Journal of Sustainable Energy

Number Vol.7/No.2, 2016

4
DURABILITY OF ANTICORROSIVE PROTECTION COATINGS FOR ELECTRO-ENERGETIC EQUIPMENT

Authors: CARAMITU A., VOINA A., RUS T., LINGVAY I.

Abstract

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Number of views: 449

Determining the working life of the anticorrosive protection layers is of great importance for electro-energetic installations. In order to assess the durability of the paint layers have been achieved films of 100 ÷ 120µm from six different commercial types of paint. After polymerization/drying, the dielectric characterization of the obtained films has been achieved by dielectric spectroscopy - both before and after their exposure to controlled doses of UV radiation. The experimental results have been revealed that the polymer matrix of the painting materials, over a critical dose of UV radiation (specific commercial sort), suffers a complex process of aging after which the anticorrosive insulation capacity decreases.

4
SPECIFIC ISSUES OF DISTRIBUTED GENERATION IN POWER SYSTEMS

Authors: BUNDA Ș.

Abstract

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Number of views: 352

Distributed Generation Systems (DGS) gets lately more and more importance in the context of concepts re-thinking within the electricity distribution networks. Understanding the key issues of DGS such as definition, technology and integration is important for the researchers and for the workers in the field as well. This paper aims to synthesize the DGS specific issues and finally conclusions are presented.

5
ECONOMIC AND FINANCIAL ANALYSIS OF THE BUILDINGS REHABILITATION SOLUTIONS

Authors: STAN IVAN F.E., MIRCEA I

Abstract

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Number of views: 390

The paper includes a simplified economical and financial analysis of the buildings rehabilitation solutions, for heating and lighting. The most important economic and financial indicators analyzed and determined are: economic return on investment and payback period of investment in dynamic form, net present value, and internal rate of return economic residual value of the investment on thermal insulation, building maintenance costs, energy costs. In order to reduce the electricity consumption: the methods consisted in replacing inefficient lighting with some efficient energy and for heat consumption: the proposed solution was building rehabilitation (exterior wall insulation, floor insulation board). The analysis consists in determining the economical and financial indicators before and after the building rehabilitation. The 3 rooms apartment is located in Craiova town, (wind zone IV), 2nd floor, orientation is S.

5
AN ASSESSMENT OF NIGERIA WIND ENERGY POTENTIAL BASED ON TECHNICAL AND FINANCIAL ANALYSES

Authors: DIOHA M.O. , DIOHA I. J., OLUGBOJI O. A.

Abstract

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Number of views: 317

The energy requirement of Nigeria is increasing exponentially with little projects available to carter for this increasing demand. The primary source of energy in the country which is fossil fuel creates environmental pollution and is also finite in nature. Hence, there is a serious need to look for other alternative ways to meet up with the energy requirement of the country. This paper analysed some of the economic and sustainability benefits for Nigeria by deploying and integratingwind energy into her energy mix. The study was done with the RETScreen Clean Energy software tool, designed by Natural Resources Canada. The study began with a brief review of the various wind energy resource assessment done previously in the country and Maiduguri town was selected as the area of study from the reviews. The technical and financial analyses of the study showed that if the project is implemented it will be beneficial to Maiduguri town and Nigeria in the long run. The process of electricity generation from 100 units of VESTAS V80 in Maiduguri yielded MWh 525,600 and saves about 202,881.6 tonnes of CO2. Without incentives, the financial analysis showed that the project is not financially viable with the equity payback greater than the project life. Key issues affecting the development of wind energy technology in Nigeria were also discussed.

5
INFLUENCES OF 50HZ ELECTRIC FIELDS ON GROWTH AND MULTIPLICATION OF SOME MICROORGANISMS

Authors: VOINA A., RADU E., CARAMITU A.R., LINGVAY M. , ALECU G.

Abstract

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Number of views: 367

By dielectric spectroscopy and specific microbiological techniques have been studied the development (cell multiplication) of Saccharomyces cerevisiae and Aspergillus niger growing and multiplication - both on culture media with sucrose and on those with starch. The experimental results have been revealed that the biochemical processes of the studied biomasses have significant changes in certain frequencies in the range 1 - 160Hz, characteristic of the different species/metabolized carbon source, respectively species/ metabolized carbon source/ development phase. It has also been found that in the case of Saccharomyces cerevisiae, the electric field of 50 Hz up to 20V/cm reduces the length of the LAG time and increases the growth rate of intensive increasing phase. Cultures of Aspergillus niger on culture medium with sucrose are stimulated (increasing the spores production by approx. 50% and reducing the maturity time) of 50Hz signals up to 15V/cm. Electric fields higher than 30 V/cm in all media and investigated cultures carry on to the growth reduction / multiplication - up to a complete inhibition of growth at approx. 50V/cm.

8
ANTHROPIC IMPACT ON AIR QUALITY IN THE DANUBE REGION

Authors: VOINA A., ALECU G.L.

Abstract

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Number of views: 293

There were monitored by data acquisition both in summer and winter period, the concentrations of pollutants - SO2, NO2 and particulate matter (PM10) – existing in air on the territory of 6 counties bordering the Danube. After processing and analysis of collected data have been found that: SO2 pollution may be due primarily burning fuel with high sulfur content and / or industrial activities for carbonic products (anodes for obtaining the electrolytic aluminum, graphite electrodes etc.); pollution with NO2 comes primarily from automobile exhaust gases; particulate matter pollution may be due both loess soil (high winds in dry periods) characteristic of the area investigated and dumps of ashes from coal power plant.