Case Studies in Thermal Engineering最新文献

{"title":"Evaluating the performance and feasibility of integrating thermoelectric generators with solar photovoltaic panels: A case study","authors":"D Lakshmi Satya Nagasri, ram kumar Alajingi, Ponnambalam Pathipooranam, S. Senthil raja, Mohd Faiz bin Mohd Salleh, R. Marimuthu","doi":"10.1016/j.csite.2024.105572","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105572","url":null,"abstract":"This case study explores the integration of thermoelectric generators (TEG) with solar photovoltaic (SPV) panels, aiming to reduce panel temperature, improve energy density, and decrease space requirements. A comparative experimental analysis between ideal PV, PV + TEG, and PV alone is conducted. A 445Wp SPV panel for all cases with 180 TEGs attached in PV + TEG mode is analyzed. Experimental results show that the hybrid PV + TEG system enhances power density by 8.5 % and reduces space needs by 16 % for the same power output. However, the integration increases the cost per unit by 25.12 % compared to PV panels alone, making it less economically feasible. Ideal PV panels demonstrated superior cost efficiency and power density. Despite the higher operational costs, the hybrid system is beneficial in space-constrained scenarios due to its higher energy density. Further, a conclusion is drawn from the techno-economic analysis to focus on optimizing the number of TEGs placed under SPV and improving MPPT algorithms to enhance performance and reduce costs.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"28 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777474","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}

{"title":"Effectiveness of heat source/sink and Lorentz force constraints in a non-Newtonian peristaltic arterial blood hybrid nanofluid past an overlapping stenotic artery","authors":"Vedhesh Dhinakaran ,&nbsp;Keerthi Devarajan Anuradha ,&nbsp;J.U. Viharika ,&nbsp;Umair Khan ,&nbsp;Nermeen Abdullah ,&nbsp;Samia Elattar","doi":"10.1016/j.csite.2024.105577","DOIUrl":"10.1016/j.csite.2024.105577","url":null,"abstract":"<div><div>Recently a considerable amount of attention has been directed towards the technological advancements in the study of arterial stenosis. The deposition of adipose tissues and saturated fatty acids and the abnormal growth of flesh, narrows the arteries, leading to restricted blood flow. This causes cardiovascular diseases like atherosclerosis, atherogenesis, atheroma, etc. Considering this the present research paper develops a Casson fluid model to investigate magnetohydrodynamic peristaltic transport of the passage of blood through slightly stenosed arteries due to the influence of copper (Cu) and alumina (Al₂O₃) nanoparticles. The problem is formulated using appropriate mathematical models employing non-dimensional parameters and stenosis approximations. The study has its applications in the field of medicine. The outcome of this work is that it helps to handle many heart conditions. The findings of this investigation may have benefits in various academic fields, including pharmaceuticals and other industries. In addition, they are remarkably beneficial in the treatment of numerous cardiovascular diseases.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"65 ","pages":"Article 105577"},"PeriodicalIF":6.4,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ignition characteristics of H2-air mixtures with hot particles","authors":"Nupur Gupta, Rohit Kumar, Jithin Edacheri Veetil, Sudarshan Kumar, Ratna Kishore Velamati","doi":"10.1016/j.csite.2024.105557","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105557","url":null,"abstract":"Thermal ignition of fuel-air mixtures due to hot particles can pose security risks and be hazardous under various circumstances, leading to their auto-ignition. The ignition characteristics of hydrogen-air mixtures with hot particles were investigated by performing 2-D numerical simulations using a detailed H<ce:inf loc=\"post\">2</ce:inf>-air kinetic model. The simulations were performed with hot particles of various sizes and shapes with hydraulic diameters of 2, 4, and 6 mm. The effect of particle surface temperature on the ignition characteristics was studied by performing simulations at various particle surface temperatures ranging from 1000 to 1200 K. The results showed that for different particle shapes and sizes, the ignition delay depends strongly on the particle temperature. The location of the ignition point depends on the particle shape and temperature. A particle with a temperature of 1200 K ignites at the front stagnation point. The behavior significantly differs at 1000 K as the ignition location is shifted to a different point due to a competition between reaction kinetics and flow around the hot particles. Spherical particle showed the highest heat release rate compared to other particle shapes.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"19 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777484","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}

{"title":"Optimizing infrared drying of black soldier fly larvae for sustainable cricket feed production","authors":"Nuntawat Butwong, Sarawut Saenkham, Adisak Pattiya, Anuwat Saenpong, Chinnapat Turakarn, Aphichon Mungchu, Shenghua Hu, Sopa Cansee","doi":"10.1016/j.csite.2024.105582","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105582","url":null,"abstract":"As global demand for animal-derived protein surges, Black soldier fly larvae emerge as a promising sustainable feed source, particularly for cricket farming. This study investigated the infrared drying of whole larvae, exploring its potential as an efficient alternative to conventional drying methods for producing high-quality cricket feed. The effects of temperature (50 °C, 60 °C, 70 °C) and air velocity (1.0, 1.5, 2.0 m/s) on drying behavior, energy consumption, and moisture diffusivity were examined. Higher temperatures significantly reduced drying time, with 70 °C leading to the fastest drying in ∼5 h. While air velocity had minimal impact on overall drying time, it influenced drying rates. The optimal specific energy consumption was 1.58 MJ/kg water evaporated at 60 °C. The Logarithmic and Midilli models best described the drying kinetics, with R<ce:sup loc=\"post\">2</ce:sup> &gt; 0.99. Effective moisture diffusivity ranged from 2.28 × 10<ce:sup loc=\"post\">−9</ce:sup> to 3.09 × 10<ce:sup loc=\"post\">−8</ce:sup> m<ce:sup loc=\"post\">2</ce:sup>/h, increasing with temperature. Activation energy values spanned from 56.88 kJ/mol at 1.0 m/s to 115.41 kJ/mol at 2.0 m/s air velocity. This study demonstrated that infrared drying offered a balanced approach for larvae processing, providing faster drying times and moderate energy consumption compared to hot air and solar drying, making it a viable option for producing sustainable cricket feed.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"13 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777480","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}

{"title":"Research on pipeline-type power frequency electromagnetic heating system and multi-layer winding based power regulation method","authors":"Feng Zhou, Longyun Liu, Zixuan Wang, Xin Tong, Yanping Liu","doi":"10.1016/j.csite.2024.105525","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105525","url":null,"abstract":"Aiming at the issues of complexity, high investment costs, limited heating efficiency improvement, high failure rate, and poor reliability of traditional intermediate and high frequency electromagnetic heating systems, we propose a pipeline-type power-frequency electromagnetic coupling heating device. This device is designed based on transformer principles and utilizes Maxwell's equations and Fourier's heat conduction equation theory to achieve high efficiency and uniform heating. By performing three-dimensional transient field analysis of the heating device, parameters such as the voltage of the primary winding and the secondary winding (pipeline) are calculated to validate the feasibility of the heating scheme. To further enhance the economic efficiency of the heating device, the magnetic induction strength of the core with different hollow sizes is investigated. From this, the optimal hollow radius of the core structure was determined, achieving a saving ratio of approximately 36.52 %. Temperature field analysis of the heating device demonstrated that setting the fluid inside the pipeline to a certain water flow rate can achieve efficient heating of the fluid. Additionally, for applications requiring power regulation, a multi-layer winding-based power regulation method is proposed. Calculations show that this method achieves a heating efficiency exceeding 98 % under four different power settings. Compared to mid- and high-frequency electromagnetic coupling heating and electrode boiler heating methods, the heating efficiency increases by 1.39 % and 8 %, respectively. The proposed pipeline-style power-frequency electromagnetic coupling heating device does not require a boiler body, power electronic components, or even a high-power electrical transformer, thus significantly reducing costs compared to mid-frequency electromagnetic heating devices and electrode boilers, greatly enhancing economic efficiency. The study results suggest that energy output can be managed as needed, reducing the impact of loading and unloading on the local power grid and equipment, demonstrating strong practicality. This provides a new effective heating approach for industrial production of hot water and steam, centralized heating in urban and rural areas, and thermal power plants.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"16 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777481","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}

{"title":"Reducing peak thermo-electricity energy demand in building: Insights from sensible and latent storage – Applicable in hot and arid regions","authors":"Wajdi Rajhi ,&nbsp;Noreen Izza Arshad ,&nbsp;Naoufel Kraiem ,&nbsp;Ahmed Mir ,&nbsp;Lioua Kolsi ,&nbsp;Ahmad H. Milyani ,&nbsp;Mohammed N. Ajour ,&nbsp;Hesham A. Alhumade ,&nbsp;Aliakbar Karimipour","doi":"10.1016/j.csite.2024.105578","DOIUrl":"10.1016/j.csite.2024.105578","url":null,"abstract":"<div><div>In hot and desert regions, buildings have a considerable share in electricity consumption, so supplying electricity in critical hours for building cooling is always challenging for the electricity supply grid. In this numerical study, using sensible and latent-based storage approaches, the goals of peak shaving and load shifting were pursued. The sensible-based approach (first technique) was followed by adding a cold water storage tank which is responsible for cooling the building during critical hours. The tank is charged by the chiller during off-peak hours. The latent-based approach (second technique) was achieved through phase change materials (PCMs) integrated into building envelopes. Owing to using the sensible-based approach, not only was the electricity consumption completely cut during critical hours, but the peak hour was postponed to the early hours of the next day (i.e., load shifting). Based on the results, using the first technique does not necessarily lead to peak shaving. To follow the goal of peak shaving, the use of the second technique is recommended. The simultaneous use of both approaches made the building meet the cooling requirements during critical hours without receiving electricity from the supply grid. Moreover, the building receives up to 54.9 % less electricity from the grid (peak shaving), and simultaneously peak hour was postponed by at least 6 h (load shifting).</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"65 ","pages":"Article 105578"},"PeriodicalIF":6.4,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal decomposition behaviors and reaction mechanism of emulsion explosive with the addition of TiH2 powders","authors":"Rong Liu, Xu-Guang Wang, Hao Wang, Quan Wang, Yang-Fan Cheng","doi":"10.1016/j.csite.2024.105583","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105583","url":null,"abstract":"To explore compatibility and thermal stability of the emulsion explosive added with TiH<ce:inf loc=\"post\">2</ce:inf> powders, the actions of TiH<ce:inf loc=\"post\">2</ce:inf> powders on the thermal decomposition properties, reaction product compositions of the emulsion explosives were researched by TGA-FTIR, TG-DSC, XRD and XPS. The results manifested that the adding of 7.6 μm TiH<ce:inf loc=\"post\">2</ce:inf> powders in the range of 2–8 mass% could reduce the initial decomposition temperature of the emulsion explosive and promote the thermal decomposition reaction. The apparent activation energies of pure emulsion explosive sample were 110.5 and 107.05 kJ/mol, respectively. When the addition of 7.6 μm TiH<ce:inf loc=\"post\">2</ce:inf> powders to emulsion explosive was 2 mass%, the apparent activation energy decreased to the minimum value, which were 100.1 and 95.9 kJ/mol, respectively. While the initial decomposition temperatures and the activation energies of explosive samples added with TiH<ce:inf loc=\"post\">2</ce:inf> powders with particle sizes of 33.7, 50.1 and 120.0 μm both continued to rise. Furthermore, based on the experimental results, the thermolysis mechanism of emulsion explosive added with TiH<ce:inf loc=\"post\">2</ce:inf> powders was proposed. This study is helpful to further understand the thermolysis properties and reaction mechanism of emulsion explosives containing TiH<ce:inf loc=\"post\">2</ce:inf> powders, and offer theoretic direction for the formulation optimization as well as industrial production of high-energetic emulsion explosives.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"5 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777475","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}

{"title":"A three-dimensional analytical model for performance evaluation of thermoelectric generators","authors":"Dandan Pang, Aibing Zhang, Baolin Wang, Guangyong Li, Jia Lou","doi":"10.1016/j.csite.2024.105579","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105579","url":null,"abstract":"A three-dimensional (3D) theoretical model for thermoelectric generators (TEGs) has been developed in this paper, yielding analytical solutions for power output and energy conversion efficiency. The model comprehensively considers convective heat transfer between the thermoelectric legs and their ambient environment, as well as 3D heat conduction within the ceramic substrates. Numerical results reveal the significant influence of convective heat loss from the legs' surfaces on efficiency, especially for taller legs or higher heat convection coefficient, while having a minimal impact on power output for the constant temperature boundaries. It is shown that neglecting 3D heat conduction within the ceramic substrates leads to a substantial overestimation of TEG performance. Additionally, the complex 3D heat conduction problem for TEGs can be simplified into a more manageable 1D model with only minor adjustments to classical TEG theory. This is achieved by introducing analytical expressions for a dimensionless impact factor to quantify convective heat loss from the legs’ surfaces and the effective thermal conductance of the ceramic substrates. The proposed model serves as a valuable tool for simplifying the modeling process and optimizing the design of actual TEGs.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"37 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777472","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}

{"title":"Numerical investigation and optimization of liquid battery thermal management system considering nanofluids, structural, and flow modifications under high discharge cycles","authors":"Abdelrahman Gasmelseed, Mhadi A. Ismael, Mior A. Said, Faiz Ahmad","doi":"10.1016/j.csite.2024.105573","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105573","url":null,"abstract":"The thermal management of electric vehicle (EV) batteries continues to be a pressing challenge preventing wider EV adoption due to performance and safety concerns. Liquid battery thermal management systems (BTMSs) are the most commercially viable thermal management option due to their high heat transfer efficiency and compact design, despite these promising features, the current liquid BTMS designs suffer from high energy consumption and temperature gradients which severely affect the BTMS performance. To address these issues, this study numerically investigated the influence of various liquid BTMS design parameters for a 12 cylindrical lithium-ion battery module. The study evaluated 21 different BTMS configurations based on the maximum battery temperature, temperature difference, pressure drop, and energy consumption. Based on the selected evaluation criteria, The optimized liquid BTMS design (one cooling block, bidirectional flow, 0.0015 kg/s mass flow rate, 4 mm cell spacing, continuous operation strategy with hybrid CuO-MgO-TiO<ce:inf loc=\"post\">2</ce:inf> water 0.5 % concentration nanofluid) maintained the maximum temperature and temperature difference at 31.34 and 5.3 °C respectively, a 4.3 % and 21.1 % improvement compared to the base design, with a total pressure drop of 12.84 Pa when operated under 35 °C ambient temperature and 3C discharge rate. Proving the effectiveness of the proposed liquid BTMS design.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"1 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777482","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}

{"title":"Numerical heat transfer analysis considering thermal contact conductance between rough reciprocating sliding surfaces","authors":"Yuwei Liu ,&nbsp;Jiasong Yang ,&nbsp;Zhiqiang Guo ,&nbsp;Yanpeng Yuan ,&nbsp;Weizheng Zhang ,&nbsp;Sichuang Wanyan","doi":"10.1016/j.csite.2024.105580","DOIUrl":"10.1016/j.csite.2024.105580","url":null,"abstract":"<div><div>The frictional heat generated leads to elevated surface temperatures, which markedly influence the reliability and service life of friction pairs. Considering the dynamic changes in the thermal contact conductance and friction coefficient, the heat transfer equations which consist of heat exchange due to temperature difference and frictional heat generation at the sliding interface have been established. A finite element heat transfer model is constructed between two rough reciprocating sliding surfaces. The influences of the reciprocating motion and the interface thermal contact conductance on the heat flow distribution coefficient and surface contact temperature are solved by numerical simulations respectively. Furthermore, a prediction model is developed based on the BP neural networks. The results indicate that the heat flow distribution coefficient and surface contact temperature increase with rising motion frequency or interface thermal contact conductance and eventually reach a steady state. Moreover, for a fixed motion frequency, both parameters increase linearly with motion amplitude under different interface thermal contact conductance. The prediction model for heat flow distribution coefficient and surface contact temperature shows average relative errors of 0.45 % and 3.53 %, respectively. This research provides a new efficient way to analyze heat transfer in reciprocating sliding contacts and predict the contact surface temperatures.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"65 ","pages":"Article 105580"},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}