scholarly journals THE MATHEMATICAL MODEL OF THE HEAT EXCHANGE PROCESS IN THERMOELECTRIC GENERATOR DESIGNED FOR RECOVERY OF ENERGY OF DOMESTIC HEATING OVEN

2021 ◽  
Vol 4 (2.2) ◽  
pp. 113-119
Author(s):  
M.B. LITVINOVA ◽  
О.D. SHTANKO ◽  
S.O. KARPOVA ◽  
K.A. YANOVSKA
Keyword(s):  
Mathematical Model ◽  
Heat Exchange ◽  
Thermoelectric Generator ◽  
Exchange Process ◽  
Domestic Heating ◽  
Heat Exchange Process ◽  
The Mathematical Model

Semiempirical Method of Boiling Expectation Time Calculation in Falling Wavy Liquid Film

2012 ◽  
Vol 7 (3) ◽  
pp. 78-83
Author(s):  
Andrey Chernyavskiy ◽  
Aleksandr Pavlenko
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Thermal Conductivity Coefficient ◽  
Exchange Process ◽  
Semiempirical Method ◽  
Liquid Films ◽  
Wave Characteristics ◽  
Time Calculation ◽  
Heat Exchange Process ◽  
The Mathematical Model

The Mathematical model which allows to calculate boiling expectation times in falling wavy liquid films on nonsteady heat release has been represented. It has been shown that it is necessary to take a convective constituent of a heat transfer into account in heat exchange modeling in falling films. The effective thermal conductivity coefficient which invlolves a convective constituent of a heat transfer calculated from average wave characteristics using Vorontsov method has been used. The method of accounting of the wave moving influence on a heat exchange process has been presented. The comparison of results of a numerical simulation and experimental data has been done

scholarly journals Mathematical model of heat transfer through a conductive pipe

2021 ◽  
Author(s):  
Eduard Marusic-Paloka ◽  
Matko Ljulj ◽  
Igor Pazanin ◽  
Josip Tambaca
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Heat Exchange ◽  
Asymptotic Analysis ◽  
Exchange Process ◽  
Heat Exchange Process ◽  
Effective Description

The standard engineer's model for heat transfer between the fluid flowing through the pipe and the exterior medium neglects the effects of the pipe's wall. The goal of this paper is to prove that they are not always negligible. Comparing the ratio between diffusivities of the fluid and the wall with the wall's thickness, using rigorous asymptotic analysis, we find five different models for effective description of the heat exchange process.

scholarly journals Multi-criterion parameters optimization of the heat exchanger element air heating system of a building

2018 ◽  
Vol 251 ◽  
pp. 03001
Author(s):  
Andrei Melekhin
Keyword(s):  
Mathematical Model ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Exchange Process ◽  
Heating System ◽  
Parameters Optimization ◽  
Heat Output ◽  
Maximum Heat ◽  
Air Heating ◽  
Heat Exchange Process

Air heating systems of buildings are resource-consuming systems, for this reason, improving their resource efficiency appears to be of great significance. The author have developed a mathematical model of process of heat exchange in heat exchange surfaces of apparatuses with the solution of multicriteria optimization problem, an optimal range of managed parameters influencing the process of heat exchange with minimal metal consumption and the maximum heat output fin heat exchanger, the regularities of heat exchange process with getting generalizing dependencies distribution of temperature on the heat-release surface of the heat exchanger engineering systems of buildings, defined convergence of the results of research in the calculation on the basis of theoretical dependencies and solving mathematical model. Finding the best managed of the parameters of the heat exchanger element air heating system of a building is possible with the developed by the author of a comprehensive method of research based on multi-criteria parameters optimization with the introduction of empirically obtained data.

COMPUTER SIMULATION OF FLOW IN CORRUGATED CHANNEL OF PLATE HEAT EXCHANGER

2020 ◽  
pp. 51-58
Author(s):  
Л. А. Кущев ◽  
В. Н. Мелькумов ◽  
Н. Ю. Саввин
Keyword(s):  
Computer Simulation ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
High Speed ◽  
Exchange Process ◽  
Plate Heat Exchanger ◽  
System Stability ◽  
Plate Heat ◽  
Corrugated Channel ◽  
Heat Exchange Process

Постановка задачи. Рассматривается теплообменный процесс, протекающий в модифицированном гофрированном межпластинном канале интенсифицированного пластинчатого теплообменного аппарата с повышенной турбулизацией теплоносителя. Необходимо разработать компьютерную модель движения теплоносителя в диапазоне скоростей 0,1-1,5 м/с и определить коэффициент турбулизации пластинчатого теплообменника. Результаты. Приведены результаты компьютерного моделирования движения теплоносителя в межпластинном гофрированном канале оригинального пластинчатого теплообменного аппарата с помощью программного комплекса Аnsys . Определены критерии устойчивости системы. Выполнено 3 D -моделирование канала, образуемого гофрированными пластинами. При исследовании процесса турбулизации были рассмотрены несколько скоростных режимов движения теплоносителя. Определен коэффициент турбулизации Tu, %. Выводы. В результате компьютерного моделирования установлено увеличение коэффициента теплопередачи К, Вт/(м ℃ ) за счет повышенной турбулизации потока, что приводит к снижению металлоемкости и уменьшению стоимости теплообменного оборудования. Statement of the problem. The heat exchange process occurring in a modified corrugated interplate channel of an intensified plate heat exchanger with an increased turbulence of the heat carrier is discussed. A computer model of the coolant movement in the speed range of 0.1-1.5 m/s is developed and the turbulence coefficient of the plate heat exchanger is determined. Results. The article presents the results of computer modeling of the coolant movement in the interplate corrugated channel of the original plate heat exchanger using the Ansys software package. The criteria of system stability are defined. 3D modeling of the channel formed by corrugated plates is performed. In the study of the process of turbulence several high-speed modes of movement of the coolant were considered. The turbulence coefficient Tu, % is determined. Conclusions. As a result of computer simulation, an increase in the heat transfer coefficient K, W/(m ℃) was found due to an increased turbulization of the flow, which leads to a decrease in metal consumption and a decrease in the cost of heat exchange equipment.

scholarly journals Numerical analysis of heat exchange process in the biomass carbonisation reactor

2019 ◽  
Vol 252 ◽  
pp. 05019 ◽  
Author(s):  
Robert Zarzycki ◽  
Justyna Jędras
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Numerical Analysis ◽  
Exchange Process ◽  
Geometrical Model ◽  
Heating Time ◽  
Heating Process ◽  
Hot Air ◽  
Cyclic Operation ◽  
Heat Exchange Process

The study presents the problem of heat exchange in the biomass carbonisation reactor with cyclic operation. Based on the actual parameter of the biomass carbonisation reactor, a geometrical model was developed, and the computation of the heating process was conducted for two cases: an empty reactor and a filled reactor. Its result demonstrated that for the analysed configuration of the reactor, the process of heating biomass in the containers is limited by the capability of heat transfer to the biomass in the container. The results suggest opportunities for the improved heat exchange in the reactor and, accordingly, shortening heating time through installation of the system that forces circulation of hot air inside the reactor.

scholarly journals Heat exchange process intensification in solar collectors

2019 ◽  
Vol 698 ◽  
pp. 055027
Author(s):  
A P Pirozhnikova ◽  
M A Govorunov ◽  
T L Pirozhnikova ◽  
G E Muro
Keyword(s):  
Heat Exchange ◽  
Exchange Process ◽  
Process Intensification ◽  
Solar Collectors ◽  
Heat Exchange Process
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