International Journal of Energy

ISSN: 1998-4316
Volume 10, 2016

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 10, 2016

Title of the Paper: Hydrogen Production by Steam Reforming of Methanol over Copper Catalysts Prepared by Using the Sol-Gel Method


Authors: Kaoru Takeishi, Hiromitsu Suzuki

Pages: 54-57

Abstract: Cu/SiO2, Cu/Al2O3, and Cu/ZrO2 catalysts were prepared by using sol-gel methods. Cu-Zn/Al2O3 catalyst was prepared by impregnation method. These catalysts and commercial CuO-ZnO catalyst were used for hydrogen production by methanol steam reforming. Catalysts prepared using the sol-gel method have bigger specific surface area, more highly dispersed copper metal particles on the catalyst surface, and higher durability for heat. These excellent physical properties work for faster hydrogen production rate and higher methanol conversion at wide range reaction temperature from 150 oC to 500oC. Especially, the Cu/SiO2 catalyst prepared using the sol-gel method is the most excellent catalyst for hydrogen production for fuel cells, because amount of by-product is smallest among the catalysts.

Title of the Paper: Some Considerations about the Hierarchy of the Technical Solutions for the Modernization of Power Plants


Authors: A. M. Duinea, M. Ciontu, C. Bratu

Pages: 48-53

Abstract: This paper aims at identifying and assessing the costs and revenues incurred by various solutions of development and modernization of a cogeneration power plant in order to optimize the way electric and thermal energy are produced and to conduct a sensitivity analysis of the main performance indicators in relation to the variations of the incoming economic data.

Title of the Paper: Energetic and Exergetic Analyses of a Solid Waste Power Plant Using Aspen Plus


Authors: Alperen Tozlu, Emrah Özahi, Ayşegül Abuşoğlu

Pages: 44-47

Abstract: Municipal solid waste management becomes an important role for the energy recovery from the waste when taking into consideration of energy requirement of the world. Meanwhile municipal solid waste disposal methods have been used as a renewable power source in recent years especially in developed countries. The most common technology landfilling is one of the simple and practical method among the disposal methods in worldwide. Internal combustion engines are used to generate electricity from LFG which is also preferred to generate electricity are most commonly lean fuel burn turbocharged designs. In this paper, starting from a historical overview of LFG driven power plants, the thermodynamic analysis is presented for a Jenbacher 416 GS type landfill gas engine which uses LFG gas produced by Gaziantep Municipal Solid Waste Power Plant. Operation of the municipal solid waste power plant is described in details.

Title of the Paper: PIV Measurements in Low Noise Optimized Air Jet Pump Demonstrators


Authors: Florin G. Florean, Andreea C. Petcu, Ionut Porumbel, Gabriel Dediu

Pages: 33-43

Abstract: The paper presents experimental PIV measurements of axial and fluctuating velocity in a set of four air jet pump demonstrators of different geometries, including a baseline solution and three geometries that had been optimized from an acoustic standpoint by numerical simulations. The changes in the flow field introduced by the geometrical modifications of the jet pump with respect to the baseline solution are analyzed.

Title of the Paper: Biomass Waste Thermal Processing in the Presence of Iron Subgroup Metals Compounds


Authors: Yury Yu. Kosivtsov, Esfir M. Sulman, Kirill V. Chalov, Yury V. Lugovoy, Antonina A. Stepacheva

Pages: 18-24

Abstract: In this work the results of the investigation of thermal destruction of biomass waste, using flax shive as an example in the presence of iron subgroup metals oxides, nitrates and chlorides are presented. Metal chlorides have the highest influence on the flax shive thermodestruction. In the paper the thermogravimetric study of biomass waste thermodestruction process is presented. The results of kinetic modeling are also shown on the base of thermogravimetric analysis both of the samples of flax shive and flax shive with addition of 10% (wt.) nickel chloride at different heating rate. The data on kinetic modeling show that in the presence of NiCl2 the apparent activation energy of one of the stages of thermal destruction decreased by 38±3 kJ/mol.

Title of the Paper: Holonic Approach in Control of the Future District Heating and Cooling Systems


Authors: Lubomir Vasek, Viliam Dolinay

Pages: 10-17

Abstract: This paper reflects on the modern concepts of production, supply and consumption of heat and cool in urban agglomeration in so called District heating and cooling (DHC) systems. Generally, a future concept for these systems expects also use of smaller decentralized sources, which utilize residual heat and renewable energy. To control such a system it seems the most appropriate to use some of the concepts of distributed control. In our case it will be holonic concept, in processes inside the DHC. The basic ideas of Holonic control are shown and steps necessary to incorporate it inside the DHC are described. These steps are based on analysis of the DHC processes and aimed at the formulation of the suitable holarchy for it. The individual holons and its function will be shown as well as services that provide their mutual cooperation. The example at the end of this article will show implementation for one of the system parts – CHP source.

Title of the Paper: Greenhouse Heating Systems Based on Geothermal Energy


Authors: F. Fahmy, D. Atia, H. El Madany, H. Farghally

Pages: 1-9

Abstract: Geothermal energy is one of the most important energy resources for electricity generation and is also used directly in heating, food and agriculture, aquaculture and some industrial processes. This paper presents a design of a greenhouse using a renewable energy resources for the thermal heating and electrical requirements for its operation. Photovoltaic , wind and geothermal energy are used for improve efficiency of crop production. In Egypt, the Suez Gulf is rich of geothermal springs. Ras Sedr is the site under consideration for chilli production, the required temperature is between 25-35 oC. There are several methods for greenhouse heating systems using geothermal energy which are finned pipe, standard unit heaters, low temperature unit heaters, fan coil units, soil heating, and bare tube. The economical analysis of thermal and electrical is done. The PV-wind hybrid system is proposed for greenhouse heating system which contains of (0.5 kW) photovoltaic arrays, (6 kW) wind turbines, one battery storage, inverter and charge regulator subsystems with levelized cost of energy of 0.114 $/kWh.