Marcel Fedák
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View article: Structural Analysis of Joints Made of Titanium Alloy TI-6AL-4V and Stainless Steel AISI 321 with Developed Conical Contact Surfaces Obtained by Diffusion Welding
Structural Analysis of Joints Made of Titanium Alloy TI-6AL-4V and Stainless Steel AISI 321 with Developed Conical Contact Surfaces Obtained by Diffusion Welding Open
The object of this study is welded joints of AISI 321 and Ti-6Al-4V, obtained by diffusion welding on developed conical surfaces. The problem of creating bimetallic joints of AISI 321 and Ti-6Al-4V with developed conical contact surfaces, …
View article: Study of the Impact of Epoxidized Soybean Oil on the Characteristics of Wood-Polymer Composites
Study of the Impact of Epoxidized Soybean Oil on the Characteristics of Wood-Polymer Composites Open
The effect of epoxidized soybean oil on the operational, technological, and physical and mechanical properties of composites based on high-density recycled polyethylene filled with wood floor was investigated. It has been shown that the in…
View article: Neural Network Modeling of Physicochemical Processes in Fluvisols with the Application of Sewage Sludge as Fertilizer for Energy Crops
Neural Network Modeling of Physicochemical Processes in Fluvisols with the Application of Sewage Sludge as Fertilizer for Energy Crops Open
This study investigates the impact of sewage sludge-based composts on the quality of sod-podzolic soils (Fluvisols, WRB), which are naturally acidic and low in fertility. A field experiment with eight variants was conducted, applying diffe…
View article: CFDSimulationoftheParaffin-BasedPhase Change Material in the Energy Storage Process
CFDSimulationoftheParaffin-BasedPhase Change Material in the Energy Storage Process Open
This work focuses on numerical modelling in the ANSYS software environment, with an emphasis on analysing the thermal properties of components. The individual steps are described – from creating the geometric model, setting boundary condit…
View article: LIFE-CYCLE AND ENERGY CONSUMPTION OF THE COMMERCIALLY AVAILABLE PASSENGER CARS
LIFE-CYCLE AND ENERGY CONSUMPTION OF THE COMMERCIALLY AVAILABLE PASSENGER CARS Open
Today, passenger vehicle emissions alone represent 15% of global greenhouse gas emissions (GHG). The automobile industry is aware of this and has taken steps towards decarbonization over the past decade. Emissions related to the six phases…
View article: Energy Evaluation and Mathematical Modeling of Pellet Production from Metal-Bearing Waste with a Focus on Alternative Applications of Reducing Agents
Energy Evaluation and Mathematical Modeling of Pellet Production from Metal-Bearing Waste with a Focus on Alternative Applications of Reducing Agents Open
The authors of this study focused on the energy and material assessment of processes for processing pellets from metal-bearing waste, specifically Fe concentrate. A mathematical model was created for process evaluation, with which thermote…
View article: Techniques for Enhancing Thermal Conductivity and Heat Transfer in Phase Change Materials in Hybrid Phase Change Material–Water Storage Tanks
Techniques for Enhancing Thermal Conductivity and Heat Transfer in Phase Change Materials in Hybrid Phase Change Material–Water Storage Tanks Open
In recent years, extensive research has been dedicated to enhancing energy efficiency and promoting environmental sustainability in heating and cooling systems. Among the promising solutions, phase change materials (PCM) technology stands …
View article: DEVELOPMENT OF A MATHEMATICAL MODEL FOR THE ENERGY BALANCE OF THE LASER CLADDING PROCESS OF METALLIC POWDERS WITH A COAXIAL NOZZLE
DEVELOPMENT OF A MATHEMATICAL MODEL FOR THE ENERGY BALANCE OF THE LASER CLADDING PROCESS OF METALLIC POWDERS WITH A COAXIAL NOZZLE Open
Modern technologies require innovative solutions for producing complex structures from various materials. Additive manufacturing (AM) or 3D printing presents such a challenge and has significantly impacted the environment across manufactur…
View article: A STRATEGY FOR REDUCING CARBON EMISSIONS IN A CITY USING A LOW-CARBON STRATEGY - A CASE STUDY
A STRATEGY FOR REDUCING CARBON EMISSIONS IN A CITY USING A LOW-CARBON STRATEGY - A CASE STUDY Open
Various environmental policies are created on the basis of scientific knowledge in the sectors of energy, climate and transport. An important role has the Paris Agreement with the aim of limiting the increase in global temperature. The com…
View article: EXPERIMENTAL VALIDATION OF THE EFFECT OF PISTON SPEED ON THE HOMOGENEITY OF DIE CASTINGS
EXPERIMENTAL VALIDATION OF THE EFFECT OF PISTON SPEED ON THE HOMOGENEITY OF DIE CASTINGS Open
One of the most progressive technologies in foundry is die casting, where a significant part is formed by die casting of castings of a lower weight category. In the case of castings cast by pressure casting technology, one of the important…
View article: SOLID-PHASE POLYCONDENSATION OF POLYETHYLENE TEREPHTHALATE WITH TECHNOLOGIES OF ITS REACTIVE EXTRUSION
SOLID-PHASE POLYCONDENSATION OF POLYETHYLENE TEREPHTHALATE WITH TECHNOLOGIES OF ITS REACTIVE EXTRUSION Open
It has been experimentally confirmed that polyethylene terephthalate during its processing into products destruct without carrying out the process of solid-phase polycondensation. The conditions for both primary and secondary polyethylene …
View article: Modeling of Heat Flux in a Heating Furnace
Modeling of Heat Flux in a Heating Furnace Open
Modern heating furnaces use combined modes of heating the charge. At high heating temperatures, more radiation heating is used; at lower temperatures, more convection heating is used. In large heating furnaces, such as pusher furnaces, it …
View article: Experimental Device for the Measurement of Small Gas Flows Utiliying the Principle of Lamilar Flow Elements
Experimental Device for the Measurement of Small Gas Flows Utiliying the Principle of Lamilar Flow Elements Open
In this paper, the authors proposed an experimental device for measuring small flow rates of gaseous media. The device is based on the measurement of the pressure gradient upstream and downstream of the measuring element. The materials use…
View article: Renewable Energy Heat Source Desing and Modelling
Renewable Energy Heat Source Desing and Modelling Open
Rising fossil fuel prices and growing environmental awareness are leading to a search for alternative energy sources for heating. This paper deals with the design of a heat source based on the use of renewable energy sources. The aim is to…
View article: CFD Modelling of the Interior Conditions of a Multipurpose Space
CFD Modelling of the Interior Conditions of a Multipurpose Space Open
The article explores how CFD simulation tools can be applied to the design of central heating and air-conditioning systems in buildings. The models created with these tools can evaluate the thermal comfort conditions in the rooms, as well …
View article: SELECTION CRITERIA OF WORKING PAIRS ADSORBENT - ADSORBATE FOR THERMAL ENERGY TRANSFORMERS
SELECTION CRITERIA OF WORKING PAIRS ADSORBENT - ADSORBATE FOR THERMAL ENERGY TRANSFORMERS Open
In the manuscript the main factors that affect the thermal mass of open and closed types of heat storage devices are shown. Also, the main requirements for adsorption modules are given. The calculation procedure has been refined, which inc…
View article: RHEOLOGICAL PROPERTIES OF POLYMER-POLYMER MIXTURES ON CORN STARCH BASE
RHEOLOGICAL PROPERTIES OF POLYMER-POLYMER MIXTURES ON CORN STARCH BASE Open
The prospects for the use of polymer-polymer mixtures based on corn starch as alternative thermoplastic materials to polyolefins are considered. Rheological curves have been obtained, which confirm the possibility of processing such mixtur…
View article: THE INFLUENCE OF HYDROGEN CONCENTRATION IN NATURAL GAS ON HEAT FLOWS IN A THERMAL AGGREGATE
THE INFLUENCE OF HYDROGEN CONCENTRATION IN NATURAL GAS ON HEAT FLOWS IN A THERMAL AGGREGATE Open
Natural gas is currently a hotly debated topic both from an environmental point of view due to the production of CO2 and from an economic point of view. The article is focused on the analysis of selected energy factors when burning natural…
View article: STUDY OF SELECTED BURNER PARAMETERS ON THE GAS-AIR MIXTURE COMBUSTION
STUDY OF SELECTED BURNER PARAMETERS ON THE GAS-AIR MIXTURE COMBUSTION Open
The study of the combustion of a gas-air mixture using burners opens possibilities for further research, in which it is possible to modify the parameters of existing burners (geometry, method combustion air distribution, ...). Flame length…
View article: Method of Sequential Approximation in Modelling the Processes of Heat Transfer and Gas Dynamics in Combustion Equipment
Method of Sequential Approximation in Modelling the Processes of Heat Transfer and Gas Dynamics in Combustion Equipment Open
The behavior of the processes taking place in furnaces determines the efficiency of fuel chemical energy utilization, the quality of the final products and the environmental safety of the production. Mathematical models of the processes of…
View article: INFLUENCE OF HEAT ACCUMULATION OF THE OBJECT ON THE OPERATION OF THE COOLED CEILINGS COOLING SYSTEM
INFLUENCE OF HEAT ACCUMULATION OF THE OBJECT ON THE OPERATION OF THE COOLED CEILINGS COOLING SYSTEM Open
The application of cooling systems is a relatively efficient way to ensure the required thermal comfort conditions. One option is the application of cooled ceilings, where the heat load is removed using a ceiling structure with integrated …
View article: ANALYSIS OF THE HEAVY METALS CONCENTRATION IN THE SOLID ALTERNATIVE FUEL ON BIOMASS BASIS
ANALYSIS OF THE HEAVY METALS CONCENTRATION IN THE SOLID ALTERNATIVE FUEL ON BIOMASS BASIS Open
Sustainable development requires the research on new energy sources that will be safe and at the same time help to solve other societal problems. The paper is focusing on the analysing the heavy metals concentration of biomass and fuel mix…
View article: Analysis and CFD Modeling of Thermal Collectors with a Tracker System
Analysis and CFD Modeling of Thermal Collectors with a Tracker System Open
Thermal solar systems are currently one of the most suitable ways to convert solar radiation into usable energy. To ensure maximum energy gain, it is necessary to correctly adjust the direction of the collectors in the southern direction. …
View article: EVALUATION OF THE RADIANT COOLING CEILING PANELS WITH A REVERSIBLE HEAT PUMP
EVALUATION OF THE RADIANT COOLING CEILING PANELS WITH A REVERSIBLE HEAT PUMP Open
Thermal comfort is one of the basic prerequisites for appropriate operating of the building. Ensuring thermal comfort in the summer means creating suitable thermal conditions in the interior. The present article evaluates the operation of …
View article: EVALUATION OF COMBINED PRODUCTION OF HEAT AND ELECTRICITY ON THE COGENERATION UNIT
EVALUATION OF COMBINED PRODUCTION OF HEAT AND ELECTRICITY ON THE COGENERATION UNIT Open
The purpose of currently contribution is to analyse and compare effectivity of cogeneration unit in each summer and winter season. The main idea of combined heat and energy production is to reduce usage of primary fuels and with that conne…
View article: ANALYSIS OF THE INTEGRATION POSSIBILITY OF THE ELECTRIC VEHICLES ON BATTERY AND FUEL-CELLS BASE IN TRANSPORT SECTOR OF THE SLOVAK REPUBLIC
ANALYSIS OF THE INTEGRATION POSSIBILITY OF THE ELECTRIC VEHICLES ON BATTERY AND FUEL-CELLS BASE IN TRANSPORT SECTOR OF THE SLOVAK REPUBLIC Open
The total world energy consumption is permanently growing during last 30 years. Alternative energy sources are one of the best ways to save the environment polluted by the combustion products of gasoline, diesel fuel, and even methane or p…
View article: Energy Treatment of Solid Municipal Waste in Combination with Biomass by Decentralized Method with the Respect to the Negative Effects on the Environment
Energy Treatment of Solid Municipal Waste in Combination with Biomass by Decentralized Method with the Respect to the Negative Effects on the Environment Open
Waste is a product of society and one of the biggest challenges for future generations is to understand how to sustainably dispose of large amounts of waste. The main objective of this study was to determine the possibility and conditions …
View article: Experimental Investigation of Primary De-NOx Methods Application Effects on NOx and CO Emissions from a Small-Scale Furnace
Experimental Investigation of Primary De-NOx Methods Application Effects on NOx and CO Emissions from a Small-Scale Furnace Open
Nitrogen oxides (NOx) from combustion contribute significantly to atmospheric pollution. An experimental setup was employed to investigate the application of three primary denitrification methods, i.e., reburning (staged combustion), overf…
View article: Performance Evaluation of Elimination of Stagnation of Solar Thermal Systems
Performance Evaluation of Elimination of Stagnation of Solar Thermal Systems Open
The study deals with the possibility of elimination of stagnation of thermal systems. The state of stagnation of thermal systems leads to overheating and evaporation of the heat transfer medium, which increases pressure and can lead to dam…
View article: Mathematical Model of a Heating Furnace Implemented with Volumetric Fuel Combustion
Mathematical Model of a Heating Furnace Implemented with Volumetric Fuel Combustion Open
Heating flame furnaces are the main type of furnaces used for heating and heat treatment of metal products in metallurgy and mechanical engineering. In the working chamber of a modern heating furnace, there should be neither high-temperatu…