The paper discusses the use of the complex hot water system on the basis of solar energy and a coal-fired boiler in the Republic of Tajikistan. The purpose of the paper is the analysis of the annual work of hybrid hot water system in the sanatorium “Bahoriston” of the Republic of Tajikistan, and evaluation of the ecological significance of the object. The paper presents the results of the analysis of the system for 2014, savings of coal and preventing the emissions of CO2 when using solar energy for hot water system in the sanatorium “Bahoriston”.

The paper analyzes the modification of the Jiles-Atherton vector model of magnetic hysteresis of materials which is recommended to use in the case of application constant and variable magnetic fields with small amplitude. Such conditions occur in a number of electromechanical energy converters, magnetic suspension, with a magnetic nondestructive inspection.The method is applicable to other models of the vector of hysteresis. It is shown that even for materials with isotropic properties the linearized equations describe the hysteresis process of induced magnetic anisotropy. The findings apply to ferromagnetic materials, and can also be used to describe the hysteresis properties of high-temperature superconducting materials.

Growing popularity of renewable energy brings about negative effects for the power quality especially for harmonic levels of supply voltage. Voltage source inverters being inevitable for operation of renewable energy can produce significant amounts of current harmonics in power grids. This paper provides the analysis of current harmonic sources within the inverter and then introduces the Simulink model of three-phase inverter. Derived model defines the current harmonic levels of inverter in regard to the supply voltage distortion. The model validation is done by comparing the modeling results with measurement data. Finally, the analysis of frequency-dependent characteristics of voltage source inverter reveals factors with critical impact on current harmonic emission of inverter.

In the article, the problems of the traditional energy sector and the prospects associate with the use of hydrogen as an energy source. The article places the hydrogen energy and systems of energy supply based on hydrogen fuel cells in the structure of the Russian energy sector. Moreover, it formulates the proposals for improving the strategic management of the hydrogen energy and the introduction of public instruments to stimulate the application of hydrogen fuel and fuel elements for power supply in various industries and areas of management.

The article deals with the improvement of the food and pharmaceutical industry heat-exchange equipment. Moreover, the article shows a problem of relevance of evaporation improvement in the technology of biologically active additives (BAA) from wild-growing vegetable and presents the results of experiments on the device with infrared heating of liquid through a free surface with the vortex for mated from the impeller rotation. The relations between size and form of vortex and a heating rate are shown. The scheme of the vacuum evaporator with the combined heating is offered. The possible usage of electrochemical generator on oxyhydrogen cell for power supply is highlighted.

In this article, the authors review the nitric oxide suppression methods by influencing on the generating process. The study showed the relations for degree of nitric oxide weakening in cooling flame intensification, water injecting to furnace, furnace gases recirculation using, fuels emulsification, staged or fuel combustion. The authors establish connections between a set of parameters, which have impact on finite nitric oxide concentration value. According to these relations, it can be possible to assess the influence of one factor or another. The study includes calculations of nitric oxide suppression degrees, which show a good agreement with the results of full-scale experiments. The results of the study can be used in power plants with low nitrogen oxides impact engineering.

The article provides predictive analysis and calculation of concentrations of benz(a)pyrene, carbon monoxide, ash and coke particles in the combustion products promising coal-fired boiler with ultra supercritical parameters. Furthermore, the article defines emission limit values of benz(a)pyrene depending on the operating characteristics of the boiler PK-37 and types of coal fuel.

In order to ensure low-emission combustion of coal the authors of this article provide the optimal temperature levels of use of fuel with high ash content. When the dispersion of carcinogenic emissions to the maximum ground level concentrations, it is proposed time of stay of products of incomplete combustion in the atmosphere until full conversion of toxic substances. The article analyzes of regulation peculiarities of benz(a)pyrene emissions from heat-generating installations in the dispersion of combustion products in air.

The paper is devoted to the numerical modeling of benz(a)pyrene emissions dispersion in air. For boilers of low heat capacity that combust coal and natural gas, the paperdetermines the limiting concentration levels of benz(a)pyrene in the combustion products and analyzes the influence of operating factors (heat load, the excess air ratio) on the formation of the final content of benz(a)pyrene in flue gases.

In this paper, the authors define the coefficients of turbulent diffusion, the maximum distance for observation of maximum ground level concentrations when the dispersion of gaseous emissions from the combustion of coal fuel and natural gas. Prediction of ground concentration of benz(a)pyrene allows steps to determine and optimize the size of the sanitary protection zone of the heat-generating enterprise, which is particularly important in dense urban areas.

The paper considers the options for interferometric shooting with synthetic aperture radar (SAR) located aboard an aircraft carrier. Moreover, the paper researches the factors that affect the accuracy characteristics of SAR interferometer, and identifies the specificity of radar interferometric sensing, allowing engineers to minimize the error of the local topography estimation for each of the variants of the interferometer construction.

This paper describes the obtained results on working-out and designing the efficient neural network classifier of barriers to the movement of the train. The developed neural network classifier is based on the original neural network related to a multilayer perceptron. The classifier registers and processes video and other information from the locomotive vision system.

The article presents the results of research on the development of a fully integrated structure of the flywheel energy storage system (FESS) with combined magnetic suspension with HTS. The obtained technical solutions make it possible to provide a stable levitation of the flywheel, to non-contact regulate the force of thrust bearing with permanent magnet in the vacuum chamber of FESS, perform an initial centering of the flywheel and operationalize a safety bearing in case of accidents. These functions are performed by constructive elements, which controlled by a magnetic field and combined with the magnetic suspension. The theoretical results are confirmed by experiments on laboratory models of FESS. Application of FESS allows engineers to improve reliability of power supply, electric transport, more efficient use of promising new sources of hydrogen energy. 

The article describes the development of a model of an uninterruptible power supply for low-voltage direct current grids. Basic components of the model are supercapacitors as an energy storage and bidirectional DC-DC power converter as a matching system between the energy storage and an electricity consumer. A power converter control system model that allows keeping currents and voltages of circuit elements in permissible limits in various modes of operation of the uninterruptible power supply with consideration for application peculiarities of supercapacitors has been designed. The necessity of creation of the device and opportunities of its usage are discussed, directions for future research on the subject are suggested.

The authors study thermal processes of dense-phase particulates baking and sintering. The article considers an up-to-date research and training problem of these thermally-activated processes optimization on conveyor-based calciners. The study includes the problem of programmable dense-phase warming, considering kiln`s technical restrictions and technology abilities of burning mechanism. The authors establish a task of burning mechanism optimal control, which can be solved by converting into multicriteria optimization. Control parameters: heat-transfer agent`s temperature at dense bed entry and its sweeping velocity. Control criterion: a reacting degree minimum and sintering of raw material. The limitations are set on: heat rate, temperature gradient and others, concerning with technical features of an aggregate. The study reveals a condition, forming a fading because of endothermic physicochemical transformations` heat absorption heat wave, which penetrates into the layer and intensifies decarbonization and sintering prosseses, providing the floor price on power imputs. Considering the obtained results, the authors present the operation conditions of conveyor-based kiln, providing resources and energy saving in particulates thermal preparation technology. The article deals with an applicability as alternative energy source, oxyhydrogen accumulator – a source of power protection.

Surface-based radar system can be used for remote sensing of characteristics of sea arctic ice fields, such as speed and direction of ice motion, distance to an ice floe and thickness of ice. For this purpose, we offered multi-channel coherent interferometric radar system that operates on one wavelength (8 mm). The radar system is design to use pulse (with wide bandwidth) compression techniques, coherent integration, doppler and interferometric processing to obtain high loop sensitivity and high resolution on speed, range and altitude. Radar data are acquired line by line while rotating the transmitting and receiving antennas about a vertical axis. In this article the design, measurement principles, simulation results and characteristics of surface-based radar are presented.