Journal of energy storage最新文献_第4页

Experimental study on the thermal performance of a large 100 MJ cascaded packed-bed thermal energy storage system with macro-encapsulation of phase change materials 相变材料大封装的大型100 MJ级联填充床蓄热系统热性能实验研究

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117193

Meng-Jie Li , Ming-Jia Li , Chang-Hao Fan , Zhan-Bin Liu

{"title":"Experimental study on the thermal performance of a large 100 MJ cascaded packed-bed thermal energy storage system with macro-encapsulation of phase change materials","authors":"Meng-Jie Li , Ming-Jia Li , Chang-Hao Fan , Zhan-Bin Liu","doi":"10.1016/j.est.2025.117193","DOIUrl":"10.1016/j.est.2025.117193","url":null,"abstract":"<div><div>While Phase Change Materials (PCMs) offer high theoretical heat storage capacity, their practical performance in Thermal Energy Storage (TES) systems is often limited by operational constraints such as thermocline, cut-off temperatures, and operating time. To address these challenges, this study introduces a novel macro-encapsulation method to fabricate 8600 stainless steel PCM capsules with validated high-temperature resistance and leak-proof integrity. Using this method, we established a 100 MJ cascaded packed-bed TES system and systematically evaluated its thermal performance under real-world operating conditions. Subsequent experimental analysis compared the effects of varying inlet temperatures and outlet cut-off thresholds on charging/discharging efficiency. Experimental results indicate that during charging process, increasing the inlet temperature within the TES device's range not only enhances thermal storage capacity but also improves energy storage efficiency. For instance, raising the charging inlet temperature from 120 °C to 180 °C increased thermal storage efficiency from 70.4 % to 97.3 %, with effective thermal energy storage density rising from 21.43 kWh/m<sup>3</sup> to 53.77 kWh/m<sup>3</sup>. Conversely, during discharging process, reducing the inlet temperature not only enhances the discharge power but also increases the released heat. To fully release the stored heat, the discharge inlet temperature should be below the lowest phase-change temperature of PCM within TES devices. The discharge cut-off temperature is determined by practical application scenarios, with higher cut-off temperatures imposing stricter requirements for outlet temperature during discharging process, resulting in less released heat and lower thermal energy storage density. This work has applicability in thermal storage and utilization contexts and serves as a valuable reference for the practical design of packed-bed TES systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117193"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168431","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

Progressive degradation and regeneration pathways in O3-NaNi1/3Fe1/3Mn1/3O2 under long-term low-humidity air exposure 长期低湿空气暴露下O3-NaNi1/3Fe1/3Mn1/3O2的递进降解和再生途径

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117080

Weijia Tang, Yunjiao Li, Shijie Jiang, Changlong Lei, Zhenjiang He

{"title":"Progressive degradation and regeneration pathways in O3-NaNi1/3Fe1/3Mn1/3O2 under long-term low-humidity air exposure","authors":"Weijia Tang, Yunjiao Li, Shijie Jiang, Changlong Lei, Zhenjiang He","doi":"10.1016/j.est.2025.117080","DOIUrl":"10.1016/j.est.2025.117080","url":null,"abstract":"<div><div>This study systematically reveals the failure mechanisms of O3-type layered oxide NaNi<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> (NFM) during long-term air exposure and their impact on electrochemical performance. Through multi-scale characterization, including X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR), combined with electrochemical analysis, we demonstrate that Na+ migration and CO<sub>2</sub>/H<sub>2</sub>O synergistic reactions are the primary drivers of degradation. These processes induce the progressive growth of surface Na<sub>2</sub>CO<sub>3</sub>/HCO<sub>3</sub><sup>−</sup> impurities, accompanied by lattice distortion (a-axis contraction by 0.94 % and c-axis expansion by 0.74 %) and partial Mn<sup>3+</sup> oxidation (Mn<sup>4+</sup> proportion increased to 52.6 %). These combined effects result in severe electrochemical deterioration: samples exposed for 15 days exhibit a 50.3 % initial capacity decay (from 129.9 to 64.6 mAh/g), and a tenfold decrease in Na<sup>+</sup> diffusion coefficient. Notably, a 7-day exposure to a CO<sub>2</sub> atmosphere with trace moisture triggers surface carbonation reactions, emphasizing exposure duration as a critical variable under trace moisture conditions. Furthermore, this study proposes a ‘de-intercalation-framework reversibility’ mechanism: although water soaking induces 80 % Na<sup>+</sup> extraction and partial TM-O framework distortion, low-temperature re-sodiation effectively repairs the lattice and restores the O3 structure. These findings provide theoretical insights and technical pathways for the failure prevention and regeneration of highly air-sensitive sodium-ion cathode materials.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117080"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154972","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 and calculation of the winding loss and rotor loss of solid rotor induction motors for flywheel energy storage system considering the influence of inverter power supply 考虑逆变电源影响的飞轮储能系统固体转子感应电动机绕组损耗和转子损耗分析与计算

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117224

Hao Xu, Jinghong Zhao, Yiyong Xiong, Yunchen Duan

{"title":"Analysis and calculation of the winding loss and rotor loss of solid rotor induction motors for flywheel energy storage system considering the influence of inverter power supply","authors":"Hao Xu, Jinghong Zhao, Yiyong Xiong, Yunchen Duan","doi":"10.1016/j.est.2025.117224","DOIUrl":"10.1016/j.est.2025.117224","url":null,"abstract":"<div><div>The high-speed solid rotor induction motor (SRIM) has been widely used in the flywheel energy storage system. The loss of the high-speed SRIM directly affects the energy conversion efficiency of flywheel energy storage system. In order to realize the fast and accurate calculation of the loss in the motor design stage, the analytical models of the winding AC loss and rotor loss of the high-speed SRIM supplied by inverter are established. Based on the principle of area equivalence, the layered method is adopted to consider the influence of stator slot type and irregular conductor distribution in the slot. Besides, the analytical model of the winding AC loss can consider the influence of radial magnetic field and spatial harmonic. The eddy current effect, hysteresis effect and saturation effect of the rotor can be considered by using the layering method. The harmonic distribution of phase voltage and phase current is obtained by circuit simulation. On this basis, the winding AC loss and rotor loss are calculated under the condition of inverter power supply. Besides, the effects of current frequency, conductor diameter and carrier wave ratio on the winding AC loss are studied, and the effects of the air gap length and carrier wave ratio on the rotor loss are studied. Finally, an experimental platform for the loss and temperature rise characteristics of the high-speed SRIM is built, and the accuracy of analytical calculation and finite element simulation is verified through the winding temperature rise experiment and rotor loss experiment.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117224"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154974","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

0D electrochemical modelling of sulfur cathodes 硫阴极的电化学建模

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117023

Hamid Mollania , Majid Oloomi-Buygi , Andreu Cabot

{"title":"0D electrochemical modelling of sulfur cathodes","authors":"Hamid Mollania , Majid Oloomi-Buygi , Andreu Cabot","doi":"10.1016/j.est.2025.117023","DOIUrl":"10.1016/j.est.2025.117023","url":null,"abstract":"<div><div>Sulfur cathodes represent a promising solution to meet the growing demand for cost-effective, sustainable, and high-energy-density energy storage systems utilizing abundant elements. However, their commercialization remains challenging due to the complex metal‑sulfur reactions, which often involve solid-liquid phase transitions, as well as the dissolution and migration of polysulfides. Addressing these challenges requires a deeper understanding and systematic optimization of these processes. In this study, we present a three-step zero-dimensional (0D) electrochemical model based on Nernst formulations and Butler–Volmer kinetics designed to simulate the performance of sulfur cathodes. Focusing on lithium‑sulfur batteries (LSBs) as a case study, the model incorporates key phenomena, including the multiple electrochemical reactions involved in the conversion of sulfur to lithium sulfide, precipitation of <span><math><msup><mi>S</mi><mrow><mn>2</mn><mo>−</mo></mrow></msup></math></span>, and the shuttle effect. To validate the model, we utilize sulfur cathodes composed of Li<sub>2</sub>S supported on Ketjen Black (KB) and incorporating cobalt nanoparticles (Li<sub>2</sub>S-Co@KB). The developed model is employed to simulate discharge curve using a hybrid optimization approach combining Bayesian and the Nelder-Mead algorithms. The model's predictive capability is evaluated by assessing its ability to replicate the experimental voltage profiles of LSBs. Additionally, the error between the simulated and experimental voltage curves is analyzed to demonstrate the model's accuracy and reliability.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117023"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144155070","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

A novel method for joint estimation of SOC and SOP based on electrochemical modeling 一种基于电化学建模的SOC和SOP联合估计新方法

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117234

Aina Tian , Tao Ding , Luyao He , Kailang Dong , Linqi Zhu , Chun Chang , Lu Lv , Jiuchun Jiang

{"title":"A novel method for joint estimation of SOC and SOP based on electrochemical modeling","authors":"Aina Tian , Tao Ding , Luyao He , Kailang Dong , Linqi Zhu , Chun Chang , Lu Lv , Jiuchun Jiang","doi":"10.1016/j.est.2025.117234","DOIUrl":"10.1016/j.est.2025.117234","url":null,"abstract":"<div><div>Lithium-ion batteries play an important role in electric vehicles, and their internal condition is crucial in battery operation safety. However, lithium-ion battery is difficult to observe the negative state owing to the relatively flat equilibrium potential of the negative electrode, resulting in an inaccurate estimation of the negative state through voltage. Therefore, a novel joint estimation method for SOC and SOP is developed in this study through electrochemical modeling, enabling precise characterization of lithium batteries internal states. First, the extended single particle model (eSPM) is established, along with a newly developed variable-scale parameter identification methodology is designed to address convergence challenges, enabling accurate extraction of the model's 21 parameters. Subsequently, a Dual Unscented Kalman Filter (DUKF)-based observer is developed to enable real-time monitoring of the battery internal state variables. Finally, the state of power prediction is accelerated by the estimated value of DUKF combined with support vector regression. The methods of this paper are validated through experiments, and the results show that the methods can realize high- accuracy battery state estimation and power prediction, which can provide technical support for detecting the safe operation of batteries.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117234"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168428","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

An aqueous organic flow battery integrating a high-capacity hexaazatrinaphthylene anode with a phenazine anolyte for hybrid energy storage 一种集成用于混合储能的高容量六氮化萘阳极和非那嗪阳极液的水相有机液流电池

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117251

Zhiwei Yuan , Kai Zheng , Juan Xu , Yong-Miao Shen , Jian Zang , Jianyu Cao

{"title":"An aqueous organic flow battery integrating a high-capacity hexaazatrinaphthylene anode with a phenazine anolyte for hybrid energy storage","authors":"Zhiwei Yuan , Kai Zheng , Juan Xu , Yong-Miao Shen , Jian Zang , Jianyu Cao","doi":"10.1016/j.est.2025.117251","DOIUrl":"10.1016/j.est.2025.117251","url":null,"abstract":"<div><div>Aqueous organic redox flow batteries (AORFBs) are promising in large-scale energy storage applications due to their environmental friendliness, decoupled energy and power, high efficiency, long lifespan, and safety. However, achieving both high accessible specific capacity and reliable cycling performance simultaneously remains challenging, primarily because concentrated organic electrolytes typically suffer from reduced diffusion coefficients, diminished interfacial redox kinetics, and increased undesirable side reactions. In this study, to circumvent these limitations, we propose a novel AORFB design combining a high-capacity hexaazatrinaphthylene (HATN) anode with a phenazine anolyte, which is further paired with a highly stable Li<sub>4</sub>[Fe(CN)<sub>6</sub>] catholyte for hybrid energy storage. This innovative AORFB cell demonstrates high energy efficiency, remarkable capacity utilization and outstanding cycling stability, attributed to the fast redox kinetics and excellent stability of both HATN and BHPC, a synergistic effect between the two, and the high mass-loading of HATN at the anode. Furthermore, a prototype three-cell AORFB stack incorporating high-loading HATN anodes is successfully constructed, achieving a power density exceeding 400 mW cm<sup>−2</sup>, a high capacity utilization of 82.3 %, and excellent cycling durability with a capacity retention of 99.953 % per cycle, showcasing its potential for large-scale energy storage.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117251"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154973","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

Green synthesized rGO@Pr₆O₁₁ nanocomposites: Efficient photocatalytic degradation of rhodamine B and enhanced energy storage performance 绿色合成rGO@Pr₆O₁₁纳米复合材料：高效光催化降解罗丹明B，增强储能性能

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117205

S. Priyanka Chakradhar , B.R. Radha Krushna , K. Manjunatha , Shih-Lung Yu , Yun-Tai Yu , Sheng Yun Wu , H. Nagabhushana

{"title":"Green synthesized rGO@Pr₆O₁₁ nanocomposites: Efficient photocatalytic degradation of rhodamine B and enhanced energy storage performance","authors":"S. Priyanka Chakradhar , B.R. Radha Krushna , K. Manjunatha , Shih-Lung Yu , Yun-Tai Yu , Sheng Yun Wu , H. Nagabhushana","doi":"10.1016/j.est.2025.117205","DOIUrl":"10.1016/j.est.2025.117205","url":null,"abstract":"<div><div>In the quest for sustainable energy solutions and effective environmental remediation, we present the innovative synthesis of graphene oxide (GO) and reduced graphene oxide (rGO) nanocomposites integrated with praseodymium oxide (Pr<sub>6</sub>O<sub>11</sub>) nanoparticles. This study underscores the vital role of these materials in addressing critical energy and environmental challenges. The nanocomposites, synthesized through a simple and eco-friendly approach, demonstrated outstanding photocatalytic efficiency, achieving 99.33 % degradation of Rhodamine B under sunlight within 180 min—significantly outperforming bare Pr<sub>6</sub>O<sub>11</sub> due to the synergistic effects of GO and rGO. In addition, detailed electrochemical evaluations using both three-electrode and two-electrode configurations revealed that the rGO@Pr₆O₁₁ nanocomposites exhibit high specific capacitance. In three-electrode configurations, the rGO@Pr₆O₁₁ nanocomposites exhibit a superior specific capacitance of 202.85 F/g (from CV measurements) and retain 89.52 % of their capacity after 10,000 cycles. In the asymmetric two-electrode configuration (rGO@Pr₆O₁₁ as the positive electrode and activated carbon as the negative electrode), the device delivered a specific capacitance of 53.42 F/g at 5 mV/s (CV) and 10.52 F/g at 1 A/g (GCD), with an energy density of 3.34 Wh/kg and a power density of 1500 W/kg. The hybrid design of Pr<sub>6</sub>O<sub>11</sub> and rGO enhances charge transfer through improved ion transport and electron conductivity, demonstrating their potential as transformative materials for energy storage and environmental remediation. This research introduces a highly efficient nanocomposite, representing a significant advancement in photocatalysis and energy storage, with promising implications for practical, real-world applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117205"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167620","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

Research progress on thermochemical adsorption heat storage technology of porous matrix loaded hydrated salt 多孔基质负载水合盐热化学吸附蓄热技术研究进展

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117040

Xueling Zhang , Haoyun Xun , Yingfang Zhou , Qi Zhang , Rijie Li , Xuehong Wu , Tingxiang Jin

{"title":"Research progress on thermochemical adsorption heat storage technology of porous matrix loaded hydrated salt","authors":"Xueling Zhang , Haoyun Xun , Yingfang Zhou , Qi Zhang , Rijie Li , Xuehong Wu , Tingxiang Jin","doi":"10.1016/j.est.2025.117040","DOIUrl":"10.1016/j.est.2025.117040","url":null,"abstract":"<div><div>Hydrated salt thermochemical adsorption heat storage is emerging as one of the most promising methods for efficient thermal energy storage. This review comprehensively examines recent advancements in the use of porous matrix-loaded hydrated salts for thermochemical heat storage. The various porous matrices and their characteristics are summarized and analyzed, along with the preparation methods for composite heat storage materials that use porous matrices to load hydrated salts: porous matrix impregnation method, compression-based stabilization method, and porous microsphere encapsulation method. Then, the mechanisms by which porous matrices enhance the thermal performance of hydrated salts are analyzed, with particular emphasis on improving thermal storage density, water adsorption capacity, thermal conductivity, and cyclic stability. Additionally, the impact of porous matrices on reaction kinetics and heat and mass transfer efficiency is discussed in depth. The strategy for optimizing system performance is analyzed in terms of system type, reactor type, internal structure, reactor parameters, and external conditions, with particular emphasis on the critical role of porous media in each component. This review identifies key challenges and provides recommendations for future research directions to advance thermochemical energy storage technologies.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117040"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168398","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

Preparation and properties of stearic acid–palmitic acid-based shaped composite phase change materials 硬脂酸-棕榈酸基异型复合相变材料的制备及性能研究

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117217

Mingzhi Zhao , Yingjie Liu , Chun Chang , Daorina Bao , Zheng Han , Rasakhodzhaev Bakhramzhan Sabirovich , Akhadou Jobir

{"title":"Preparation and properties of stearic acid–palmitic acid-based shaped composite phase change materials","authors":"Mingzhi Zhao , Yingjie Liu , Chun Chang , Daorina Bao , Zheng Han , Rasakhodzhaev Bakhramzhan Sabirovich , Akhadou Jobir","doi":"10.1016/j.est.2025.117217","DOIUrl":"10.1016/j.est.2025.117217","url":null,"abstract":"<div><div>Phase change materials (PCM) are pivotal in addressing the inherent intermittence and instability in solar heating applications by providing effective energy storage. A novel shaped PCM is fabricated by integrating modified graphite into a composite PCM substrate, using expanded graphite (EG) as a support, and modifying it with myristic acid to form modified exfoliated graphite (MEG), followed by melt blending and infiltration. The optimal mass ratio of the composite binary eutectic PCM—palmitic acid (PA) and stearic acid (SA) modified with 0.5 wt% of MEG (PA–SA/MEG<sub>0.5</sub>)—to EG is determined to be 11:1, achieving an ideal composite density of 750 kg/m<sup>3</sup>. The PSMEEG<sub>750</sub> material, composed of PA, SA, MEG, and EG at a shaping density of 750 kg/m<sup>3</sup> shows melting and solidification temperatures close to PA–SA, at 54.06 °C and 53.68 °C, respectively. However, its latent heats are slightly smaller (182.80 J/g and 177.70 J/g) compared to PA–SA. Notably, the thermal conductivity of PSMEEG<sub>750</sub> is 20.8 times greater than PA–SA, reaching 5.63 W/(m∙K), with a 17.2 % increase in specific heat capacity. After 1000 thermal cycles, the phase change latent heat of PSMEEG<sub>750</sub> only decreases by 4–4.5 %, indicating excellent leak prevention, heat storage capability, and thermal cycle stability. When integrated into solar heating systems and validated through Fluent software simulations, PSMEEG<sub>750</sub> requires less time to reach the heat storage plateau compared to PA–SA, with a relative increase in heat storage time of 26.39 %. Thus, PSMEEG<sub>750</sub> is a promising material for medium- and low-temperature solar phase change thermal energy storage systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117217"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168430","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

Enhancing indoor thermal comfort in buildings using innovative foam concrete with phase change material 采用相变材料的创新泡沫混凝土增强建筑物的室内热舒适性

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-05-28 DOI: 10.1016/j.est.2025.117100

Sultan Aslantas Kayisli, Ali Yaras

{"title":"Enhancing indoor thermal comfort in buildings using innovative foam concrete with phase change material","authors":"Sultan Aslantas Kayisli, Ali Yaras","doi":"10.1016/j.est.2025.117100","DOIUrl":"10.1016/j.est.2025.117100","url":null,"abstract":"<div><div>Energy consumption can be reduced by improving thermal performance of buildings and using energy efficiently. This can be achieved by integrating phase change material (PCM) with heat storage properties into foam concretes in building envelopes. The present study aims to prepare diatomite/capric acid (CA) composite, integrate it into foam concrete structure and enhance thermal energy performance of buildings under real weather conditions. For this purpose, it was first determined that diatomite could absorb capric acid at a maximum of 50 % (by weight) without leakage by direct impregnation. The prepared diatomite/CA composite was incorporated to foam concrete mixture as a substitute for sand aggregate at four different ratios of 15 %, 20 %, 25 % and 30 %. For diatomite/CA composite, melting and freezing temperatures and enthalpy values were found to be 28.73 °C and 28.49 °C, and 101 J/g and 193 J/g, respectively. While spreading diameter and dry unit weight values decreased as the ratio of diatomite/CA rose, water absorption and apparent porosity values increased. Thermal conductivity and compressive strength decreased depending on the increase in amount of diatomite/CA. For foam concrete with 30 % diatomite/CA, the highest water absorption, apparent porosity and compressive strength were measured as 25.9 %, 34 % and 6.31 MPa, respectively. Thermal conductivity varied between 0.495 and 0.241 W/mK. Thermoregulation test results demonstrated that foam concrete slabs containing 30 % diatomite/CA significantly improved indoor temperature regulation, achieving a cooling effect of approximately 3.7 °C during peak heat periods and contributing to a heating load reduction at night by maintaining indoor temperatures up to 8.8 °C warmer.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"128 ","pages":"Article 117100"},"PeriodicalIF":8.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154983","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