Mostrando ítems 62-81 de 87

PEST analysis of a rankine organic cycle for energy recovery

Valencia Ochoa, Guillermo; Acevedo Peñaloza, Carlos Humberto; Mendoza-Casseres, Daniel (International Journal of Applied Engineering ResearchIndia, 2018)

In this work is presented a state of the art of political and economic investments, technological developments, social and environmental impacts of the 4 countries that contribute more research on the Organic Rankine ...
PEST analysis of wind energy in the world: From the worldwide boom to the emergent in Colombia

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

This article presents the analysis of the political, economic, social and technological aspects of the countries with the greatest development and generation of wind energy in the world, with the aim of studying the successes ...
Principal stresses on the contact surface of a cam-tracker mechanism designed using Bézier curves

Acevedo Peñaloza, Carlos Humberto; Henao Leon, Diego; Prada Botia, Gaudy Carolina (Contemporary Engineering SciencesBulgaria, 2018-11-29)

The study exposes the variation of the main stresses in a cam mechanism with roller follower whose profile has been designed by means of Bézier curves. The contact theory for the cam case is proposed and the distribution ...
Probability parameters and estimated firestone abbott plateau honing curves

Coba Salcedo, Milton Fabian; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (Contemporary Engineering SciencesBulgaria, 2018-09-12)

This paper developed a methodology for estimating Abbott-Firestone curves from the roughness parameters of the material probability curves. The surface roughness profile obtained in plateau-honing processes is the ...
Regenerative chatter Phenomenon in the Turning Process based on the alloy steels 1020, 1035 and 1045

Coba Salcedo, Milton Fabian; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (International Journal of ChemTech ResearchIndia, 2018)

Regenerative vibration is a major drawback in machining processes reducing the geometric accuracy and dynamic stability of the cutting system. Achieving a dynamically stable cutting operation represents a significant ...
Regenerative reassembly phenomenon in the turning process machining the A1020 steel

Coba Salcedo, Milton Fabian; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (Contemporary Engineering SciencesBulgaria, 2018-08-01)

The chattering in the machine tools is a phenomenon that causes instability in the machining process, surface finish with high roughness, also produces excessive and accelerated wear on the tool in the metal cutting ...
Research evolution on renewable energies resources from 2007 to 2017: a comparative study on solar, geothermal, wind and biomass energy

Valencia, Guillermo; Núñez Alvarez, José Ricardo; Acevedo Peñaloza, Carlos Humberto (International Journal of Energy Economics and PolicyTurquía, 2019-08-20)

This article presents a bibliometric analysis of trends and the research state on the main renewable energies based on information obtained from the SCIE / SSCI database for the period 2007-2017. The analysis is aimed at ...
Scientometric analysis of research on emissions control from 2007 to 2017

Acevedo Peñaloza, Carlos Humberto; Valencia, Guillermo; Cardenas Escorcia, Yulineth; Quiñones, Diego H.; Camargo Vanegas, Josué (International Journal of Applied Engineering ResearchColombia, 2018-01)

A scientometric analysis of the production of scientific publications on emissions control from 2007 to 2017 was carried out. HistCite was used to analyze information collected from Web of Science (WoS) on this topic during ...
A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine

Valencia Ochoa, Guillermo; Duarte Forero, Jorge; Acevedo Peñaloza, Carlos Humberto (International Review on Modelling and SimulationsItalia, 2020-02)

This article presents a sensitivity analysis based on a validated model of average value in natural gas generation engines under the phenomenologically based semi-physical modeling methodology, which includes both the ...
Shaft pump power - effect of pipe network configuration

Obregon, Luis; Espinel Blanco, Edwin; Acevedo Peñaloza, Carlos Humberto (International Journal on Energy ConversionItalia, 2020-05)

Building design has often many engineering challenges to achieve the best possible energy and economic efficiencies. It is necessary to use technological tools capable of predicting with a high degree of accuracy the ...
Study of the emissions in the diesel engines: A review

Duarte Forero, Jorge; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (Contemporary Engineering SciencesBulgaria, 2018-09-12)

Diesel engines are one of the main sources to supply the rapid growth of energy consumption worldwide. They have been widely used in the public and commercial transport sector due to their greater durability and efficiency. ...
Study of the fire decomposition behavior of recycled polyethylene terephthalate (RPET) with the addition of MCA additive retardant

Prada Botia, Gaudy Carolina; Acevedo Peñaloza, Carlos Humberto; Orjuela Abril, Martha Sofia (Journal of Physics: Conference SeriesReino Unido, 2018-12-07)

Polyethylene terephthalate (PET) currently occupies an important space in the manufacture of bottles for carbonated beverages and mineral water, however, its use has become another pollution problem in the world, due to ...
Study of the influence of the honing process by plastic deformation on the turning of AISI 1045steel

Coba Salcedo, Milton Fabian; Rojas Suárez, Jhan Piero; Acevedo Peñaloza, Carlos Humberto (Contemporary Engineering SciencesBulgaria, 2018-09-18)

Burnishing is a machining process without chip removal that seeks to improve the surface roughness of a component by means of plastic deformation of the surface layers. Due to the process mechanics, during its execution, ...
Substitution of natural stony material aggregates in conventional 17.5 mpa non-structural concrete mixtures by means of percentage addition of hospital solid waste

Hurtado-Figueroa, Oswaldo; Cárdenas-Gutiérrez, Javier Alfonso; Acevedo Peñaloza, Carlos Humberto (Contemporary Engineering SciencesBulgaria, 2018-11-29)

An experimental character research was carried out. A conventional concrete mixture was made with the mechanical resistance to compression of 17.5 Mpa. The materials used in the concrete mixture were analyzed and selected ...
Sustainability under research in green energy: A bibliometric study

Coba Salcedo, Milton Fabian; Valencia Ochoa, Guillermo Eliecer; Acevedo Peñaloza, Carlos Humberto (International Journal of ChemTech ResearchIndia, 2018)

The reduction of the amount of pollution and toxicity by the manufacture of products has been a topic widely investigated by many international organizations, looking for an answer that help humanity to minimize the ...
A systematic procedure to combine the integral management systems in a services sector company

Cardenas Escorcia, Yulineth; Acevedo Peñaloza, Carlos Humberto; VALENCIA OCHOA, GUILLERMO ELIECER (Chemical Engineering TransactionsItalia, 2018)

Nowadays, the companies with national leadership have decided to provide services that allow the industries to give solutions for manufacturing, repair, reconstruction, maintenance and supply to the necessary tools necessary ...
Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels

Coba Salcedo, Milton Fabian; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (International Journal of Engineering and TechnologyIndia, 2018-07)

The economy of the machining process is an important point that has been given attention since the beginning of the process. For this reason, this study focuses on the evaluation of the performance of the cylindrical ...
Techno-economic analysis of on-grid biomass renewable energy power station: A case study in Caribbean region of Colombia

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

In this article a techno-economic study of an Electric-Biomass on-grid power plant is presented, in order to compare the performance and the operating annual cost under some types of biogas produced from poultry, bovine ...
Theoretical modeling of a steam power cycle using an interactive computational tool

Lizarazo Bohórquez, Cristina; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (International Journal of Engineering and TechnologyIndia, 2018-07)

This paper presentsan energetic and exergetic analysis for ageneration of turbine work according to the variation of the pressure in the condenser regenerative Rankine cycle, implementing an educational graphical user ...
Thermal analysis of the heat exchanger used in a regenerative Brayton cycle under real working conditions

Acevedo Peñaloza, Carlos Humberto; Valencia, Guillermo; Duarte Forero, Jorge (International Review on Modelling and SimulationsItalia, 2019-12)

The quality of the energy transformation processes focuses on improving the energy efficiency of the components used in a thermodynamic cycle with the aim to upgrade the application of the resources needed to produce energy ...

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PEST analysis of a rankine organic cycle for energy recovery
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Valencia Ochoa, Guillermo | 2018

In this work is presented a state of the art of political and economic investments, technological developments, social and environmental impacts of the 4 countries that contribute more research on the Organic Rankine Cycles (ORC) from the application of PEST analysis. Taking into account that technologies for waste heat recovery such as ORCs have been very popular due to their friendly impact on the environment. Countries such as the People's Republic of China are carrying out a large number of research projects on ORCs with industrial applications, and their policies are in line with the need to reduce greenhouse gas emissions, as evidenced by the Top-1000 Energy-Consuming Enterprises program, which seeks to optimize the systems of the country's main production companies.

LEER
PEST analysis of wind energy in the world: From the worldwide boom to the emergent in Colombia
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Acevedo Peñaloza, Carlos Humberto | 2018-12-07

This article presents the analysis of the political, economic, social and technological aspects of the countries with the greatest development and generation of wind energy in the world, with the aim of studying the successes and disadvantages over the years and serve as a reference to a country like Colombia, which is in full technological development and is very interested in investing in new alternatives to the imminent ecological disaster resulting from polluting emissions. Colombia signs the Paris Agreement and immediately creates a large number of opportunities supported by state policies and economic investment, specifically in the construction of wind farms that guarantee a real alternative to the country's energy demand. Wind energy supplies 5% of the world's electricity, a contribution in which countries such as the United States, China, and Germany are the main producers. For this reason, it is necessary to study and analyze the factors that prevent the technological development of wind energy in Colombia, if it is considered a country with abundant resources in renewable energy sources and zero cost, a country that aspires to be a protagonist in the next 5 years according to the Ministry of Mines and Energy.

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Principal stresses on the contact surface of a cam-tracker mechanism designed using Bézier curves
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Acevedo Peñaloza, Carlos Humberto | 2018-11-29

The study exposes the variation of the main stresses in a cam mechanism with roller follower whose profile has been designed by means of Bézier curves. The contact theory for the cam case is proposed and the distribution of the stresses throughout the cam turning cycle is presented, applied to an established study model.

LEER
Probability parameters and estimated firestone abbott plateau honing curves
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Coba Salcedo, Milton Fabian | 2018-09-12

This paper developed a methodology for estimating Abbott-Firestone curves from the roughness parameters of the material probability curves. The surface roughness profile obtained in plateau-honing processes is the superposition of the effects of the two processes used to generate it. At first, a honing is performed with which the characteristics of valleys are generated, honing base, and after this honing base, a finishing honing is performed, a plateau operation to reduce the peaks of the base honing profile without modifying the characteristics of the valleys of the base profile. In the functional behaviour of the surface, the valleys will contribute to the retention of oil and the flat areas will contribute to reducing friction with the oil retained in the valleys and to improving watertightness. To characterize this type of roughness obtained by the superposition of the roughness generated by two processes, material probability curves are suitable, in which the roughness of each process is characterized by the slope of a line, and the point of intersection of both lines corresponds to the transition zone between plateaus and valleys. The roughness parameters other than those of the probability curve do not adequately characterize the roughness obtained by processes such as plateauhoning, since they are calculated on the total height of the roughness profile and do not separate the effects of the processes that have been used to obtain it, which means that the contribution of each of the processes to the roughness profile cannot be differentiated.

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Regenerative chatter Phenomenon in the Turning Process based on the alloy steels 1020, 1035 and 1045
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Coba Salcedo, Milton Fabian | 2018

Regenerative vibration is a major drawback in machining processes reducing the geometric accuracy and dynamic stability of the cutting system. Achieving a dynamically stable cutting operation represents a significant decrease in the production time and therefore in the costs associated with this process. The information provided by the stability lobe diagrams is of great importance, since from them we know the range of spindle rotation speeds and chip thicknesses at which the cutting operation takes place in a state free from the phenomenon of regenerative chatter, avoiding the rapid wear of the cutting tool and achieving quality surface finishes. In the present investigation, the behavior of the turning operations in steel 1020, steel 1035 and steel 1045 is characterized, with the objective of verifying the presence of instability in the machining caused by the regenerative chattering in the machine tools. Based on the analytical models proposed by Altintas and Budak for the stabilization of self-excited vibrations, a computer tool is developed capable of generating stability lobe diagrams, which allow us to appreciate the operating conditions in which machining presents stable behavior, to simulate the material removal process considering certain parameters specific to the machine tool.

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Regenerative reassembly phenomenon in the turning process machining the A1020 steel
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Coba Salcedo, Milton Fabian | 2018-08-01

The chattering in the machine tools is a phenomenon that causes instability in the machining process, surface finish with high roughness, also produces excessive and accelerated wear on the tool in the metal cutting processes, this phenomenon consists of self-excited vibrations which are produced and maintained due to the cutting forces, the purpose of this article is to analyze regenerative chatter and predict the optimal points of operation in the turning process for 1020 carbon steel by developing analytical methods for generating stability lobe diagrams. To achieve this objective, the methods proposed by Altinas and Budak to stabilize the self-excited vibrations in the turning process applied to the orthogonal cut were studied in detail. These methods are widely accepted within the community of researchers and specialists in the field, thanks to the excellent results obtained in practice. Once the models studied were compressed, a computational algorithm was developed with the help of the MATLAB® software that was able to generate stability lobe diagrams for the turning operation in order to find the optimal points of operation so that there was no chatter, thus improving the material removal rate and increasing productivity

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Research evolution on renewable energies resources from 2007 to 2017: a comparative study on solar, geothermal, wind and biomass energy
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Valencia, Guillermo | 2019-08-20

This article presents a bibliometric analysis of trends and the research state on the main renewable energies based on information obtained from the SCIE / SSCI database for the period 2007-2017. The analysis is aimed at solar energy, geothermal energy, wind energy and biomass energy source. The results generated from the bibliometric techniques used allowed to obtain the behavior of the publications production and the influence that different countries and universities have on this subject. From the 10,363 publications, the 87.5% are journal articles and the 98% are in English language. In addition, 49.03% of the publications corresponded to solar energy, 33.83% to wind energy, 12.77% to biomass and 4.37% to geothermal energy. In the ten years analyzed, the United States has been the most influential country in this research area, presenting the largest volume of publications in each of the renewable energies source studied. The results of this paper provide to energy researchers a relevant overview of the tendencies and scope of the main renewable energies worldwide. In addition, to support scientific decision and prospective investment in research center, relevant data are presented on the countries producing these renewable energies and their relationship with the production of publications.

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Scientometric analysis of research on emissions control from 2007 to 2017
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Acevedo Peñaloza, Carlos Humberto | 2018-01

A scientometric analysis of the production of scientific publications on emissions control from 2007 to 2017 was carried out. HistCite was used to analyze information collected from Web of Science (WoS) on this topic during this period. The results suggest that scientific publications in this field have steadily increased over the years during the last decade. China is the country with the highest number of publications, and the Chinese Academy of Sciences represents the institution with the highest number of publications. Most of the papers and citations came from developed countries. The top three journals with highest number of papers in this field are Applied Physics Letter, Atmospheric Environment, and Environmental Science & Technology.

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A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine
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Valencia Ochoa, Guillermo | 2020-02

This article presents a sensitivity analysis based on a validated model of average value in natural gas generation engines under the phenomenologically based semi-physical modeling methodology, which includes both the cylinder, exhaust, and intake manifold and it can define the average operational variables and thermochemical properties of exhaust gases as a function of the variables instrumented in this type of engine at the industrial level. The results for a month of operation showed errors no greater than 5% in the temperature at the entrance of the cylinders (Temperature 6), while the power, load temperature and load pressure of the model presented deviations of less than 2% from the measured data. Additionally, the results of the sensitivity analysis evidenced that the main variable affecting most of the parameters under study is the flow of gas entering the engine, which causes a variation of 12.3% in Temperature 6, and 22.4% in electrical power. Next, the second most influential variable is Lambda, significantly affecting the efficiency by 8%. Finally, there is the RPM of the engine in its work cycle, which affects the temperature of the cylinder outlet by 34.5%. This means that when the flow of fuel in the engine decreases, there will be significant operational changes in the engine, and therefore in the thermal availability of exhaust gases.

LEER
Shaft pump power - effect of pipe network configuration
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Obregon, Luis | 2020-05

Building design has often many engineering challenges to achieve the best possible energy and economic efficiencies. It is necessary to use technological tools capable of predicting with a high degree of accuracy the behavior of a pipe network system in order to obtain good designs that avoid problems in the future. This study is focused on the analysis of three pipe networks with different floors and the same configuration on each level. Four case studies have been developed in order to analyze the energy requirements and the outlet pressure of a pump for multiple pipe diameters, various floors, and fluid flow rates. The effects of the pipe diameter and the flow rate on the energy cost have been also analyzed. It has been observed that an increase in the flow rate in a pipeline of one inch of diameter causes a huge increase in the pump power when working on the net with a single floor. In addition, it has been found out that the higher the number of the floors is, the higher the pump powder is. However, this effect has not been significant when using pipelines with high diameters. Besides, it has been found out that the higher the number of the floors is, the higher the pressure drop in the system is. This effect is highly significant when using pipelines with small diameters. The total pump power cost had an exponential decay with the increase in pipe diameter.

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Study of the emissions in the diesel engines: A review
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Duarte Forero, Jorge | 2018-09-12

Diesel engines are one of the main sources to supply the rapid growth of energy consumption worldwide. They have been widely used in the public and commercial transport sector due to their greater durability and efficiency. The current study in Diesel engines is focused on emissions from exhaust gases, as they are causing problems in human health and the ecosystem, because they contain dangerous substances, such as organic carbon, trace elements, elemental carbon and inorganic ions. In this paper, we study the different investigations on pollutant emissions in engines, focused on the mechanisms of formation of pollutants, the techniques to reduce these emissions and how they affect human health. With this, it will be possible to project the necessary improvements in this type of systems, to reduce the impact of these thermal machines on the environment.

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Study of the fire decomposition behavior of recycled polyethylene terephthalate (RPET) with the addition of MCA additive retardant
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Prada Botia, Gaudy Carolina | 2018-12-07

Polyethylene terephthalate (PET) currently occupies an important space in the manufacture of bottles for carbonated beverages and mineral water, however, its use has become another pollution problem in the world, due to the fact that most of them end up in landfills, increasing the volume of plastics waste. The present investigation focuses on the analysis of recycled polyethylene terephthalate (RPET) analyzing whether it is possible to modify the thermal behavior of this plastic, by adding flame retardant, with the aim of improving its thermal properties. The thermal properties of the mixture and the degradation were evaluated by thermogravimetric analysis (TGA) and Dynamic Thermal Analysis (DTA), characterizing its decomposition process in increase of temperature, showing the little variation of the behavior of the mixture of RPET and % of MCA as a flame retardant additive compared to virgin PET.

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Study of the influence of the honing process by plastic deformation on the turning of AISI 1045steel
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Coba Salcedo, Milton Fabian | 2018-09-18

Burnishing is a machining process without chip removal that seeks to improve the surface roughness of a component by means of plastic deformation of the surface layers. Due to the process mechanics, during its execution, a compressive residual stress is introduced into the surface of the workpiece during its execution, which improves various physical-mechanical properties of the component. This process has been used industrially since the 1950s, mainly in pieces made of soft materials (hardnesses up to 45 HRC), in operations subsequent to processes such as turning. The development of tools with harder materials, has opened up the possibility of burnishing on harder materials (hardnesses up to 62 HRC). Burnishing of hard materials has opened up an alternative to traditional finishing processes such as grinding, its main comparative advantage is its low-cost operation, which reduces grinding costs by 8 to 15 times. The plastic deformation burnishing is a metal working process with material removal whose advantages are that it does not generate waste, which is a competitive advantage over other surface finishing processes such as grinding, where waste is generated which also needs to be collected and subsequently treated. The use of e.g. coolants is not necessary either, in recent years, attempts have been made to eliminate them from material working processes, because their presence not only causes a significant cost that impacts the manufacturing process, also represents an environmental problem due to its polluting effect, with the associated management costs involved. This article presents the results of an AISI 1045 test specimen experiment, to which a turning process has previously been carried out.

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Substitution of natural stony material aggregates in conventional 17.5 mpa non-structural concrete mixtures by means of percentage addition of hospital solid waste
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Hurtado-Figueroa, Oswaldo | 2018-11-29

An experimental character research was carried out. A conventional concrete mixture was made with the mechanical resistance to compression of 17.5 Mpa. The materials used in the concrete mixture were analyzed and selected based on the parameters established in the Colombian Technical Standards and the ASTM International Standards. They were made 6 test cylinders with the mentioned concrete mixture to which, the compressive strength of the concrete was checked it, 3 of them 7 days after they were made and the rest of them 28 days later, respectively. Thereafter, their drying process by immersion, the data thrown by the tests were averaged and tabulated. The Hospital waste solid incinerated and treated by Ecosteryl machine which is located at Guayabal environmental technology park in Cucuta city was collected. The material resulting from the incineration and treatment of the hospital solid waste was selected taking only the particles equal to or less than 20mm resulting from the crushing process by Ecosteryl. With the selected Particulate material, 3 experimental mix designs were made, which 2.5, 5 and 7.5% of the total weight of the natural stone aggregates present in the conventional concrete mixture was replaced. With each experimental mixture made, 6 cylinders were tested at 7 and 28 days, a process carried out in the same way as that implemented in the conventional concrete mix for both tests and data collection and analysis. The comparative tables showed that the experimental mixture I, where 2.5% of the total weight of the aggregate of the conventional concrete mixture was replaced, was the one that obtained the highest compressive strength surpassing the result of the conventional concrete mixture.

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Sustainability under research in green energy: A bibliometric study
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Coba Salcedo, Milton Fabian | 2018

The reduction of the amount of pollution and toxicity by the manufacture of products has been a topic widely investigated by many international organizations, looking for an answer that help humanity to minimize the environmental impact. The main objective of this paper is to study the literature of Green engineering from 2007 to 2017 using bibliometric techniques for obtaining an overview of the production behavior of publications in this topic. The information was discharged and analyzed using tools such as Web of Science (WOS) and HistCite to get important results of the international contribution developing significant advances in this area. According to the results obtained, USA has been the most important country researching in this subject, providing 36.8% of the total publications. From the 257 publications, 60.9% were journal articles, where the Abstracts of papers of the American Chemical Society was the most relevant journal with 14 papers. Between 2014 and 2017 an important increase in the published production was presented, being 2016 the year with the most papers published with 15.6% of total investigations. In recent years, green engineering has been consider in many process on industries as a key tool to help the control of the greenhouse emissions, reducing the environmental impact providing some steps to achieve goals proposed for 2050 according to the ISO 50001 standard.Introducción.

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A systematic procedure to combine the integral management systems in a services sector company
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Cardenas Escorcia, Yulineth | 2018

Nowadays, the companies with national leadership have decided to provide services that allow the industries to give solutions for manufacturing, repair, reconstruction, maintenance and supply to the necessary tools necessary for the operation of the machinery required in the development of projects. The objective of this work is based on the identification of the relationship and points of convergence between the ISO 9001:2015, ISO 14001:2015, ISO 50001:2011, and OHSAS 18001:2007 standards, for the implementation of the IMS- HSE (Integrated Management System and Health, Safety and the Environment respectively), in companies in the metal-mechanical sector that develop their economic activity in Colombia. An analysis of the regulatory structure was conducted, identifying common and no n-common aspects to find a compliance baseline that provides business leaders with a decision-making tool for implementing Geographical Information System (GIS) and HSE aimed at continuous improvement. The re sult of this research offers a characterization regarding scope, planning, performance evaluation and development in legal terms, applied to the systems integrated into the service company in the metal-mechan ical sector. So that, the results can be used as an operational and organizational tool that provides them with a characterist ic of viability, competitiveness, and profitability compared to companies in the same dynamic scenario, guaranteeing compliance with the legal commitments of the Colombian regulatory framework.

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Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels
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Coba Salcedo, Milton Fabian | 2018-07

The economy of the machining process is an important point that has been given attention since the beginning of the process. For this reason, this study focuses on the evaluation of the performance of the cylindrical milling process, varying the feed rate per tooth for the operating conditions proposed in the revised case study. This was done using a calculation algorithm in which the fixed parameters were entered and the feed per tooth was varied. Finding benefits in terms of cutting speed, feed speed, cutting time and more. Increased feed per tooth resulted in lower process costs.

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Techno-economic analysis of on-grid biomass renewable energy power station: A case study in Caribbean region of Colombia
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VALENCIA OCHOA, GUILLERMO ELIECER | 2018-12-07

In this article a techno-economic study of an Electric-Biomass on-grid power plant is presented, in order to compare the performance and the operating annual cost under some types of biogas produced from poultry, bovine and porcine manure, and solid urban organic waste, using the Homer® software to develop many solutions. Certainly, the best set up had the maximum combined renewable energy with a minimum electric consumption from the grid. The scheme was integrated by two 500kW biogas-powered electric generator on grid to supply an average energy of 1401.6kW, with an annual operating cost of $2.09 million when the energy supply is electric. Results presented a significant operational cost reduction when the biogas generator is operating on grid, finding an 8.61% of cost decrease using biogas generated from poultry, bovine and porcine manure, and a 10.53% of cost decrease using biogas from solid urban organic waste from centers and grocery market places at Caribbean Region of Colombia.

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Theoretical modeling of a steam power cycle using an interactive computational tool
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Lizarazo Bohórquez, Cristina | 2018-07

This paper presentsan energetic and exergetic analysis for ageneration of turbine work according to the variation of the pressure in the condenser regenerative Rankine cycle, implementing an educational graphical user interface known as Power Cycle version 2.0; that is used as a pedagogical strategy in thefield ofengineering education. The mains objectives were, analyzethe efficiency of first and second thermodynamic law, and the generation of turbine work according to the variation of thecondenser pressure, at three different temperatures in the boiler, as well as analyzing the components of the system to identify and quantify where the exergy destruction was maximum. According to the results in the cases studied, the percentage ratio of the exergydestruction to the total exergy destruction was found to be maximum in the boiler 62.18%, then the turbine 22.79%, and finally 15.03% in the pumps, the heater and the condenser. On the other hand, the maximum calculated thermal efficiency was 38.34%, while the maximum exergetic efficiency was 62.81%. A significant increase in efficiency of the cycle is obtained by decreasing the pressure in the condenser.

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Thermal analysis of the heat exchanger used in a regenerative Brayton cycle under real working conditions
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Acevedo Peñaloza, Carlos Humberto | 2019-12

The quality of the energy transformation processes focuses on improving the energy efficiency of the components used in a thermodynamic cycle with the aim to upgrade the application of the resources needed to produce energy in power generation plants. Due to the great importance of thermal analysis in the kinetic energy transformation of a fluid into electrical energy through combined Rankie cycles applied on industrial processes, this paper proposes an energetic and exergetic analysis of a heat exchanger used as a steam surface condenser with the aim to reduce the fuel consumption used by a steam turbine and to establish parameters that define the performance of the shell and tube heat exchanger using computational tools of thermal analysis. An experimental model has been used to validate the numerical analysis developed in a virtual environment. MATLAB software has been used as a numerical tool to develop the matrix manipulations written in .m code that define the thermal analysis of the equations that describe the behavior of the combined regenerative Rankine cycle power plant. Numerical data generated in the numerical model with MATLAB has been compared with the experimental model of the steam surface condenser. A good agreement has been reached between the CFD analysis and the experimental model of the steam surface condenser.

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