Boris Vladimirovich Borisov

Relevance. The operation of any heating systems is determined by the interrelationship of many physical processes. Recently, for heating large premises, it has been increasingly proposed to use heating systems based on gas infrared heaters of various designs. Such systems are most relevant for large industrial premises, as they are capable of creating favorable living and working conditions in a local work area without significant costs for heating the rest of the premise. When designing complex systems, an important factor is the use of simple relationships to assess the trends of average values ​​of parameters aimed at achieving the desired result. There is a need to set the main dimensionless criteria that determine a particular process within the framework of similarity theory. Aim. To state the basic relationships and dimensionless criteria for analytical engineering assessment of the average temperature over the volume of a premise and the dynamics of its change during heating the premise by a system based on the gas infrared heaters. Objects. Heating system with gas infrared heaters. Methods. Mathematical modeling was carried out within the framework of a 0D mathematical formulation. Results. The authors have stated the main relationships and dimensionless criteria for the analytical assessment of temperature and the dynamics of its change during heating of the premise by a system based on a gas infrared heater on the basis of the approach averaged over the entire volume of the premise. The results of calculations according to the obtained relationships are presented in comparison with the results of calculations according to the full 0D model, which are verified on the results of 2D modeling and experimental measurements.

Relevance. It is proposed to heat local work areas with systems based on gas infrared heaters, capable of directing radiative heat flow to reduce heating costs in large premises. However, the widespread use of gas infrared heaters is hampered by the existing difficulties with the preliminary assessment of convective-radiative heat flows movement, on which the number and location of heating devices depends. The preliminary assessment is complicated by the need in some cases for 3D modeling of complex physical processes. It is necessary to evaluate the possibility of replacing labor-intensive 3D modeling with a method for calculating a heating system using gas infrared emitters based on a 2D approach to reduce the time spent on calculations. Aim. To prove that the use of a two-dimensional model of the processes under consideration makes it possible to obtain the main characteristics of the thermal regime of the premises, making it possible to replace spatial modeling. Objects. Heating system with a light-type gas infrared heater and an air exchange system. Methods. Two-dimensional and three-dimensional mathematical modeling of conjugate heat transfer processes using the finite element method. Mathematical modeling was carried out in the COMSOL Multiphysics software environment using the modules: “Heat Transfer Interface in Liquids”, “Radiation between Surfaces” and “Turbulent Flow, k-ε Interface”. Results. The article presents the results of mathematical modeling performed in three-dimensional and two-dimensional formulations. The distribution of temperatures in the air and enclosing structures, as well as the flow lines of heated air and air, which was heating, in the volume of the premise are presented. The results of two-dimensional and three-dimensional modeling were compared. Satisfactory similarity of the calculated average air temperatures in the local working area was established based on the results. The difference was less than 2℃ for different spatial modeling approaches.

The formation of local areas in large buildings with regulated thermal conditions is an urgent task. The use of gas infrared heaters for this purpose raises questions on the utility of an air-exchange system and the monitoring of the combustion product concentration. In this study, the modeling of heat transfer processes on premises with a gas infrared heater and an air-exchange system was conducted. The carbon dioxide concentration in the local working area when using a light-type gas infrared heater was determined. The regularities of current formation for circulating air and combustion products on the premises at various air-exchange rates were analyzed. The profiles of CO₂ temperatures and concentrations in the local working areas on the left and right of the equipment model are shown. The article makes a conclusion about the influence of air velocity from the air-exchange system based on average values of carbon dioxide concentration on the premises and in the local working area. The possibility of increasing the temperature in the local working area without exceeding the permissible CO₂ concentrations (less than 1000 ppm) has been identified. The formulated approach allows us to predict the available modes of the air-exchange system to create the highest possible comfort heating parameters while maintaining an acceptable degree of air pollution from combustion products.

Link for citation: Borisov B.V., Vyatkin A.V., Kuznetsov G.V., Maksimov V.I., Nagornova T.A. Numerical analysis of the influence of the air exchange system configuration on the temperature regime of local working areas in a room with a gas infrared heater. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 2, рр. 7-16. In Rus. The relevance. The most promising option for an energy-efficient system for ensuring the scheduled thermal regime of local workplaces, which occupy a small area in large workshops, are the so-called «radiant» heating systems, the main part of which are gas infrared heaters. The main role in the formation of the thermal conditions of the local working area is played by the process of mixed convection (the air movement due to its heating by enclosing structures and flows that form the air exchange system). The analysis of the influence of the location of the air exchange system channels on the thermal regime of the local working area using a gas infrared emitter has not been performed so far. The main aim of the research is to analyze the influence of the position of the air exchange system’s openings channels on the temperature fields of local working areas near the equipment model based on the results of mathematical modeling. Objects: heating system using high-intensity gas infrared heater and air exchange system. Methods. Mathematical modeling was carried out within the framework of a two-dimensional model of conjugate heat transfer using the finite element method. The modules «The Heat Transfer in Fluids Interface», «Surface-to-Surface Radiation» and «The Turbulent Flow, k-ε Interface» of the COMSOL Multiphysics software environment were used for the numerical analysis of heat transfer processes Results. The paper introduces the results of mathematical modeling carried out to determine the influence of the position of the air exchange system’s channels on the temperature fields and the possibility of controlling the process of a scheduled thermal regime formation in local working areas when using a gas infrared heater. The temperatures and velocities fields, as well as the air temperature distribution along the height of the local working area for various options of the air exchange system’s inflow and outflow areas location are presented. Based on the results of the research, the main regularities of the processes of heat and mass transfer under the considered conditions were revealed. The possibility of controlling the processes of thermal regime formation of local working areas by varying the air exchange system channels position was also revealed. Ссылка для цитирования: Численный анализ влияния конфигурации системы воздухообмена на температурный режим локальных рабочих зон в помещении с газовым инфракрасным излучателем / Б.В. Борисов, А.В. Вяткин, Г.В. Кузнецов, В.И. Максимов, Т.А. Нагорнова // Известия Томского политехнического университета. Инжиниринг георесурсов. – 2023. – Т. 334. – № 2. – С. 7-16. Актуальность. Наиболее перспективным вариантом энергоэффективной системы обеспечения регламентного теплового режима локальных рабочих мест, занимающих малую долю площадей больших по размерам цехов, являются системы так называемого «лучистого» отопления, основной частью которых являются газовые инфракрасные излучатели. Основную роль в формировании теплового режима локальной рабочей зоны играет процесс смешанной конвекции (движение воздуха вследствие его нагрева ограждающими конструкциями и потоками, которые формирует система воздухообмена). До настоящего времени анализ влияния месторасположения каналов системы воздухообмена на тепловой режим локальной рабочей зоны с использованием газового инфракрасного излучателя не выполнялся. Цель: анализ по результатам математического моделирования с использованием модели влияния положения отверстий каналов системы воздухообмена на температурные поля локальных рабочих зон вблизи макета оборудования. Объект: система отопления с использованием газового инфракрасного излучателя светлого типа и системы воздухообмена. Методы. Математическое моделирование проведено в рамках двумерной модели сопряженного теплопереноса с применением метода конечных элементов. Для численного анализа процессов теплопереноса использовались модули «The Heat Transfer in Fluids Interface», «Surface-to-Surface Radiation» и «The Turbulent Flow, k-ε Interface» программной среды COMSOL Multiphysics. Результаты. Приводятся результаты теоретических...

Link for citation: Borisov B.V., Vyatkin A.V., Maksimov V.I., Nagornova T.A., Salagaev S.O. Analysis of energy efficiency increasing ranges for gas infrared heater. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 2, рр. 70-80. In Rus. Relevance. The article is devoted to the analysis of space heating systems using a light-type gas infrared emitter. For the effective use of these systems, appropriate recommendations for their use are formulated. In this relation the authors carry out a mathematical analysis of the dynamics of changes in time of averaged temperature values by the volume of the room, by the volume of enclosing structures (floor, ceiling, walls), by the volume of the local zone formed by temporary enclosing structures (screens). The temperature regime of the local zone formed by temporary enclosing structures in the form of screens is analyzed. The maximum temperatures of the average temperatures of the room and the local zone are determined for various modes of using the radiant heat flux. Purpose: to analyze methods and ranges for increasing the energy efficiency of heating systems using a high-intensity gas infrared heater. Objects: heating system using high-intensity gas infrared heater. Methods: mathematical model of the process using averaged temperatures over the premise volume, over the volume of enclosing structures (floor, ceiling, walls), experimental determination of the temperature field, mathematical modeling based on a two-dimensional approach. Results. The paper introduces the calculations results of the temperatures average values dynamics of the premise air, enclosing structures and local zone air, the maximum values of temperatures and the dynamics in time of heat flows involved in premise heating. A comparative analysis of the average premise temperature calculations with experimental temperature measurements and numerical simulation in a two-dimensional formulation is given. Based on the results of the analysis, directions for increasing the energy efficiency of heating systems based on gas infrared heater are formulated. Ссылка для цитирования: Анализ диапазонов повышения энергоэффективности газового инфракрасного излучателя / Б.В. Борисов, А.В. Вяткин, В.И. Максимов, Т.А. Нагорнова, С.О. Салагаев // Известия Томского политехнического университета. Инжиниринг георесурсов. – 2023. – Т. 334. – № 2. – С. 70-80. Актуальность. Статья посвящена анализу систем обогрева помещений с использованием газового инфракрасного излучателя светлого типа. Для эффективного использования данных систем формулируются соответствующие рекомендации по их применению. Для чего проводится математический анализ динамики изменения во времени осредненных значений температур по объему помещения, по объему ограждающих конструкций (пол, потолок, стены), по объему локальной зоны, образованной временными ограждающими конструкциями (ширмами). Анализируется температурный режим локальной зоны, образованной временными ограждающими конструкциями в виде ширм. Определяются максимальные значения температур осредненных температур помещения и локальной зоны при различных режимах использования лучистого потока теплоты. Цель: проанализировать методы и диапазоны повышения энергоэффективности систем отопления с использованием газового инфракрасного излучателя светлого типа. Объект: система отопления с использованием газового инфракрасного излучателя светлого типа. Методы: математическая модель процесса с использованием осредненных значений температур по объему помещения, по объему ограждающих конструкций (пол, потолок, стены), экспериментальное определение температурного поля, математическое моделирование на основе плоского двухмерного подхода. Результаты. Приводятся результаты расчетов динамики изменения осредненных значений температур воздуха помещения, ограждающих конструкций и воздуха локальной зоны, максимальных значений температур и динамики изменения во времени тепловых потоков, участвующих в процессе нагрева помещения. Приводится сравнительный анализ расчетов средней температуры помещения с экспериментальными измерениями температур и численным моделированием в плоской двухмерной постановке. По...

The creation of local heated areas in large-sized premises using systems based on gas infrared heaters has recently become the most rational alternative in terms of energy efficiency. However, the lack of information about the thermal characteristics in such areas limits the effective application of these systems. To determine the main thermal parameters characterizing the scheduled thermal conditions in heated local working areas of industrial premises, experimental and mathematical modeling of heat transfer processes in a closed area with the presence of equipment in it was carried out. The experimental area was equipped with a gas infrared heater and a model of the equipment (a horizontally oriented panel). The system of equations of thermal conductivity, radiant heat transfer, as well as energy and Navier–Stokes was solved by the finite element method. A significant influence of the equipment position on the temperature field and the air movement hydrodynamics in the local working area has been established. The equipment presence in the room intensifies the air movement due to thermal convection and, as a result, a more uniform temperature distribution over the local working area was obtained. Analysis of the obtained results shows the possibility to control the temperature fields’ formation in local working areas during the gas infrared heater operation by varying the position and configuration of the equipment in the room.

The method for identification of the triplet of kinetic parameters of a heterogeneous reaction using the data of the derivatographic analysis is proposed. This method is characterized by high accuracy and relative simplicity and it can be effectively realized using MS Excel software.

Using the methods of mathematical modeling, the formation and evolution of aerosol clouds of toxicants in the atmosphere from the chemical industry enterprises, thermal power engineering and rocket carriers of space vehicles is analyzed. The processes of dynamic interaction of drops between themselves and a two-phase flow, processes of agglomeration, crushing and evaporation of aerosol particles are taken into account. The results of numerical calculations are presented.

MATEC Web of Conferences, open access proceedings in Materials science, Engineering and Chemistry

MATEC Web of Conferences, open access proceedings in Materials science, Engineering and Chemistry