Applied Thermal Engineering最新文献_第8页

Comparative analysis of turbine expander regulation strategies in PEMFC systems: Steady-state and transient performance insights PEMFC系统中涡轮膨胀器调节策略的比较分析：稳态和暂态性能洞察

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-07 DOI: 10.1016/j.applthermaleng.2025.126751

Fojin Zhou , Chengwei Sun , Qianya Xie , Xingyi Li , Yongjun Li , Ji Pu , Jun Li , Changqing Du

{"title":"Comparative analysis of turbine expander regulation strategies in PEMFC systems: Steady-state and transient performance insights","authors":"Fojin Zhou , Chengwei Sun , Qianya Xie , Xingyi Li , Yongjun Li , Ji Pu , Jun Li , Changqing Du","doi":"10.1016/j.applthermaleng.2025.126751","DOIUrl":"10.1016/j.applthermaleng.2025.126751","url":null,"abstract":"<div><div>Recycling energy from exhaust gases is an effective strategy to improve the efficiency of fuel cell systems (FCS). To elucidate the energy recovery characteristics of variable nozzle turbine (VNT) regulation across the full operating range of FCS, this study conducts experimental analysis of the impact mechanisms of fixed and variable schemes of turbine nozzles on the steady-state performance and dynamic response of FCS. The results demonstrate that condition-adaptive adjustment of the turbine nozzle opening significantly improves energy recovery efficiency. At a current density of 0.8 A cm<sup>−2</sup>, the variable nozzle opening (VNO) scheme achieves a net output power of 102.86 kW, representing a 4.9 % enhancement compared to the fixed nozzle opening (FNO) scheme with 20 % opening. Energy recovery is highly sensitive to the turbine nozzle opening. Unlike the FNO scheme, which fails to fully recover exhaust energy across all operating points, the VNO scheme achieves complete recovery, with recovered energy accounting for 35–40 % of the air compressor’s power consumption. Dynamic performance analysis reveals that the difference in air supply response time between the two schemes during load variations from 0.2 A cm<sup>−2</sup> to 0.8 A cm<sup>−2</sup> is approximately 6.1 %. However, the VNO scheme significantly reduces gas pressure fluctuations, ensuring superior air supply quality. This study reveals the synergistic optimization mechanism of turbine expander regulation on the full-range performance of FCS, providing a theoretical foundation and key technical pathway for the development of high-power-density fuel cell systems.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126751"},"PeriodicalIF":6.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941818","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

Multi-objective optimization of the operation strategies for heat pump tumble dryers with different fabric types 不同织物类型热泵滚筒式干燥机运行策略的多目标优化

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-07 DOI: 10.1016/j.applthermaleng.2025.126752

Haerang Jo , Dongchan Lee , Soonbum Kwon , Yongju Lee , Yongchan Kim

{"title":"Multi-objective optimization of the operation strategies for heat pump tumble dryers with different fabric types","authors":"Haerang Jo , Dongchan Lee , Soonbum Kwon , Yongju Lee , Yongchan Kim","doi":"10.1016/j.applthermaleng.2025.126752","DOIUrl":"10.1016/j.applthermaleng.2025.126752","url":null,"abstract":"<div><div>The heat and mass transfers in a heat pump tumble dryer are significantly influenced by the fabric properties and operating factors, including the temperature, humidity, and volumetric airflow rate. In this study, optimal operating strategies for heat pump tumble dryers with various fabric types are developed in terms of the compressor frequency and fan rotational speed. The evaporation characteristics of each fabric type are measured under various operating conditions. A heat pump tumble dryer simulation model for each fabric type is developed by combining a heat pump model with a tumble drum model based on experimental correlations. Consequently, the optimal fan speed for each fabric type is determined at a specific compressor frequency. Increasing the compressor frequency leads to increased energy consumption, resulting in a trade-off between the Moisture Extraction Rate (MER) and Specific Moisture Extraction Rate (SMER). Moreover, the energy efficiency of the system is evaluated through the coefficient of performance. Additionally, Pareto-optimal solutions for each fabric type are determined using multi-objective optimization. Under the condition of maximum SMER, the MERs and SMERs increased by 7.4–9.4% and 3.1–4.5%, respectively, compared with those in the conventional energy-priority mode. Similarly, under the condition of maximum MER, the MERs and SMERs increased by 6.7–9.9% and 7.9–12.1%, respectively, compared with those in the conventional performance-priority mode.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126752"},"PeriodicalIF":6.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927832","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

Optimal design of heat pump assisted thermally coupled distillation sequences 热泵辅助热耦合蒸馏流程的优化设计

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-07 DOI: 10.1016/j.applthermaleng.2025.126753

Zinet Mekidiche , Juan A. Labarta , José A. Caballero

{"title":"Optimal design of heat pump assisted thermally coupled distillation sequences","authors":"Zinet Mekidiche , Juan A. Labarta , José A. Caballero","doi":"10.1016/j.applthermaleng.2025.126753","DOIUrl":"10.1016/j.applthermaleng.2025.126753","url":null,"abstract":"<div><div>This work presents a comprehensive methodology for the optimal design of heat pump-assisted, thermally coupled distillation sequences, aiming to support the electrification and decarbonization of energy-intensive industrial processes. A rigorous simulation-based optimization approach is developed, coupling Aspen HYSYS with MATLAB through a client–server architecture. Optimization is carried out using a customized Particle Swarm Optimization algorithm. The methodology simultaneously considers optimal column sequencing, thermal coupling, direct and indirect heat integration (via vapor recompression and bottom flashing cycles), process intensification strategies such as Divided Wall Columns, and heat recovery techniques inspired by Self-Heat Recuperation Technology. The model is applied to several case studies involving the separation of zeotropic quaternary mixtures. Results indicate that the electrification of distillation sequences can be usually achieved with minimal or no economic penalties while reducing reliance on fossil-based utilities. But even in cases in which the full de-fossilization has an important penalty cost, the optimal solution usually includes heat pumps (partial electrification) with significant economic and environmental benefits compared with the actual configurations without heat pumps.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126753"},"PeriodicalIF":6.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942583","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

Effect of thermocouple design and engine exhaust pulsations on mean gas temperature accuracy 热电偶设计和发动机排气脉动对平均气体温度精度的影响

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-06 DOI: 10.1016/j.applthermaleng.2025.126600

Varun Venkataraman, Ulf Olofsson, Andreas Cronhjort

{"title":"Effect of thermocouple design and engine exhaust pulsations on mean gas temperature accuracy","authors":"Varun Venkataraman, Ulf Olofsson, Andreas Cronhjort","doi":"10.1016/j.applthermaleng.2025.126600","DOIUrl":"10.1016/j.applthermaleng.2025.126600","url":null,"abstract":"<div><div>Accurate measurement and modeling of mean exhaust gas temperature (EGT) in internal combustion engines (ICEs) is paramount to improve its emission and efficiency while maintaining component durability. Sheathed thermocouples provide a robust and cost-effective EGT measurement to the detriment of accuracy due to the junction’s heat balance. Literature indicates that exposing and reducing the thermocouple junction diameter improves the mean measured EGT accuracy. However, such designs can affect its interaction with the pipe wall, the conventional heat sink for sheathed thermocouples. Furthermore, characteristics of the pulsating exhaust gas flow govern junction heat convection and heat conduction linked to the exposed wire length-to-diameter (l/d) ratio. Therefore, the complex interaction between thermocouple design attributes and the pulsating exhaust flow requires isolating the effects to derive the measurement accuracy benefits from exposed junction thermocouples. This study utilizes Type-K thermocouples in sheathed (6 mm) and multiwire exposed junction (51-<span><math><mrow><mn>254</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>) constructions downstream of a single-pipe exhaust of a heavy-duty diesel engine. Isolated engine speed and load sweeps provided distinct pulsating exhaust flow conditions measured using a Pitot tube for mass flux and the exposed junction heating rate to indicate the true EGT. The study highlights fundamental differences in the junction-to-pipe wall thermal interaction between sheathed and exposed thermocouples, motivating the need for distinct heat sinks and error correction before comparing measurements. Moreover, the nature of the pulsating exhaust flow conditionally enhances or undermines gains in mean EGT accuracy.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126600"},"PeriodicalIF":6.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928434","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 interpretable machine learning-based model of turbulent Prandtl number for supercritical CO2 under buoyancy 浮力下超临界CO2湍流普朗特数的可解释机器学习模型

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-06 DOI: 10.1016/j.applthermaleng.2025.126744

Ruizeng Zhang , Zhengwei Yang , Yu Liu , Qinggang Qiu , Xiaojing Zhu

{"title":"An interpretable machine learning-based model of turbulent Prandtl number for supercritical CO2 under buoyancy","authors":"Ruizeng Zhang , Zhengwei Yang , Yu Liu , Qinggang Qiu , Xiaojing Zhu","doi":"10.1016/j.applthermaleng.2025.126744","DOIUrl":"10.1016/j.applthermaleng.2025.126744","url":null,"abstract":"<div><div>Existing studies identify the failure of turbulent heat flux modeling—particularly the constant turbulent Prandtl number (<em>Pr<sub>t</sub></em>) assumption—as the primary cause of inaccurate heat transfer deterioration (HTD) predictions in supercritical fluids. To address this, we propose a dynamic <em>Pr<sub>t</sub></em> prediction framework based on interpretable machine learning (ML) to elucidate <em>Pr<sub>t</sub></em> evolution under buoyancy effects. The model comprises a <em>Pr<sub>t</sub></em> distribution framework integrating the thermophysical parameter (<em>Pr</em>) and a comprehensive factor <em>f<sub>sp</sub></em> that captures system parameter influences, and an ML module that nonlinearly maps multi-parameter effects into <em>f<sub>sp</sub></em>, overcoming the limitations of traditional empirical correlations. Results show that the model significantly improves HTD prediction accuracy and reveals that strong buoyancy necessitates a lower <em>Pr<sub>t</sub></em> to compensate for the turbulent diffusion attenuation. SHAP-based interpretability analysis further quantifies parameter influence hierarchies: heat flux and mass flow rate dominate HTD, inlet temperature, and pressure act independently without interfering with the effects of other parameters on heat transfer, and diameter amplifies the negative effects of heat flux and mass flow rate through synergistic interactions. This study establishes a high-accuracy, mechanically interpretable modeling paradigm for optimizing supercritical systems.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126744"},"PeriodicalIF":6.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924556","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

Numerical study on the stratified combustion characteristics of methanol-diesel dual direct injection for marine engine 船用发动机甲醇-柴油双直喷分层燃烧特性数值研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-06 DOI: 10.1016/j.applthermaleng.2025.126745

Wanchen Sun , Zhenshan Qin , Hao Zhang , Mengqi Jiang , Liang Guo , ChuanFu Kou , Zhiqin Jia , Hongwei Bian

{"title":"Numerical study on the stratified combustion characteristics of methanol-diesel dual direct injection for marine engine","authors":"Wanchen Sun , Zhenshan Qin , Hao Zhang , Mengqi Jiang , Liang Guo , ChuanFu Kou , Zhiqin Jia , Hongwei Bian","doi":"10.1016/j.applthermaleng.2025.126745","DOIUrl":"10.1016/j.applthermaleng.2025.126745","url":null,"abstract":"<div><div>Dual direct injection (DDI) is the optimal way to use methanol in diesel engine, but its control is complicated by numerous adjustable parameters. The paper aims to provide intrinsic guidance for the control simplification and optimization of DDI. Thus, the effect of two key injection parameters on stratified combustion characteristics has been numerically studied on a marine engine model to reveal the formation and regulation mechanism of the stratification of equivalence ratio.</div><div>Results show that the injection strategy of methanol-methanol-diesel is suitable for DDI with a three-layer stratification of equivalence ratio from high to low along the center to edge of the combustion chamber. The processes of combustion and pollutant generation can be flexibly controlled by adjusting the stratified state. Properly advancing the start of diesel injection (DSOI) can improve indicated thermal efficiency by more than 13 percentage points and obtain extremely low emissions of hydrocarbon and carbon monoxide, but excessive advance still leads to serious diesel homogenization and has an adverse effect on the initial ignition. Meanwhile, the ratio of the second methanol injection (MR2) determines the stratified state of equivalence ratio. The increase of MR2 is beneficial to improving the combustion speed and combustion quality with an 8 times reduction of combustion duration, but excessive increase also causes combustion roughness and sharp rise of nitrogen oxides. The appropriate values of DSOI and MR2 are around −8 degree of crank angle after top dead center and 55 %. At that condition, the indicated thermal efficiency is as high as 49.3 %, while the ringing intensity and nitrogen oxides are as low as 2.5 MW·m<sup>−2</sup> and 1.84 g·(kW·h)<sup>-1</sup>.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126745"},"PeriodicalIF":6.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927815","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

Experimental validation of a lower order model for a flat-plate latent thermal energy storage heat exchanger 平板潜热储能换热器低阶模型的实验验证

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-06 DOI: 10.1016/j.applthermaleng.2025.126733

Wim Beyne , Maike Johnson , Andrea Gutierrez , Michel De Paepe

{"title":"Experimental validation of a lower order model for a flat-plate latent thermal energy storage heat exchanger","authors":"Wim Beyne , Maike Johnson , Andrea Gutierrez , Michel De Paepe","doi":"10.1016/j.applthermaleng.2025.126733","DOIUrl":"10.1016/j.applthermaleng.2025.126733","url":null,"abstract":"<div><div>Latent thermal energy storage systems have seen a large amount of interest from a broad range of applications. Design and sizing of these systems however, remains difficult as finite volume methods are limited by computational resources. Furthermore, classic heat exchanger design methods are not applicable to storage systems as these design methods are based on a steady state analysis. The present paper proposes a computationally efficient modeling method that can deal with both the transient nature of the operation of the storage system and large domain sizes. The model is based on three previously developed separate sub-models, which are connected through a space-series approach. An essential new aspect of this work is the application of the method to a flat-plate latent thermal energy storage heat exchanger, for which a large experimental data set is available, including both melting and solidification experiments. Additionally, the model incorporates heat losses, which were not considered in previous models. The model predictions of the outlet temperature are on average within 1.2 K with the measured outlet temperature with the largest deviations at the start of the (dis)charging and at the end of the phase change. Further research is needed to refine the representation of phase change dynamics and heat losses to improve predictive accuracy. Despite these limitations, the model effectively predicts outlet temperature in most cases, while requiring minimal computational effort. Unlike finite volume methods, its computational cost remains independent of system size.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126733"},"PeriodicalIF":6.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936992","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

Reactive-extractive distillation processes design for aqueous ternary azeotrope separation 反应萃取精馏分离三元共沸水的工艺设计

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-06 DOI: 10.1016/j.applthermaleng.2025.126703

Yanlei Zhu , Hao Chen , Ning Li , Yong Liu , Rui Wang

{"title":"Reactive-extractive distillation processes design for aqueous ternary azeotrope separation","authors":"Yanlei Zhu , Hao Chen , Ning Li , Yong Liu , Rui Wang","doi":"10.1016/j.applthermaleng.2025.126703","DOIUrl":"10.1016/j.applthermaleng.2025.126703","url":null,"abstract":"<div><div>In the production of ethyl <em>tert</em>-butyl ether using ethanol and <em>tert</em>-butyl alcohol, aqueous ternary azeotrope is generated, and efficient separation methods are crucial for resource recycling and environmental protection. This study proposes an innovative reactive-extractive distillation process, in which ethylene oxide hydration reaction is introduced to consume water and produce ethylene glycol as an extractant to enhance the relative volatility between ethanol and <em>tert</em>-butyl alcohol, thereby facilitating efficient separation of the azeotropic system. The accuracy of the UNIQUAC thermodynamic model was verified and subsequently utilized to evaluate the feasibility of the reactive-extractive distillation coupled process through ternary phase diagrams with residual curves. A genetic algorithm was employed to optimize the process by minimizing the total annual cost, and the overall performance was evaluated through economic, environmental, and exergy analyses. Two thermally integrated processes with preheat and intermediate heat exchange were designed based on the advanced exergy analysis. Results show that the intermediate heat exchange intensified reactive-extractive distillation process achieves significant improvements over the traditional three-column extractive distillation, including reductions of 76.74% in total annual costs, 72.43% in CO<sub>2</sub> emissions, and 29.23% in exergy destruction, thereby offering practical solutions for process intensification and industrial application.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126703"},"PeriodicalIF":6.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927829","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

Binary salt mixture barium bromide-barium chloride for sorption applications 用于吸附的溴化钡-氯化钡二元盐混合物

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-06 DOI: 10.1016/j.applthermaleng.2025.126730

Jake Locke, Stan Shire, Steven Metcalf, Roger Moss, Robert Critoph

{"title":"Binary salt mixture barium bromide-barium chloride for sorption applications","authors":"Jake Locke, Stan Shire, Steven Metcalf, Roger Moss, Robert Critoph","doi":"10.1016/j.applthermaleng.2025.126730","DOIUrl":"10.1016/j.applthermaleng.2025.126730","url":null,"abstract":"<div><div>Large temperature ‘jump’ and ‘ramp’ techniques, along with thermogravimetric analysis (TGA), were employed to characterise the sorption reactions of halide salt mixtures with ammonia. Using LTJ and FTR methods, a 1:1 mixture containing 50 % BaCl<sub>2</sub> and 50 % BaBr<sub>2</sub> by molar weight was studied but remained inconclusively characterised. To investigate further, samples with different BaCl<sub>2</sub> and BaBr<sub>2</sub> molar ratios (1:3, 1:1, and 3:1) were prepared. TGA results confirmed the presence of a new compound with sorption properties that vary in proportion to the molar ratios of the component salts. The effect of altering these molar ratios was evident: BaCl<sub>2</sub>-rich mixtures resembled pure BaCl<sub>2</sub> salt behaviour, while BaBr<sub>2</sub>-rich mixtures behaved more like pure BaBr<sub>2</sub> salt. Adsorption and desorption findings indicated an optimal bromide content at 50 %, beyond which the position of the reaction band becomes relatively stable—a pattern not observed in BaCl<sub>2</sub>-heavy mixtures. These distinct reaction “bands” expand the temperature operating range of sorption technologies by up to 30 °C, suggesting that tailored anion halide salt mixtures could be developed for advanced heat pumping and thermal storage applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126730"},"PeriodicalIF":6.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924554","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

Thermomechanical transient stresses in compact heat exchangers: Experimental and numerical study 紧凑型热交换器中的热机械瞬态应力：实验和数值研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-06 DOI: 10.1016/j.applthermaleng.2025.126732

G. Zilio, M.V.V. Mortean, K.V. Paiva, T.S. Possamai

{"title":"Thermomechanical transient stresses in compact heat exchangers: Experimental and numerical study","authors":"G. Zilio, M.V.V. Mortean, K.V. Paiva, T.S. Possamai","doi":"10.1016/j.applthermaleng.2025.126732","DOIUrl":"10.1016/j.applthermaleng.2025.126732","url":null,"abstract":"<div><div>Compact heat exchangers (CHEs) can operate at high pressures and temperatures, requiring an adequate design of the geometric parameters to withstand these conditions. Therefore, they must have good thermo-hydraulic performance while withstanding high thermo-mechanical stresses. However, most works on CHE focus on thermal hydraulic performance or study thermal and mechanical stresses separately. To the best of our knowledge, this is the first study that analyzed transient thermomechanical stress, experimentally and numerically, in CHE fabricated with additive manufacturing (AM). A prototype was produced via AM with 46 channels and circular geometry. An experimental setup capable of applying high pressure (200 bar) and differential temperature (ΔT = 20 °C) was used, and a total of 40 tests under different conditions were carried out. A strain gage was positioned on the sample surface to measure the strain and estimate the stress. The stresses in the inside regions of the prototype were evaluated through a numerical model. The numerical model presented an average error of 2.7 % compared to the experimental data of thermomechanical stress. The stresses reached 36.9 MPa and 184 MPa on the surface and inside the sample, respectively. The validated model was utilized for higher temperature and pressure conditions, similar operation conditions of compact heat exchanger (P = 213.3 bar and ΔT = 100 °C). Transient stresses reach 527 MPa in the channel walls closer to the inlet region. The results showed that thermomechanical stress levels are higher than yield stress and close to the ultimate tensile strength of the stainless steel AISI 316L.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126732"},"PeriodicalIF":6.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924555","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