Thermal Science and Engineering Progress最新文献

{"title":"Optimization of liquid film parameters of indirect evaporative cooling system based on machine vision","authors":"Yuwen You ,&nbsp;Yan Chen ,&nbsp;Bin Yang ,&nbsp;Chunmei Guo ,&nbsp;Rong Gao ,&nbsp;Yiwei Ma","doi":"10.1016/j.tsep.2024.102997","DOIUrl":"10.1016/j.tsep.2024.102997","url":null,"abstract":"<div><div>The wet channel plate surface of indirect evaporative cooler (IEC) cannot be completely wet in actual working conditions, and the plate surface parameters of liquid film wetting rate and liquid film thickness are difficult to observe, and the lack of relevant experimental research and data support. Therefore, in this paper, machine vision technology will be used to experimentally investigate the wetting rate and liquid film thickness of the secondary side channel of the IEC, and the UDF interface program and the parameters of the original simulation model will be enhanced. The results show that the average and maximum errors of the first and second outlet temperatures of the corrected analytical model are reduced compared with the original model, and the average error is within 5% under different spray flow rates.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102997"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658108","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}

{"title":"Study on the effect of the mixing method on particulate matter in compounded medication of insoluble β-lactam antibiotics: Simulation of biomedical heat transfer mechanism","authors":"Li Guochun ,&nbsp;Xu Hong ,&nbsp;Li Sulian ,&nbsp;Deng Shuxia ,&nbsp;Deng Gulin ,&nbsp;Huang Xinwu","doi":"10.1016/j.tsep.2024.102982","DOIUrl":"10.1016/j.tsep.2024.102982","url":null,"abstract":"<div><div>The combination of insoluble β-lactam antibiotics has been widely used in clinical therapy, but its release in vivo and bioavailability remain challenges. This study aims to simulate the mechanism of biomedical heat transfer and analyze the influence of particulate matter in the combination of insoluble β-lactam antibiotics, so as to improve the therapeutic effectiveness of the drugs and optimize the clinical medication regimen. A mixed method was used to study the particulate matter of insoluble β-lactam antibiotics. In vitro simulation systems, combined with computational fluid dynamics (CFD) and heat conduction models, were used to evaluate drug release behavior in organisms. The physicochemical properties of the particles were determined and their heat transfer efficiency under different biomedical conditions was evaluated. The results showed that different types of particulate matter had significant effects on the release rate and bioavailability of β-lactam antibiotics. Simulations show that the optimized particle structure can significantly increase the local concentration of the drug and thus enhance the antibacterial effect under specific conditions of biomedical heat transfer. Through the simulation of the biomedical heat transfer mechanism of the mixed method, we can better understand the behavior of particles in the compound administration of insoluble β-lactam antibiotics, and explore the personalized medication strategy based on this mechanism.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102982"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533793","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}

{"title":"Influence of internal flow structure on flow energy losses in a centrifugal pump with splitter blades using entropy generation theory","authors":"Mona Gad ,&nbsp;Bo Gao ,&nbsp;Dan Ni ,&nbsp;Wenbin Zhang ,&nbsp;Longlong Yan ,&nbsp;Ning Zhang","doi":"10.1016/j.tsep.2024.102936","DOIUrl":"10.1016/j.tsep.2024.102936","url":null,"abstract":"<div><div>Centrifugal pumps are essential in various industrial applications, including renewable energy. To maximize the pump’s overall performance, estimating flow energy losses (FEL) is crucial. However, due to internal flow complexity, it is necessary to employ new methods and approaches to better understand FEL mechanisms. This study uses entropy generation theory to investigate the relationship between FEL and various flow patterns in all pump hydraulic components. Numerical simulations were conducted using a 3-dimensional incompressible unsteady flow at four different flow coefficients. The delayed detached eddy simulation (DDES) model was used, and the results showed good agreement with experimental data compared to the SST k-<em>w</em> model. Emphasis was given to the flow energy losses and the relative and absolute velocity distribution in the impeller and diffuser components at various flow coefficients. Flow energy losses primarily occur in the impeller (70%) followed by the diffuser (23%). Impeller losses are concentrated at the outlet region due to the wake-jet phenomena (28.6%), splitter blades region (15.3%), and impeller’s leading edge (LE) (10.7%). Vaned diffuser losses occur in the vanless zone (stator-rotor interaction) and near leading/trailing edges.<!--> <!-->Moreover, wall shear stress and the significant relative velocity gradient near the walls of the impeller and diffuser blades are the main contributors to the FEL in this region. This study provides insights into a better understanding of FEL mechanisms and highlights areas for improving pump performance.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102936"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356839","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}

{"title":"Optimization of zero superheat control at the evaporator outlet: Application of EXV and pressure regulation valve","authors":"Xingxing Ma ,&nbsp;Jinfeng Wang ,&nbsp;Jing Xie ,&nbsp;Hao Xu ,&nbsp;Guosen Ye ,&nbsp;Jilin Jiang ,&nbsp;Xinrong Han","doi":"10.1016/j.tsep.2024.102919","DOIUrl":"10.1016/j.tsep.2024.102919","url":null,"abstract":"<div><div>Zero superheat degree at the outlet of the evaporator is important for the efficient operation of refrigeration systems. Though it is the theoretically possible to control zero superheat degree to zero, it is rare to find publications in this area. In this study, the effects of the electronic expansion valve and the pressure regulation valve on zero superheat control investigated experimentally. The results indicate that when the control value of degree was set to zero, the electronic expansion valve could not achieve accurate control. The evaporation pressure and temperature kept changing, and the refrigerant flow state at the outlet of the evaporator alternated dramatically at the same time. There was a significant appearance of liquid refrigerant at the evaporator outlet. However, the stable control of zero superheat could be achieved when using the Electronic Expansion Valve and Pressure Regulation Valve Common Control Method (EPCCM). The combination of the pressure regulation valve and the Electronic Expansion Valve enables independent control of the evaporation pressure and the superheat degree at the outlet of the evaporator, which makes it possible to control the superheat of the refrigerant at the outlet of the evaporator to zero. The experiment results also show that the EPCCM has remarkable effect on zero superheat control, as well as safe and stable operation of the refrigeration systems.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102919"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356779","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}

{"title":"A unique solar pond system integrated with chlor-alkali electrolyser for heat storage and hydrogen production","authors":"Dogan Erdemir ,&nbsp;Ibrahim Dincer","doi":"10.1016/j.tsep.2024.102922","DOIUrl":"10.1016/j.tsep.2024.102922","url":null,"abstract":"<div><div>Solar ponds are recognized as a simple, but a unique solution for renewable heat storage to use later. A freshwater feed to solar ponds is considered a crucial requirement to maintain the salinity gradient accordingly for heat storage purposes. This study aims to benefit from this specific requirement for solar ponds by integrating chlor-alkali electrolysers to produce hydrogen along with heat storage, which is a common purpose of a solar pond. Therefore, the proposed system establishes a desirable synergy, as per the sustainable development goals, between a conventional solar pond and an innovative high-tech hydrogen production system. In order to produce hydrogen, the saline water withdrawn from the upper convective zone is used in a chlor-alkali electrolyser powered by solar PV in order to produce green hydrogen. Thus, a conventional solar pond is converted into an integrated energy system that produces hydrogen and chlorine for useful purposes, along with heat storage capability. The system’s performance has been assessed in terms of the energy and exergy efficiencies for five distinct cities located in different countries that are grappling with poverty. The system’s performance, which is assessed in five cities, demonstrates the energy and exergy efficiencies ranging from 11.66 % to 14.56 % and 6.84 % to 8.60 % for the solar pond. They vary from 21.95 % to 24.22 % and from 14.23 % to 14.66 % for the overall system, respectively. Furthermore, the system effectively captures and stores solar energy, and it reaches temperatures up to 89.1°C. Moreover, the proposed system is expected to contribute to the United Nations’ Sustainable Development Goals by addressing energy poverty, promoting clean energy, and fostering economic growth.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102922"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427349","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}

{"title":"A comprehensive techno-eco-environmental investigation of an efficient biodiesel generation procedure through hydrodynamic cavitation","authors":"Jie Dai ,&nbsp;Abdulkareem Abdulwahab ,&nbsp;Jeyraj Selvaraj ,&nbsp;M. Hasanuzzaman ,&nbsp;Ankit Kedia ,&nbsp;Wu Fengli","doi":"10.1016/j.tsep.2024.102916","DOIUrl":"10.1016/j.tsep.2024.102916","url":null,"abstract":"<div><div>The growth of cleaner biodiesel generation associated with hydrodynamic cavitation from canola oil via transesterification is acquiring prominence owing to considerably descending energy needs and time. In this work, the conversion of canola oil into biodiesel and glycerol was achieved through the process of transesterification with methanol, employing sodium hydroxide as a catalyst. The newly offered process was investigated from technical, economic, and environmental points of view, and the precision of the results was verified and accepted compared to previously published works. The technical results revealed that the maximum exergy destruction rates as well as exergy efficiency belonged to the transesterification process. The economic study showed that the capital cost of the process was 638.7 MUSD/year. Also, the return period was computed less than 4 years. Moreover, comparison analysis proved that Canola oil proved to be a more advantageous primary material for the production of biodiesel and was more appropriate from the exergoeconomic point of view in comparison to Jatropha oil and other materials. Finally, by increasing the conversion percentage of the reactor, the value of the exergo-environmental index and the factor of exergy stability increased significantly, which was considered as an advantage from an environmental standpoint.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102916"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427871","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}

{"title":"Performance evaluation of composite phase change materials with varying expanded graphite content in a drawer-type latent heat storage tank","authors":"Jiwei Fang,&nbsp;Yingling Cai,&nbsp;Tingting Deng","doi":"10.1016/j.tsep.2024.102970","DOIUrl":"10.1016/j.tsep.2024.102970","url":null,"abstract":"<div><div>The poor thermal conductivity of single-component phase change materials (PCMs) significantly impacts the operational efficiency of solar combi-systems. There is still a gap in the research on the heat release behavior of composite phase change materials (CPCMs). Therefore, this study investigated the heat release behavior of a self-developed drawer-type heat storage tank by varying the content of expanded graphite (EG) in the CPCMs used in it. Simulation was carried out using COMSOL Multiphysics 6.1, followed by experimentation on a test bench. The average outflow temperature, effective energy conversion (EEC), and heat release rate were used to evaluate the performance of the tanks. Comparing the simulation with experimental results, a maximum error of 8.75 % was obtained, indicating the accuracy of the study. The results indicate that adding EG can significantly improve the thermal conductivity of CPCM, with superior heat release behavior observed when the mass fraction of EG reaches 5 %. Under similar temperatures, the average outflow temperature from a 5 % EG tank is approximately 4.4 °C higher, EEC is 84 % higher, and heat release rate is 1.63 times higher than that from an ordinary thermal tank. Under different temperatures in a 5 % EG tank, increasing by 5 °C results in an average outflow temperature increase of 4.1 °C, EEC increase by a factor of one and an increase in heat release rate by 36 %. This study provides valuable insights for subsequent research on operation strategies for solar combined systems.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102970"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427883","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}

{"title":"A statistical physics-based methodology for evaluating the efficiency of an adsorption refrigeration cycle using C3H2F4/Maxsorb III","authors":"Wouroud Sghaier,&nbsp;Yosra Ben Torkia,&nbsp;Abdelmottaleb Ben Lamine","doi":"10.1016/j.tsep.2024.102940","DOIUrl":"10.1016/j.tsep.2024.102940","url":null,"abstract":"<div><div>Recently, the statistical physics modeling found a great success in the description of various aspects of adsorption phenomena such as olfaction, depollution, and photovoltaic processes. Therefore, we attempted here to apply this treatment in the domain of refrigeration by an adsorption/ desorption process cycle, using the grand canonical formalism of the statistical physics as a working tool. So, for this study, four advanced equations based on statistical physics treatment are used to clarify the adsorption process at molecular level and define its physico-chemical parameters for refrigeration applications. Our results showed that the double layer model with two energies provides useful details concerning this phenomenon by determining the number of captured HFO-1234ze (E) (C₃H₂F₄) molecules per site <span><math><mrow><msub><mi>n</mi><mrow><mi>A</mi><mi>M</mi></mrow></msub><mo>,</mo></mrow></math></span> the density of receptor site <span><math><msub><mi>D</mi><mrow><mi>r</mi><mi>s</mi></mrow></msub></math></span>, the adsorption quantity at saturation N _{a sat} and two energetic parameters <span><math><msub><mi>P</mi><mrow><mi>h</mi><mi>s</mi><mn>1</mn></mrow></msub></math></span> and <span><math><msub><mi>P</mi><mrow><mi>h</mi><mi>s</mi><mn>2</mn></mrow></msub></math></span>. The steric results revealed that the adsorbed C₃H₂F₄ molecules tended towards a parallel position when the temperature increased. Evaluations of the adsorption energies and enthalpy values indicated that the anchoring process is exothermic and of a physisorption nature. In order to improve the thermodynamic efficiency, the coefficient of performance was calculated by analyzing changes in thermodynamic functions, giving a value of 0.58 for the C₃H₂F₄ / Maxsorb III. Also, the COP value can be enhanced by using the same adsorbate with high compressibility to minimize the machine size but changing the present adsorbent by activated carbon derived from biomass such as: Waste Palm Trunk (WPT-AC) and Mangrove wood (M−AC).</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102940"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427324","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}

{"title":"Numerical analysis of mono and hybrid nanofluids-cooled micro finned heat sink for electronics cooling-(Part-II)","authors":"Adeel Arshad ,&nbsp;Muhammad Ikhlaq ,&nbsp;Muhammad Saeed ,&nbsp;Muhammad Imran","doi":"10.1016/j.tsep.2024.103005","DOIUrl":"10.1016/j.tsep.2024.103005","url":null,"abstract":"<div><div>This study investigates the thermal and hydraulic performance of heat sinks with micro pin-fins in circular and rectangular configurations using mono and hybrid nanofluids. Motivated by the need for efficient cooling solutions in high-performance electronic devices, the research explores novel combinations of metallic oxide (Ag, MgO) and carbon-based nanoparticles (GNP, MWCNT) in nanofluids. A constant volume fraction of micro pin-fins and nanoparticles was maintained to assess their effects on thermohydraulic performance. The method involved experiments with aqueous nanofluids as coolants, measuring pressure drops (<span><math><mrow><mi>Δ</mi><mi>p</mi></mrow></math></span>) at the inlet and outlet. Thermal performance was evaluated using metrics like thermal resistance (<span><math><msub><mi>R</mi><mrow><mi>th</mi></mrow></msub></math></span>), Nusselt number (<span><math><mrow><mi>N</mi><msub><mi>u</mi><mrow><mi>avg</mi></mrow></msub></mrow></math></span>), pumping power (<span><math><mrow><mi>PP</mi></mrow></math></span>), volumetric flow rate (<span><math><mi>Q</mi></math></span>), overall performance (<span><math><mrow><mi>OP</mi></mrow></math></span>), and performance evaluation criterion (<span><math><mrow><mi>PEC</mi></mrow></math></span>). Results showed that GNP-based mono nanofluids significantly reduced <span><math><msub><mi>R</mi><mrow><mi>th</mi></mrow></msub></math></span> by 46.41% and increased <span><math><mrow><mi>N</mi><msub><mi>u</mi><mrow><mi>avg</mi></mrow></msub></mrow></math></span> by 60.54% and PEC by 62% in rectangular heat sinks compared to conventional water cooling. Comparisons between rectangular and circular configurations revealed minimal <span><math><msub><mi>R</mi><mrow><mi>th</mi></mrow></msub></math></span> differences of 2.54% and 3.57%. GNP-dispersed nanofluids outperformed other coolants, with the rectangular configuration achieving a higher <span><math><mrow><mi>PEC</mi></mrow></math></span> of 1.62 versus 1.52 for the circular configuration at Δ<em>p</em> = 820 Pa. The conclusions suggest that rectangular pin-fins with GNP-based nanofluids offer superior thermohydraulic performance. The key outcomes from current study have significant contribution in enhancing the cooling efficiency of advanced electronic systems.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 103005"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658082","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}

{"title":"Adaptive PID controller based direct torque control of fuel cell fed BLDC drive for industrial drives applications","authors":"P. Leninpugalhanthi ,&nbsp;R. Latha","doi":"10.1016/j.tsep.2024.102931","DOIUrl":"10.1016/j.tsep.2024.102931","url":null,"abstract":"<div><div>Fuel cell fed Brushless DC motors (BLDC) are widely used in electrical applications due to their more efficiency, simple and compact volume. With a simple traditional PID controller, it is challenging to adjust the settings and produce highlights with full power. In order to effectively regulate the torque and speed of a BLDC drive, the adaptive PID (APID) Controller based Direct Torque Control (DTC) is proposed in this paper. The proposed controller depended on the extra error of a spin around controller indication to understand non-linearity, parameter fluctuations, and burden transit difficulties that arise in the BLDC motor drive framework, to maintain good torque control performance, DTC is used as a suitable control technique in industrial drives systems. The comparison tests are step changes in the motor drive’s reference speed and torque. Simulations with MATLAB/Simulink and also experimental outcomes are utilized to validate the operation and performance of various vector control methods.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 102931"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427350","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}