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Parabolic Trough Collector and Central Receiver Coupled with Fresnel Lens:Experimental Tests

International Journal of Automation and computing 2020年第4期17卷 572-587页

作者： Angelica Palacios Dario Amaya olga ramos Universidad Militar Nueva Granada Bogota 110121Colombia

Renewable energies have a high impact on power energy production and reduction of environmental pollution worldwide,so high efforts have been made to improve renewable technologies and research about *** paper presents the thermal performance results obtained by simulation and experimental tests of a parabolic trough collector with central receiver coupled to Fresnel lens,under different configurations on the *** simulation method was computational fluid dynamics(CFD)analysis in SolidWorks(R)soft-ware tool,which works with Naiver-Stokes equations to converge on a *** tests were formed with all configurations proposed and three observations for each one,a total of 12 observations were performed in all *** a result,the best thermal performance in simulation was achieved with the Fresnel lens and black pipe collector,with a maximum temperature of 116℃under 1000 W/m^2 radiation,the same system achieved in experimental tests a maximum temperature of 96℃with a radiation of 983 W/m^2.

关键词： Solar collector parabolic trough collector Fresnel lens thermal conductivity solar power

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Receiver tube heat transfer analysis of a CCP collector designed based on branched fractals geometry

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International Journal of Agricultural and Biological Engineering 2020年第5期13卷 56-62页

作者： Angélica Palacios Darío Amaya olga ramos GAV Research Group Universidad Militar Nueva GranadaBogota 110111Colombia

For the development of systems related to renewable energy and specifically for thermo-solar energy,it is essential to study and analyze the different thermal phenomena of heat transfer,in search of the best conditions that allow strengthening the *** such as radiation,convection,and conduction are highly studied,from the field of materials to the field of infrastructure,finding day to day optimal solutions that guarantee a great use of the solar resource available on the earth's *** study presented the results of heat transfer analysis on a receiver pipe in a CCP;designed using the theory of branched fractal geometry to improve the heat transfer associated with concentrating solar capture systems.A fractal structure as a branch or arboreal fractal type network,influenced thermal and electrical parameters,as electrical resistance,thermal resistance,and convective heat transfer,so increasing the level branch heat transfer can be enhancement along of the *** use of renewable energies in agriculture benefits the industrial processes that require a continuous power system,due to climatic conditions and geographical location is not a guarantee in food production fields,which reason solar capture systems contribute to food dehydration processes,water heating,refrigeration,and energy production.

关键词： heat transfer fractal geometry solar collector fractality fractal dimension parabolic cylindrical concentrator

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基于分支分形几何设计的CCP集热器的吸热管传热分析

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农业工程技术 2021年第6期41卷 88-88页

作者： Angélica Palacios Darío Amaya olga ramos GAV研究小组哥伦比亚波哥大努瓦格拉纳达军事大学

为了开发与可再生能源,特别是太阳能集热相关的系统,有必要研究和分析不同的热传递现象,以寻求最佳条件强化设计。从材料领域到基础设施领域,人们对辐射、对流和传导等现象进行了深入研究,不断寻求最佳解决方案,以保证地球表面可用的太... 详细信息

为了开发与可再生能源,特别是太阳能集热相关的系统,有必要研究和分析不同的热传递现象,以寻求最佳条件强化设计。从材料领域到基础设施领域,人们对辐射、对流和传导等现象进行了深入研究,不断寻求最佳解决方案,以保证地球表面可用的太阳能资源得到充分利用。该文介绍了用分支分形几何理论设计的聚光太阳能集热系统接收管的传热分析结果。分形结构作为一种树枝状或树栖的分形网络,影响着热学和电学参数,如电阻、热阻、对流换热等,因此增加分支水平可以提高集热管的热交换能力。农业中使用可再生能源对需要不间断电力系统的工业过程是有利的,因为气候条件和地理位置的限制不能保证稳定的粮食生产,因此太阳能收集系统对粮食脱水过程、水加热、制冷和能源生产等也是有帮助的。

关键词：传热分形几何太阳能集热器分形分形维数抛物柱面聚光器

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Development and characterization of whey protein films incorporated with tarbush polyphenols and candelilla wax

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Food Bioscience 2022年第1期45卷 1-7页

作者： olga B.Alvarez-Perez Janeth M.Ventura-Sobrevilla Cristian Torres-Leon Romeo Rojas-Molina Raúl Rodríguez-Herrera Miguel A.Aguilar-Gonzalez Cristobal N.Aguilar Bioprocesses and Bioproducts Research Group Food Research DepartmentSchool of ChemistryUniversidad Autonoma de Coahuila25280SaltilloCoahuilaMexico School of Health Sciences Universidad Autonoma de Coahuila26090Piedras NegrasCoahuilaMexico School of Agronomy Research Center and Development for Food IndustryUniversidad Autonoma de Nuevo Leon6050General EscobedoNuevo LeonMexico Center for Research and Advanced Studies of the National Polytechnique Institute Parque Industrial Saltillo-Ramos ArizpeCoahuilaMexico

Edible films were prepared with whey protein incorporating candelilla wax,and glycerol in aqueous *** polyphenols were added as bioactive *** optimization based on the water vapor permeability(WVP)of the formulation was performed using a Box-Behnken *** films were characterized by the determination of WVP,moisture,solubility,color,antioxidant and antifungal *** electron microscopy(SEM)was also performed to observe the surface and cross-section *** lowest permeability values were found with concentrations of 1.27,0.3 and 0.5% of protein,wax and glycerol *** was proved that the addition of polyphenols into films causes a significant effect only on solubility and transparency *** films have suitable properties as a barrier for the goods they could be applied *** is proposed for use in foods such as fresh or minimally processed fruits and vegetables.

关键词： Edible films Whey protein Shelf life Candelilla wax Euphorbia antisyphilitica Fluorensia cernua polyphenols

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