Title:

Methods for Determining Thermal-mechanical Wear of Refractory Materials

Authors:

Róbert Dzurňák, Gustáv Jablonsky, Augustín Varga, Šimon Staško, Gabriel Sučik, Beatrice Plesingerová, Radka Bakajsová

Abstract:

The presented article deals with methods of testing refractory materials that are currently most often used for testing low-temperature corrosion caused by biomass ash. The article deals with the effect of the chemical composition of biomass on melting temperatures and what standards are used to evaluate these processes. The article also discusses the methods of testing the abrasion of the surfaces of refractory materials. The article points out that at the same time the testing methods are not sufficient for evaluation and that the testing conditions do not reflect the operating parameters achieved in real devices.

Citation:

Dzurňák Róbert, Jablonský Gustáv, Varga Augustín, Staško Šimon, Sučik Gabriel, Plesingerová Beatrice, Bakajsová Radka: Methods for Determining Thermal-mechanical Wear of Refractory Materials, Advance in Thermal Processes and Energy Transformation, Volume 5, No. 3, (2022), p. 36-369, ISSN 2585-9102. https://doi.org/10.54570/atpet

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Title:

Heat Loss Reduction in the Selected Hot Water Distribution System

Authors:

Peter Lukáč

Abstract:

One possibility of reducing the energy consumption of buildings is to reduce heat loss in hot water distribution system kept in buildings. The aim of this paper is to present the results of research, which focused on energy efficiency of the distribution system of hot water in residential buildings. As part of the research have been carried out test measurements on the hot water distribution line and air temperature around the distribution line. Test measurements were conducted in two separate stages, in which measurements were made, as with continuous and intermittent operation in distribution system. The first stage of measurements took place before reconstruction of hot water distribution system when pipes weren´t insulated with thermal insulation. The second stage took place after reconstruction of the system, when pipes were fitted with thermal insulation. The aim of the research was to determine the course of the temperature of the water in the distribution system in different stages and highlight the effectiveness of isolating the hot water distribution system.

Citation:

Lukáč Peter: Heat Loss Reduction in the Selected Hot Water Distribution System, Advance in Thermal Processes and Energy Transformation, Volume 5, No. 3, (2022), p. 40-44, ISSN 2585-9102. https://doi.org/10.54570/atpet

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Title:

Experimental Devices for Measuring Small Gas Flows

Authors:

Nikolas Polivka, Ján Kizek, Miroslav Rimár, Augustín Varga, Juraj Roth

Abstract:

In this paper, the authors present the design of an experimental device for measuring small flow rates of gaseous media. For the design and construction, materials were used to create a local pressure resistance and thus allow the pressure gradient to be measured upstream and downstream of the measuring element. The proposed measuring devices can serve as an alternative to actual measuring devices for detecting the instantaneous quantity flowing in the measuring assembly. The results obtained from the experimental measurements are used to determine the characteristics of the proposed measuring elements. The aim is to establish dependencies that will serve for the use of the proposed measuring elements for research and educational purposes.

Citation:

Polivka Nikolas, Kizek Ján, Rimár Miroslav, Varga Augustín, Roth Juraj: Experimental Devices for Measuring Small Gas Flows, Advance in Thermal Processes and Energy Transformation, Volume 5, No.3, (2022), p. 45-54, ISSN 2585-9102. https://doi.org/10.54570/atpet

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