American Journal of Energy Research

Vegetable oils and their spinoff biofuels, unremarkably named as “biodiesel,” are prominent candidates as alternative diesel fuels. Twelve different blends of CNO, Ethanol and Butanol hybrid biofuel were tested for engine efficiency and it is discovered that they are technically competitive with or provide technical benefits compared to conventional diesel fuel. Besides being a renewable and domestic resource, biodiesel reduces most emissions while engine performance and fuel economy are nearly identical compared to conventional fuels. A comprehensive study of Fiji’s coconut industry is also undertaken.

American Journal of Energy Research. 2014, 2(4), 99-104. DOI: 10.12691/ajer-2-4-4
Pub. Date: December 30, 2014

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Impact of Shape of Obstacle Roof on the Turbulent Flow in a Wind Tunnel

by Slah Driss, Zied Driss and Imen Kallel Kammoun

Original Research

In this paper, we are interested in the impact of shape of obstacle roof on the turbulent flow in a wind tunnel. Particularly,arched, inclined, pitched and flat roofs obstacles are examined. A three-dimensional flow of a fluid is numerically analyzed using the Navier-Stokes equations in conjunction with the standard k-ε turbulence model. These equations were solved by a finite-volume discretization method. The comparison between our numerical and experimental results shows a good agreement and confirms the numerical method.

American Journal of Energy Research. 2014, 2(4), 90-98. DOI: 10.12691/ajer-2-4-3
Pub. Date: October 16, 2014

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Energy Consumption and Economic Growth Nexus: Empirical Evidence from Tunisia

by Kais Saidi and Sami Hammami

Original Research

This article examines the two-way linkages between energy consumption and economic growth using data from Tunisia over the period 1974-2011. This research tests this interrelationship between variables using the Johansen cointegration technique. Our empirical results show that there exists bidirectional causal relationship between energy consumption and economic growth in the long-run. The study suggests that energy policies should recognize the differences in the nexus between energy consumption and economic growth in order to maintain sustainable economic growth in Tunisia.

American Journal of Energy Research. 2014, 2(4), 81-89. DOI: 10.12691/ajer-2-4-2
Pub. Date: September 08, 2014

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An Application of Artificial Neural Network for Predicting Engine Torque in a Biodiesel Engine

by Bekir Cirak and Selman Demirtas

Original Research

In this application study, an artificial neural network (ANN) model to predict the torque of a diesel engine. Using ANN performance of a diesel engine using biodiesel produced from canola and soybean oils through transesterification. To acquire data for training and testing of the proposed ANN. A four cylinder and four stroke test engine was fuelled with biodiesel and eurodiesel mixtured fuels with various percentages of biodiesel % amounts to half the CB with SB and operated at different loads engine speeds, coolant temperatures, biofuel mixtures and exhaust temperature. Levenberg Marquards algorithms for the engine was developed using some of the experimental data for training. As a nonlinear system has been accepted. The performance of the ANN was validated by comparing the prediction dataset with the experimental results. It was observed that the ANN model can predict the engine performance quite well with correlation coefficient R 0.98 for the engine torque respectively. The prediction MSE (Mean Square Error) error was between the desired outputs as measured values and the simulated values were obtained as 0.0002 by the model.

American Journal of Energy Research. 2014, 2(4), 74-80. DOI: 10.12691/ajer-2-4-1
Pub. Date: August 19, 2014

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29113 Views10632 Downloads33 Likes4 Citations