Mostrando ítems 21-27 de 27

Regenerative organic rankine cycle as bottoming cycle of an industrial gas engine traditional and advanced exergetic analysis

Cárdenas-Gutiérrez, Javier Alfonso; Valencia Ochoa, Guillermo; Duarte Forero, Jorge (Applied SciencesSuiza, 2020-06-27)

This investigation shows a traditional and advanced exergetic assessment of a waste heat recovery system based on recuperative ORC (organic Rankine cycle) as bottoming cycle of a 2 MW natural gas internal combustion engine. ...
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 ...
Scientometric analysis of research on eSports from 2007 to 2017

Camargo Vanegas, Josué; Cárdenas-Gutiérrez, Javier Alfonso; Valencia Ochoa, Guillermo (Contemporary Engineering SciencesBulgaria, 2018-08-30)

A scientometric analysis about eSports publications from 2007 to 2017 was carried out. HistCite was used to analyze the data collected from Web of Science during the period mentioned. The results suggest that eSports ...
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 ...
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. ...
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 ...
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 ...

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Regenerative organic rankine cycle as bottoming cycle of an industrial gas engine traditional and advanced exergetic analysis
...
Cárdenas-Gutiérrez, Javier Alfonso | 2020-06-27

This investigation shows a traditional and advanced exergetic assessment of a waste heat recovery system based on recuperative ORC (organic Rankine cycle) as bottoming cycle of a 2 MW natural gas internal combustion engine. The advanced exergetic evaluation divides the study into two groups, the avoidable and unavoidable group and the endogenous and exogenous group. The first group provides information on the efficiency improvement potential of the components, and the second group determines the interaction between the components. A sensitivity analysis was achieved to assess the effect of condensing temperature, evaporator pinch, and pressure ratio with net power, thermal efficiencies, and exergetic efficiency for pentane, hexane, and octane as organic working fluids, where pentane obtained better energy and exergetic results. Furthermore, an advanced exergetic analysis showed that the components that had possibilities of improvement were the evaporator (19.14 kW) and the turbine (8.35 kW). Therefore, through the application of advanced exergetic analysis, strategies and opportunities for growth in the thermodynamic performance of the system can be identified through the avoidable percentage of destruction of exergy in components.

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Regenerative reassembly phenomenon in the turning process machining the A1020 steel
...
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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Scientometric analysis of research on eSports from 2007 to 2017
...
Camargo Vanegas, Josué | 2018-08-30

A scientometric analysis about eSports publications from 2007 to 2017 was carried out. HistCite was used to analyze the data collected from Web of Science during the period mentioned. The results suggest that eSports research has increased during the 11 years of study; the country with the highest number of publications was the United States of America, with eight institutions predominant in the number of publications. Most of the articles and the highest local score of total citations come from countries where eSports are considered sport; the top three journals with the most publications were International Journal of Gaming and Computer-Mediated Simulations, Games and Culture and Psychology of Sport and Exercise, where the top three journals with the highest TLCS are Games and Culture, New Media & Society and Computers in Human Behavior.

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A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine
...
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.

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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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Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels
...
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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Theoretical modeling of a steam power cycle using an interactive computational tool
...
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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Listar por autor "Valencia Ochoa, Guillermo"

Regenerative organic rankine cycle as bottoming cycle of an industrial gas engine traditional and advanced exergetic analysis

Regenerative reassembly phenomenon in the turning process machining the A1020 steel

Scientometric analysis of research on eSports from 2007 to 2017

A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine

Study of the emissions in the diesel engines: A review

Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels

Theoretical modeling of a steam power cycle using an interactive computational tool

Envíos recientes

Regenerative organic rankine cycle as bottoming cycle of an industrial gas engine traditional and advanced exergetic analysis

Regenerative reassembly phenomenon in the turning process machining the A1020 steel

Scientometric analysis of research on eSports from 2007 to 2017

A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine

Study of the emissions in the diesel engines: A review

Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels

Theoretical modeling of a steam power cycle using an interactive computational tool

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Listar por autor "Valencia Ochoa, Guillermo"

Regenerative organic rankine cycle as bottoming cycle of an industrial gas engine traditional and advanced exergetic analysis ﻿

Regenerative reassembly phenomenon in the turning process machining the A1020 steel ﻿

Scientometric analysis of research on eSports from 2007 to 2017 ﻿

A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine ﻿

Study of the emissions in the diesel engines: A review ﻿

Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels ﻿

Theoretical modeling of a steam power cycle using an interactive computational tool ﻿

Envíos recientes

Regenerative organic rankine cycle as bottoming cycle of an industrial gas engine traditional and advanced exergetic analysis

Regenerative reassembly phenomenon in the turning process machining the A1020 steel

Scientometric analysis of research on eSports from 2007 to 2017

A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine

Study of the emissions in the diesel engines: A review

Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels

Theoretical modeling of a steam power cycle using an interactive computational tool

Portales Institucionales

Regenerative organic rankine cycle as bottoming cycle of an industrial gas engine traditional and advanced exergetic analysis

Regenerative reassembly phenomenon in the turning process machining the A1020 steel

Scientometric analysis of research on eSports from 2007 to 2017

A Semi-Physical Modeling of the Combustion Chamber and Inlet Manifold of a 2 MW Natural Gas Generation Engine

Study of the emissions in the diesel engines: A review

Technical-economic study of the feed per tooth influence in a cylindrical milling process of alloyed steels

Theoretical modeling of a steam power cycle using an interactive computational tool