Thermal Science and Engineering Progress最新文献_第6页

Energy-economic analysis and optimization of a shell and tube heat exchanger using a multi-objective heat transfer search algorithm 利用多目标传热搜索算法对管壳式热交换器进行能源经济分析和优化

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-30 DOI: 10.1016/j.tsep.2024.103021

Parth Prajapati , Bansi D. Raja , Vivek Patel , Hussam Jouhara

This study presents the energy-economic analysis and optimization of a shell and tube heat exchanger. A water-water, segmental baffled shell and tube heat exchanger was designed using the Kern method and analysed by performing energy and economic modelling. The analysis is carried out considering the design variables on the shell side i.e. baffle cut, baffle spacing, shell diameter and tube side variables i.e. tube layout, tube outside diameter, number of tube passes and number of tubes. The multi-objective heat transfer search algorithm was used to optimize the heat exchanger for minimum total cost and maximum heat exchanger efficiency. Multiple optimal solutions were presented using the Pareto optimal curve. TOPSIS selection criteria was used to identify the optimum operating condition. Within the given bounds of the variables, the shell and tube heat exchanger can be operated at a minimum cost of 72,000 $/year resulting in 16.4 % efficiency, or, it can be operated at a maximum efficiency of 81.6 % with a total cost of 275,000 $/year. The scattered distribution of shell diameter, baffle spacing, number of tube passes and number of tubes between the lower and upper bound represent their substantial role in optimizing the heat exchanger performance. The number of tubes and tube passes showed the maximum variation in efficiency, while significantly less impact was observed when the tube layout was altered.

本研究介绍了管壳式热交换器的能源经济分析和优化。采用 Kern 方法设计了一种水-水、分段障板管壳式热交换器，并通过执行能源和经济建模进行了分析。分析时考虑了壳侧的设计变量，即挡板切口、挡板间距、壳体直径，以及管侧的变量，即管子布局、管子外径、管子通过次数和管子数量。多目标传热搜索算法用于优化热交换器，以实现最低的总成本和最高的热交换器效率。利用帕累托最优曲线提出了多个最优解。采用 TOPSIS 选择标准来确定最佳运行条件。在给定的变量范围内，管壳式热交换器的最低运行成本为 72,000 美元/年，效率为 16.4%；最高运行效率为 81.6%，总成本为 275,000 美元/年。壳体直径、挡板间距、管子通过数和管子数量在下限和上限之间的分散分布表明，它们在优化热交换器性能方面发挥着重要作用。管子数量和管子通过次数对效率的影响最大，而改变管子布局时，对效率的影响明显较小。

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引用次数: 0

Profiles of peripheral regulatory T cells forecasts the feasibility of steroid withdrawal after liver transplantation based on cellular thermal modeling 基于细胞热建模的外周调节性 T 细胞图谱预测肝移植后停用类固醇的可行性

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-30 DOI: 10.1016/j.tsep.2024.103022

Linhui Pan , Di Lu , Di Wang , Xiao Xu

After liver transplantation, steroid therapy is often used to prevent rejection. However, long-term steroid use can lead to serious side effects, therefore, this study aimed to evaluate the feasibility of peripheral regulatory T cell profiles for steroid discontinuation after liver transplantation through cellular thermal modeling and real-time monitoring of intracellular thermodynamics. In this study, cellular thermal modeling techniques were used to simulate the thermodynamic characteristics of peripheral TREgs under different conditions. The dynamic changes of peripheral Treg in liver transplantation animal models were monitored by flow cytometry and molecular biology. Significant changes in peripheral Treg profiles were observed after initiation of steroid therapy, especially in the discontinuation group, and these changes were strongly associated with the restoration of immune homeostasis. Real-time monitoring of the thermodynamic data revealed that peripheral Treg activity showed a specific temperature dependence in the cellular thermal model. Cell thermal modeling combined with real-time monitoring of intracellular thermodynamics provides a new perspective for evaluating the feasibility of peripheral regulatory T cell profiles for steroid discontinuation after liver transplantation. Strengthening the dynamic monitoring of peripheral Treg spectrum provides an important basis for the formulation of personalized immunosuppression strategies, and improves the therapeutic effect and quality of life of liver transplant patients.

肝移植后，类固醇疗法通常用于预防排斥反应。然而，长期使用类固醇会导致严重的副作用，因此，本研究旨在通过细胞热建模和实时监测细胞内热力学，评估肝移植后外周调节性T细胞停用类固醇的可行性。本研究利用细胞热建模技术模拟了外周调节性T细胞在不同条件下的热力学特征。流式细胞术和分子生物学方法监测了肝移植动物模型中外周Treg的动态变化。开始类固醇治疗后，尤其是在停药组，外周Treg谱发生了显著变化，这些变化与免疫平衡的恢复密切相关。对热力学数据的实时监测显示，在细胞热模型中，外周Treg活性显示出特定的温度依赖性。细胞热模型与细胞内热力学实时监测相结合，为评估肝移植后停用类固醇的外周调节性T细胞概况的可行性提供了一个新的视角。加强对外周Treg谱的动态监测为制定个性化免疫抑制策略提供了重要依据，并能提高肝移植患者的治疗效果和生活质量。

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引用次数: 0

Experimental investigation of heat transfer augmentation of impinging jet solar air heater with stepped transverse ribs 带有阶梯式横向肋条的冲击喷射式太阳能空气加热器传热增效实验研究

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-29 DOI: 10.1016/j.tsep.2024.103020

Chinmaya Mund, Sushil Kumar Rathore, Ranjit Kumar Sahoo

The current experimental investigation analyses the thermal and frictional attributes of an impinging jet solar air heater (IJSAH) with stepped transverse ribs, having varying pitch and size, affixed to the absorber plate. Two ribs of dimension 2 × 4 (R1) and 4 × 6 cm (R2) were tested. The pitch (p) between ribs was 2, 4, and 8 cm, with Reynolds number (Re) varying from 4913 to 13103. The jet hole diameter (Dj) considered were 3, 6 and 9 mm. The maximum Nusselt number (Nu) with the recommended R1 rib having p = 4 cm and Dj = 3 and 6 mm equalled 128.784 and 104.5004 at Re = 13103, respectively, which was 31.22 and 21.76 % higher than that generated by smooth IJSAH. The friction factor (f) generated by the ribbed IJSAH having Dj = 6 mm and p = 4 cm was 57.08 % lower than ribbed IJSAH with Dj = 3 mm. The peak thermohydraulic performance parameter (THPP) achieved was for R1 rib with p = 4 cm and Dj = 6 mm and equalled 1.75, which was 19.49 % higher than smooth IJSAH. The R1 rib with p = 4 cm at Re = 11465 demonstrated better thermal characteristics based on detailed investigation.

目前的实验研究分析了带有阶梯式横向肋条的冲击喷射式太阳能空气加热器（IJSAH）的热属性和摩擦属性，这些肋条的间距和尺寸各不相同，并固定在吸收板上。测试了尺寸为 2 × 4（R1）和 4 × 6 厘米（R2）的两根肋条。肋条间距（p）分别为 2、4 和 8 厘米，雷诺数（Re）从 4913 到 13103 不等。喷射孔直径 (Dj) 分别为 3、6 和 9 毫米。在雷诺数为 13103 时，推荐的 R1 肋条（p = 4 厘米，Dj = 3 和 6 毫米）的最大努塞尔特数（Nu）分别为 128.784 和 104.5004，比光滑 IJSAH 产生的努塞尔特数分别高 31.22 和 21.76%。Dj = 6 毫米、p = 4 厘米的带肋 IJSAH 产生的摩擦因数（f）比 Dj = 3 毫米的带肋 IJSAH 低 57.08 %。P = 4 厘米、Dj = 6 毫米的 R1 肋的热液压性能参数（THPP）峰值为 1.75，比光滑的 IJSAH 高 19.49 %。根据详细调查，在 Re = 11465 条件下，p = 4 厘米的 R1 肋具有更好的热特性。

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引用次数: 0

Study on the acoustic disturbance characteristics of the spray flame 喷射火焰的声学干扰特性研究

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-28 DOI: 10.1016/j.tsep.2024.103016

Dongliang Wei, Hao Fang, Hao Zhou

The axial sound field was added to the ethanol spray flame as a perturbation element to study the dynamic response and combustion characteristics. A forced acoustic field is applied to a small oscillating flame. In cases where the frequency of the external sound field matches the eigenfrequency, even small amplitude self-excited flames demonstrate significant instability. As the intensity of the sound field increases, the amplitude of pressure oscillations sharply rises, and the pressure and flame heat release oscillations are in-phase. When the sound field operates at frequencies other than the eigenfrequency, it has an inhibitory effect on the evaporation and combustion process of ethanol droplets. Consequently, intensifying the sound field leads to a reduction in both the area of the evaporation combustion zone and the axial temperature of the flame. The CO formation is influenced by both temperature and the sound field, showing a pattern of increasing and then decreasing with the increase of sound intensity. Additionally, NOx generation exhibits higher emission concentrations in low-temperature and short flames, which is more likely to prompt NOx and is not closely related to frequency.

为研究动态响应和燃烧特性，在乙醇喷射火焰中加入了轴向声场作为扰动元素。在小型振荡火焰上施加了强制声场。在外部声场频率与特征频率相匹配的情况下，即使是小振幅自激火焰也会表现出明显的不稳定性。随着声场强度的增加，压力振荡的振幅急剧上升，压力和火焰放热振荡同相。当声场工作在特征频率以外的频率时，会对乙醇液滴的蒸发和燃烧过程产生抑制作用。因此，声场的增强会导致蒸发燃烧区面积和火焰轴向温度的降低。一氧化碳的形成受温度和声场的影响，随着声强的增加呈现先增加后减少的模式。此外，氮氧化物的生成在低温和短火焰中表现出更高的排放浓度，这更有可能催生氮氧化物，且与频率关系不大。

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引用次数: 0

Investigation of laminar flow and heat transfer performance of Gallium alloy based nanofluids in minichannel heat sink 微型通道散热器中镓合金基纳米流体的层流和传热性能研究

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-24 DOI: 10.1016/j.tsep.2024.103000

Adeel Muhammad , Usman Allauddin , Alfredo Iranzo

In this research, 3-D numerical analysis is carried out for single-phase laminar flow in a minichannel heat sink subjected to a uniform value of heat flux. The influence of various substrate materials (Aluminum nitride AlN, Copper alloy Cu, and Silicon Si) and different working fluids GaIn, GaIn-based nanofluids (GaIn-6 %CNT, GaIn-6 %Diamond, GaIn-6 %Alumina) and water on the maximum heat flux, pumping power, average heat transfer coefficient, total thermal resistance and pressure loss is examined for Reynolds number (Re = 300 − 1900) inside minichannel. It is noted that the substrate’s conductivity substantially influences the heat transfer coefficient of minichannel, with higher conductivity leading to a higher heat transfer coefficient. Besides, among all the coolants, the GaIn-6 %CNT alloy with superior thermal conductivity shows an enhanced heat transfer coefficient compared to other coolants in this study. Simulations results depict that the average heat transfer coefficient (h) of GaIn-6 %CNT, GaIn-6 %Diam, and GaIn-6 %Al₂O₃ relative to that of GaIn alloy is increased by 8.40 %, 7.63 %, and 0.22 %, respectively for Cu substrate at φ = 6 % and Re = 1900. Moreover, for GaIn-6 %CNT, which is used as a liquid metal nanofluid, and Cu is replaced with Si substrate, (h) increases by 35 % and 62.5 % at Re = 1900 and Re = 300, respectively. Similarly, when Cu is used to replace AlN, (h) increases by 11 % and 18.20 % for Re = 1900 and Re = 300, respectively. Finally, numerical findings of the pressure loss and pumping power for working fluids employed in minichannel are discussed and compared with the calculations obtained by analytical correlations.

本研究针对热通量值均匀的微型通道散热器中的单相层流进行了三维数值分析。在雷诺数（Re = 300 - 1900）条件下，研究了不同基底材料（氮化铝 AlN、铜合金 Cu 和硅 Si）和不同工作流体 GaIn、GaIn 基纳米流体（GaIn-6 %CNT、GaIn-6 %金刚石、GaIn-6 %氧化铝）以及水对微型通道内最大热通量、泵功率、平均传热系数、总热阻和压力损失的影响。结果表明，基质的电导率对微型通道的传热系数有很大影响，电导率越高，传热系数越大。此外，在所有冷却剂中，GaIn-6 %CNT 合金具有更高的热传导率，与本研究中的其他冷却剂相比，其热传导系数更高。模拟结果表明，在 φ = 6 % 和 Re = 1900 条件下，对于铜基板，GaIn-6 %CNT、GaIn-6 %Diam 和 GaIn-6 %Al2O3 的平均传热系数（h）相对于 GaIn 合金分别提高了 8.40 %、7.63 % 和 0.22 %。此外，对于用作液态金属纳米流体的 GaIn-6 %CNT，如果用硅衬底代替铜，则在 Re = 1900 和 Re = 300 时，(h) 分别增加 35 % 和 62.5 %。同样，当用 Cu 替代 AlN 时，在 Re = 1900 和 Re = 300 条件下，(h) 分别增加了 11 % 和 18.20 %。最后，讨论了微型通道中使用的工作流体的压力损失和泵送功率的数值结果，并将其与分析相关计算结果进行了比较。

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引用次数: 0

Experimental investigation on the design of a three-phase power factor corrector utilizing a SEPIC converter 利用 SEPIC 转换器设计三相功率因数校正器的实验研究

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-20 DOI: 10.1016/j.tsep.2024.102951

Jitha Varghese, T. Anuradha

A new configuration for a three-phase electric vehicle (EV) charger based on the Single-Ended Primary Inductor Converter (SEPIC) topology. The proposed charger operates as a power factor correction (PFC) converter, offering both step-up (boost) and step-down (buck) functions, enabling efficient adaptation to different input voltage levels while ensuring a stable DC output. By incorporating closed-loop current control and fast-switching regulation, the system attains unity power factor, which helps to reduce power losses and improve overall power quality. A unique control technique is proposed to regulate input current under unbalanced voltage conditions, ensuring reliable operation and high efficiency even during grid fluctuations. Simulations using MATLAB/Simulink demonstrate that, in unbalanced voltage scenarios, the control method maintain stable input current shaping, highlighting the system’s resilience. The results validate the SEPIC-based EV charger’s ability to consistently deliver efficient charging performance in both balanced and unbalanced voltage conditions, while achieving unity power factor and stable voltage regulation.

基于单端初级电感器转换器（SEPIC）拓扑结构的三相电动汽车（EV）充电器的新配置。拟议的充电器作为功率因数校正（PFC）转换器运行，同时具有升压（升压）和降压（降压）功能，能够有效适应不同的输入电压水平，同时确保稳定的直流输出。通过采用闭环电流控制和快速开关调节，该系统可达到统一功率因数，从而有助于减少功率损耗并提高整体电能质量。该系统提出了一种独特的控制技术，可在不平衡电压条件下调节输入电流，从而确保即使在电网波动时也能可靠运行并实现高效率。使用 MATLAB/Simulink 进行的仿真表明，在不平衡电压情况下，该控制方法能保持稳定的输入电流整形，突出了系统的弹性。结果验证了基于 SEPIC 的电动汽车充电器能够在平衡和不平衡电压条件下持续提供高效的充电性能，同时实现统一功率因数和稳定的电压调节。

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引用次数: 0

Vat photopolymerization for thermal energy storage applications using encapsulated phase change material suspended in photocurable resin 使用悬浮在光固化树脂中的封装相变材料进行热能储存应用的罐式光聚合反应

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-18 DOI: 10.1016/j.tsep.2024.102986

Isabel Melendez, Karl B. Morgan, Casey J. Troxler, Rafael M. Rodriguez, Sandra K.S. Boetcher

A novel approach to additively manufacture latent heat thermal energy storage heat exchangers through the development of microencapsulated phase change material (MEPCM) suspensions in photocurable resin for vat photopolymerization (VPP) 3D printing is presented. Using MEPCM addresses the leakage risks that have typically been associated with PCMs and subsequently makes the particulates a suitable additive for VPP 3D printing. In the current study, VPP was employed to fabricate functional composites with varying MEPCM mass fractions for thermal, rheological, microstructure, and chemical characterization. Microstructure visualization was conducted to assess the overall distribution of MEPCM within the 3D printed samples and to confirm the structural integrity of the encapsulated particles after printing. The influence of the base resin viscosity was explored by investigating two photocurable resins with different viscosities—a high-tensile UV photopolymer and an ABS-like resin—during the printing process. Thermal properties, such as latent heat of fusion, phase-change temperature, thermal conductivity, and decomposition temperature of the 3D printed samples were determined. Rheology was used to observe the effect of varying shear rates on the MEPCM-resin mixtures to identify the optimal viscoelastic properties for VPP 3D printing. It was determined that the ABS-like resin was able to contain a larger amount of PCM (40 wt%) while maintaining printability due to the lower viscosity of the corresponding pure resin. The 40 wt% MEPCM composite exhibited an average viscosity of 18,817 cPs, a maximum latent heat of fusion of 54.12 kJ/kg, and a 12.4% reduction in thermal conductivity compared to the pure polymer.

本文介绍了一种通过开发用于大桶光聚合（VPP）三维打印的光固化树脂中的微胶囊相变材料（MEPCM）悬浮液来添加制造潜热热能储存热交换器的新方法。使用 MEPCM 解决了通常与 PCM 相关的泄漏风险，从而使微粒成为 VPP 3D 打印的合适添加剂。在当前的研究中，采用 VPP 制备了具有不同 MEPCM 质量分数的功能复合材料，并对其进行了热学、流变学、微观结构和化学表征。微观结构可视化可用于评估 MEPCM 在三维打印样品中的总体分布情况，并确认打印后封装颗粒的结构完整性。在打印过程中，通过研究两种具有不同粘度的光固化树脂--一种高强度 UV 光聚合物和一种类似 ABS 的树脂--来探索基础树脂粘度的影响。测定了三维打印样品的热性能，如熔融潜热、相变温度、热导率和分解温度。流变学用于观察不同剪切速率对 MEPCM 树脂混合物的影响，以确定 VPP 3D 打印的最佳粘弹性能。结果表明，由于相应纯树脂的粘度较低，类 ABS 树脂能够含有较多的 PCM（40 wt%），同时保持可打印性。与纯聚合物相比，40 wt% MEPCM 复合材料的平均粘度为 18,817 cPs，最大熔融潜热为 54.12 kJ/kg，热导率降低了 12.4%。

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引用次数: 0

Assessment of thermofluidic behaviour of a Medium-High-Temperature shell and tube latent heat storage through experimental and computational investigation 通过实验和计算研究评估中高温管壳式潜热蓄热器的热流体特性

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-09 DOI: 10.1016/j.tsep.2024.102969

Alok K. Ray , Dibakar Rakshit , K. Ravi Kumar , Hal Gurgenci

The study envisages a holistic experimental methodology encompassing the entire spectrum of formulation, characterization, and thermal response evaluation of a medium–high-temperature (MHT) phase change material (PCM). The heating rate in melting is significantly less than the cooling rate during solidification until PCM reaches phase transition temperature. For q“ = 1000 W/m², charging duration of vertical domain (θ = 90°) is 15 % slower than horizontal domain (θ = 0°). However, with increase in flux to 2000 W/m² the charging duration is only 6 % slower for θ = 90° than θ = 0°. Melting/charging duration for thermocouple positioned at A (r = 18 mm, top side of prototype) is 15.38 % lower than at F (r = 18 mm, bottom side of prototype) and positioned at C (r = 38 mm, top side) is 8 % lower than at D (r = 38 mm, bottom side) for horizontally orientated LHTES system. A substantial decrease (by 17.64 %) in discharging duration was observed with increase in the inlet flow rate and the inlet temperature by 2.5 times and 3.3 times, respectively. The total energy accumulated in the LHTES demonstrates an approximately 11 % increase with the escalation of electric flux from 1000 W/m² to 2000 W/m² during the charging process for θ = 0° orientation. In contrast to charging, faster solidification rate is observed in the bottom half of the prototype (points D, E, F) compared to the top half (points A, B, C) which has implications for the design and operation of LHTES systems.

本研究采用了一种整体实验方法，涵盖了中高温（MHT）相变材料（PCM）的配方、表征和热响应评估的整个过程。在 PCM 达到相变温度之前，熔化过程中的加热速率明显低于凝固过程中的冷却速率。q" = 1000 W/m2 时，垂直域（θ = 90°）的充电持续时间比水平域（θ = 0°）慢 15%。然而，当通量增加到 2000 W/m2 时，θ = 90° 的充电持续时间只比θ = 0° 慢 6%。对于水平方向的 LHTES 系统，位于 A 处（r = 18 毫米，原型机顶部）的热电偶的熔化/充电持续时间比位于 F 处（r = 18 毫米，原型机底部）的热电偶的熔化/充电持续时间短 15.38%，位于 C 处（r = 38 毫米，原型机顶部）的热电偶的熔化/充电持续时间比位于 D 处（r = 38 毫米，原型机底部）的热电偶的熔化/充电持续时间短 8%。入口流速和入口温度分别提高 2.5 倍和 3.3 倍后，放电持续时间大幅缩短（17.64%）。在 θ = 0° 方向的充电过程中，随着电通量从 1000 W/m2 增加到 2000 W/m2，LHTES 中积累的总能量增加了约 11%。与充电相反，原型的下半部分（D、E、F 点）与上半部分（A、B、C 点）相比，凝固速度更快，这对 LHTES 系统的设计和运行具有重要意义。

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引用次数: 0

Material-level experimental study on utilising ionic liquid/graphene composites for sorption heat storage 利用离子液体/石墨烯复合材料进行吸附蓄热的材料级实验研究

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-01 DOI: 10.1016/j.tsep.2024.102955

Ahmed Rezk , Zoran Visak , Tahmid Hasan Rupam , James Hammerton , Qingchun Yuan , Matthew J. Derry , Bidyut Baran Saha

Sorption heat storage technology has recently sparked an increasing interest because of its advanced heat storage capabilities. However, material-level heat and mass transfer challenges persist. This work contributes to the field by the development of new sorption composite materials that are comprised ionic liquids (1-ethyl-3-methylimidazolium methanesulfonate and 1-ethyl-3-methylimidazolium chloride) impregnated in 1–5 2D-layered graphene host matrix. Their sorption, heat transfer, heat storage, and charging/discharging rate properties were experimentally investigated using both water and ethanol as adsorbates. The adsorption isotherms and kinetics for both the adsorbates onto the developed composites and the parent ionic liquids were experimentally measured at different temperatures. The isosteric heat of adsorption for all the studied pairs was determined using the Clausius-Clapeyron method, showing an increasing trend with an increasing uptake. They showed that the specific heat storage capacity reached 187.5 kJ/kg when water was used as the working sorption agent. The corresponding heat charging/discharging rates are significantly higher, 69 %-78 %, than pure ionic liquids. Compared to silica gel as a baseline sorbent, ionic liquid-graphene composites’ heat storage and transfer capacities are higher by three orders of magnitude. The thermal diffusivities of the developed composites were significantly higher than the baseline silica gel. These innovative sorption composites show great potential for improving thermal energy storage efficiency, making them suitable for applications in renewable energy systems, industrial processes, waste heat recovery, and climate control solutions. However, the developed composites achieved inferior performance compared to the silica gel baseline sorbent when using ethanol as a working fluid to utilise sub-zero ambient air as a heat source because of the relatively larger molecular size of ethanol.

吸附蓄热技术因其先进的蓄热能力，最近引发了越来越多的关注。然而，材料层面的传热和传质难题依然存在。这项研究开发了新型吸附复合材料，将离子液体（1-乙基-3-甲基咪唑鎓甲烷磺酸盐和 1-乙基-3-甲基咪唑鎓氯化物）浸渍在 1-5 层二维石墨烯主基体中，为该领域做出了贡献。以水和乙醇为吸附剂，对它们的吸附、传热、蓄热和充放电速率特性进行了实验研究。在不同温度下，实验测量了吸附剂在所开发的复合材料和母离子液体上的吸附等温线和动力学。使用克劳修斯-克拉皮隆法测定了所有研究对的等效吸附热，结果表明随着吸附量的增加，等效吸附热呈上升趋势。研究结果表明，当使用水作为工作吸附剂时，比热存储容量达到 187.5 kJ/kg。与纯离子液体相比，相应的热充放电率明显较高，为 69 %-78 %。与作为基准吸附剂的硅胶相比，离子液体-石墨烯复合材料的蓄热和传热能力高出三个数量级。开发的复合材料的热扩散率明显高于基准硅胶。这些创新型吸附复合材料在提高热能存储效率方面显示出巨大潜力，使其适合应用于可再生能源系统、工业流程、废热回收和气候控制解决方案。然而，与硅胶基线吸附剂相比，所开发的复合材料在使用乙醇作为工作流体以利用零度以下的环境空气作为热源时性能较差，这是因为乙醇的分子相对较大。

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引用次数: 0

Effect of wheat bran filler particulates nettle fiber reinforced epoxy matrix composite − A novel material for thermal insulation application 麦麸填料微粒对荨麻纤维增强环氧基复合材料的影响--一种用于隔热应用的新型材料

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2024-10-01 DOI: 10.1016/j.tsep.2024.102917

Chenyoushi Xu , Manzoore Elahi M. Soudagar , Pradeep Kumar Singh , Muhammad Nasir Bashir , Joon Sang Lee , Mohammad Rezaul Karim , Asiful H. Seikh

This research examines the mechanical and thermal characteristics of composites made from nettle fiber-reinforced wheat bran filler particulate epoxy framework. It highlights the influence of different filler materials on the performance of these composites. A thorough examination of mechanical properties was carried out, focusing on the flexibility, bending strength, impact resistance, and Shore D hardness. The malleable quality was completely changed by adding a filler ingredient, reaching a peak of 51.36 MPa. The flexural strength reached 47.38 MPa, showing excellent ability to withstand loads. The assessment of affect quality reached a maximum of 13 kJ/m2, indicating high energy absorption and durability. The Shore D hardness, which indicates the surface’s ability to resist indentation, ranged from 52 to 61, indicating differences in the stiffness of the composite material. The addition of bran filler to this composite provides an ideal thermal conductivity value of 0.98 W/mK. The morphological properties of the composites were analysed using Scanning Electron Microscopy (SEM), which provided detailed insights into their internal structure. The SEM images revealed a uniform distribution of nettle filaments and bran fillers inside the epoxy matrix, with well-formed samples exhibiting strong fiber–matrix adhesion and minimal voids.

本研究探讨了由荨麻纤维增强麦麸填料颗粒环氧框架制成的复合材料的机械和热特性。研究强调了不同填充材料对这些复合材料性能的影响。研究对机械性能进行了全面检测，重点是柔韧性、弯曲强度、抗冲击性和邵氏 D 硬度。添加填料成分后，可塑性质量完全改变，达到了 51.36 兆帕的峰值。抗弯强度达到了 47.38 兆帕，显示出卓越的承载能力。抗冲击质量的评估结果达到了 13 kJ/m2 的最大值，表明具有较高的能量吸收能力和耐久性。邵氏 D 硬度（表示表面的抗压痕能力）从 52 到 61 不等，表明复合材料的硬度存在差异。在这种复合材料中加入麸皮填料后，理想的导热值为 0.98 W/mK。使用扫描电子显微镜（SEM）分析了复合材料的形态特性，详细了解了其内部结构。扫描电子显微镜图像显示，荨麻丝和糠麸填料在环氧树脂基体中分布均匀，成型良好的样品显示出很强的纤维与基体粘附性，空隙极小。

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