José Antonio Velásquez
Pontifícia Universidade Católica do Paraná
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Featured researches published by José Antonio Velásquez.
International Journal of Exergy | 2004
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
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
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
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
José Antonio Velásquez; Luiz Fernando Milanez
Applied Thermal Engineering | 2016
Stephan Hennings Och; Luís Mauro Moura; Viviana Cocco Mariani; Leandro dos Santos Coelho; José Antonio Velásquez; Eric Domingues
Mechanical Systems and Signal Processing | 2011
Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez
2004 SAE Brasil Congress and Exhibit | 2004
Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez
Fuel and Energy Abstracts | 2011
Andre Valente Bueno; José Antonio Velásquez; Luiz Fernando Milanez
Archive | 2003
José A. Borgert; Pontifical Catholic; José Antonio Velásquez