Thermal Science and Engineering Progress最新文献

Numerical simulation and study of flow and heat transfer performance of direct contact heat exchanger based on sinusoidal alternating magnetic field 基于正弦交变磁场的直接接触式换热器流动传热性能的数值模拟与研究

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104519

Jiarui Xu , Jinhe Li , Yanhua Ma , Wentao Hu , Weida Zeng , Hao Zhang , Junwei Huang

Alternating magnetic fields of various frequencies and intensities were employed in this investigation to enhance the efficiency of the direct contact heat exchanger (DCHE). To explore how magnetic field intensity and frequency affect flow behavior and heat transfer performance, the volume of fluid method combined with the MHD model was used. During heat transfer, the effects of various magnetic fields on the vortex structure, turbulent kinetic energy, and volume heat transfer coefficient (VHTC) were analyzed. Results indicate that low-frequency magnetic fields promote the formation of small-scale vortices, enhancing local turbulence and heat transfer efficiency. In contrast, high-frequency fields tend to generate large-scale vortices, but excessive field intensity may suppress local mixing. Both vortex formation and turbulence enhancement significantly improve heat transfer, leading to notable increases in VHTC. A multivariate regression model was developed to describe the relationship between VHTC, magnetic field intensity, and frequency, with variance analysis confirming its predictive reliability. Under Case VII conditions (1T, 10 Hz), the heat exchanger achieved optimal performance, with turbulent kinetic energy increasing by 57.3 %, outlet temperature rising by 3.76°C, and VHTC improving by 5.779 W/m³·K, relative to the case without magnetic field application.

采用不同频率和强度的交变磁场来提高直接接触式换热器（DCHE）的效率。为了探究磁场强度和频率对流动行为和换热性能的影响，采用流体体积法结合MHD模型。在换热过程中，分析了不同磁场对涡流结构、湍流动能和体积换热系数的影响。结果表明，低频磁场促进了小尺度涡的形成，增强了局部湍流度和换热效率。相反，高频场容易产生大尺度涡旋，但过大的场强可能抑制局部混合。涡的形成和湍流的增强都显著改善了换热，导致VHTC显著增加。建立了VHTC与磁场强度、频率关系的多元回归模型，方差分析证实了该模型的预测可靠性。在工况VII条件下（1T, 10hz），换热器性能达到最佳，与不加磁场工况相比，湍流动能提高57.3%，出口温度提高3.76℃，VHTC提高5.779 W/m3·K。

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引用次数: 0

Techno-economic assessment of a concentrating solar air heater and packed-bed thermal energy storage for medium-temperature industrial process heat 用于中温工业过程热的聚光太阳能空气加热器和填充床蓄热技术经济评价

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104529

Antonio Famiglietti , Ignacio Calderón-Vásquez , José Miguel Cardemil , Ian Wolde , Ruben Abbas

Among the solar thermal technologies, the Linear Fresnel collector can provide solar heat for industrial processes in the medium temperature range of 150–400 °C. Hot air is widely used as a process medium in several industrial processes, such as drying, curing, and cooking. Although steam, pressurized water, and thermal oil are widely used heat transfer fluids in the solar field, the use of air appears as an interesting alternative; it reduces installation costs as well as the risks associated with leakages, and it enables a direct coupling with the air-based thermal processes. This work proposes an innovative layout using Linear Fresnel collectors for direct solar air heating up to 350 °C in an open-to-atmosphere circuit, avoiding liquid heat transfer fluid in the solar field and heat exchangers. A packed-bed thermal energy storage using copper slags as the filler material is coupled with the concentrating solar air heater to increase the solar fraction to the medium- temperature industrial process. A comprehensive techno-economic analysis is carried out to assess the viability of the proposed concept, establishing the design methodology and operation strategy for improving economic performance. The solar system of 360 kW peak thermal power is integrated on an air-based industrial process having a natural gas burner as the conventional heat source, considering four different demand profiles. A methodology for optimizing the packed-bed size is implemented. A levelized heat cost between

50 - 60 € / M W h

is achieved by the combined system. Besides, the demand profiles 24/7 and 10/5 are found to have the highest potential to integrate the proposed system, enabling high solar fraction up to 0.6 with limited cost increase.

在太阳能热技术中，线性菲涅耳集热器可以在150-400°C的中温范围内为工业过程提供太阳能热。热风作为一种工艺介质广泛应用于许多工业过程中，如干燥、固化和烹饪。虽然蒸汽、加压水和导热油是太阳能领域广泛使用的传热流体，但空气的使用似乎是一种有趣的替代方案；它降低了安装成本以及与泄漏相关的风险，并实现了与空气热过程的直接耦合。这项工作提出了一种创新的布局，使用线性菲涅耳集热器在开放式大气回路中直接加热高达350°C的太阳能空气，避免了太阳能场和热交换器中的液体传热流体。以铜渣为填料的填充床蓄热装置与聚光太阳能空气加热器相结合，提高了中温工业过程的太阳能利用率。进行了全面的技术经济分析，以评估拟议概念的可行性，建立设计方法和操作策略，以提高经济绩效。考虑到四种不同的需求概况，360千瓦峰值热功率的太阳能系统集成在以天然气燃烧器为传统热源的空气工业过程中。实现了一种优化填料床尺寸的方法。通过联合系统，平均热成本在50-60欧元/兆瓦时之间。此外，24/7和10/5的需求曲线被发现具有整合拟议系统的最大潜力，在有限的成本增加下实现高达0.6的高太阳能比例。

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引用次数: 0

Experimental investigation of energy, exergy, and economic performance of a solar still with hollow cement fins and carbon-enhanced PCM for clean water production 具有中空水泥翅片和碳增强PCM的清洁水生产太阳能蒸馏器的能源、能源和经济性能的实验研究

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104539

Vishwanath Kumar , Mridupavan Gogoi , Biplab Das , Rajat Gupta

Freshwater scarcity is a growing global concern, especially in remote and arid regions where access to clean water is limited. Solar stills offer a simple and sustainable desalination approach, but their low productivity restricts widespread application. To address this gap, the present study aims to enhance solar still performance by integrating hollow cylindrical cement fins and composite phase change materials (PCMs) enriched with carbon particles. Five modified solar stills (MSS) are evaluated: a solar still with empty fins (MSS-1); a solar still with fins filled with pure paraffin wax (MSS-2); and three solar stills with fins containing paraffin wax mixed with 1%, 2%, and 3% carbon particles, designated as MSS-3, MSS-4, and MSS-5, respectively. Their productivity and performance are compared with the conventional slope solar still (CSS). Experiments are conducted in Silchar, India (24.82°N, 92.79°E). The performance is assessed in terms of freshwater yield, energy and exergy efficiency, cost per liter, and payback period. MSS-5 shows the greatest improvement, achieving 5.1 L/m²/day productivity, 48.7% energy efficiency, 4.2% exergy efficiency, and the lowest cost per liter of $0.0112 with a 124-day payback period. Compared to CSS, freshwater productivity increases by 27.8%, 51.8%, 67.5%, 76.8%, and 88.6% for MSS-1 to MSS-5, respectively. The use of 3 wt% carbon particles enhances the thermal conductivity of the PCM, resulting in better heat storage and higher system performance. The findings indicate that combining cement fins with carbon-enhanced PCM effectively improves solar still performance, providing a viable and cost-efficient approach for freshwater production.

淡水短缺日益成为全球关注的问题，特别是在获得清洁水的机会有限的偏远和干旱地区。太阳能蒸馏器提供了一种简单而可持续的海水淡化方法，但其低生产率限制了其广泛应用。为了解决这一问题，本研究旨在通过将空心圆柱形水泥翅片和富含碳颗粒的复合相变材料（PCMs）集成在一起来提高太阳能静止器的性能。对五种改进型太阳能蒸馏器（MSS）进行了评价：空翅片太阳能蒸馏器（MSS-1）；太阳能蒸馏器，其翅片充满纯石蜡（MSS-2）；以及三个太阳能蒸馏器，其翅片含有石蜡，混合了1%，2%和3%的碳颗粒，分别命名为MSS-3， MSS-4和MSS-5。并与传统的斜面太阳能蒸馏器（CSS）进行了生产率和性能比较。实验在印度Silchar（24.82°N, 92.79°E）进行。评价指标包括淡水产量、能源和能源效率、每升成本和投资回收期。MSS-5表现出最大的改善，达到5.1 L/m2/天的生产率，48.7%的能源效率，4.2%的能源效率，每升最低成本为0.0112美元，投资回收期为124天。与CSS相比，MSS-1至MSS-5的淡水生产力分别提高了27.8%、51.8%、67.5%、76.8%和88.6%。使用3 wt%的碳颗粒增强了PCM的导热性，从而获得更好的储热性能和更高的系统性能。研究结果表明，将水泥翅片与碳增强型PCM相结合，有效提高了太阳能蒸馏器的性能，为淡水生产提供了可行且经济高效的方法。

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引用次数: 0

Experimental investigation on heat transfer characteristics between supercritical mixtures (H2O/CO2 and H2O/CO2/H2) and supercritical water in double pipe heat exchanger 双管换热器中超临界混合物（H2O/CO2和H2O/CO2/H2）与超临界水换热特性的实验研究

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104528

Tete Gui, Kangsen Chen, Jiasunle Li, Zhiwei Ge, Liejin Guo

The supercritical mixtures (H₂O/CO₂ and H₂O/CO₂/H₂) are generated in the poly-generation system based on the supercritical water gasification (SCWG) of coal, which is a promising and valuable approach of clean utilization of coal. Exploring the heat transfer characteristics between supercritical mixtures (SCM) and supercritical water (SCW) in a double pipe heat exchanger (DPHE) is essential to design and apply efficient heat exchangers. Nowadays, the understanding of the heat transfer mechanism and characteristics between SCM and SCW is still inadequate and absent, and there are no experimental researches and platforms that achieve the heat exchange. In this paper, the experimental system with two-separate opened loops was designed and constructed, which could realize the heat transfer between SCM in shell and SCW in tube with different mass flow rate. Different influencing factors including the bulk temperature, mass flow rate and mass fraction of CO₂ and H₂ were investigated in details. Increasing the mass flow rate of SCW in tube has almost no effect on the total heat transfer coefficient (HTC) for both H₂O/CO₂/H₂ and H₂O/CO₂. However, the result of total HTC for changing that of shell is reverse, the total heat transfer coefficient (HTC) increased with the increasing of the mass flow rate of SCW in shell. The peak value of total HTC for H₂O/CO₂ mixtures increases from 330.41 W·m⁻²·K⁻¹ to 365.42 W·m⁻²·K⁻¹ and 406.32 W·m⁻²·K⁻¹ while the mass fractions of CO₂ decrease from 19.21 % to 11.53 % and 9.51 %. Two novel heat transfer correlation for both H₂O/CO₂/H₂ and H₂O/CO₂ mixtures were firstly proposed.

煤的超临界水气化（SCWG）在多联产系统中产生H2O/CO2和H2O/CO2/H2的超临界混合物，是一种有前途和有价值的煤炭清洁利用方法。研究双管换热器中超临界混合物（SCM）与超临界水（SCW）之间的换热特性对高效换热器的设计和应用具有重要意义。目前，对SCM和SCW之间的换热机理和特性的认识还不充分和缺失，也没有实现其换热的实验研究和平台。本文设计并搭建了双独立开环实验系统，实现了壳内SCM与管内SCW在不同质量流量下的换热。考察了体积温度、质量流量、CO2和H2质量分数等因素对反应的影响。提高管内水的质量流量对H2O/CO2/H2和H2O/CO2的总换热系数（HTC）几乎没有影响。但总传热系数对壳层传热系数的影响与之相反，总传热系数随着壳层水质量流量的增大而增大。H2O/CO2混合物的总HTC峰值从330.41 W·m−2·K−1增加到365.42 W·m−2·K−1和406.32 W·m−2·K−1，而CO2的质量分数从19.21%下降到11.53%和9.51%。首次提出了H2O/CO2/H2和H2O/CO2混合物的两种新的传热关系式。

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引用次数: 0

Performance analysis and optimization of a dual-pressure organic Rankine cycle system with dual vapor–liquid separators coupled with an ejector 双气液分离器耦合喷射器双压力有机朗肯循环系统的性能分析与优化

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104515

Xinle Yang , Yannan Zhou , Shujuan Bu , Shengdong Lu , Zhenchao Yan

Driven by carbon-neutrality goals, efficient recovery of low-grade thermal energy has become increasingly important. This study develops a novel ejector-integrated dual-separator dual-pressure organic Rankine cycle (EJ-DS-DPORC), which couples ejector-based vapor upgrading with phase-quality control using dual separators. This configuration enhances fluid distribution and thermal matching between pressure stages, thereby addressing persistent issues in conventional ejector-assisted ORC systems, such as heat-source mismatch and uncontrolled vapor quality. A comprehensive thermodynamic model and multi-objective optimization are conducted considering net power, thermal efficiency, exergy efficiency, specific investment cost, and annual emission reduction. Under representative operating conditions (Rp ≈ 5.1, Er ≈ 0.84), the EJ-DS-DPORC achieves 342.9 kW net power, 13.4 % thermal efficiency, and 66.2 % exergy efficiency. Compared with the baseline DS-DPORC (312.4 kW, 12.7 %, 56.1 %), these correspond to improvements of 9.8 %, 1.7 %, and 10.1 %, along with a 4.8 % reduction in specific investment cost and a 10.6 % increase in annual greenhouse-gas reduction. The environmental benefit is evaluated under a life-cycle boundary that accounts for both electricity-generation displacement and embodied emissions of major system components. Overall, the EJ-DS-DPORC demonstrates notable energy, economic, and environmental advantages, highlighting its strong potential for high-efficiency recovery of low-grade heat. Nevertheless, the coordinated control of fluid distribution between the two pressure levels and the stable operation of the ejector introduce additional system complexity, implying that careful design of control strategies and operational safeguards is necessary for practical implementation.

在碳中和目标的推动下，低品位热能的高效回收变得越来越重要。本研究开发了一种新型的喷射器-集成双分离器双压力有机朗肯循环（EJ-DS-DPORC），该循环将基于喷射器的蒸汽升级与使用双分离器的相质量控制相结合。这种配置增强了流体分布和压力级之间的热匹配，从而解决了传统喷射器辅助ORC系统中存在的问题，例如热源不匹配和不受控制的蒸汽质量。综合考虑净功率、热效率、火用效率、比投资成本和年减排量，建立综合热力学模型，进行多目标优化。在典型工况（Rp≈5.1,Er≈0.84）下，EJ-DS-DPORC的净功率为342.9 kW，热效率为13.4%，火用效率为66.2%。与基线DS-DPORC （312.4 kW, 12.7%, 56.1%）相比，这些对应于9.8%，1.7%和10.1%的改进，以及4.8%的特定投资成本减少和10.6%的年度温室气体减少。环境效益是在考虑发电位移和主要系统组件的具体排放的生命周期边界下评估的。总体而言，EJ-DS-DPORC具有显著的能源、经济和环境优势，突出了其高效回收低品位热量的强大潜力。然而，两个压力水平之间流体分布的协调控制和喷射器的稳定运行会带来额外的系统复杂性，这意味着在实际实施中需要仔细设计控制策略和操作保障措施。

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引用次数: 0

An experimental study on the thermal performance of a packed-bed glass tube operated in the direct absorption solar heating 直接吸收式太阳能加热中填充床玻璃管热性能的实验研究

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104517

Seyed Mohammad Sadegh Hosseini , Omid Kordestani , Mohammad Shafiey Dehaj

Improving the thermal efficiency of solar collectors is one of the most significant advancements in the field of harvesting and converting solar energy. In this study, a packed-bed strategy was employed in a direct absorption solar collector to enhance thermal performance. The heating system consisted of a transparent glass tube filled with the stainless-steel scrubbers (coated black) as packing materials. The working fluid was circulated through the packed-bed under forced flow conditions while being exposed directly to solar radiation. Pure water and an optical nanofluid (Fe₂O₃(0.05%)/water nanofluid) were used as the working fluids. A 57% improvement in the maximum efficiency of water flow was achieved with the packed-bed collector compared to the empty collector. The packed-bed design increased the surface area exposed to sunlight, enabling more efficient trapping and absorption of solar radiation. Additionally, the heat loss parameter for the nanofluid flow in the packed-bed collector decreased by 28% relative to the empty collector, demonstrating improved thermal management and energy storage. The packed-bed collector exhibited only a 24% higher pressure drop than the empty collector. Overall, the packed-bed strategy proved to be an efficient, eco-friendly, and straightforward technique for scaling up the operational efficiency of DASCs.

提高太阳能集热器的热效率是太阳能收集和转换领域最重要的进展之一。在这项研究中，在直接吸收太阳能集热器中采用填充床策略来提高热性能。加热系统由一个透明的玻璃管组成，管内填充了不锈钢洗涤器（涂黑）作为包装材料。工作流体在强制流动条件下通过填充床循环，同时直接暴露在太阳辐射下。工作流体采用纯水和光学纳米流体（Fe2O3(0.05%)/水纳米流体）。与空收集器相比，填料床收集器的最大水流效率提高了57%。填充床的设计增加了暴露在阳光下的表面积，能够更有效地捕获和吸收太阳辐射。此外，纳米流体在填充床集热器中的热损失参数相对于空集热器降低了28%，表明热管理和能量储存得到了改善。填料床收集器的压降仅比空收集器高24%。总的来说，充填床策略被证明是一种高效、环保、直接的技术，可以提高dassc的作业效率。

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引用次数: 0

Effect of surface wettability in condenser section on the thermo-hydraulic performance of a single-loop pulsating heat pipe: experiment study 冷凝器段表面润湿性对单回路脉动热管热水力性能影响的实验研究

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104543

Wei Zhang, Kunyu Cheng, Haojie Chen

The study fabricated the tubular pulsating heat pipes (PHPs) with different surface wettability characteristics in the condenser section using the electrochemical anodization and copper-based self-assembly methods. The thermo-hydraulic characteristics of PHPs with different surface wettabilities (neutral, hydrophobic, super-hydrophilic, and hybrid surface) in the condenser section were experimentally investigated under different heating powers and liquid filling ratios. The results showed that at different heating powers, the PHPs can achieve the optimal heat transfer performance at 50% filling ratio. As the heating power increases, the thermal resistance shows a gradually decreasing tendency, and the liquid plug spreads more easily on the super-hydrophilic condensation surface, and the temperature fluctuation is smoother with a thermal resistance lower than that of neutral PHPs. The liquid plug in the hydrophobic condensation surface has less contact with the wall, and the evaporation section presents a higher temperature and the thermal resistance is higher than that of neutral PHP. The PHPs with hybrid surface wettability exhibits a high-frequency oscillation and has more efficient thermal performance than the super-hydrophilic condensation surface PHPs, with the minimum thermal resistance at 50% filling ratio and 32.04 W heating power.

采用电化学阳极氧化和铜基自组装的方法，在冷凝器段制备了具有不同表面润湿性的管状脉动热管。实验研究了具有不同表面润湿性（中性、疏水、超亲水性和杂化表面）的PHPs在不同加热功率和充液比下在冷凝器段的热水力特性。结果表明，在不同的加热功率下，填充率为50%时，PHPs的传热性能最优。随着加热功率的增大，热阻呈逐渐减小的趋势，液塞更容易在超亲水冷凝表面扩散，温度波动更平稳，热阻低于中性PHPs。疏水冷凝表面的液塞与壁面接触较少，蒸发段温度较高，热阻高于中性PHP。具有杂化表面润湿性的PHPs表现出高频振荡，其热阻在填充率为50%、加热功率为32.04 W时最小，热工性能优于超亲水性冷凝表面的PHPs。

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引用次数: 0

Experimental evaluation of low-GWP refrigerants as drop-in alternatives to R23 for ultra-low temperature refrigeration 低温制冷用低gwp制冷剂替代R23的实验评价

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104536

Pau Giménez-Prades, Joaquín Navarro-Esbrí, Cosmin-Mihai Udroiu, Ángel Barragán-Cervera, Adrián Mota-Babiloni

The transition towards low-GWP refrigerants in ultra-low temperature (ULT) refrigeration is hindered by the absence of regulatory frameworks. Thus, traditionally employed refrigerants, such as R23 or R508A, continue to dominate current usage despite their high GWP. This paper presents the first comprehensive experimental evaluation of two recently developed lower-GWP refrigerants, R469A (GWP = 1357) and R472B (GWP = 526), as drop-in alternatives to R23 (GWP = 14600) in an R404A/R23 commercial two-stage cascade ULT freezer. To simulate realistic and representative operating conditions of a typical ULT freezer, the investigation initially focused on the pull-down performance from ambient temperatures of 15, 20, and 25 °C to a target temperature of −70 °C. Subsequently, hysteresis operation with those ambient temperatures and set freezer temperatures of −70, −60 and −50 °C was examined. Results demonstrated that both R469A and R472B incurred longer pull-down durations (up to 60 and 47 min slower, respectively), along with increased energy consumption (up to 23% and 34% higher, respectively) compared to R23. As for the hysteresis operation, R469A and R472B performed better with higher freezer temperatures, reducing energy consumption by 10–17% at −50 °C and increasing it by 14–16% at −70 °C relative to R23. Regarding the environmental performance, the significantly lower GWP values of R469A and R472B translated into substantial reductions in overall CO₂ equivalent emissions, achieving up to a 50% decrease in environmental impact when compared to R23.

在超低温（ULT）制冷中向低gwp制冷剂的过渡受到缺乏监管框架的阻碍。因此，传统使用的制冷剂，如R23或R508A，尽管它们的全球升温潜能值很高，但仍继续主导当前的使用。本文介绍了两种最近开发的低GWP制冷剂R469A （GWP = 1357）和R472B （GWP = 526）作为R23 （GWP = 14600）在R404A/R23商用两级叶栅ULT制冷机中的直接替代品的首次综合实验评估。为了模拟典型ULT冷冻机的真实和具有代表性的操作条件，研究最初侧重于从环境温度15、20和25°C到目标温度- 70°C的下拉性能。随后，研究了环境温度和冷冻温度分别为- 70℃、- 60℃和- 50℃时的滞后运行情况。结果表明，与R23相比，R469A和R472B的下拉持续时间更长（分别慢了60分钟和47分钟），同时能量消耗增加（分别高出23%和34%）。对于迟滞操作，R469A和R472B在较高的冷冻温度下表现更好，相对于R23，在- 50℃时能耗降低10-17%，在- 70℃时能耗增加14-16%。在环境性能方面，R469A和R472B显著降低的GWP值转化为总体CO2当量排放量的大幅减少，与R23相比，对环境的影响减少了50%。

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引用次数: 0

Enhancing performance of latent heat thermal energy storage system through geometrical optimization of twisted heating dual-tubes 通过扭曲加热双管的几何优化提高潜热蓄热系统的性能

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104527

Naef A.A. Qasem , Abdeldjalil Belazreg , Aissa Abderrahmane , Obai Younis , Riadh Marzouki

Improving the efficiency of thermal systems is one of the most important challenges facing researchers and engineers. Introducing simple geometric modifications to thermal systems can significantly enhance performance. This study numerically assesses the performance of a vertical latent heat thermal energy storage (LHTES) system employing twisted inner tubes in a double-tube arrangement. Five twist angles (0°, 360°, 720°, 1080°, and 1440° on a 25 cm tube length) were evaluated to investigate their impact on phase transitions, temperature patterns, and thermal energy storage efficacy, utilizing n-octadecane as the phase change material (PCM) and water as the heat transfer fluid. Validated numerical modeling is performed using the enthalpy-porosity method for transient assessments of melting and solidification. The findings indicated that the twist structure significantly enhanced convective heat transfer in the LHTES, accelerating the phase transition and thermal activity. The 1080° twist structure exhibited superior performance, achieving 30.1% reduction in solidification time, 16.9% reduction in melting time, and 8.5% reduction in energy discharge time compared with the baseline straight tube. The findings of this study provide design visions for developing compact, high-efficiency LHTES systems in renewable energy applications.

提高热系统的效率是研究人员和工程师面临的最重要的挑战之一。对热系统进行简单的几何修改可以显著提高性能。本研究对采用双管结构的扭曲内管的垂直潜热储热系统的性能进行了数值评估。利用正十八烷作为相变材料（PCM），水作为传热流体，评估了五种扭转角度（0°、360°、720°、1080°和1440°，管子长度为25 cm）对相变、温度模式和热能储存效率的影响。利用焓孔法对熔融和凝固的瞬态评估进行了验证的数值模拟。结果表明，扭转结构显著增强了LHTES的对流换热，加速了相变和热活动。与基准直管相比，1080°扭转结构的凝固时间缩短了30.1%，熔化时间缩短了16.9%，能量放电时间缩短了8.5%。本研究的发现为开发可再生能源应用中紧凑、高效的LHTES系统提供了设计愿景。

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引用次数: 0

Initial thermal boundary layer impact on phase-field lattice Boltzmann method for simulating a single-bubble boiling 初始热边界层对模拟单泡沸腾的相场晶格玻尔兹曼方法的影响

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress

Pub Date : 2026-02-01 DOI: 10.1016/j.tsep.2026.104525

Ivan Talão Martins , Luben Cabezas-Gómez , Pablo Fariñas Alvariño

Usually, the phase-field lattice Boltzmann method (LBM) depends on an initial temperature profile or an initial small vapor nucleus for starting the nucleation process. However, there is no agreement on which initial thermal boundary layer (TBL) should be used in the LBM simulations. Thus, this work aims to study the impact of the TBL width on single bubble dynamics for phase-field LBM with phase-change. For this task, an Allen–Cahn-based lattice Boltzmann method (LBM) is employed in the simulation of a single bubble under pool boiling from a cavity. For the analysis, experimental results of a single bubble of saturated HFE7100 at 195 kPa under pool boiling are used as reference. Four different TBL widths are tested, and their impact on bubble dynamics is studied. Geometrical aspects and forces acting on the bubble are investigated. A thermal analysis regarding the heat transfer rates is also addressed. The results evidenced that the TBL width has a strong impact on bubble dynamics and can change the bubble period up to one order of magnitude in the simulations, changing the detachment diameter and the dynamic behavior of the bubble. Thus, evidencing the importance of choosing the correct (or most approximated) value of the TBL width.

通常，相场晶格玻尔兹曼方法（LBM）依赖于初始温度分布或初始小蒸汽核来启动成核过程。然而，对于在LBM模拟中应采用何种初始热边界层（TBL），目前还没有达成一致意见。因此，本文旨在研究相变相场LBM中TBL宽度对单泡动力学的影响。为此，采用基于allen - cahn的晶格玻尔兹曼方法（LBM）模拟了从空腔池中沸腾的单个气泡。本文以195 kPa饱和HFE7100在池沸条件下的单泡实验结果为参考。测试了四种不同的TBL宽度，并研究了它们对气泡动力学的影响。研究了气泡的几何形状和作用在气泡上的力。对传热速率的热分析也进行了讨论。结果表明，TBL宽度对气泡动力学有很大影响，可以改变气泡周期，改变气泡的分离直径和动力学行为，最大可达一个数量级。因此，证明选择正确的（或最接近的）TBL宽度值的重要性。

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