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Quantitative analysis of piping configuration effects on the hydraulic performance of the CAP1400 reactor coolant pump's core components via source term and modal decomposition methods 采用源项和模态分解方法定量分析了管道配置对CAP1400反应堆冷却剂泵核心部件水力性能的影响
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-02 DOI: 10.1016/j.energy.2026.140176
Zhenyang Guo , Xiaxia Xiang , Yeming Lu , Xiaofang Wang , Weijun Wang
{"title":"Quantitative analysis of piping configuration effects on the hydraulic performance of the CAP1400 reactor coolant pump's core components via source term and modal decomposition methods","authors":"Zhenyang Guo ,&nbsp;Xiaxia Xiang ,&nbsp;Yeming Lu ,&nbsp;Xiaofang Wang ,&nbsp;Weijun Wang","doi":"10.1016/j.energy.2026.140176","DOIUrl":"10.1016/j.energy.2026.140176","url":null,"abstract":"<div><div>The CAP1400 passive pressurized water reactor unit stands as the largest third-generation nuclear power facility of its kind developed in China. To elucidate the influence of piping and key equipment within the nuclear island's primary loop system on the operational characteristics of the CAP1400 reactor coolant pump (RCP), this research established a three-dimensional numerical simulation approach for the nuclear island's primary loop, based on the source term methodology. By introducing source terms and porous media models to simplify the steam generator and reactor pressure vessel, the computational bottleneck associated with simulating large-scale nuclear island full loops was effectively mitigated, thereby achieving a compromise between computational efficiency and precision. The study contrasted the hydraulic performance, pressure fluctuation, hydraulic excitation forces, entropy production distribution, and SPOD modal information of key RCP components under two operational scenarios: independent operation (RCP-I) and operation within the piping configuration system (RCP-C). The findings indicate that: (1) The simulation of the nuclear island primary-side full loop has been successfully implemented employing the source term and porous medium approach, yielding high accuracy and aligning well with experimental data. (2) Compared to the independent operation condition, the RCP within the piping configuration system exhibits a slight head increase of 0.21 m; however, its efficiency declines markedly by 2.64%, accompanied by an escalation in internal energy loss. (3) Entropy production analysis reveals that the significant increase in energy loss predominantly originates from the vane region and the inlet region, with augmentations of 77.0% and 55.4%, respectively. (4) Further examination of the SPOD modes indicates that the piping configuration prematurely induces flow separation at the impeller leading edge and exacerbates backflow in the vane outlet region, which constitutes the primary cause of the pump's overall performance deterioration and the rise in internal energy loss. This research is anticipated to offer technical support for the simulation and assessment of large-scale nuclear islands.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140176"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Upgraded utilization of biochar after heavy metal (Ni) adsorption for CO2 capture 重金属(Ni)吸附后生物炭对CO2捕获的升级利用
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-04 DOI: 10.1016/j.energy.2026.140326
Jialiang Dong , Ruikun Wang , Shiteng Tan , Zhenghui Zhao , Qianqian Yin , Jun Cheng , Xuehai Yu , Eric J. Hu , Fuyan Gao
{"title":"Upgraded utilization of biochar after heavy metal (Ni) adsorption for CO2 capture","authors":"Jialiang Dong ,&nbsp;Ruikun Wang ,&nbsp;Shiteng Tan ,&nbsp;Zhenghui Zhao ,&nbsp;Qianqian Yin ,&nbsp;Jun Cheng ,&nbsp;Xuehai Yu ,&nbsp;Eric J. Hu ,&nbsp;Fuyan Gao","doi":"10.1016/j.energy.2026.140326","DOIUrl":"10.1016/j.energy.2026.140326","url":null,"abstract":"<div><div>Biochar, with its well-developed pore structure and tunable surface chemistry, has been widely employed for heavy metal adsorption. However, the biochar after adsorption of heavy metals suffers from high risk of secondary pollution and difficulty in resource utilization. This study explores a feasible approach to converting it into an efficient CO<sub>2</sub> adsorbent. Heavy metal ions (represented by Ni<sup>2+</sup> in this study) are primarily captured via the mesoporous structure of biochar and can be stably anchored to the carbon skeleton after high temperature treatment. This process introduces alkali metal oxide sites on the biochar surface, which were confirmed as chemisorption centers for CO<sub>2</sub> by in situ near-ambient pressure X-ray photoelectron spectroscopy (in situ NAP-XPS). Meanwhile, the adsorbed Ni<sup>2+</sup> acts as in situ structural template, inducing the evolution of mesopores into narrow micropores, increasing the intermolecular forces between the pore walls and CO<sub>2</sub>. The synergistic enhancement effect of chemical and physical adsorption significantly improves the CO<sub>2</sub> adsorption performance of biochar. The Ni-loaded biochar achieves a CO<sub>2</sub> adsorption capacity of 4.49 mmol/g at 25 °C and 1 bar, and a CO<sub>2</sub>/N<sub>2</sub> dynamic separation coefficient of 74.47 in multi-component breakthrough experiments. This study provides a green and sustainable approach that combines heavy metal pollution control with the development of CO<sub>2</sub> capture materials, delivering dual energy and environmental benefits.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140326"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Magnetic field-enhanced catalytic mechanism for green syngas production from phenolic tar in biomass pyrolysis 生物质热解酚醛焦油制备绿色合成气的磁场增强催化机理
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-07 DOI: 10.1016/j.energy.2026.140381
Chongmin Wang , Baofeng Zhao , Haibin Guan , Di Zhu , Lei Chen , Yuying Zhao , Bari Wulan , Laizhi Sun , Tianyi Liu , Wanning Zheng
{"title":"Magnetic field-enhanced catalytic mechanism for green syngas production from phenolic tar in biomass pyrolysis","authors":"Chongmin Wang ,&nbsp;Baofeng Zhao ,&nbsp;Haibin Guan ,&nbsp;Di Zhu ,&nbsp;Lei Chen ,&nbsp;Yuying Zhao ,&nbsp;Bari Wulan ,&nbsp;Laizhi Sun ,&nbsp;Tianyi Liu ,&nbsp;Wanning Zheng","doi":"10.1016/j.energy.2026.140381","DOIUrl":"10.1016/j.energy.2026.140381","url":null,"abstract":"<div><div>Magnetic fields (MFs) present a promising strategy for enhancing catalytic performance in biomass tar reforming, though their underlying mechanisms remain incompletely understood. This study systematically investigated MF-induced enhancement of Ni-based catalysts for phenol cracking through integrated density functional theory (DFT) calculations and experimental validations. DFT calculations demonstrated that MF intensification induced an upshift in the Ni 3d-band center, enhanced orbital hybridization, and promoted electron transfer from Ni active sites to phenol molecules, consequently suppressing oxygen vacancy deactivation. Transition-state analysis revealed that MF optimized phenol adsorption configurations and reduced reaction energy barriers, facilitating radical-driven pathways. Experimental results showed that under an 80 mT MF at 700 °C, the Ni/CaO-Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub> catalyst achieved 98.7 % phenol conversion (a 33.2 % enhancement), with H<sub>2</sub> and CO yields increasing by 25.1 % and 60.7 %, respectively, while CO<sub>2</sub> emissions decreased by 37.5 %. Spectroscopic analyses (XPS, EPR) confirmed MF-mediated electron redistribution and oxygen radical suppression. These findings provide fundamental insights into MF-enhanced catalysis and advance the development of efficient, low-carbon biomass conversion technologies.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140381"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 multi-scale photovoltaic (PV) panel dust accumulation simulation dataset based on physical consistency modeling 基于物理一致性建模的多尺度光伏板积尘模拟数据集
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-01-31 DOI: 10.1016/j.energy.2026.140248
Linhong Chen , Siyuan Fan , Mingyue He , Shixian Ji , Shengxian Cao , Tianyi Sun , Yanhui Zhang , Yangwu Shen
{"title":"A multi-scale photovoltaic (PV) panel dust accumulation simulation dataset based on physical consistency modeling","authors":"Linhong Chen ,&nbsp;Siyuan Fan ,&nbsp;Mingyue He ,&nbsp;Shixian Ji ,&nbsp;Shengxian Cao ,&nbsp;Tianyi Sun ,&nbsp;Yanhui Zhang ,&nbsp;Yangwu Shen","doi":"10.1016/j.energy.2026.140248","DOIUrl":"10.1016/j.energy.2026.140248","url":null,"abstract":"<div><div>The lack of high-quality image datasets with quantifiable labels hinders the development of deep learning models for photovoltaic (PV) panel dust detection. To address this, this paper proposes a novel physical consistency modeling approach to generate a large-scale synthetic dataset with precise dust concentration labels. A particle cluster generation model is developed to simulate multiscale, heterogeneous dust aggregation governed by lognormal distributions, while an adaptive error feedback mechanism ensures accurate concentration estimation. Furthermore, an optical attenuation model based on the Beer-Lambert law and nonlinear hue, saturation, and value (HSV) color mapping is employed to ensure visual realism. Multi-dimensional evaluations demonstrate that the synthetic images achieve a histogram similarity exceeding 0.86, an entropy similarity above 0.94, and a comprehensive similarity score over 0.82 compared to real-world ground truth. These results significantly outperform conventional mask-based and generative adversarial networks (GANs) techniques, providing a reliable data source for training advanced dust detection algorithms.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140248"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Improving the long-term sustainability of photovoltaic thermal - ground source heat pump system by soil thermal balance regulation 通过土壤热平衡调节提高光伏热地源热泵系统的长期可持续性
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-11 DOI: 10.1016/j.energy.2026.140434
Han Yue , Wenqi Wei , Yong Zhang , Chao Cheng , Jiguang Huang , Haowen Liu , Heng Zhang , Haiping Chen
{"title":"Improving the long-term sustainability of photovoltaic thermal - ground source heat pump system by soil thermal balance regulation","authors":"Han Yue ,&nbsp;Wenqi Wei ,&nbsp;Yong Zhang ,&nbsp;Chao Cheng ,&nbsp;Jiguang Huang ,&nbsp;Haowen Liu ,&nbsp;Heng Zhang ,&nbsp;Haiping Chen","doi":"10.1016/j.energy.2026.140434","DOIUrl":"10.1016/j.energy.2026.140434","url":null,"abstract":"<div><div>The hybrid system combining photovoltaic thermal collectors (PVT) with ground source heat pump (GSHP) system has become a promising technology for realizing net-zero carbon emission buildings and PVT-GSHP system is capable to provide sufficient energy for building in cold region. However, the long-term utilization of soil thermal energy has seriously affected environment and system sustainable operation. Therefore, for exploring system design solution that achieves long-term stable operation, this work proposed an optimization method based on thermal imbalance (TIR), energy efficiency ratio (EER), life cycle cost (LCC) and carbon dioxide emission reduction (CDER). The system performance influence of PVT area, heat pump capacity, flow rate of PVT circulating pump and buried pipe drilling depth was studied. And the optimization research of the system in Beijing under long-term operation conditions was carried out. Besides, the weights of objective functions in the optimization and the system performance under different optimization cases were discussed. The results showed that when the solution considering TIR, TIR and LCC were reduced by 49.8%, 18.91% and EER, CDER were increased by 2.8%, 1.34 times when compared with no-TIR solution. Lower TIR ensures better comprehensive performance in long-term operation. Weight analysis showed that when TIR was considered, the weight distribution changed and the weight of LCC increased, which meant economic performance dominated in the optimization under long-term operation. The significance of this work proves the significance of soil thermal balance in PVT-GSHP systems and provide a practical method for PVT-GSHP system design.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140434"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Study of power recovery mechanism and system-level thermodynamic optimization of a novel compression high-temperature heat pump 新型压缩高温热泵功率回收机理及系统级热力优化研究
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-04 DOI: 10.1016/j.energy.2026.140216
Zhengyong Li , Youcai Liang , Yan Zhu , Shunchun Yao
{"title":"Study of power recovery mechanism and system-level thermodynamic optimization of a novel compression high-temperature heat pump","authors":"Zhengyong Li ,&nbsp;Youcai Liang ,&nbsp;Yan Zhu ,&nbsp;Shunchun Yao","doi":"10.1016/j.energy.2026.140216","DOIUrl":"10.1016/j.energy.2026.140216","url":null,"abstract":"<div><div>High-temperature heat pump technology is promising in the process of electrifying industrial heating. The high temperature characteristics cause limitations of refrigerant, component material, and cycle performance. To this end, this study employs a novel flash tank vapor injection enhanced cycle (NFVI-EEC) to explore the power recovery mechanism of the cycle. It features active dryness regulation, staged expansion, and dual-stage subcooling. In this paper, thermodynamic and economic models of NFVI-EEC are constructed, and the conversion principle and optimization direction of the throttling loss and the heat transfer loss are analyzed in detail. Innovatively, ejector efficiency and vapor injection efficiency, both centered on expansion work recovery capability, are proposed. Under typical operating conditions, using R1224yd(Z)/R1233zd(E) as refrigerant,the vapor injection efficiency of NFVI-EEC is improved by 14.96%-20.73% compared with FVIC; and the ejector efficiency is reduced by 9.99%-18.50% compared with BEEC. R1224yd(Z)/R1233zd(E) achieves the highest COP (3.51) among all refrigerant mixtures evaluated. Therefore, to further enhance the system performance of NFVI-EEC, the ejector efficiency can be used as an optimization target for further improvement. The theoretical framework for expansion process analysis constructed in this study will help guide the optimization of the expansion process in high-temperature heat pumps in the future.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140216"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Improved superhydrophobic surface for new phase-change thermal diode in building thermal management 建筑热管理中新型相变热二极管的改进超疏水表面
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-01-23 DOI: 10.1016/j.energy.2026.140161
Hengxin Zhao , Shiying Li , Yifan Wu , Hongli Sun , Borong Lin
{"title":"Improved superhydrophobic surface for new phase-change thermal diode in building thermal management","authors":"Hengxin Zhao ,&nbsp;Shiying Li ,&nbsp;Yifan Wu ,&nbsp;Hongli Sun ,&nbsp;Borong Lin","doi":"10.1016/j.energy.2026.140161","DOIUrl":"10.1016/j.energy.2026.140161","url":null,"abstract":"<div><div>Compared with traditional dynamic building envelopes, the performance-adjustable building envelopes combined with the new phase-change thermal diode offer the advantages of excellent adjustability and straightforward control. To further enhance the unidirectional heat transfer capability and durability of the new phase-change thermal diode in building applications, this study employed chemical etching to fabricate a silver nitrate-based superhydrophobic surface with small structural spacing. The experimental results show that the application of a silver nitrate-based superhydrophobic surface effectively ensured the durability and stability of the new phase-change thermal diode. The maximum forward thermal conductivity was found to be 8.85 W/(m·K) and the thermal rectification reached 78.81. This represents an improvement of between 30.89 % and 249.53 % compared to the laser-fabricated superhydrophobic surface. Additionally, simulation demonstrated the energy-saving potential of dynamic building envelopes combined with the new phase-change thermal diode in data centers across different climate zones. The maximum annual energy savings reached 325.62 kWh/m<sup>2</sup> were achieved, demonstrating significant application value. This study promotes the transition of performance-adjustable building envelopes from theoretical research to practical application, thereby fostering the dual development of the buildings and materials fields.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140161"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical investigation of combustion system design for knock mitigation and thermal efficiency enhancement in a carbon-neutral methanol engine 碳中性甲醇发动机减震增效燃烧系统设计数值研究
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-05 DOI: 10.1016/j.energy.2026.140333
Zhi Zhang , Chao Jin , Guofeng Yang , Haifeng Liu , Weide Chang , Zanqiao Shu , Zhiqin Jia , Hui Wang , Tiejian Lin , Hua Zhao , Mingfa Yao
{"title":"Numerical investigation of combustion system design for knock mitigation and thermal efficiency enhancement in a carbon-neutral methanol engine","authors":"Zhi Zhang ,&nbsp;Chao Jin ,&nbsp;Guofeng Yang ,&nbsp;Haifeng Liu ,&nbsp;Weide Chang ,&nbsp;Zanqiao Shu ,&nbsp;Zhiqin Jia ,&nbsp;Hui Wang ,&nbsp;Tiejian Lin ,&nbsp;Hua Zhao ,&nbsp;Mingfa Yao","doi":"10.1016/j.energy.2026.140333","DOIUrl":"10.1016/j.energy.2026.140333","url":null,"abstract":"<div><div>Methanol, a promising carbon-neutral fuel, enables engines operating stoichiometrically with a three-way catalytic converter (TWCC) to achieve high power output while maintaining low emissions. However, engine performance under high-load conditions is limited by knock and maximum in-cylinder pressure (P<sub>max</sub>). Combustion system plays a crucial role, yet research in this field remains scarce. This study performs a numerical investigation of a port-fuel-injection (PFI) heavy-duty spark-ignition (SI) methanol engine, with the objective of guiding combustion system design through enhanced in-cylinder flow, knock mitigation, and thermal efficiency improvement. The results indicate that designing chamber geometry for tumble ratio (TR) enhances turbulent kinetic energy (TKE) more effectively than adjusting swirl or squish flows. The tumble-optimized cylindrical chamber improves indicated thermal efficiency (ITE) by 0.5% over the original chamber. The diameter-depth ratio critically influences flow patterns—larger ratios increase TR during compression but reduce swirl ratio (SR). The high-TR (D86) and high-SR (D70) chambers, featuring large and small diameter-depth ratios respectively, significantly enhance combustion performance, while the medium diameter-depth ratio design (D78) exhibits intermediate performance. Compared to the D78 chamber, the D70 and D86 chambers achieve 0.3% and 0.5% higher ITE, representing improvements of 0.8% and 1.0% over the original chamber, respectively. Furthermore, the diameter-depth ratio significantly affects engine knock characteristics. The knock intensity (KI) initially decreases and then increases with increasing diameter-depth ratio. The D78 chamber exhibits the lowest knock tendency, indicating an optimal diameter-depth ratio near 2.5. This design achieves the highest ITE under both P<sub>max</sub> and knock-limited conditions, reaching 46.92% and 47.21%, respectively.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140333"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Influence of component arrangement on thermal management in immersion-cooled server boards 元器件布置对浸没冷却服务器板热管理的影响
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-10 DOI: 10.1016/j.energy.2026.140323
Morteza Khoshvaght-Aliabadi , Fatemeh Hojjati , Seyedmasoud Hassani
{"title":"Influence of component arrangement on thermal management in immersion-cooled server boards","authors":"Morteza Khoshvaght-Aliabadi ,&nbsp;Fatemeh Hojjati ,&nbsp;Seyedmasoud Hassani","doi":"10.1016/j.energy.2026.140323","DOIUrl":"10.1016/j.energy.2026.140323","url":null,"abstract":"<div><div>Effective thermal management is recognized as a key factor for ensuring the reliability, performance, and energy efficiency of high-density immersion-cooled server boards. In this study, a systematic investigation is conducted to examine the impact of component arrangement on the thermal-hydraulic behavior of single-phase immersion-cooled servers, considering three CPU layouts (transverse, longitudinal, and diagonal), three memory module configurations (spaced, compact, and distributed), and three dielectric coolants (EC-110, FC-40, and mineral oil) over a wide range of operating conditions. Results show that CPU layout dominates thermal behavior: transverse arrangements achieve the lowest temperatures and highest uniformity, longitudinal layouts experience pronounced thermal cascade, and diagonal layouts offer an optimal compromise with near-perfect CPU temperature uniformity and significantly reduced pressure drop. Memory module arrangement influences performance in a layout-dependent manner, with spaced, compact, or distributed configurations optimizing local heat transfer and suppressing thermal interaction between components. Increasing flow rate consistently reduces peak temperatures, while coolant properties critically impact thermal-hydraulic behavior, with EC-110 providing superior thermal stability, FC-40 enhancing uniformity, and mineral oil requiring higher pumping power. Importantly, minimum flow rates necessary for safe operation vary strongly with layout, highlighting geometric optimization as a more energy-efficient strategy than increased flow. This study demonstrates that strategic CPU and memory placement, particularly in transverse or diagonal configurations, enables lower peak temperatures, improved thermal uniformity, and reduced energy consumption. The findings provide actionable design guidelines for next-generation immersion-cooled data centers operating under increasingly high-power densities.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140323"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Prediction model for the initial dryout vapor quality in helically coiled tubes 螺旋盘管初始干汽质量预测模型
IF 9.4 1区 工程技术
Energy Pub Date : 2026-03-15 Epub Date: 2026-02-10 DOI: 10.1016/j.energy.2026.140377
Ningyuan Wang , Deqi Chen , Hanzhou Liu , Shanshan Bu , Hongxing Yu
{"title":"Prediction model for the initial dryout vapor quality in helically coiled tubes","authors":"Ningyuan Wang ,&nbsp;Deqi Chen ,&nbsp;Hanzhou Liu ,&nbsp;Shanshan Bu ,&nbsp;Hongxing Yu","doi":"10.1016/j.energy.2026.140377","DOIUrl":"10.1016/j.energy.2026.140377","url":null,"abstract":"<div><div>Dryout phenomena in helical-coileded steam generator tubes represent a critical limiting factor in thermal performance and operational safety. In this study, the initial dryout is examined through a combined experimental and theoretical approach, with particular focus on the influence of thermohydraulic parameters and vapor-liquid two-phase interactions on the critical vapor quality. Results indicate that dryout vapor quality is strongly correlated with the distribution of the annular liquid film, the intensity of secondary flows, and interfacial shear forces. Parametric sensitivity analyses reveal that increasing the inlet mass flux promotes liquid film redistribution under centrifugal effects and enhances secondary flow strength, thereby reducing the vapor quality at dryout. Conversely, higher pressure conditions suppress vapor expansion and void fraction, resulting in delayed dryout at elevated vapor qualities. The interfacial shear force, quantified using the slip ratio, exhibits a monotonic inverse relationship with dryout vapor quality, underscoring the role of secondary vapor flows in accelerating liquid film collapse. To further characterize the interaction between vapor-phase secondary motion and wall-adhering liquid films, a Centrifugal Punch Shear Interface (CPSI) analysis is proposed. Based on the analysis of interfacial interaction behavior, dimensionless parameters are introduced to quantify the effects of liquid film distribution, secondary flow patterns, and interfacial shear intensity on dryout. A predictive model for the critical vapor quality at initial dryout is developed based on these factors, achieving agreement with experimental data within a 15% deviation.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"347 ","pages":"Article 140377"},"PeriodicalIF":9.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
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