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This paper highlights several aspects regarding energetic and functional advantages of hydraulic transmissions based on adjustable volumetric machines, located in their primary and secondary sectors. To this end, numerical simulations were performed upon hypothetic hydraulic transmissions of primary or secondary adjustment, as well as numerical simulations and experimental research on MOOG radial piston pump type RKP-D. This servo pump, which can operate either in closed loop of flow or in closed loop of pressure,...

Energy demand and consumption is one of the key factors of a country’s level of development. They are not only related with economic development but also the dimension of security and environment should be taken into account. Hence, sustainability and resource diversity have overriding importance for the countries. Turkey has a considerably high level of renewable energy resources that can be a part of the total energy network in the country The optimum use of Turkey’s non-renewable and renewable resources sho...

In this study, simulation modelling of insulation layer (di), for residential buildings in 81 cities classified into four climatic regions in Turkey was. This stimulus model is constructed into Rule-Based Mamdani-Type Fuzzy Modelling (RBMTF) using input parameters (Uw, Te,Met, Te,TSE, Rwt, qTSE) and output parameter di described by RBMTF if-then rules. RBMTF has been designed using the MATLAB fuzzy logic toolbox.

The paper presents a hydraulic system used for the recovery kinetic energy from the road motor vehicle in the braking phases and using it, in the acceleration phases, in order to energy saving of the motor vehicles. All the system is conceived like a mechatronics system, for the medium and heavy motor vehicles. The hydraulic system allows the extrapolation to different sizes of vehicles and can be mounted on new motor vehicles, as well as old cars, in the framework of rehabilitation actions. The energy recovery hy...

After the entry to the European Union the energetic policy of the Slovak republic became an integral part of the European Union energetic policy as well as the element of the world market with the energetic resources. Slovak republic imports around 90 percent of its primary energetic resources that are at the same time poorly diversified because most of them are originated in the Russian Federation. In spite of the significant structural changes in the last two decades the Slovak economy still remains heavily depe...

This paper considers potential changes in storm occurrence and intensity over the western Black Sea through analysis of long term series of wind and wave conditions simulated with relatively high resolution. It is a result of coupling of atmospheric and wave models and spans period of more than 60 years (1948-2008). On the basis of the established methodology of wave climate clustering, wave events capable of producing a noticeable morphological response are separated from the remaining part of the dataset. Furthe...

Knowing wind energy and its features can help programmers in using this clean, free and renewable energy. Iran is located in the west wind region, and the common wind direction is from north-west to south-west in Iran. But in some regions of Iran, due to special regional conditions as well as the synoptic factors of atmosphere, the wind direction is different from the common wind direction in Iran. The wind speed is also higher than the average speed of west winds. Based on the statistics from wind speed and direc...

Fuel cells are the high efficient devices those convert the chemical energy to the electrical energy. Basically a fuel cell is comprised anode, cathode and electrolyte of parts. Membranes have been used as electrolyte which are made up of various materials. The specifications of membranes are important for the productive working of the fuel cells. In this study the literature research regarding membranes which are used us electrolyte in fuel cells has been realized and their technical specifications have been stud...

In recent years, the concern for renewable energy sources has intensely increased the studies on fuel cells. Solid Oxide Fuel Cells (SOFC) among other fuel cell technologies is seen as an ideal preference in order to be used as cogeneration system with its high operation temperature. The operation of SOFC fuel cell systems depends on thermodynamic, electrochemical and mass transfer theories. In this study, the mathematical models of electrochemical events occurred in solid oxide fuel cells were investigated theore...

Many countries has used the wind energy for agricultural pumping water for many years. Mechanical energy or electrical energy which is converted from the wind energy drives the pump. Water is not directly convey the target areas due to discontinuous wind regime. Therefore water is conveyed the storage tank. In addition, using the drip irrigation system at this system is provided saving at the agricultural economy. The increasing use of wind energy instead of the fossil energy provides to decrease pollutant emissio...

In recent years, all over the world and in Turkey, as aresult of, increasing population, industrial and urban developpment and reasing life standarts, the fosil fuels have dramatically been used up and caused environmental pollution. Since it has been recognized that energy sources such as petroleum and coal are non renewable energy sources and they are limited, researches have been concentrated on the biomass energy, wind energy, solar energy and hydro-energy which are renewable and obtained easily in all world. ...

Renewable energy sources (RES) at the Slovak Republic have only 1,6 \% part in general of power consumption. The development of RES utilization in definitely within the priorities and will positively become evident in political economy of Slovak Republic in several spheres: 1. Level increasing of a home energy sources value 2. Decreasing depends on external energy supplies, which currently cover approx.90\% of the total consumption of the primary energy sources. 3. Improvement of foreign market balance (because th...

The paper analyzes geopolitical circumstances on the global oil market towards the beginning of the 21st century. After the oil price leap, the global oil market has entered the phase of possible energy-related crises, political instability and major disturbances. Such a condition makes the energy-related situation of energy importers rather difficult, especially when it comes to relatively small countries outside of geopolitical integrations, but also makes the need for energy savings topical once again, along wi...

The purpose of this article is to present methods and software tools to ensure an optimal decision process for controlling the greenhouse climate. The efficiency of plant production in greenhouses depends significantly on the adjustment of optimal climate growth conditions to achieve high yield at low expense, good quality and low environmental load. To achieve these goals several components (temperature, air humidity and CO2 concentration) must be controlled optimally given certain criteria through heating, venti...

In recent years, all over the world and in Turkey, as a result of increasing population, industrial and urban development and rising life standarts, the fosil fuels have dramatically been used up and caused environmental pollution. Since it has been recognized that energy sources such as petroleum and coal are non-renewable energy sources and they are limited, researches have been concentrated on the biomass energy which is renewable and optained easily in all world. In this study, from the available statistical d...

The crushing energy in mineral processing industry is usually determined by experimental Bond’s index regardless mechanical parameters of rocks. Bond’s index is a comminution parameter which was defined by Bond. In this study, with the purpose of correlating the strain energy of rock to the corresponding energy estimated by Bond’s index, cubic Granite specimens are simulated between two rigid jaws and are broken due to movement one of the jaws against the other. The specimens are modeled as elasto-plastic me...