The Opportunity Analyses of Using Thermosyphons in Cooling Systems of Power Transformers on Thermal Stations

Nurpeiis, Atlant; Nemova, Tatiana

doi:10.1051/matecconf/20167201077

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…For an objective analysis of the of heat transfer mechanisms, it is necessary to obtain the data on the temperature distributions (T) or at least the gradients of T in individual sections corresponding to the evaporation, vapor transport, and condensation zones. Carrying out the analysis of the current state of the problem under consideration, active investigations in recent years of hydromechanics and heat transfer processes taking place in thermosyphons within the framework of rather complex mathematical models should be noted [12][13][14]. But the results of mathematical modeling obtained even in recent years using widespread ANSIS FLUENT packages [15,16] in many cases are not confirmed by the results of an experimental study of the main characteristics of thermo physical processes, primarily temperature fields.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of the influence of a thermosyphon filling ratio on a temperature distribution in characteristic points along the vapor channel height

2017

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Abstract.Results of experimental studies of heat transfer in a thermosyphon illustrating the influence of the filling ratio and the heat load on the temperature distribution in the vapor channel, evaporation and condensation zones are presented. The thermosyphon was made of copper and was 161 mm high with side walls 1.5 mm thick, bottom cover 2 mm thick, an internal dimmer of the evaporation part of 54 mm and an internal diameter of the vapor channel of 39.2 mm. Based on the results of experimental studies, temperature dependences were established in the characteristic cross sections of the thermosyphon on the heat flux value supplied to the bottom cover. In addition, a well-appearing thermosyphon self-regulation property has been found -the growth of the heat load in the evaporation zone in the range from 1940 to 7685 W/m 2 does not lead to a decrease in the heat removal intensity from the heat-release region.

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Section: Introductionmentioning

confidence: 99%

An experimental study of the influence of a thermosyphon filling ratio on a temperature distribution in characteristic points along the vapor channel height

2017

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Numerical analyses of the effect of a biphasic thermosyphon vapor channel sizes on the heat transfer intensity when heat removing from a power transformer of combined heat and power station

2016

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Numerical analyses of the effect of a biphasic thermosyphon vapor channel sizes on the heat transfer intensity was conducted when heat removing from an oil tank of a power transformer of combined heat and power station (CHP). The power transformer cooling system by the closed biphasic thermosyphon was proposed. The mathematical modeling of heat transfer and phase transitions of coolant in the thermosyphon was performed. The problem of heat transfer is formulated in dimensionless variables "velocity vorticity vectorcurrent function-temperature" and solved by finite difference method. As a result of numerical simulation it is found that an increase in the vapor channel length from 0.15m to 1m leads to increasing the temperature difference by 3.5 K.

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Mathematical modeling of heat transfer in a closed two- phase thermosyphon

Maksimov

Nurpeiis

2019

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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We suggested a new approach for describing heat transfer in thermosyphons and determining the characteristic temperatures. The processes of thermogravitation convection in the coolant layer at the lower cap, phase transitions in the evaporation zone, heat transfer as a result of conduction in the lower cap are described at the problem statement. The main assumption, which was used during the problem formulation, is that the characteristic times of steam motion through the thermosyphon channel are much less than the characteristic times of thermal conductivity and free convection in the coolant layer at the lower cap of the thermosyphon. For this reason, the processes of steam motion in the thermosyphon channel, the condensate film on the upper cap and the vertical walls were not considered. The problem solution domain is a thermosyphon through which heat is removed from the energy-saturated equipment. The ranges of heat flow changes were chosen based on experimental data. The geometric parameters of thermosyphon and the fill factors were chosen the same as in the experiments (height is 161 mm, diameter is 42 mm, wall thickness is 1.5 mm, ε=4-16%) for subsequent comparison of numerical simulation results and experimental data. In the numerical analysis it was assumed that the thermophysical properties of thermosyphon and coolant caps do not depend on temperature; laminar flow regime was considered. The dimensionless equations of vortex, Poisson and energy transfer for the liquid coolant under natural convection and the equations of thermal conductivity for the lower cap wall are solved by the method of finite differences. Numerical simulation results showed the relationship between the characteristic temperatures and the heat flow supplied to the bottom cap of thermosyphon. The results of the theoretical analysis are in satisfactory agreement with the known experimental data.

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The Opportunity Analyses of Using Thermosyphons in Cooling Systems of Power Transformers on Thermal Stations

Cited by 3 publications

References 14 publications

An experimental study of the influence of a thermosyphon filling ratio on a temperature distribution in characteristic points along the vapor channel height

An experimental study of the influence of a thermosyphon filling ratio on a temperature distribution in characteristic points along the vapor channel height

Numerical analyses of the effect of a biphasic thermosyphon vapor channel sizes on the heat transfer intensity when heat removing from a power transformer of combined heat and power station

Mathematical modeling of heat transfer in a closed two- phase thermosyphon

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