Engineering reports : open access最新文献

{"title":"Deep Learning Based Visual Servo for Autonomous Aircraft Refueling","authors":"Natthaphop Phatthamolrat,&nbsp;Teerawat Tongloy,&nbsp;Siridech Boonsang,&nbsp;Santhad Chuwongin","doi":"10.1002/eng2.70055","DOIUrl":"https://doi.org/10.1002/eng2.70055","url":null,"abstract":"<p>This study develops and evaluates a deep learning based visual servoing (DLBVS) control system for guiding industrial robots during aircraft refueling, aiming to enhance operational efficiency and precision. The system employs a monocular camera mounted on the robot's end effector to capture images of target objects—the refueling nozzle and bottom loading adapter—eliminating the need for prior calibration and simplifying real-world implementation. Using deep learning, the system identifies feature points on these objects to estimate their pose estimation, providing essential data for precise manipulation. The proposed method integrates two-stage neural networks with the Efficient Perspective-n-Point (EPnP) principle to determine the orientation and rotation angles, while an approximation principle based on feature point errors calculates linear positions. The DLBVS system effectively commands the robot arm to approach and interact with the targets, demonstrating reliable performance even under positional deviations. Quantitative results show translational errors below 0.5 mm and rotational errors under 1.5° for both the nozzle and adapter, showcasing the system's capability for intricate refueling operations. This work contributes a practical, calibration-free solution for enhancing automation in aerospace applications. The videos and data sets from the research are publicly accessible at https://tinyurl.com/CiRAxDLBVS.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of the Paleocene Granite in the Lhasa Terrane of the Qinghai-Tibet Plateau and Its Constraints on the Evolution of the Neo-Tethys Ocean","authors":"Hu Yang,&nbsp;Yongling Chen,&nbsp;Chun Zhan,&nbsp;Peng Yang,&nbsp;Weibing Wang,&nbsp;Mingyuan Zhang,&nbsp;Zhixiong He,&nbsp;Jia Wang","doi":"10.1002/eng2.70049","DOIUrl":"https://doi.org/10.1002/eng2.70049","url":null,"abstract":"<p>Large-scale Cenozoic magmatic rocks in the southern Qinghai-Tibet Plateau show a key chapter of geological evolution, especially the northward subduction and gradual melting in the Neo-Tethys Sea plate during the collision between the Asian continent and the Indian plate, which reveals its geological importance. Although some progress has been made in the study of the Linzizong volcanic rocks in southern Lhasa during the India-Asia collision, the closure time of the Neo-Tethys Sea and the exact timing of the first India-Asia collision are still controversial in the geological community. This study focuses on the formation age, geochemical characteristics, and tectonic environment of the granitic diorite in the Duodigou area, central southern Lhasa. LA-ICP-MS U–Pb dating of zircons reveals that the diorite was formed in the Paleogene, with a specific age of 57.20 ± 0.56 Ma. Geochemical analysis indicates that the granite was formed in an island-arc magmatic environment and belongs to peraluminous I-type granite. Under the background of the continuous northward subduction in the Neo-Tethys plate, the interaction of marine sediment dehydration and melting led to the intrusion of basaltic magma into the crust, which led to the remelting of the lower crust and the formation of granitic magma. Through this study, we have further improved the chronological framework of Cenozoic magmatism in southern Lhasa and provided new geological constraints for the analysis of the Neo-Tethys Sea's evolution during the period.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70049","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GPU-Accelerated Lattice Boltzmann Simulations of Power-Law Non-Newtonian Fluid Flow in a Diagonally Driven Cavity Using D3Q27 MRT-LBM","authors":"Md. Mamun Molla,&nbsp;Amzad Hossain,&nbsp;Md. Mahadul Islam","doi":"10.1002/eng2.70047","DOIUrl":"https://doi.org/10.1002/eng2.70047","url":null,"abstract":"&lt;p&gt;The study examines the flow dynamics of power-law non-Newtonian fluids in a cubic cavity with a top lid-driven diagonally-driven diagonally using the D3Q27 multiple-relaxation-time (MRT) lattice Boltzmann method (LBM). This situation frequently occurs in both natural and industrial processes. Utilizing CUDA C++ programming on a graphics processing unit (GPU) speeds up the simulations, enabling effective investigation of intricate fluid dynamics. Non-Newtonian behaviors, such as shear-thinning and shear-thickening properties, are frequently found in many real-world fluid systems and are captured by the power-law rheology model. LBM provides a mesoscopic method that makes handling intricate geometries easier and scales effectively on GPUs and other parallel computing architectures. The simulations investigate how Reynolds numbers (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;R&lt;/mi&gt;\u0000 &lt;mi&gt;e&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;100&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;200&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;400&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;500&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;600&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;800&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;1000&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;1200&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ mathit{operatorname{Re}}=100,200,400,500,600,800,1000,1200 $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) and power-law indices (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;n&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;mo&gt;.&lt;/mo&gt;\u0000 &lt;mn&gt;8&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;mo&gt;.&lt;/mo&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ n=0.8,1,1.4 $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) affect non-Newtonian fluid flow characteristics like streamlines, velocity profiles, viscosity distributions, iso-surfaces, and helicity (twistiness). GPU acceleration makes faster simulations and parametric research possible, improving computational efficiency. These findings provide information for non-Newtonian fluid engineering applications in the food industry, biomedical engineering, and polymer processing. Because of their decreased viscosity, shear-thinning fluids have higher helicity than shear-thickening fluids. The numerical results of the study offer applicable standards for evaluating 3D codes for fluids with non-Newtonian power laws. The uniqueness is that a D3Q27 multiple-relaxation-time lattice Boltzmann method (MRT-LBM) fra","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research About Green Electricity and Zero-Carbon Fuel on Reduction of CO2 Emissions for Commercial Vehicles Under “Dual-Carbon” Target","authors":"Hua Huang,&nbsp;Bo Liu","doi":"10.1002/eng2.70012","DOIUrl":"https://doi.org/10.1002/eng2.70012","url":null,"abstract":"<p>China's CO₂ emissions from commercial vehicles have an important impact on global climate change. However, a systematic research analysis, especially from new energy in the “dual-carbon” time is still insufficient. Thus, based on zero-carbon energy (green electricity, green hydrogen, and green ammonia), this paper carries out the research about CO₂ emissions prediction between zero-carbon energy and diesel in light-duty trucks and different sales fraction projects of zero-carbon energy from 2020 to 2060, and the changes in the quantity of light-duty trucks (including stock, increment, scrap and total amount). The calculation results show that CO₂ emissions from diesel is the largest, a gradual upward trend in general, and reaches peak value in 2055 (1.793 billion tons). Based on different sales fraction projects for green electricity trucks, CO₂ emissions of peak in 2035. As penetration increases, CO₂ emissions gradually decline. Reduction of CO₂ emissions of Project_1 is 19.94% and will stabilize after 2055. However, CO₂ emissions of Project_4 stabilize after 2040 and 15 years earlier than Project_4's, and CO₂ emissions are nearly zero. The change rule of CO₂ emissions from “Diesel + Green Hydrogen” and “Diesel + Green Ammonia” is similar, and CO₂ emissions from “Diesel + Green Ammonia” is higher than that of “Diesel + Green Hydrogen”. The permeability of Project_4 changes greatly, and the results are a large reduction. Based on 2020's data, and as gray ammonia is fuel, the results show that the current overall emission level can be reduced only when the CO₂ emissions level for the production of gray ammonia reduces by less than 30% of the current level. These results obviously have guiding significance to low CO₂ emissions from commercial vehicles.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Enhancement and Regulation of Surface Optical Pressure by Optical Nano-Structures","authors":"Yukun Yuan,&nbsp;Qiang Zhang,&nbsp;Chunyang Gu,&nbsp;Siyu Huang,&nbsp;Fengzhou Fang","doi":"10.1002/eng2.70046","DOIUrl":"https://doi.org/10.1002/eng2.70046","url":null,"abstract":"<p>Optical pressure, arising from the interaction between light and matter, is typically confined to the range of pico-Newtons to nano-Newtons, which limits its practical application in engineering. Here, we propose a two-dimensional aluminum periodic rectangular nano-structure designed to enhance and regulate optical pressure through electromagnetic simulations. The distribution characteristics and underlying mechanisms of optical pressure on the nano-structure's surface are analyzed. The findings reveal that when the dimensions of the nano-structure are tuned to resonate with the incident field, the rectangular nano-structure generates significantly enhanced optical pressure compared to a planar surface. Furthermore, the optical pressure can be precisely modulated by adjusting the geometric parameters of the nano-structure, such as depth, width, and sidewall inclination angle. Our work provides a theoretical foundation for the design and optimization of advanced optical pressure sensors and demonstrates potential applications in precision laser power measurement, non-destructive testing, and optical propulsion systems.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70046","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"State Identification of Charging Module Based on SN-EMD-SSEE and DBO-HKELM","authors":"Bingyu Li,&nbsp;Xianhai Pang,&nbsp;Xuhao Du,&nbsp;Ziwen Cai","doi":"10.1002/eng2.70039","DOIUrl":"https://doi.org/10.1002/eng2.70039","url":null,"abstract":"<p>Lithium-ion batteries are widely used in emergency back-up power supply with its superior performance, and they are usually used with a charging module. The charging module is usually composed of power electronic devices, but failures may occur in power electronic devicesdue to device aging and mechanical vibration in the complex environment; it will result in huge economic losses. However, the protection function of the charging module covers short fault, over-voltage fault, and over-current at system level rather than the open-circuit fault of MOSFETs and diodes at component level, which leads to hidden fire danger or accident risks. To address this issue, this paper improved a new state identification method of charging module based on signal normalization (SN) which is specially designed, empirical mode decomposition (EMD), sequence signal entropy extraction (SSEE), hybrid kernel extreme learning machine (HKELM), and dung beetle optimization (DBO). In basic work, 10 measurable variables and 23 fault states are determined by simulating open-circuit faults at MOSFETs and diodes. In data pre-processing, SN-EMD-SSEE is developed to extract state characteristics values for high adaptability to full working condition and high significance for easy identification. In modeling, DBO-HKELM identification model is constructed by improving ELM (Extreme Learning Machine) and optimizing parameters based on DBO 60 state characteristics values and 24 states including normal state, which are, respectively, used as the input and output of the identification model. In verification, the proposed state identification method based on SN-EMD-SSEE and DBO-HKELM is embedded into the control chip of charging module to obtain fault state code in real time. The experimental results show that the proposed state identification method is robust, and its identification accuracy is up to 94.7%.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Transformer-Less Buck-Boost Converter With Reliability Assessment Using the Improved Markov Model","authors":"Ifham H. Malick,&nbsp;Mohammad Zaid,&nbsp;Javed Ahmad,&nbsp;Chang-Hua Lin,&nbsp;Marwan Ahmed Abdullah Alasali","doi":"10.1002/eng2.70015","DOIUrl":"https://doi.org/10.1002/eng2.70015","url":null,"abstract":"<p>This work proposes a new continuous input current cubic gain buck-boost converter with a simple structure and reduced components. The converter has minimal components consisting of a twin-switch configuration with a broad range of duty-cycle operations. The converter attains unity gain at 24.51% duty cycle and can perform under both the continuous and discontinuous modes of conduction. Adding to the fundamental analysis of the converter, a study to examine the converter's volumetric distribution and cost factor calculation is also discussed. The averaged small-signal model of the converter is formulated to assess the transfer function and the stability of the converter during its operation. The converter's reliability is also determined to assess its performance using the improved Markov model. The discussion of the variation of the reliability and the MTTF with parameters like the duty cycle of the active switch, input voltage, and output power is also highlighted in the paper. The converter performs at an efficiency of 95.20% while it delivers 100 W output power, making it feasible for low- to medium-power applications. The converter's 200 W hardware prototype is presented, followed by a discussion of the corresponding results. Furthermore, the dynamic state survey of the converter is also presented, where step changes in input voltage, load, and duty cycle are being considered.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strength–Ductility Synergy of Lightweight High Entropy Alloys","authors":"Fainah Madewu,&nbsp;Nicholus Malatji,&nbsp;Mxolisi Brendon Shongwe,&nbsp;Tawanda Marazani,&nbsp;Lehlogonolo Rudolf Kanyane","doi":"10.1002/eng2.70042","DOIUrl":"https://doi.org/10.1002/eng2.70042","url":null,"abstract":"<p>Lightweight high entropy alloys (LWHEAs) are a unique class of materials that combine numerous principal elements such as Al, Mg, and Ti, in equiatomic or near-equiatomic ratios. These alloys are suitable for high-performance applications in the aerospace, automotive, and defense industries due to their exceptional balance of lightweight, high strength, and superior ductility. The biggest obstacle in the development of LWHEAs is to attain a strength–ductility synergy. The mechanical performance of these alloys is influenced by intricate interactions between solid-solution strengthening, lattice distortion, and phase stability mechanisms, as well as intricate deformation processes like transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP). There remains a critical knowledge gap regarding how process parameters and processing methods influence the mechanical properties and microstructure, which are key factors in determining the strength–ductility synergy of LWHEAs. This study evaluated and figured out that the balance between strength and ductility in LWHEAs can be enhanced by optimizing microstructure through customized alloying and heat treatments. Various strategies, including the introduction of coherent precipitates, hierarchical structures, and grain refinement have also demonstrated usefulness in enhancing mechanical performance. The article presented a detailed review of the recent progress in the attainment of strength–ductility synergy in LWHEAs.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic Closed-Loop Supply Chain Network Design by Considering Robustness, Risk: An Automotive Case Study","authors":"Reza Lotfi,&nbsp;Mansour Bazregar,&nbsp;Sadia Samar Ali,&nbsp;Ebrahim Farbod,&nbsp;Sina Aghakhani,&nbsp;Zahra Roshan Meymandi","doi":"10.1002/eng2.70010","DOIUrl":"https://doi.org/10.1002/eng2.70010","url":null,"abstract":"<p>This study proposes a novel network architecture called SYnergistic CLosed-loop Supply Chain Network Design (SYCLSCND), which incorporates antifragility, sustainability, and agility while considering environmental needs, risk, and robustness. Robust Stochastic Optimization (RSO) and weighted value at risk (WVaR) are recommended for coping with risk and robustness. For the first time, this model includes the expected value and WVaR of cost as an objective function. By including Blockchain Technology (BCT), sustainability (including renewable energy and hybrid vehicles for transportation items), agility (paying attention to demand fulfillment limits), and antifragility (flexible capacity), this research enhances the model. The case study is in the automotive industry. As seen in sensitivity analysis, a main model is 3.78% less than without synergistic. Finally, this study examines the impact of varying demand levels, conservatism coefficient, access level functions, and resiliency scores on cost and time computation. Decreasing demand levels make the use of certain technologies impractical and economically unfavorable. Increasing the conservatism coefficient increases cost and time computation. Different access level functions determine the model's risk-seeking or risk-averse nature. Increasing the resiliency score initially does not affect cost but opens new facilities and increases the cost when it reaches 41%. Increasing the scale of the problem exponentially increases cost and time computation.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic Performance Investigation of Solar-Driven Vapor Absorption Cooling System for Urban Areas","authors":"Laveet Kumar,&nbsp;Hamza Shaikh,&nbsp;Ahmad K. Sleiti,&nbsp;Muhammad Amir Raza","doi":"10.1002/eng2.70035","DOIUrl":"https://doi.org/10.1002/eng2.70035","url":null,"abstract":"<p>Solar energy in urban areas due to excessive air conditioning usage in buildings may significantly reduce the consumption of fossil fuels. This study uses TRNSYS to undertake the thermal performance analysis of solar-driven vapor absorption cooling systems for several urban cities in Pakistan with varying climatic conditions. Two separate solar collectors—flat plate collector (FPC) and evacuated tube collector (ETC)—are used to simulate the cooling system. The system's performance is evaluated based on the solar fraction (SF) and primary energy savings. The results of simulation showed that ETC would be a better choice regarding the selection of solar collector as the system with ETC achieved a higher SF and primary energy saving (<span></span><math>\u0000 <mrow>\u0000 <msub>\u0000 <mi>f</mi>\u0000 <mrow>\u0000 <mtext>saving</mtext>\u0000 <mo>,</mo>\u0000 <mi>shc</mi>\u0000 </mrow>\u0000 </msub>\u0000 </mrow></math>). The SF ranges from 13% to 78% and 13% to 64% for ETC and FPC, respectively. The primary energy saving ranges from 75% to 93% and 75% to 96% with flat plate and ETC, respectively. For both flat plate and ETCs, increasing the collector area increased the SF and primary energy savings while increasing the capacity of thermal storage decreased the SF and primary energy savings. For varying thermal storage volumes, the SF varies very little when using flat plate collector but significantly when using ETC. The best thermal performance was recorded in Peshawar based on the SFs and primary energy saving.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":"7 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.70035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}