Mostrando ítems 1-20 de 71

Analysis and optimization for the process of glass tempering using autoclave

Acevedo Peñaloza, Carlos Humberto; VALENCIA OCHOA, GUILLERMO ELIECER; CARDENAS ESCORCIA, YULINETH DEL CARMEN (Journal of Physics: Conference SeriesEstados Unidos, 2018-12-07)

A mathematical analysis of the glass tempering process was carried out using an autoclave, varying the operating parameters of the system. It was found that the process time can be reduced by up to 3.23% by changing the ...
Analysis of research trends in biodiesel as fuel during last decade

Valencia Ochoa, Guillermo Eliecer; Acevedo Peñaloza, Carlos Humberto; Duarte Forero, Jorge; Mendoza-Casseres, Daniel; Obregon, Luis (International Journal of Applied Engineering ResearchIndia, 2018)

This paper presents a bibliometric study focused on the research carried out in the last 11 years on biodiesel as an alternative fuel. Tools such as HistCite were used to manage metadata found using the Web of Science ...
Análisis termodinámico y económico de sistemas de recuperación de calor residual de un motor de generación mediante tecnologías de ORC

Acevedo Peñaloza, Carlos Humberto (Universidad Francisco de Paula SantanderCúcuta, Norte de Santander, 2020-02-02)

Debido a los problemas que se han presentado por el uso excesivo de las fuentes de energía renovables se hace necesario investigar e incluir las nuevas alternativas energéticas, sin embargo, su implementación es costosa ...
Análisis térmico, modelamiento matemático y simulación de un reactor de agitación discontinuo para volumen específico

Rolon, Humberto; Acevedo Peñaloza, Carlos Humberto; Villamizar González, Yesenia (Revista UIS IngenieríasColombia, 2019-01-01)

El presente trabajo expone el análisis térmico y el modelamiento matemático de un reactor de agitación discontinuo. Se implementó una fase de adquisición de datos en cuanto alfuncionamiento y la utilidad de los reactores ...
Applied Bibliometric in the Advancement of Solar Energy Research

Torres Moreno, James; Acevedo Peñaloza, Carlos Humberto; Coba Salcedo, Milton Fabian (International Journal of Energy Economics and PolicyDubai, United Arab Emirates, 2022-07-19)

Bibliometrics has proven to be an efficient method for quantitative research on the statistical behavior of academic production, which allows analyzing existing data and documents to resolve trends in specific research ...
The architecture on land and its construction techniques, millenary tradition that is reborn

Hurtado-Figueroa, Oswaldo; Cárdenas-Gutiérrez, Javier Alfonso; Acevedo Peñaloza, Carlos Humberto (Contemporary Engineering SciencesBulgaria, 2018-08-30)

In the context of sustainable development, the use of materials of low environmental impact in the activities inherent to the construction of houses plays an important role when it comes to reducing waste pollution. The ...
Articulation of environmental management in projects of non-conventional energy sources in the Caribbean Colombian region

Acevedo Peñaloza, Carlos Humberto; VALENCIA OCHOA, GUILLERMO ELIECER; CARDENAS ESCORCIA, YULINETH DEL CARMEN (Journal of Physics: Conference SeriesEstados Unidos, 2018-12-07)

This work addresses an inclusion methodology based on criteria for the implementation of non-conventional energy sources and critical environmental factors for the licensing of the same, which is applied to the case study ...
Artisanal filter with geo-materials: a basic water treatment alternative for human consumption in marginal areas

Martinez Yanez, Daniela; PEDROZA ROJAS, ALVARO ORLANDO; Acevedo Peñaloza, Carlos Humberto (Contemporary Engineering SciencesBulgaria, 2018-11-29)

The article presents the design and development of filters (easy to implement in homes) that have the capacity to eliminate microorganisms and chemical substances; therefore, they act as handmade water purifiers. It ...
Behaviour of the contact trace in a cam-follower system when the displacement law has been designed using bézier curves

Acevedo Peñaloza, Carlos Humberto; Henao Leon, Diego; Rojas Suárez, Jhan Piero (Contemporary Engineering SciencesBulgaria, 2018-11-06)

The study shows the distribution of the contact trace in a cam - follower mechanism in which the Bézier curves of degrees 5, 7 and 9 have been used for the design of displacement of the follower. The equations that ...
A bibliometric analysis environmental impact assessment literature: An expanding and shifting focus

Coba Salcedo, Milton Fabian; Valencia Ochoa, Guillermo; Acevedo Peñaloza, Carlos Humberto (Chemical Engineering TransactionsItalia, 2018-09)

A bibliometric analysis of the literature on the subject of Environmental Impact Assessment for a period from 2007 to 2015 was carried out under an expanding and shifting focus. For this purpose, the metadata used ...
Bibliometric analysis of the thermal storage systems research in the last ten years

Peralta-Ruiz, Yeimmy; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (International Journal of ChemTech ResearchIndia, 2018)

In this research we analyze the state of the art of the technological developments that are being presented by the scientific community to mitigate the strong environmental changes with renewable energies. The results ...
Bibliometric study of state observer research applied to internal combustion engine

VALENCIA OCHOA, GUILLERMO ELIECER; Acevedo Peñaloza, Carlos Humberto; CARDENAS ESCORCIA, YULINETH DEL CARMEN (Journal of Physics: Conference SeriesEstados Unidos, 2018-12-07)

The present study was conducted to evaluate the worldwide scientific production related to observers applied to internal combustion engines by taking information from the Web of Science (WoS) database and taking the papers ...
Caracterización de la tasa de liberación de calor en los cilindros de un motor de generación a gas natural de 2 MW

Valencia-Ochoa, Guillermo; Duarte Forero, Jorge; Acevedo Peñaloza, Carlos Humberto (AiBi Revista de Investigación, Administración e IngenieríaColombia, 2020-01-01)

Desarrollar modelos matemáticos para los motores de generación de energía más confiables que permitan proponer un uso eficiente de los combustibles y aumentar la eficiencia de conversión energética, ...
Caracterización térmica de mezclas de arcillas utilizadas en la fabricación de productos de mampostería para la construcción

García León, Ricardo Andres; Flórez Solano, Eder; Acevedo Peñaloza, Carlos Humberto (Revista Colombiana de Tecnologías de AvanzadaColombia, 2018)

Actualmente en Norte de Santander existe gran variedad de yacimientos naturales que se pueden utilizar para fabricar productos de mampostería para la construcción como lo son bloques, ...
CFD performance analysis for Darrieus Hydrokinetic Turbine

Rolong Ortiz, Humberto; Acevedo Peñaloza, Carlos Humberto; Valencia, Guillermo (Journal of Engineering Science and Technology ReviewGrecia, 2019-04-10)

This work proposes the analysis of the behavior of a Darrieus type hydrokinetic turbine, starting from the mathematical model that allows to delimit the operation system, linking all the variables present in the phenomenon, ...
Clay surface characteristics using atomic force microscopy

Acevedo Peñaloza, Carlos Humberto; Florez, Eder; García León, Ricardo Andres (Revista Facultad de Ingeniería Universidad de AntioquiaColombia, 2018-06-07)

The first component for the manufacture of masonry products used in construction is clay, which provides the plasticity that facilitates the molding and handling of the product. The second component is the feldspar in form ...
Combustion and performance study of low-displacement compression ignition engines operating with Diesel–Biodiesel blends

Valencia, Guillermo; Acevedo Peñaloza, Carlos Humberto; Duarte Forero, Jorge (Applied SciencesSuiza, 2020-01-30)

This study investigated the influence of different biodiesel blends produced from residual sunflower oil and palm oil from agroindustry liquid waste on the characteristics of the combustion process, performance, and emissions ...
A comparative study of the cutting parameter in milling process under different material

Acevedo Peñaloza, Carlos Humberto; Valencia, Guillermo; Coba Salcedo, Milton Fabian (Contemporary Engineering SciencesBulgaria, 2018-06-18)

In the present study, the incidence of the variation in feed rate per tooth and depth of cut for SAE 4340 alloy steel and SAE J431 steel castings was analysed and in which material this variation is most noticeable. For ...
Comparison of the radius of curvature in the cams which used in the displacement law beziér curves and cyclic and harmonic curves

Acevedo Peñaloza, Carlos Humberto; Daza Buitrago, Miguel; Prada Botia, Gaudy Carolina (Contemporary Engineering SciencesBulgaria, 2018-11-07)

The work shows the radius of curvature for different variations of the angle of rotation β and of the ratio of Ro/L, the study is shown for the case in which the laws of displacement of the cams have been designed by ...
Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software

Cárdenas-Gutiérrez, Javier Alfonso; Acevedo Peñaloza, Carlos Humberto; Orjuela Abril, Martha Sofia (International Review on Modelling and SimulationsItalia, 2020-10)

The heat exchangers application in combined cycle power plants is a key aspect in the thermal and fluid mechanics sciences due to their elevated functionality in industrial processes related to the quality and the efficiency ...

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Analysis and optimization for the process of glass tempering using autoclave
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Acevedo Peñaloza, Carlos Humberto | 2018-12-07

A mathematical analysis of the glass tempering process was carried out using an autoclave, varying the operating parameters of the system. It was found that the process time can be reduced by up to 3.23% by changing the resistance to 15Ω, but increasing the resistance more than this value would mean compromising the quality of the final product. Thus, it is advisable to make variations of the resistance between 10Ω and15Ω, which will allow the optimization of the process time and pressures without affecting the quality of the result.

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Analysis of research trends in biodiesel as fuel during last decade
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Valencia Ochoa, Guillermo Eliecer | 2018

This paper presents a bibliometric study focused on the research carried out in the last 11 years on biodiesel as an alternative fuel. Tools such as HistCite were used to manage metadata found using the Web of Science search engine, including author names, titles, abstracts, publication dates, document types, addresses and references cited. In addition, the impact factor and H index of the journals they published were taken into account to analyze the reliability of the research. The study showed a tendency to increase over the years, from 76 publications in 2007 to a total of 2017 in 2017, an increase of 185.71%. Likewise, it was concluded, among other things, that of the 1423 documents obtained to carry out the study, 84.7% were scientific articles, being the majority of the works carried out, followed by the revisions that reached 5.8%. And that magazines such as FUEL, ENERGY & FUEL and ENERGY were among those that contributed the most to this research. In addition, it was demonstrated that the countries most interested in this technology are India, USA and Peoples R China, being these the ones with more than 254, 222 and 119 publications respectively.

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Análisis termodinámico y económico de sistemas de recuperación de calor residual de un motor de generación mediante tecnologías de ORC
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Acevedo Peñaloza, Carlos Humberto | 2020-02-02

Debido a los problemas que se han presentado por el uso excesivo de las fuentes de energía renovables se hace necesario investigar e incluir las nuevas alternativas energéticas, sin embargo, su implementación es costosa por lo cual es de vital importancia la investigación en la mejora de los mismo. Dentro de estos, se destaca el uso de sistema de recuperación de calor residual debido a la fácil adaptación que poseen, sin embargo, el uso racional de estos sistemas no garantiza un desarrollo amigable y/o sostenible medio ambientalmente. Este trabajo presenta un análisis exergo ambiental avanzado a un sistema de recuperación de calor ORC acoplado a un motor de combustión interna con evaporación indirecta con el fin de determinar la magnitud de cada componente de la planta y de esta manera identificar el potencial real de mejora. La exergía destruida es divida en 4 categorías: endógeno, exógeno, evitable e inevitable a su vez que son dividas en endógeno evitable e inevitable y exógeno evitable e inevitable. Con el fin de hacer el sistema mucho más eficiente se aplica un análisis de sensibilidad a las variables con mayor influencia en el sistema para denotar las oportunidades de mejora desde el punto de vista ambiental. Por último, un análisis de ciclo de vida es aplicado para determinar los impactos y dimensiones ambientales a lo largo de la vida útil del sistema.

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Análisis térmico, modelamiento matemático y simulación de un reactor de agitación discontinuo para volumen específico
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Rolon, Humberto | 2019-01-01

El presente trabajo expone el análisis térmico y el modelamiento matemático de un reactor de agitación discontinuo. Se implementó una fase de adquisición de datos en cuanto alfuncionamiento y la utilidad de los reactores de agitación. Posteriormente, se aplicaron los conceptos de termodinámica, mecánica de fluidos, transferencia de calor y transporte de materia,para realizar el respectivo análisis térmico,y así determinar la energía contenida y transferida en los fluidos utilizados.Por último, se dedujoun modelo matemático en el softwareEES,para comprobar su comportamiento,teniendo en cuenta las variables operativas sometidas a diversos tipos de fluidos. Además, se simuló el entorno físico-químico del reactor,para validar los datos calculados y compararlos con los valores experimentales, relacionando la geometría del equipo con las condiciones de trabajoy las especificaciones del producto final.

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Applied Bibliometric in the Advancement of Solar Energy Research
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Torres Moreno, James | 2022-07-19

Bibliometrics has proven to be an efficient method for quantitative research on the statistical behavior of academic production, which allows analyzing existing data and documents to resolve trends in specific research fields. Considering the database downloaded from Web of Science, with the help of Hitscite and VOSviewer data analysis tool and Microsoft Excel table, 7,259 publications related to solar energy research from 2010 to 2020 were obtained. The purpose of this research work is to apply bibliometric analysis methods to the development of scientific research on solar energy, as an important part of renewable energies, to evaluate its progress in the last decades and to describe these trends. The results showed that since 2015, research on solar energy has increased, especially in countries such as the United States and China, due to the Paris treaties where the goal is that the average temperature of the earth by the year 2100 does not exceed 1.5 °C. Since greenhouse gases are the cause of the greatest impact of the increase in global temperature, it is expected that researchers will focus on harnessing green energy and take a step further to reduce fossil fuels.

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The architecture on land and its construction techniques, millenary tradition that is reborn
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Hurtado-Figueroa, Oswaldo | 2018-08-30

In the context of sustainable development, the use of materials of low environmental impact in the activities inherent to the construction of houses plays an important role when it comes to reducing waste pollution. The alternative materials to be used in the various construction processes, besides being totally renewable, they must be reusable, available locally and have little or no energy expenditure in its extraction, preparation and application. The Bio resources or Eco materials meet these requirements, of which land as ancestral material used in millenary construction techniques, it becomes the most feasible alternative for its use as a construction material to replace the conventional ones. The main objective is the literary review of articles published in reliable databases, whose research topic was based on the analysis and use of land and natural materials for application in housing construction. The articles were categorized, analyzed and integrated into a synthesized structure to extract the important aspects in the thematic introduction, the constructive techniques, the results of the processes carried out and finally, the conclusions on the constructive implementation of the elements studied. In this way it offers information of interest to people who want to delve into the subject investigated.

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Articulation of environmental management in projects of non-conventional energy sources in the Caribbean Colombian region
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Acevedo Peñaloza, Carlos Humberto | 2018-12-07

This work addresses an inclusion methodology based on criteria for the implementation of non-conventional energy sources and critical environmental factors for the licensing of the same, which is applied to the case study installation of wind turbines in seawater desalination plants in Isla Grande - Bolívar, this study was carried out taking into account field visits, and previous studies, where its main researchers and observers coincide with the authors of this article, the proposal includes aspects that involve the matrix of project stakeholders, work is completed with the qualitative and quantitative analysis of the factors of greater environmental impact, within the obtained results it is emphasized that the greatest impact that this project makes to 170 habitants of Isla Grande Bolivar is the changes of the current and/or potential use of soil, soil contamination and displacement of birds, In mammal, reptile and amphibian communities, it is suggested that Environmental Management Plans (PMA) be implemented, such as programs for conservation management, soil resource management, and vegetation and wildlife management programs, allowing for effective licensing of the project benefiting equally the interest group.

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Artisanal filter with geo-materials: a basic water treatment alternative for human consumption in marginal areas
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Martinez Yanez, Daniela | 2018-11-29

The article presents the design and development of filters (easy to implement in homes) that have the capacity to eliminate microorganisms and chemical substances; therefore, they act as handmade water purifiers. It constitutes a reasonable alternative solution to the problem of contaminated water consumption, which can be applied in places of low economic resources.

LEER
Behaviour of the contact trace in a cam-follower system when the displacement law has been designed using bézier curves
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Acevedo Peñaloza, Carlos Humberto | 2018-11-06

The study shows the distribution of the contact trace in a cam - follower mechanism in which the Bézier curves of degrees 5, 7 and 9 have been used for the design of displacement of the follower. The equations that describe the movement of the follower and its derivatives are presented, the expressions are formulated for the contact trace, the force exerted on the mechanical assembly are formulated and the results obtained are presented in a model mechanism.

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A bibliometric analysis environmental impact assessment literature: An expanding and shifting focus
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Coba Salcedo, Milton Fabian | 2018-09

A bibliometric analysis of the literature on the subject of Environmental Impact Assessment for a period from 2007 to 2015 was carried out under an expanding and shifting focus. For this purpose, the metadata used was obtained through web of science and analyzed with the Histcite software. The search identified a total of 683 publications related to Environmental Impact Assessment in the period studied, allowing to study the main journals involved in this topic. The country with the highest number of publications was the United States with 88 papers on the subject. On the other hand, the journal with the greatest influence on the subject was Environmental Impact Assessment Review, with 1090 citations, representing the 8.7% of the total citations between 2007 and 2015. Analyzing the evolution of publications per year, there was an increase in research activity on the subject between 2012 and 2014, amounting to 45.6% in those years. According to the type of document from the 683 publications, the 84.6% (578) were articles and 4.4% reviews. These results obtained show an increase in the interest of researchers in the environmental impact assessment topic, which is in line with the climate changes presented on the planet and the global concern to reduce the effects of greenhouse gas, and the better use of natural resources.

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Bibliometric analysis of the thermal storage systems research in the last ten years
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Peralta-Ruiz, Yeimmy | 2018

In this research we analyze the state of the art of the technological developments that are being presented by the scientific community to mitigate the strong environmental changes with renewable energies. The results obtained by the bibliometric techniques in the period 2007-2018 show that in the 1900 published articles the People's Republic of China presents the highest volume of 32.3% of the total publications, showing a strong influence on the development of energy storage technologies and the availability of materials. The results presented in this article allow us to evaluate the development of researchers in this alternative of energy storage as a replacement to the distribution that is done with traditional methods.

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Bibliometric study of state observer research applied to internal combustion engine
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VALENCIA OCHOA, GUILLERMO ELIECER | 2018-12-07

The present study was conducted to evaluate the worldwide scientific production related to observers applied to internal combustion engines by taking information from the Web of Science (WoS) database and taking the papers published between 2001 − 2017. The works found are mostly research articles with a total of 130 articles equivalent to 97.01%, of the 134 articles studied, and it was also noted that the production of this type of work increased in the last 3 years, with the maximum value in 2015 being 22 articles, even in those 3 years, the greatest number of references were also found. The United States is the country with the highest number of publications with 42 followed by People´s Republic of China, France and UK with 41, 11 and 11 respectively. Although the USA is the country with the highest number of publications, China has consolidated its position as the country with the highest number of publications and citations in the last 3 years. However, within the top 10 institutes with the highest number of publications, 4 of them are from the United States, among which Ohio State University stands out as the institute with the highest number of publications with 16 (11.9%). On the other hand, the most commonly used words in the documents were observer (91), control (47), engine (47), based (42) and estimation (41).

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Caracterización de la tasa de liberación de calor en los cilindros de un motor de generación a gas natural de 2 MW
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Valencia-Ochoa, Guillermo | 2020-01-01

Desarrollar modelos matemáticos para los motores de generación de energía más confiables que permitan proponer un uso eficiente de los combustibles y aumentar la eficiencia de conversión energética, se ha convertido en uno de los principales objetivos de los trabajos de investigación en el área. Con el fin de estudiar el fenómeno liberación de calor en los cilindros de un motor a gas natural J612 Jenbacher de 2 MW a partir de variables medias disponibles enregistros operacionales, se ha propuesto un modelo semifísico a partir de balances de masa, energía, ecuaciones constitutivas y regresiones estadísticas. Los resultados muestran que a partir del modelo propuesto del calor rechazado con un coeficiente de determinación de 0.99, el permiten alcanzar un error relativo máximo de 2% en modo isla y del 4% operando en red para la estimación de la temperatura de los gases a las salidas de los cilindros. Así mismo, el modelo permite determinar la fracción de calor perdido en los cilindros en función de la energía aportada por el gas natural.

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Caracterización térmica de mezclas de arcillas utilizadas en la fabricación de productos de mampostería para la construcción
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García León, Ricardo Andres | 2018

Actualmente en Norte de Santander existe gran variedad de yacimientos naturales que se pueden utilizar para fabricar productos de mampostería para la construcción como lo son bloques, tejas,ladrillos, baldosas, entre otros; pero las empresas fabricantes obtienen muchos desperdicios debido a la falta de análisis tecnológicos de la materia prima para pronosticar el comportamiento de las pastas cerámicas y lograr mejorar la calidad del productofinal. En el presente trabajo se realizó las caracterizaciones térmicas de dos mezclas de arcillas (m7 y m8) encontradas experimentalmente utilizando el método de moldeo de extrusión y en polvo para la fabricación de bloques H-10 tomando como muestra la materia prima (arcilla) de una empresa dedicada a la fabricación de bloques H-10 en Ocaña, Norte de Santander. El desarrollo de la investigación se llevó a cabo mediante la ejecución de ensayos térmicos a las muestras de arcillas con los que se determinaronlos porcentajes pérdida de peso respecto a las temperaturas obtenidas en un diagrama con las curvas de ATD y ATG. Los resultados obtenidos demuestran que las mezcla m7 encontrada experimentalmente presenta mejores características en el proceso de cocción por lo que se estableció una curva de cocción óptima para la fabricación del bloque H-10 teniendo en cuenta las especificaciones del proceso productivo y la materia prima, con lo que se espera mejorar la calidad del producto final cumpliendo las especificaciones de las normas actuales vigentes. Es indispensable caracterizar las arcillas para optimizar la pasta de producción y evitar imperfecciones en el producto final (Bloque H-10) con lo que evidentemente se mejoraran los recursos ambientales y económicos de la empresa.

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CFD performance analysis for Darrieus Hydrokinetic Turbine
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Rolong Ortiz, Humberto | 2019-04-10

This work proposes the analysis of the behavior of a Darrieus type hydrokinetic turbine, starting from the mathematical model that allows to delimit the operation system, linking all the variables present in the phenomenon, specifically the fluid properties such as density, velocity, viscosity and Reynolds number. Also considered are the geometric data of the profiles, the rope length, cross-sectional area, angle of attack of the impeller, type of profile used and speed of rotation. The initial domain data, the flow area and the boundary conditions are selected to solve the model and thus obtain the data of the individual behavior of the selected profiles. For this, the lift and drag curves are obtained over a wide range of angles of attack. After characterizing the profile, the behavior of the impeller is simulated, calculating its power coefficient and consequently its performance.

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Clay surface characteristics using atomic force microscopy
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Acevedo Peñaloza, Carlos Humberto | 2018-06-07

The first component for the manufacture of masonry products used in construction is clay, which provides the plasticity that facilitates the molding and handling of the product. The second component is the feldspar in form of alumina (Al2O3) which is used as flux. The third one is silica (SiO2) which is used as a filling material and stabilizer. These elements are determined by chemical composition using fluorescence analysis or X-ray diffraction, which is the basis of the modern classification of minerals. Thereby, the main objective of this research is to study the surface characteristics of clay samples from an industrial company producing H-10 blocks in the region of Norte de Santander, by studying the surfaces of the samples selected through the analysis by Atomic Force Microscopy, in order to compare the results with those found in the literature, and at the same time taking into account the chemical elements in their highest composition. The results show that this is a technique that allows the identification of clay components, thus validating what has been found in physical and chemical analysis, expecting to provide a scientific contribution by AFM, because there is little information related to the characterization topography of clay materials.

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Combustion and performance study of low-displacement compression ignition engines operating with Diesel–Biodiesel blends
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Valencia, Guillermo | 2020-01-30

This study investigated the influence of different biodiesel blends produced from residual sunflower oil and palm oil from agroindustry liquid waste on the characteristics of the combustion process, performance, and emissions in a single-cylinder diesel engine. For the analysis of the combustion process, a diagnostic model was developed based on the cylinder pressure signal, which allows the calculation of the heat release rate, the accumulated heat rate, and the temperature in the combustion chamber. This is to assess the influence of these parameters on engine emissions. The experiments on the diesel engine were carried out using five types of fuel: conventional diesel, two biodiesel blends of residual palm oil (PB5 and PB10), and two biodiesel blends formed with palm oil and sunflower oil residues (PB5SB5 and PB10SB5). The engine was running in four different modes, which covered its entire operating area. Experimental results show that the in-cylinder pressure curves decrease as the percentage of biodiesel in the fuel increases. Similarly, the results showed a decrease in the heat release rate for biodiesel blends. The diagrams of the accumulated heat release curves were larger for fuels with higher biodiesel content. This effect is reflected in the thermal efficiency of biodiesel blends since the maximum thermal efficiencies were 29.4%, 30%, 30.6%, 31.2%, and 31.8% for PB10SB5, PB5SB5, PB10, PB5, and diesel, respectively. The emission analysis showed that the blends of biodiesel PB5SB5 and PB10SB allowed a greater reduction in the emissions of CO, CO2, HC, and opacity of smoke in all the modes of operation tested, in comparison with the blends of biodiesel PB5 and PB10. However, NOx emissions increased. In general, biodiesel with the percentage of residual sunflower oil does not cause a significant change in the combustion process and engine performance, when compared to biodiesel that includes only residual palm oil.

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A comparative study of the cutting parameter in milling process under different material
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Acevedo Peñaloza, Carlos Humberto | 2018-06-18

In the present study, the incidence of the variation in feed rate per tooth and depth of cut for SAE 4340 alloy steel and SAE J431 steel castings was analysed and in which material this variation is most noticeable. For this purpose, the machining process studied was milling. This is a machining operation in which a workpiece is passed in front of a rotating cylindrical tool with multiple cutting edges. For this study, the feed rate per tooth and depth of cut were varied by 4 values each. The feed rate ranged from 0.002 mm to 0.008 mm and the depth of 2 mm to 8 mm found that for both parameter variations cutting speeds always decrease with increasing both feed per tooth and depth of cut and that feed per tooth and depth of cut significantly affect process costs.

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Comparison of the radius of curvature in the cams which used in the displacement law beziér curves and cyclic and harmonic curves
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Acevedo Peñaloza, Carlos Humberto | 2018-11-07

The work shows the radius of curvature for different variations of the angle of rotation β and of the ratio of Ro/L, the study is shown for the case in which the laws of displacement of the cams have been designed by Bézier curves and these results are compared with those obtained by harmonic and cyclic curves.

LEER
Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software
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Cárdenas-Gutiérrez, Javier Alfonso | 2020-10

The heat exchangers application in combined cycle power plants is a key aspect in the thermal and fluid mechanics sciences due to their elevated functionality in industrial processes related to the quality and the efficiency in the power generation. Heat exchangers are employed in thermal processes in order to remove a significant heat flow and to maintain temperature values under different working conditions. Taking into account the above, numerical methodologies have been developed with the aim to study and analyze the heat exchanger performance based on the thermal states of its physical values in space and time. Experimental methods may be applied to create models and describe the flow behavior in function of mass flow rate, pressure, and flow temperature in different measure points of the finite volume. However, it is necessary to apply numerical methods linked to computational tools in order to generate a high flow description into the heat exchanger under real working conditions. Therefore, this paper proposes a numerical analysis of the flow transported into a heat exchanger with computational tools to predict its performance under real Combined Cycle Power Plant conditions through a virtual environment. Random number generator KEpsilon turbulence model and Eulerian – Eulerian multiphase model is coupled in a Computational Fluid Dynamics code to solve the system of the partial differential equations which describes the flow behavior and heat transfer into the heat exchanger, and numerical results have been compared against the experimental model in order to verify the flow prediction of the simulation methodology employed in this particular case. The good agreement reached between the models defines an inexpensive way to evaluate and optimize the heat exchanger performance by means of OpenFOAM software.

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