Preface

the XII All-Russian Conference “Thermophysics and Power Engineering in Academic Centers” (TPEAC 2021) October 25-27, 2021, Sochi, Russia The All-Russian scientific conference “Thermophysics and Power Engineering in Academic Centers“ (TPEAC-2021) continues series of conferences (workshops) on thermophysics and heat power engineering. Since the first conference until now, the principal organizer of the conference is the Kutateladze Institute of Thermophysics, SB RAS. The 1st Workshop of the University Departments and Research Teams in Siberia and the far East specializing in thermophysics was held in Novosibirsk in 1978. Since then, the geographical spread of the Conference expanded every year involving various research centers: Tomsk, 1980; Krasnoyarsk, 1982; Vladivostok, 1984; Kemerovo, 1986; Ulan-Ude, 1988. The 7th Workshop was held in Novosibirsk, September 9-12, 1990, at the Institute of Thermophysics SB RAS. Workshop of Universities in Siberia and Far East on Thermophysics and Heat Power Engineering, dedicated to the 85th Birthday of the Workshop founder, academician S.S. Kutateladze, was held in Novosibirsk, October 6-8, 1999, at the Institute of Thermophysics SB RAS, and the Novosibirsk State Technical University (NSTU). Since 1999 new series of workshops started. The 2nd Workshop was held in Tomsk, 2001, at the Tomsk Polytechnic University (TPU); 3rd - in Barnaul, 2003, at the Altai State Technical University; 4th - in Vladivostok, 2005, at the Far-East State Technical University; 5th - in Irkutsk, 2007, at the Irkutsk State Technical University. Since 2009, when the 6th Workshop was held in Krasnoyarsk at the Siberian Federal University, it acquired the status of an All-Russian conference. The 7th All-Russian Workshop of Universities on Thermophysics and Power Engineering was held in Kemerovo, 2011, at the Kuzbas State Technical University; 8th - in Yekaterinburg, 2013, at the Ural Federal University. Since 2015, when the 9th Workshop was held in Kazan, at the Kazan State Engineering University, it acquired the status of an international conference. International Conference “The 10th Workshop of Universities on Thermophysics and Power Engineering“, was held in Moscow, 2017, at the Moscow Engineering University. The 11th All-Russian scientific conference with international participation “Thermophysics and Power Engineering in Academic Centers“ (TPEAC-2019) held based on the Peter the Great St. Petersburg Polytechnic University (SPbPU), Saint Petersburg. List of “Thermophysics and Power Engineering in Academic Centers” (TPEAC 2021) October 25-27, 2021, Sochi, Russia, Editorial Committee, Organizing Committee, Scientific Committee, Members of the Scientific and Advisory Committee and this titles are available in this pdf.

Assessment of effectiveness of organizational measures for prevention of COVID-19 among employees of large industrial enterprises

According to the regional information fund of social and hygienic monitoring, 1518 cases of 01.07.2021 diseases were registered among those working at industrial enterprises of the Republic of Buryatia as of COVID-19, of which the share of the joint-stock company Ulan-Ude Aviation Plant (hereinafter – U-UAP, aviation plant) accounts for 30.8 % or 467 cases, in the public joint-stock company Territorial Generating Company No. 14 (hereinafter – TGC-14, heat power plant) – 15.7 % or 239 cases. The incidence rate of COVID-19 in U-UAP amounted to 871.76 per 10 thousand workers, in TGC-14 – 2280.53 per 10 thousand workers. The evaluation of the effectiveness of COVID-19 prevention showed that the complex of sanitary and anti-epidemic (preventive) measures taken in the pandemic among those working at the aviation plant ensured the control of the spread of the incidence of coronavirus infection by 2.6 times, compared with the heat power plant. Keywords: disinfectants, new coronavirus infection of COVID-19, industrial enterprises, sanitary and anti-epidemic (preventive) measures, Republic of Buryatia.

Mapping the Surface Heat of Luminescent Solar Concentrators

Luminescent solar concentrators (LSCs) have been widely studied for their potential application as building-integrated photovoltaics (BIPV). While numerous efforts have been made to improve the performance, the photothermal (PT) properties of LSCs are rarely investigated. In this report, we studied the PT properties of an LSC with a power conversion efficiency (PCE) of 3.27% and a concentration ratio of 1.42. The results showed that the total PT power of the LSC was 13.2 W, and the heat was concentrated on the edge of the luminescent waveguide with a high heat power density of over 200 W m−2.

Influence of Selected Factors on the Duration and Energy Efficiency of Autoclave Steaming Regimes of Non-Frozen Prisms for Veneer Production

This paper puts forward a methodology for calculating the duration and energy efficiency of regimes for autoclave steaming of wooden prisms for veneer production at limited heat power of the steam generator, depending on the dimensions of the prism’s cross section, wood moisture content, and loading level of the autoclave. The methodology is based on the use of two personal mathematical models: the 2D non-linear model of the temperature distribution in non-frozen wooden prisms subjected to steaming and subsequent conditioning in an air medium, and the model of the non-stationary heat balance of autoclaves for steaming wood materials. Using the suggested methodology, the calculation and research into the duration and energy efficiency of regimes for heating of beech prisms have been carried out. The variables used were an initial temperature of 0 °C, cross-section dimensions 0.3 × 0.3 m, 0.4 × 0.4 m, and 0.5 × 0.5 m, moisture content of 0.4, 0.6, and 0.8 kg·kg−1, during their steaming in an autoclave with a diameter of 2.4 m, length of 9.0 m and loading level of 40, 50, and 60% at a limited heat power of the steam generator, equal to 500 kW. It has been determined that the duration of the autoclave steaming regimes, at a loading level of 50% being most often used in the practice beech prisms with moisture of 0.6 kg·kg−1, does not exceed 9 h, 13 h, and 20 h for prisms with cross-section 0.3 × 0.3 m, 0.4 × 0.4 m, and 0.5 × 0.5 m, respectively. This duration is less than half of the corresponding duration of the steaming regimes at atmospheric pressure. The energy needed for warming up such prisms themselves does not exceed 60, 65, and 69 kWh·m−3, respectively, and the energy consumption of the whole autoclave then is equal to about 90, 99, and 105 kWh·m−3, respectively. The energy efficiency of the autoclave steaming regimes changes between 62.2% and 68.8% for the studied ranges of the influencing factors and it turns out to be more than 2–3 times larger in comparison with the efficiency of the steaming at atmospheric pressure. The methodology can be used for various calculations with ANSYS and to create the software for systems used for computing and model-based automatic realization of energy-efficient regimes for autoclave steaming of different wood materials from various species. This could be useful in developing similar methodologies in different areas of thermal treatment at increased pressure of various capillary-porous materials of plant or technical origin.