Thermal Science and Engineering Progress最新文献_第2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

Thermal Science and Engineering Progress Pub Date : 2024-10-30 DOI: 10.1016/j.tsep.2024.103021

{"title":"Energy-economic analysis and optimization of a shell and tube heat exchanger using a multi-objective heat transfer search algorithm","authors":"","doi":"10.1016/j.tsep.2024.103021","DOIUrl":"10.1016/j.tsep.2024.103021","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Thermal Science and Engineering Progress Pub Date : 2024-10-30 DOI: 10.1016/j.tsep.2024.103022

{"title":"Profiles of peripheral regulatory T cells forecasts the feasibility of steroid withdrawal after liver transplantation based on cellular thermal modeling","authors":"","doi":"10.1016/j.tsep.2024.103022","DOIUrl":"10.1016/j.tsep.2024.103022","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 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

Thermal Science and Engineering Progress Pub Date : 2024-10-29 DOI: 10.1016/j.tsep.2024.103020

{"title":"Experimental investigation of heat transfer augmentation of impinging jet solar air heater with stepped transverse ribs","authors":"","doi":"10.1016/j.tsep.2024.103020","DOIUrl":"10.1016/j.tsep.2024.103020","url":null,"abstract":"<div><div>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 (<em>p</em>) between ribs was 2, 4, and 8 cm, with Reynolds number (<em>Re</em>) varying from 4913 to 13103. The jet hole diameter (Dj) considered were 3, 6 and 9 mm. The maximum Nusselt number (<em>Nu</em>) with the recommended R1 rib having <em>p</em> = 4 cm and Dj = 3 and 6 mm equalled 128.784 and 104.5004 at <em>Re</em> = 13103, respectively, which was 31.22 and 21.76 % higher than that generated by smooth IJSAH. The friction factor (<em>f</em>) generated by the ribbed IJSAH having Dj = 6 mm and <em>p</em> = 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 <em>p</em> = 4 cm and Dj = 6 mm and equalled 1.75, which was 19.49 % higher than smooth IJSAH. The R1 rib with <em>p</em> = 4 cm at Re = 11465 demonstrated better thermal characteristics based on detailed investigation.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 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

Thermal Science and Engineering Progress Pub Date : 2024-10-28 DOI: 10.1016/j.tsep.2024.103016

{"title":"Study on the acoustic disturbance characteristics of the spray flame","authors":"","doi":"10.1016/j.tsep.2024.103016","DOIUrl":"10.1016/j.tsep.2024.103016","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

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

Thermal Science and Engineering Progress Pub Date : 2024-10-24 DOI: 10.1016/j.tsep.2024.103000

{"title":"Investigation of laminar flow and heat transfer performance of Gallium alloy based nanofluids in minichannel heat sink","authors":"","doi":"10.1016/j.tsep.2024.103000","DOIUrl":"10.1016/j.tsep.2024.103000","url":null,"abstract":"<div><div>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 %Al<sub>2</sub>O<sub>3</sub> relative to that of GaIn alloy is increased by 8.40 %, 7.63 %, and 0.22 %, respectively for Cu substrate at <em>φ</em> = 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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 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

Thermal Science and Engineering Progress Pub Date : 2024-10-20 DOI: 10.1016/j.tsep.2024.102951

{"title":"Experimental investigation on the design of a three-phase power factor corrector utilizing a SEPIC converter","authors":"","doi":"10.1016/j.tsep.2024.102951","DOIUrl":"10.1016/j.tsep.2024.102951","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Predicting the subcutaneous temperature in cryolipolysis using deep operator networks 利用深度算子网络预测冷冻溶脂过程中的皮下温度

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-10-01 DOI: 10.1016/j.tsep.2024.102946

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

Thermal Science and Engineering Progress Pub Date : 2024-10-01 DOI: 10.1016/j.tsep.2024.102917

{"title":"Effect of wheat bran filler particulates nettle fiber reinforced epoxy matrix composite − A novel material for thermal insulation application","authors":"","doi":"10.1016/j.tsep.2024.102917","DOIUrl":"10.1016/j.tsep.2024.102917","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Ai-enhanced thermal modeling for integrated process-product-system optimization in zero-defect manufacturing chains 零缺陷制造链中用于集成工艺-产品-系统优化的 Ai-enhanced 热建模

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-10-01 DOI: 10.1016/j.tsep.2024.102945

{"title":"Ai-enhanced thermal modeling for integrated process-product-system optimization in zero-defect manufacturing chains","authors":"","doi":"10.1016/j.tsep.2024.102945","DOIUrl":"10.1016/j.tsep.2024.102945","url":null,"abstract":"<div><div>This paper proposes a novel approach for realising zero-defect manufacturing by integrating AI-based thermal modelling to perform multi-stage process, product, and system optimisation in complex manufacturing chains. It integrates advanced thermal simulation and sensor data feed in real-time as a multistage thermal prediction and management system via machine learning algorithms. This framework seeks to predict thermal behaviour using a combination of convolutional neural networks (CNNs), long short-term memory (LSTM) networks, and graph neural networks (GNNs) for encoding, predicting, and learning the spatial, temporal, and interactive thermal behaviour, respectively. It further embeds finite element analysis (FEA) simulations for high-fidelity thermal predictions using data fusion through Kalman filters. This helps obtain the optimal estimates of thermal states from sensor measurements involving different types of sensors and the characteristics of signals. A multistage multimodal optimization framework involves genetic algorithms (GA) for global thermal parameter optimisation, reinforcement learning (RL) for multi-stage dynamic process control optimisation, and multi-agent systems (MAS) for coordinated multi-stage multi-objective balance embedded in a digital twin architecture. Evaluation results show that the effectiveness of the proposed system in improving the overall production efficiency is 33%, reducing defects is 47%, and reducing energy utilisation is 22%, when compared to the current de facto approaches. There is also a 38% improvement in predictive capability in preventing, detecting, and predicting of cross-stage process faults.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

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

Thermal Science and Engineering Progress Pub Date : 2024-10-01 DOI: 10.1016/j.tsep.2024.102955

{"title":"Material-level experimental study on utilising ionic liquid/graphene composites for sorption heat storage","authors":"","doi":"10.1016/j.tsep.2024.102955","DOIUrl":"10.1016/j.tsep.2024.102955","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0