Energy and energy efficiency

New methods and means of mathematical modelling of induction melting processes of copper have been developed. They consist in simultaneous consideration of nonlinear properties of materials and features of three-dimensional geometry of elements of the electrotechnical complex. Means of mathematical modelling of three-dimensional inhomogeneous electromagnetic and thermal fields with strong interconnections, arising in the elements of the electrical complex in the process of induction melting of ultrapure copper and the manufacture of wire rod from it, have been developed.

About 70 to 75% of the energy consumed by the elements of transmit modules (TM) for active phased antenna arrays (APAA) is converted into heat. This heat, if dissipated inefficiently, can cause the element base to overheat, thus reducing the reliability of the radar. The task of ensuring the normal thermal regime of TMs for APAAs is complicated by the large-scale integration of electronic components inside the TMs.

Complex study and scientific substantiation of energy hubs concept using possibilities as unit of integrated energy supply systems in Ukraine with the purpose of technical substantiation solutions for the development and creation of their operation control modes models, which helps to ensure optimal flow distribution between energy sources and consumers with consumers energy use efficiency increase.

The method of synthesis of optimal regulators of multidimensional, nonlinear systems, which are able to solve the problems of systemwide management of transient modes of the united electric power system (UPS) in real time mode, taking into account the restrictions on the resources of the means of regulation and the allowable limits of deviation of the regime parameters by forecasting the vectors of future states of the nonlinear system with the subsequent quadratic optimization with the given restrictions, has been developed

The autonomous power supply system for local object based on the photovoltaic panels and a buffer battery has been developed. Such system allows to balance the generation and consumption of energy. A mathematical model of the functioning of a complex power supply unit based on renewable energy sources has been developed. This model takes into account the climatic and meteorological conditions of the locality for determination of the optimal ratio of the installed capacities of different sources, and a generalized model of the coordinated operation of the generating equipment and the storage subsystem

Functionality of Smart Houme has certain limitations, among which is the inability to analyze the activity of the residents, determine its impact on energy consumption, identify the physical state of the user by his activities. There are no solutions that would be able to solve this
problem today. One approach is to use the activity analysis of binary motion sensors. The advantage of this approach is the low cost of implementation and privacy of the residents. The system functions in real time.

A new technical solution is proposed that improves and simplifies the mixture process using the flashboiling effect and superheating. An experimental model of the developed liquefied gas engine power system in the liquid state is designed, which allows to improve the energy and environmental performance of the engine, to reduce the consumption of expensive traditional fuel and to bring cheap environmentally friendly gas fuels to the engine.

The autonomous power supply system for local object based on the photovoltaic panels and a buffer battery has been developed. Such system allows to balance the generation and consumption of energy. A mathematical model of the functioning of a complex power supply unit based on renewable energy sources has been developed.

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.