• Energy Research
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The usage of high voltage discharge in liquid has many technological applications. For realization of high voltage pulse discharge in liquid are used circuits with two discharge gaps, and one of them functions as a controllable high voltage switch. At capacitive energy storage and considering the parasitic inductances the discharge pulse most often has periodically attenuating character. The current work is dedicated to experimental study of high voltage discharge in a circuit with two discharge gaps with the usage of a controllable air discharger - trigatron. On the basis of the received results is performed analysis and is created a model of the resistance change at discharge in time, regarding the capacitance of the capacitor battery and the voltage, which it is charged to.

The report describes the backstory, concepts, technologies used and the results achieved in the implementation of the pilot project "Intelligent Street Lighting of Varna 2015" - an important part of the realization of the European policy for sustainable urban development and the creation of Smart City.

The report presents the effect of the implementation of intelligent street lighting in Varna. Design methods and management scenarios are considered. The characteristics of the light environment are analyzed. The effect of optimal light scenarios on energy savings has been investigated. The results show the high energy efficiency of the design solution achieved with the implementation of the CityTouch management system.

The paper presents development of scaled laboratory physical models for simulation of different regime conditions, representing the processes in real electric power supply systems for electric transport. For performing of these experiments is necessary to design and construct physical models of electric power supply systems and electrical equipment, which correspond to modern regenerative electric drives in electric transport. In results the study presents project of scaled laboratory model for simulation of the processes between two electric transport vehicles, connected to common electric feeder.

This paper’s purpose is to analyze the operation, components and specifications of SCADA based system for control and data collection of renewable energy system installations. The primary functions of those systems, technical, software and electronic solutions are examined and presented. The management, monitoring and control capabilities for renewable energy installations are illustrated in detail Целта на разработката е анализ на работата, компонентите и спецификациите на SCADA базираните системи за контрол и събиране на данни за ВЕИ инсталации. Разгледани са основни функции и изискванията за технически, софтуерни и електронни решения. Изложени са възможностите на системата за осигуряване на управление, мониторинг и контрол във ВЕИ инсталации

In this article the results of studies related to improving the energy efficiency of a building are shown. The study of the production of hot water for household needs using renewable energy source is done. Data showing correlation of the monthly heating load for a home with a certain number of inhabitants are discussed. The replacement ratio is part of the thermal capacity of the building, obtained from a renewable energy source is calculated. Burgas Free University

The study presents the participation of electric transport in the overall energy mix for the base period and the planning period 2014-2020. The presented data include a comparative analysis between the different branch of transport for the city - automobile and electric, as well as a comparison with other sectors - domestic, industrial, municipal buildings and services. The results of the survey allow analysis of the change of the planned indicators and they can be served as a basis for drawing up adequate strategies for the next monitoring period.

The paper examines the possibilities of interaction between ecological and cultural tourism in order to diversify the tourism product and to achieve sustainable tourism outcomes. New trends in tourism demand are marked by sustainable development: conservation of natural and anthropogenic resources, raising the awareness of visitors on the topics of sustainability and adding value to local host communities. Ecotourism is sustainable tourism that protects the natural and cultural values and follows the principles of sustainable development by supporting conservation of the natural resources, biological and landscape diversity, promoting regional development and geoecological protection. Ecotourism preserves the identity of local communities and enhances their social status. A definition of eco-cultural tourism is proposed and its role as a tool for sustainable development is discussed. The analysis of the factors for eco-cultural tourism development in the village of Dragoinovo, Parvomay Municipality and their levels of influence will contribute to the evaluation and utilization of the tourism potential of the area. The model of the factors for the development of eco-cultural tourism is based on six groups of factors: economic conditions; population distribution; state of the environment; cultural factors; infrastructure and physiological factors, as well as on three levels of influence: region, municipality and settlement. The development of an eco-cultural tourism product would have an economic and social importance for the territory, but at the moment that potential is completely untapped.

The paper presents a study on power quality indexes and characteristics of electricity consumption in cement production industry. The main object of the research is the electric power delivery system on medium voltage 6 kV in “Titan Zlatna Panega” Industrial Plant. The research proposes technical solutions for improving energy efficiency of electrical distribution system. Study gives assessment of effectiveness by application and installation of reactive power compensation and harmonic filtering system in electrical distribution system Titan Zlatna Panega Factory.

The presented study is dedicated to the interdependencies between the European Energy Union (the EEU) and the European Union Framework Programme for Research and Innovation “Horizon 2020”, which is one of the key tools for achieving the EEU objectives. The main EU legislative acts, which together form the Energy Union Package, are pointed out and briefly analysed. Significant attention is given to the five fundamental dimensions of the European Energy Union, and in their context are visualised the different instruments necessary for and serving the achievement of the Union’s objectives. The foundations and the legal framework of the Horizon 2020 Programme are established. By using the methods of analysis and synthesis the relation between the objectives of the EEU and the Horizon 2020 Programme is visualised, with particular attention to the 2016-2017 Horizon 2020 Work Programme. Finally, several main conclusions that come as a result from the research are formulated. JEL: F21, K32, K33, O13, Q4