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RENEWABLE ENERGY USE IN HUNGARY AND IN THE SURROUNDING EU MEMBER STATES
Published August 21, 2020
23-29

In our paper, we survey the changes of the last 10 years regarding the use of renewable energy in Hungary and the surrounding EU countries (Austria, Bulgaria, Croatia, Czech Republic, Poland, Romania, Slovakia and Slovenia). In 2015, the share of renewable energy in EU28 is 16.7% of final energy consumption, 28.8% of electricity, 18.6% of heati...ng/cooling and 6.7% of transport. We present the renewable energy targets of Hungary and the surrounding member states and
their fulfillment in 2015. We also look at the share of the gross domestic energy and renewable energy consumption.

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Community development role of renewable energy projects
Published August 21, 2020
158-167

The spread of utilization of renewable energy resources is primarily motivated by objectives of energy policy and climate protection. However the rural and community development role of the new investments had got a greater significance in the past years. In the last years or decades the different renewable energy sectors became an important ob...jective of regional policy. In parallel with these changes the renewable energy sources aroused the interest of potential investors. The low population density and relative richness of natural resources in rural areas provide favourable conditions for location of these investments. On the base of local economic development aspects was designated as positive effects that the investments utilize the internal resources of these regions. However in practice it raises different significant questions. What is the role of local financial resources, professional skills and sufficient number of customers in renewable energy investments? We cannot imagine authentic and successful rural development projects without considering the interests and participation of local communities. Our research focuses on requirements of prosperous and long-term sustainable renewable energy based community development solutions following Hungarian and European examples.

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Modeling of the absorptive refrigeration systems run by geothermal energy
Published August 6, 2020
84-90

The aim of the article is to demonstrate an engineering solution which may promote the exploitation of the potential of renewable energy resources, and may provide cheap energy production for rural industries.

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Modern Procedures for the Improvement of the Energy Efficient and Environmentally Sensitive Operation of Aerial Vehicles
Published August 21, 2020
205-215

The undiminished development of air traffic has a direct effect on the environment of airports. Year in year out the continuously growing passenger traffic has increased the number air flights. The technological development has made it possible to increase the size and performance, - and with it the transportation of heavier payload - of aircra...ft. Of course, it has necessarily resulted in more fuel use (burnt fuel) emitting more pollutants into the atmosphere. In addition this effect appears not only during the high altitude flying polluting the high atmosphere, but due to the today very busy and the continuously increasing ground aircraft motion (taxiing) contaminating the close surroundings of the airport. With some innovation and technological development we can make the airports not only more environmentally friendly but also cost effective. In this paper I would like to introduce the possible use of renewable energy sources and the ground movement of aircraft without their own engines.

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Innovative Biodiesel Production
Published August 6, 2020
118-123

The importance of the research of the biofuels is moti vated according to the Hungary’s Renewable Energy Acti on Plan, on the other hand the Europe 2020 also emphasizes the smart and sustainable growth. The direct objecti ve of the research program is to investi gate the applicati on of microwave pre-treatment for bio-energeti c, the indirect... objecti ve is to ensure security of energy supply. Based on the experiences, the microwave energy is preferably used for intensifi cati on of certain chemical reacti ons. Pre-experimental experiences have shown that microwave irradiati on in the transesterifi cati on of vegetable oils (transesterifi cati on with methanol and NaOH catalyst) results in reducti on of ti me and energy demand of the process. Producti on of vegetable oil-based is made with microwave-assisted technology under diff erent method, operati onal and process parameters. As a result of the experiments established that the
transesterifi cati on reacti on ti mes of the microwaved transesterifi cati on are reduced signifi cantly compared to the conventi onal transesterifi cati on reacti on ti me, however, further investi gati on of compositi on of treated mixture and dielectric characteristi cs of the components are necessary to optimize the procedure for energy aspects.

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Energy Resources of Unmanned Aircrat Vehicle
Published August 6, 2020
92-100

Aviai on is the quickest and most praci cal way of locomoi on, to which people have been paying at eni on for thousands of years. Today – on account of air traffi c, energy crisis and environmentalism – the power source of the aircrat became a key issue. In addii on to fl ight safety, there is a growing emphasis on environmentally friendly ...operai on. The ineffi cient burning of fossil fuels comes hand in hand with the signifi cant pollutant emission and noise pollui on which bother even those living far from the airports. Nowadays the most important objeci ve of researchers and developers is to create an effi cient, clean and quiet airplane, thus as a new idea they at empt to ui lize electricity in this form on board the aircrat . The ari cle presents some various energy resources through some example of unmanned aerial vehicle.

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Is startup may be the solution for climate change?
Published August 6, 2020
94-101

Today, unemployment is caused by environmental and economic changes are burning quite a problem around the world. With startups over the past 10 years, the economy is showing more and more increasing trend, so why not make it against the climate change fight, even while the young entrepreneurs also support the economy. There are many things to ...do, which is still untapped, including the use of geothermal and renewable energy resources, which not only
reduced dependence on foreign countries, but also new jobs could be created using environmentally friendly methods. The innovative emerging entrepreneurs’ maybe will soon find a solution for climate change, because this phenomenon is certainly all the inhabitants of the earth directly or indirectly exercise influence.

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Trends in the Construction Industry and in Building Public Utilities
Published August 21, 2020
23-28

If one hears the word construction industry, one probably associates it with building a house, but the concept of construction industry covers a much larger area and can be divided into colourful periods. Architecture is the transformation of the built environment. On the one hand it is one of the branches of arts (applied arts), on the other h...and it is one of the branches of engineering and technology disciplines. Nowadays, more and more environment-friendly technology is used in the construction industry, and already in the design stage a considerable emphasis is put on the use of renewable energy resources, in particular the use of solar cells. To measure the trends in the construction industry and in the building of public works we have also prepared a questionnaire which was filled in by 100 managers of enterprises.

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