specific values up to approximately 238 kJ mol<sup>−1</sup>. Industrial waste catalysts effectively lowered the <i>E</i><sub>a</sub>, with the FCC catalyst exhibiting the strongest effect: the average <i>E</i><sub>a</sub> derived from the FWO and Friedman methods were 173.20 kJ mol<sup>−1</sup> and 170.91 kJ mol<sup>−1</sup>, respectively. DAEM further revealed that the acidic-type catalyst (FCC) tended to reduce the <i>E</i><sub>a</sub> of CNT1 (hemicellulose) and CNT3 (lignin), while alkaline catalysts mainly lowered those of CNT1 and CNT2 (cellulose). A comparative evaluation of the isoconversional and model-fitting methods indicated that DAEM provided complementary insights into high-temperature component decomposition, whereas the isoconversional methods more clearly elucidated the overall influence of catalysts on the pyrolysis process.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15641 - 15657"},"PeriodicalIF":4.1,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thermo-chemical evolution and thermal stability of lignin–biochar-based coatings investigated by thermal analysis 热分析研究了木质素-生物炭基涂料的热化学演化和热稳定性

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-08 DOI: 10.1007/s10973-026-16072-4

Hwayoung Lee, Jihee Nam, Dongchan Jin, Sumin Kim

{"title":"Thermo-chemical evolution and thermal stability of lignin–biochar-based coatings investigated by thermal analysis","authors":"Hwayoung Lee, Jihee Nam, Dongchan Jin, Sumin Kim","doi":"10.1007/s10973-026-16072-4","DOIUrl":"10.1007/s10973-026-16072-4","url":null,"abstract":"<div><p>Instead of focusing on application-driven performance claims, this study examines how the incorporation of biochar alters the thermo-chemical behavior of lignin-based coating systems through a thermal analysis approach. Aqueous lignin matrices containing wood-derived biochar (0, 1, and 5 mass%) were prepared under alkaline conditions and applied as surface coatings on medium-density fiberboard. Thermogravimetric analysis (TGA) under nitrogen and air atmospheres was employed to compare mass loss stages, derivative thermogravimetric characteristics, and residue evolution with biochar content. The results show that incorporation of biochar delayed the onset of mass loss events and moderated DTG peak intensities, suggesting formulation-dependent stabilization during thermo-chemical transformation, while high-temperature DTG maxima were interpreted as residue-related features associated with gradual carbon structure evolution rather than primary decomposition events. Fourier transform infrared spectroscopy (FT-IR) revealed attenuation of hydroxyl and aliphatic bands with increasing biochar content, accompanied by relative enhancement of aromatic and carbonyl features, consistent with physical associations between lignin and biochar within the binder matrix. Thermal conductivity exhibited a nonlinear response to biochar loading, with the lowest value observed at 1 mass% biochar, whereas higher loading increased conductivity. Scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM–EDS) analysis confirmed the presence of biochar-derived mineral constituents (e.g., Ca, Si, and K) on the coated surface. This study provides thermally focused insight into how biochar incorporation influences degradation behavior, residue formation, and heat transfer response in lignin-based coating systems, highlighting the value of combined thermal analysis and spectroscopic characterization for bio-derived coating materials.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15415 - 15434"},"PeriodicalIF":4.1,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Vehicle-level energy flow simulation and thermal management strategy optimization for battery electric vehicles 纯电动汽车整车级能量流仿真及热管理策略优化

IF 4.1 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2026-08-08 DOI: 10.1007/s10973-026-16102-1

Li Ye, Baiming Liao, Wenhan Qin, Min Feng, Fucheng Wei

{"title":"Vehicle-level energy flow simulation and thermal management strategy optimization for battery electric vehicles","authors":"Li Ye, Baiming Liao, Wenhan Qin, Min Feng, Fucheng Wei","doi":"10.1007/s10973-026-16102-1","DOIUrl":"10.1007/s10973-026-16102-1","url":null,"abstract":"<div><p>The energy consumption and driving range of battery electric vehicles (BEVs) are strongly affected by the coupled operation of the powertrain and thermal management systems under extreme ambient temperatures. A vehicle-level energy-flow model of a front-wheel-drive BEV was established using the AMESim platform, measured vehicle parameters, and China Light-duty Vehicle Test Cycle (CLTC) energy-flow data. The model couples the powertrain, battery heat generation, passenger-cabin thermal load, battery thermal loop, air-conditioning loop, Positive Temperature Coefficient (PTC) heaters, and auxiliary electrical loads. Validation showed that the relative errors of the main energy-flow components were within ± 5%, while the driving-range error was 1.06%. Three cooling-priority strategies and five battery target temperatures were evaluated. Under high-temperature conditions, battery-priority cooling produced the longest driving range and lowest energy consumption, but the advantage was marginal: the maximum differences among the strategies were 0.71% in driving range and 1.06% in energy consumption. Cooling priority therefore mainly affected the transient thermal responses of the cabin and battery. Under low-temperature conditions, a battery target temperature of 5 °C minimized PTC energy consumption and produced the longest driving range in repeated-CLTC simulations. This represents a short-term energy-efficiency optimum rather than a comprehensive operating optimum because battery aging, increased internal resistance, and power limitations at low temperature were not included. The model provides a vehicle-level framework for comparing thermal management strategies, while full-cycle temperature validation and compressor-capacity sensitivity remain necessary.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"151 18","pages":"15659 - 15673"},"PeriodicalIF":4.1,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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