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Dive into the research topics where José Antonio Velásquez is active.

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Featured researches published by José Antonio Velásquez.


International Journal of Exergy | 2004

Exergoeconomic optimisation of a Kalina cycle for power generation

José A. Borgert; José Antonio Velásquez

It is shown that the use of an ammonia-water Kalina absorption power cycle as a bottoming cycle for a cogeneration plant may result in an economic advantage. This cycle was optimised using as a goal function the exergoeconomic unitary cost of the electricity produced by both the cogeneration plant and the absorption cycle. The Zoutendijk method of feasible directions was used for this optimisation. The results obtained show that the generated net power increases in 3.26% and the unitary cost of electricity diminishes in 3.14%.


International Journal of Vehicle Design | 2009

Effect of soybean oil ethyl ester/diesel fuel blends on engine efficiency

Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez

Variation of engine thermal efficiency in response to the addition of soybean oil ethyl ester to diesel fuel was analysed in terms of the in-cylinder phenomena and fuel properties. Blends with concentrations of up to 30% of soybean oil ethyl ester in volume were used in steady-state experiments conducted in a high speed turbocharged direct injection engine. Engine internal processes were studied by means of exergy balances based on engine indicating data, which provided information about the impact of biodiesel blending on the amount of fuel exergy exchanged through heat, work and mass transfer. The data obtained from this exergy analysis served to identify the causes of the alterations in brake thermal efficiency measured in dynamometric bench tests. Operating in full load conditions and fuelled with the B20 blend, the engine showed an average increase of 4.16% in brake thermal efficiency and a gross increase of 4.24% in indicated thermal efficiency in relation to its performance with mineral diesel fuel.


Engenharia Agricola | 2013

Performance impact of the application of castor oil biodiesel in diesel engines.

Leonardo de Almeida Monteiro; Guilherme Pianovski Júnior; José Antonio Velásquez; Danilo S. Rocha; Andre Valente Bueno

The use of renewable fuels, such as the biodiesel, can ease the demand of fossil fuel for the power generation and transportation fields in rural area. In this work, the performance impact of the application of castor oil biodiesel is evaluated with an automotive and a stationary diesel engine. The application of B20 and B10 biodiesel blends and pre-heated net biodiesel is considered. The viability of the employment of B10 and B20 blends to mobility and power generation was observed from dynamometric bench tests, where this blends performed similar to fossil diesel. With the pre-heated net biodiesel, however, a brake torque loss and a specific consumption increase were observed with relation to diesel fuel.


Archive | 2012

Internal Combustion Engine Indicating Measurements

Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez

In engine combustion diagnosis, the apparent heat release rate and the combustion reaction extent are the most useful quantities obtainable from engine indicating data. The apparent heat release rate is calculated by computing the amount of fuel chemical energy release necessary to obtain the experimentally observed pressure, while the combustion reaction extent is evaluated through the released fraction of the total fuel chemical energy. Heat release analysis is often complemented using optical techniques and its utilization as a diagnostic tool covers a wide range of objectives, including the development of new combustion systems, the analysis of alternative fuel burning, the validation of mathematical models for engine simulation, the investigation of combustion chamber insulation effects and the study of new injection strategies.


SAE transactions | 1994

Analysis of the Irreversibilities in Diesel Engines

José Antonio Velásquez; Luiz Fernando Milanez


Applied Thermal Engineering | 2016

Volumetric efficiency optimization of a single-cylinder D.I. diesel engine using differential evolution algorithm

Stephan Hennings Och; Luís Mauro Moura; Viviana Cocco Mariani; Leandro dos Santos Coelho; José Antonio Velásquez; Eric Domingues


Mechanical Systems and Signal Processing | 2011

Notes on “A methodology for combustion detection in diesel engines through in-cylinder pressure derivative signal”

Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez


2004 SAE Brasil Congress and Exhibit | 2004

Exergy Based Diagnosis of In-Cylinder Diesel Engine

Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez


Fuel and Energy Abstracts | 2011

Heat release and engine performance effects of soybean oil ethyl ester blending into diesel fuel

Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez


Archive | 2003

ANALYSIS OF AQUA-AMMONIA POWER CYCLES FOR COGENERATION APPLICATIONS

José A. Borgert; Pontifical Catholic; José Antonio Velásquez

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Andre Valente Bueno

Federal University of Ceará

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José A. Borgert

Pontifícia Universidade Católica do Paraná

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Danilo S. Rocha

Federal University of Ceará

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Leandro dos Santos Coelho

Pontifícia Universidade Católica do Paraná

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Luís Mauro Moura

Pontifícia Universidade Católica do Paraná

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Pontifical Catholic

Pontifícia Universidade Católica do Paraná

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Stephan Hennings Och

Pontifícia Universidade Católica do Paraná

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