Journal of Sustainable Energy

Number Vol8/No 1, 2017

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FACTORS OF REFUSALS IN ELECTRICAL DISTRIBUTION NETWORKS 10 KV

Authors: POPESCU V.

Abstract

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Number of views: 280

At present, in electrical distribution networks with tension 10 kV take place a significant number of refusals, which affect the reliability of electricity supply to all consumers. The behavior of these interruptions permit the development of the mechanism for ensuring continuity of electricity supply to consumers. Ensurance of continuity of quality power supply of consumer can be achieved only on the bases of profound knowledge of the phenomena that accompany this process, which permits a justified planning from technical and economic point of view, measures and activities of exploitation services of electrical distribution networks with tension 10 kV, in view to ensure the normal indicators of reliability. The paper is devoted to assessing the distributions of refusals in electrical networks with tension 10 kV, for developing the forecasting mechanism and to ensure the reliability of power supply.

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SOLAR CELLS PERFORMANCE REDUCTION UNDER THE EFFECT OF DUST IN JAZAN REGION

Authors: KARMOUCH R., EL HOR H.

Abstract

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Number of views: 305

The accumulation of dust on the solar cells panels worsens the situation and lowers the efficiency of the solar cells day by day especially in the regions known by their high rate of dust, low frequency and intensity of rain. The accumulated dust on the solar cells panel blocks the cells from the sun’s rays and act as a screening effect as shown by the calculated spectral transmittance of dust which decreases the performance of the solar cells over time until the cell panels are cleaned manually or by rain. The tilt angle of the solar cell panels affects considerably the amount of accumulated dust on the surface of the panels. The study focuses on the effects of dust accumulation on photovoltaic solar panels in Jazan region. The effect is tested in outdoor measurements and it was found that regular dust accumulation reduces the solar cells efficiency by about 10% for an exposure time of 16 weeks. Moreover the tilted panel with an angle of 30o receives more dust than the panel tilted by 50o which means higher efficiency loss for the lower tilted panel. The efficiency loss is significant of large of annual monetary losses. This study can be considered as a reference to predict the level of degradation of any photovoltaic system that might be installed in the Jazan region and also to estimate the real cost include the cost of the solar panel cleaning.

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DESIGN ASPECTS OF A RESIDENTIAL WIND GENERATOR

Authors: BRAD C., BOTEZAN A., VADAN I.

Abstract

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Number of views: 306

In this paper we present some aspects about the design of a small permanent magnet wind generator with axial magnetic flux often used in residential wind turbine. There are summarised the main steps of the magnetic and electric calculations with applications to a particular case: 0.6 kVA wind generator. The axial flux wind generator design starts with the characteristics of the rare earths permanent magnet existing on the market.

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MEASURES TO IMPROVE ENERGY EFFCIENCY PLATFORM OF A TOURISM COMPANY

Authors: FELEA. I., KUBOLA T., MIHUTA S.

Abstract

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Number of views: 309

Energy efficiency improvement program for an organization that consumes a significant amount of energy is an important document, both through fulfillment of obligations and especially through utility of identified measures on improving EnEF. and economic. After evoking the regulatory framework and the usefulness of this concerns, the paper presents the working methodology in making identifications MIEnEF for a TC and the results for Turism Felix.

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ACTUAL PROBLEMS FOR ROMANIAN RESEARCH IN THE ENERGY FIELD

Authors: ADAM A.A., RUGINA V., BADEA A.

Abstract

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Number of views: 285

The paper presents the actual situation and the problems the Romanian research in the energy field is confronted with in a period when budget financing has been drastically reduced as to the commitments and the forecasts and the great companies in the energy field have to face major economic difficulties. The paper analyzes the main components of the research-development system of national interest: the national research and development institutes, the higher education institutions, the traditional companies that have RDI activities, the recently established companies with activities in the RDI field. The paper presents some of the results of the Romanian organizations participating in the research programmes financed from national and European funds. The higher education institutions are in the most favorable situation relating to the development of the equipment and apparatus as a result of their participation in the research projects. The dependence of the national institutes on the Nucleus Programmes has increased lately. Many traditional companies that have RDI activities are in a dramatic situation.

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ELECTRICAL BEHAVIOR ANALYSIS OF AN INDUSTRIAL CONSUMER

Authors: ALBUT-DANA D., RANCOV N., FELEA A.I., CHIREA V., VESE C.

Abstract

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Number of views: 307

In the paper is presented anelectrical behavioranalysis of an industrial consumer. The analysis has the purpose to identify the solutions to increase of energy efficiency, also pointing out the extend of the recommendations that has been applied in this regard, in the elaborated electricity audits. In the first part of the paper is made a justification of preoccupation and is presented the objective of analysis. The second part has the working methodology. Then follows the results obtained and on the last part the conclusions of analysis is given.