Saturday, December 12. 2020
Research of Integrated Passive Methods of Heat Dissipation Intensification to Improve the Efficiency of Gas-Dynamic Temperature Stratification
Е.V. Tsvetova, V.N. Kovalnogov, R.V. Fedorov
Department of Heat and Power Engineering, Ulyanovsk State Technical University, Severny Venets str. 32, Ulyanovsk, 432027, Russia © European Society of Computational Methods in Sciences and Engineering Keywords: numerical simulation, gas-dynamic temperature stratification, dispersion flow, heat transfer coefficient, developed surfaces Mathematics Subject Classification: 65R20 Numerical methods for integral equations
Received: 04/09/2020, Revised: 20/10/2020, Accepted: 05/12/2020
Abstract: A possibility was analyzed to increase the efficiency of the gas-dynamic temperature stratification process through the use of complex passive methods of heat transfer intensification: developed surfaces - longitudinal fins on the heat transfer surface in the subsonic flow path; additives to the gas flow of the disperse phase with a twisting flow.
PACS: 02.60.Cb Numerical simulation; solution of equations
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Saturday, December 12. 2020
Numerical Simulation and Investigation of the Influence of the Characteristics of the Building Envelope on Energy Efficiency and Energy Saving Potential
Yu.E. Chamchiyan, V.N. Kovalnogov, R.V. Fedorov
Department of Heat and Power Engineering, Ulyanovsk State Technical University, Severny Venets str. 32, Ulyanovsk, 432027, Russia
Received: 03/09/2020, Revised: 15/10/2020, Accepted: 08/12/2020
Abstract: The heat engineering characteristics of external enclosing structures and their influence on the microclimate of the building are analyzed. Potential spheres in the field of providing microclimate for energy saving are considered. The potential for savings in the implementation of automated regulation of microclimate systems is presented.
© European Society of Computational Methods in Sciences and Engineering Keywords: numerical simulation, numerical methods, energy efficiency, energy saving, microclimate. Mathematics Subject Classification: 65R20 Numerical methods for integral equations
PACS: 02.60.Cb Numerical simulation; solution of equations
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Saturday, December 12. 2020
Influence of the Air Swirling Speed on the Processes of Joint Combustion of the Fuel-Air Mixture in the Active Combustion Zone of Power Plants
R.V. Fedorov, A.V. Chukalin, V.N. Kovalnogov, U.J. Mizher, M.M. Zamaleev
Department of Heat and Power Engineering,
Ulyanovsk State Technical University, Severny Venets str. 32, Ulyanovsk, 432027, Russia
Received: 01/09/2020, Revised: 15/10/2020, Accepted: 07/12/2020
Abstract: The search for new solutions in the field of energy, preventing negative impact on the environment, is one of the priority tasks for modern society. It is natural gas that has a stable position in the demand of the UES of Russia for fossil fuel. One of the promising areas is the use of biogas as a source of thermal energy for power plants. It has been established that the main difference between biogas and natural gas, which affects the density, calorific value, and speed of flame propagation, is caused by the presence of more than 30% carbon dioxide in its composition. Combined combustion of natural gas and biogas, subject to good mixing due to the tangentially swirling apparatus of the fuel-air mixture, can increase the stability of biogas combustion, reduce the maximum adiabatic temperature in the zone of active combustion of power boilers of TPPs, which in turn will lead to a decrease in the content of NOx, CO2 in products combustion. For the combustion of biogas at the power plants in operation at TPPs of the UES of Russia, it is important to carry out, on the basis of the theoretical data obtained on the effective combustion modes of fuels, the technical re-equipment of the burners. The paper presents a turbulence model k – ε RNG, which makes it possible to simulate the combustion of natural gas and biogas during tangential swirling of the air-fuel mixture. The qualitative characteristics of biogas, the quantitative content of NOx, CO2 in the combustion products, the temperature distribution in the zone of active combustion of fuel combinations - natural gas, biogas, natural gas / biogas is presented.
© European Society of Computational Methods in Sciences and Engineering Keywords: Numerical simulation, modeling, biogas, co-combustion, efficiency, emission reduction Mathematics Subject Classification: 65R20 Numerical methods for integral equations PACS: 02.60.Cb Numerical simulation; solution of equations
Tuesday, December 8. 2020
Effectiveness of the Probabilistic Assessment to Analyse of the Tall Building Safety using FE Method
J. Kralik, J. Kralik, jr. and P. Rosko
Faculty of Civil Engineering, Slovak University of Technology in Bratislava, 810 05 Bratislava, Slovakia and Centre of Mechanics and Structural Dynamics 1010 Vienna University of Technology Vienna, Austria Received 01/03/2020, Revised 21/07/2020, Accepted 30/10/2020
Abstract: This paper describes some experiences from the deterministic and probabilistic analysis of building structure reliability and safety. There are presented the methods and requirements of Eurocode EN 1990, standard ISO 2394 and JCSS. On the example of the probability analysis of the reliability of the tall buildings is demonstrated the affectivity of the probability design of structures using FE Method. © European Society of Computational Methods in Sciences and Engineering Keywords: Extreme environment effect, earthquake, nonlinearity, probability, sensitivity, RSM, ANSYS Mathematics Subject Classification: 00A69, 49Mxx
Tuesday, December 8. 2020
Probabilistic Assessment to Analyze of Steel Hall Collapse due to Extreme Wind Impact
J. Kralik and J. Kralik, jr.
Department of Structural Mechanics,
Faculty of Civil Engineering,
Slovak University of Technology in Bratislava,
810 05 Bratislava, Slovakia
Received 28/02/2020, Revised 21/07/2020, Accepted 28/10/2020 Abstract: Engineering structures are designed to resist all expected loadings without failure. However, structural failures do happen occasionally, mainly due to inadequate design and construction, especially for extreme loads. The main aim of this contribution is to find out the maximum load carrying capacity of the steel frame. Account is taken of nonlinear material behavior and geometry of member, in combination of the stability analysis. © European Society of Computational Methods in Sciences and Engineering Keywords: Extreme wind, nonlinearity, probability, sensitivity, NPP, RSM, FEM, ANSYS Mathematics Subject Classification: 00A69, 49Mxx
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