Journal of Sustainable Energy

4

Authors: SETEL A, ANTAL C., BADEA G.

The paper presents the possibility of using geothermal energy in drying wood materials - a complex system with automatic control of the drying process.

5

Authors: RODEAN I., OLTEAN M.N., SEVASTRE I., BĂLAN V., MORAR N.D.

Using new technologies to equipment maintenance have a number of advantages well known. By applying these technologies work will achieve significant increases economic efficiency only if applied properly. In this sense it must be adequately trained staff, both maintenance operators and operational operators. CNTEE "Transelectrica" SA, through its policy, proposes the use of new technologies and LW technologies (live working). To develop and promote LW technologies and new technologies, the Company promoted the foundation of a centre for the training of personnel and development of new technologies. The centre will aim to promote new technologies and prepare personnel for the correct application of new technologies in our company and to increase readiness and effectiveness of actions taken by its own staff and authorize them for LW and other technology. Also the Centre can attest companies and their services and technologies. This paper presents some aspects of the Centre and how personnel receive the training services for more effective implementation of these technologies.

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Authors: KILYENI ST., BARBULESCU C., DEACU A., AGAPE C.P

The paper tackles the artificial neural networks (ANN) based load forecasting issue. It aims to define a set of "standard" load curves. They are representing the background to perform a prognostic regarding the forecast quality based on known data set. A case study is used as an example. Daily load curves forecasting is performed. A software tool has been developed in Matlab environment. The results are compared with the ones obtained for "standard" load curves.

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Authors: FELEA I., RANCOV N. , CHIREA V. , BOJA I., ȘINCA A., ALBUȚ D., FELEA A.I.

The paper is about de level of electricity quality in the power network and at power consumers from an urban area. The analysis was done at the request of local electricity company. After highlighting the importance of preoccupations, electricity nonquality effects and regulatory framework, in the paper is presented the working methodology and results synthesis. The last part of the paper contains the conclusions of the study.

3

Authors: JOIAN R., PETREUȘ D., PALAGHIŢĂ N., HORGOŞ M.

This paper point out some of the experimental determinations that must be made in the achieving of a hidro - wind hybrid system. It highlights the design and implementation of a1 kW ballast resistor and 48 V nickel-chromium wire, with the diameter of 60 three millimeters and connecting cable at the wind turbine by electric panel. Thus, this experimental stand CHHE includes a wind turbine 1 kW, placed on the roof of the Technical University of Cluj Napoca (this place is favorable because the wind has high speeds at great height) and hydro turbine type Pelton 1 kW power. The experimental stand for the study of CHHE hybrid energy system will allow the determination of more experimental conclusive on the impact of the achievement of an energy balance of the physical model.

6

Authors: VASIU I.

Thermal energy demand for district heating in the city of Oradea is supplied at present, almost at whole, by the Cogeneration Thermal Power Plant, based on classical fuels, mainly consisting of low grade coal and natural gas, with a small contribution of the geothermal energy. Geothermal resource at low enthalpy, located within the city area of Oradea, available at an estimated level of 250 GWh/year, exploited at present by 12 production wells, can provide a share of 55 GWh/year for district heating, representing at present about 7 % from the overall thermal demand at the end users inlet. Geothermal energy is delivered by means of 3 main thermal stations, in order to prepare, especially household warm water, but sometimes also secondary agent for space heating, using additionally heat, based on natural gas. At present, in the city area of Oradea, more than 7,000 dwellings are supplied by geothermal stations with warm water and in addition for about 3,400 dwellings is assured simultaneously warm water and space heating. Even if the geothermal energy provides at present only a small part of the overall heating requirement at the city level, nevertheless by increased financial support, in the near future is expected its much more contribution, as an alternative to polluting energy of coal and natural gas.

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Authors: CLODNIȚCHI R., TANȚĂU A.D.

Romania is one of Europe’s traditional producers of energy from renewable sources. After the regime change 1989 nothing happened in this market until 2008 when the Romanian renewable sector went through a remarkable boom. 5.000 MW new capacities were installed mainly in wind, PV and biomass plants but almost none in biogas plants. There is plenty of substrate available, some of it for free, and the support mechanism is also very generous when it comes to biogenic gas, so how come today there are less than 15 MW installed in biogas capacities? This question lies at the base of our research covering several company intern and extern aspects. This particular article addresses the risks induced by technology vs. the market risks on the basis of a study case from Romania. We analyse the profitability indicators of the first landfill gas recovery facility from Romania which was after implementation less profitable than expected.

3

Authors: FELEA. A. I.

This paper is structured into four parts. The first part refers to the importance of the main concerns regarding the insuring of energetic resources and the performance of the energetic systems. The second part describes the working methodology, defining and presenting the econometric model of some energointensity indictors. The third part of the article presents the results obtained and the last part of the paper presents the analysis conclusions.

4

Authors: DUINEA. A.M., MIRCEA P.M.

The paper presents the analysis of the actual operation scheme existing for steam generator drum. Following the trend valid for forced circulation steam generator, it is proposed to replace the classical adjustment loops with new regulation scheme highlighting its advantages in steam generation operation.

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Authors: MIRCEA P.M., BALTEANU M.S.

This paper presents, identify and analyzes the consequences of electrical work accidents and estimates their implications from the employers’ point of view and also from workers’ perspective, analyzing also a real case. It proposes a calculation method for evaluation of the cost and losses for companies and the victims that were involved in an accident and is exemplified for a real event

7

Authors: BARBULESCU C., KILYENI ST., FATI O.

The paper is focusing on evaluating the technical losses within a real distribution network. The study was conducted for a distribution system operator within the Romanian Power System. The analysed area is represented by a real part of the Romanian Power System. It is modelled in a computer aided power system analysis tool. Several power system operating conditions are analysed. Power system optimization measures are provided having as a goal to reduce the technical losses' value. Values obtained based on the field measurement are compared to the ones provided by computer simulations. These conclusions are very useful for the distribution network operator

4

Authors: FELEA. A. I

This paper targets the identification of certain correlations between some energetic security indicators and some energetic performance indicators. The first part of the article refers to the importance of the concernes regarding the competitiveness of the energetic processes. The second part of the article presents the working methodology, also in this section we tryed defining two correlation coefficients and to present the econometric model and assessment algorithm. The third section of this article presents the results and the last section of the paper presents the main conclusions of the analysis.

5

Authors: COROIU N., TUCUDEAN A.

The purpose of the work is to identify the personnel categories from energy industry, the approach in the selection, recruitment, hiring, as well as optimizing the working process, with examples from the process in a multinational company with private capital and integrated compartment in the human resources S.C. ELECTRICA S.A.

6

Authors: FELEA I., CSUZI I., SECUI D.C., BARLA E.

The specific problems of the urban public transport system in the literature of the field are widely reflected; the main targets are to increase the efficiency, the quality of service and to reduce their impact on the environment. The electric driven transport is an alternative that may operate according to these targets. This article inscribes in the actual concerns dedicated to optimize the tram parks with which the urban public transport companies (UPTC) operate, using an optimizing criterion, which leads to an efficient and quality transport service. In this article, after evoking the importance of this concern, the mathematical model of optimization is elaborated in two variants (general and simplified). The proposed analysing model is for an applied UPTC that operates a mixed system (trams + buses), in real level of reliability conditions of trams.

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Authors: SIMO A., KILYENI ST., BARBULESCU C.

The paper is focusing on dynamic programming use for power system expansion planning (EP) – transmission network (TNEP) and distribution network (DNEP). The EP problem has been approached from the retrospective and prospective point of view. To achieve this goal, the authors are developing two software-tools in Matlab environment. Two techniques have been tackled: particle swarm optimization (PSO) and genetic algorithms (GA). The case study refers to Test 25 buses test power system developed within the Power Systems Department.