American Journal of Energy Research

Green building is a concept in which development should be implemented with environmental principles, start from design, construction, operation, and management. There is a Green Building Council Indonesia (GBCI) as a certification body for Green Building that established a Greenship New Building (NB) Version 1.2 as rating tools for green building assessment for new buildings in 2013. One of the categories that assessed is Energy Efficiency and Conservation (EEC). This study was conducted to determine how EEC criteria applied at Pascasarjana B Building Diponegoro University, by measuring the criteria based on Greenship NB Vers 1.2. The method of this study is comparing the existing condition of building with Greenship rating tools in order to know the points that would gained. The measurement of some criteria based on Indonesia National Standards and Ministry Regulation. From the results of the study, The Pascasarjana B Building Diponegoro University earns 10 points out of a total 26 points, or approximately 38.46% rating level for EEC. This baseline points obtained from some criteria such OTTV, Ventilation and Climate Change Impact. This study also gives recommendations output for compliance and building improvement to enhance the points based on Greenship rating tools.

American Journal of Energy Research. 2014, 2(2), 42-46. DOI: 10.12691/ajer-2-2-4
Pub. Date: April 29, 2014

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A Thermal Analysis and Optimization of a Combined Cycle by Several Technologies

by KILANI Nihed, KHIR Tahar and BEN BRAHIM Ammar

Original Research

Thermodynamic optimization of four power plant installations with different technology is presented and discussed in this paper. Numerical optimization of the different cycles is performed in aim to obtain higher efficiency. Thermal analysis performance for the fourth cycles is performed for a define range of operating parameters using a calculation code established according to EES software. The first studied cycle is a simple combined cycle containing gas turbine cycle with a steam injection system, one pressure heat recovery steam generator HRSG and a steam turbine cycle. The overall efficiency of this cycle in inlet ambient conditions is about 46%. The second cycle is a combined one with steam injection system for which the steam injected is generated outside the HRSG using heat recovery system at the air compressor outlet. The performance of this cycle in the same initial conditions is higher of about 1%. The third plant is a combined cycle with steam injection and two steam extractions from steam turbine and two open feedwater heaters. The performance of this cycle is higher of about 1% compared to the first one. The last considered power plant technology is a combined cycle with heat recovery at air compressor outlet and steam extraction. Obtained results show that the optimum operating parameters leading to the best performances are not the same for different cycles.

American Journal of Energy Research. 2014, 2(2), 35-41. DOI: 10.12691/ajer-2-2-3
Pub. Date: April 28, 2014

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Numerical Simulation of Natural Convection in a Vertical Conical Cylinder Partially Annular Space

by Belkacem OULD SAID, Noureddine RETIEL and El Hadi BOUGUERRA

Original Research

The present paper is dedicated to the numerical simulation of thermal convection in a two dimensional vertical conical cylinder partially annular space. The governing equations of mass, momentum and energy are solved using the CFD FLUENT code. The results of streamlines and the isotherms of the fluid are discussed for different annuli with various boundary conditions and Rayleigh numbers. Emphasis was put on the height of the inner vertical cylinder influence on the flow and the temperature distribution. More, the effects on the heat transfer are analyzed for different values of the fluid’s physical parameters in the annulus geometry. The heat transfer on the hot wall of the annulus is also computed in order to make comparisons the cylinder annulus for boundary conditions and several Rayleigh numbers. The obtained results in terms of Nusselt number has been found between the present previsions and available data from the published literature data.

American Journal of Energy Research. 2014, 2(2), 24-29. DOI: 10.12691/ajer-2-2-1
Pub. Date: April 18, 2014

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