Energy and energy efficiency

The physical and mathematical models of the dynamics of the dense motion of a granular medium and the thermoelectric state of a single-phase mine electric furnace during high-temperature heat treatment of carbon material are formulated, on the basis of which the corresponding discrete and continuum numerical models of the physical fields of the electric calciner are developed taking into account the dense motion of the granular medium and chemical interaction.

Comparison of designs of heat exchangers with smooth-walled aluminum grooved heat pipes (AGHP) with a diameter of 8 mm and finned AGHP with an outer diameter of 43 mm. The use of smooth-walled AGHPs, on the one hand, results in a larger number of them in the heat exchanger compared to the finned AGHPs, but, on the other hand, results in a smaller pressure drop in the channels. On the basis of the experimental data, dependences were obtained for the calculation of the coefficients of heat exchange and aerodynamic resistance for a heat exchanger with smooth-walled AGHPs.

Comparison of designs of heat exchangers with smooth-walled aluminum grooved heat pipes (AGHP) with a diameter of 8 mm and finned AGHP with an outer diameter of 43 mm. The use of smooth-walled AGHPs, on the one hand, results in a larger number of them in the heat exchanger compared to the finned AGHPs, but, on the other hand, results in a smaller pressure drop in the channels. On the basis of the experimental data, dependences were obtained for the calculation of the coefficients of heat exchange and aerodynamic resistance for a heat exchanger with smooth-walled AGHPs.

An experimental electrical drive for electric buses and traks is developed and experimentally tested. Developed power converter for induction motor based electrical drive provides 100 kW of output power. Flux-torque (speed) control algorithms for induction motor are developed, implemented and experimentally verified. Developed nonlinear controller take into consideration motor's magnetizing curve provides asymptotic flux-torque (speed) tracking, torque per Ampere maximization (MTA) as well adaptation to stator and rotor resistances.

The main structural schemes of interrelations between the subjects of the thermal energy market are determined and the corresponding models of the thermal energy market are proposed depending on the localization level of the heat supply system. Effectiveness of the system was analyzed for two alternatives: monopoly and competition. Modeling the interaction of market participants was done using different technologies for the production of heat energy, in a competitive environment.

The new results were obtained on the principles of thermomolecular energetics (TME) as a new theory of the use of potential energy of intermolecular interaction on developed surfaces in applied applications of accumulators with high specific (volumetric) energy capacity, with less consumption of structural materials. Three samples of the new type of accumulator with a high specific energy capacity have been created, which work on the principles of thermomolecular energetics using heterogeneous lyophobic systems as a new working media.

The object of research work is electromagnetic processes in the system "power grid - power converter - non-stationary load". The aim of the work is to increase energy efficiency and resource saving by means of power electronics for the technology of obtaining highly reliable welding joints of heterogeneous materials.

As a result of the work, an energy saving power supply system was created for the university space vehicle - nanosatellite (NS) PolyITAN-2 of the 2U CubeSat format when solving an important applied task - full-scale nanosatellite measurements of the parameters of the lower Earth thermosphere in the international project "QB50". Energy saving is a necessary condition of long period of functioning of NS.

In order to improve the quality of cable products, the idea of a multi-level system of structural and parametric identification of objects of the electrical complex of the technological line for the production of domestic cable with polymeric insulation on ultrahigh voltage is aimed at the main task. Systems guarantee correct, optimal for the main indicator of the quality of the solution of the problem under real conditions of structural, parametric and signal uncertainty and space-time limited data.

The novel technology was developed of heat transfer, gasdynamics, and film cooling efficiency prediction of high-performance gas turbine blades providing high accuracy of calculations.This technology takes into consideration stationary conditions and rotation of of cooled surface, blowing ratio, external flow speed, surface geometric shape (flat, concave, or convex), surface indentations configuration (spherical or rectangular), multi-row of coolant supply.