At present, progress in building materials science and the construction industry is gaining in importance. New technologies provide high quality products, its environmental safety, efficient use of raw materials, saving resources. The creation of high technologies is possible only with the use of the latest achievements in physics, chemistry and other basic sciences. To date, the most promising are nanotechnology.

Keywords: nano-concrete, natural raw materials, additives, macro-reinforcement, fiber, nanostructure, crack resistance

The article analyzes the problems and prospects for the development of green technologies and green construction in Russia and the world as as well. The author provides us the information about the outstanding examples of green buildings in the world. The dynamics of construction of green buildings for the period from 2000 to 2018 has been revealed in the article. It is also presented the advantages of introducing green technologies in the construction of buildings with respect to all participants in the construction process. By opinion of the author the important role in the part of stimulating the development of green construction plays the state, legislative initiatives. Factors restraining the growth of eco-sustainable construction in our country are revealed

Keywords: green technology, ecological construction, sustainable development, green building, resource saving, green standards, energy efficiency

A thin circular disk is considered, the material of which exhibits elastic and plastic properties under thermal and force influences. In the central part of the disk, the temperature field is uniform. At the boundary of the disk, pressure and a constant temperature are set. Approximation of a plane stress state is adopted. The additive form of the connection of full, elastic, plastic deformations and deformations under free thermal expansion is considered. Elastic deformations are expressed in terms of stresses according to Hooke's law. A linear approximation of the dependence of the plasticity limit on temperature is proposed. The possibility of neutral loading of the central region of the disk and its external boundary is shown. Especially distinguished is the condition for the plasticity of Tresca.

Keywords: mathematical modeling, elastoplastic body, plane stress state, piecewise-linear plasticity conditions, plastic flow theory, thermoelastic plasticity

The steps of constructing an algorithm for calculating the stressed and strained state of a thin circular disk experiencing thermal and force effects are discussed. A homogeneous temperature field is created in the central part of the disk. Within the framework of the theory of the flow of an ideal elastoplastic body, conditions of general plasticity are considered. It is assumed that the plasticity limit for uniaxial tension is common for all plasticity conditions. Dependencies between the disk radius, the temperature of the central region of the disk and the external pressure, which determine the appearance of plastic regions, are established. For piecewise-linear plasticity conditions of general form, analogous dependences are defined, when singular plasticity regimes are realized at elastoplastic boundaries. For different values ​​of the input parameters of the problem, the stresses, equivalent stresses and the hodograph of the stress vector are given.

Keywords: mathematical modeling, elastoplastic body, plane stress state, piecewise linear plasticity conditions, plastic flow theory, thermoelastic plasticity

The article considers the experimental estimation of the heat transfer coefficient in a hybrid immersion cooling system with contact point cooling and dry zones. The change in the heat transfer coefficient is made through a change in the Reynolds number for the flow of the coolant in the immersion cooling system. The experimental investigation is carried out on the basis of a numerical simulation model of the process under study. As a result, the dependences of the thermal resistance of the processor-heat exchanger system on the heat transfer coefficient and on the Reynolds number of the turbulent flow were obtained, and the results with the simulation results were estimated. It is found that, with an increase in the Reynolds number, the heat transfer intensification is weaker than the theoretical one. The refinement coefficients for the case under consideration are found.

Keywords: processor, heat flow, thermal resistance, Laplace equation, turbulent flow, Reynolds number, heat transfer, immersion cooling system, immersion cooling system, cavitation

The paper presents the development of a system for detecting the status of control and protection system drives (CPS) of a water-water power reactor by vibration signals using the frequency components method. Results of experimental researches at the "Izhorskiy Plant" PO are given. Spectral analysis is used to isolate the frequency ranges of the CPS diagnostic signal spectra, and to develop diagnostic standards. The work describes formation of reference diagnostic vectors (a set of diagnostic features in the form of a binary code) and their comparison with the current state. The developed standards formed the basis for the system of automatic recognition of the object state. The introduction of such a system will simplify the task of collecting, analyzing, comparing drives data during operation at nuclear power plants, as well as improving methods of testing and diagnosing CPS drives, which should positively affect the reliability and resource of equipment.

Keywords: CPS drive, technical diagnostics, spectral analysis, diagnostic vector, state recognition

In this study, the task is to simulate the cooling system of supercomputers with a heat pump on the reverse Stirling cycle by numerical simulation of heat transfer processes in the object under study. The results of numerical simulation of heat transfer processes in the superheater processor cooling system with a heat pump on the reverse cycle are presented. A numerical model of the heat transfer process was investigated. As a result, the dependencies of the required thermal lift of the heat pump are obtained taking into account the thermal resistance of the system. The first liquid cooling circuit - the cold cylinder of the heat pump and the hot cylinder system - the second liquid cooling circuit, depending on the heat transfer coefficient of the heat pump.

Keywords: processor, heat flow, thermal resistance, Laplace equation, heat pump, heat exchange, Stirling backflow, cooling system

The work of the sensors of passenger traffic control in conditions of a dense stream of people in the controlled section of the doorway was conducted. The results showed the possibility of determining the direction of movement of a person due to a change in the distance between the sensor and the moving person. The interference due to the high density of passenger traffic, which, however, does not lead, however, to the development of the corresponding algorithms, to false alarms of the sensors is detected. However, additional field studies are required on the vehicle of the passenger counting device based on ultrasonic distance measurement sensors

Keywords: passenger, ultrasound, passenger transport, road transport, distance sensor, Arduino, bus

The field studies of the device in a controlled section of the doorway of the trolleybus were carried out. Studies have shown the operability of the device with the appropriate information processing algorithm, which allows to extract an information signal from short-term interference. It is necessary to carry out on the vehicle additional field studies of the passenger counting device based on ultrasonic proximity sensors aimed at eliminating the reflection of interference from the walls and, accordingly, improving the accuracy of counting the number of incoming and outgoing passengers.

Keywords: passenger, ultrasound, passenger transport, road transport, distance sensor, Arduino, trolleybus

The article discusses the development of a mathematical model in the deterministic form of recording the main dependences that determine the process of vaporization in a steam power plant to produce heat and electricity when used as a source of biofuel energy. Theoretically, the parameters of the working process of the installation were calculated; thermal efficiency of the turbine; heat useful used in the boiler unit; the efficiency of the boiler; the percentage of heat loss with exhaust gases; the estimated hourly consumption of solid biofuel; the annual amount of heat obtained by burning the mass of crop residues; the theoretical combustion temperature of crop residues; the actual steam velocity in the Laval nozzle; the heat loss in the nozzle, etc.in the course of calculations with the help of a multi-factor experiment, the parameters and the shape of the turbine blade used in the installation were obtained. Using the presented mathematical model given in the article and the data of the Federal state statistics service, we obtain the numerical values of the working process of the installation working on biofuel. For convenience, all the summary theoretical data of the numerical values of the basic theoretical dependences of the mathematical model of the working process of the layout of the steam power plant for heat and electricity was included in the table. Thus, theoretical studies show the possibility of producing electricity of the required quality using straw to produce high-pressure steam.

Keywords: mathematical model the working process of the pressure volume, a steam turbine,producing heat and electric energy, biofuels

A scheme of the HVAC system with local (zone) air handling units providing the possibility of heat and humidity treatment of air is developed to maintain the set temperature and relative humidity of the supply air. Features of regulation of moisture content of supply air in HVAC systems are considered and an analysis of air processing processes was carried out using the I-d diagram for the warm and cold periods of the year. A method for control the moisture content of the supply air is described, which allows more accurately to maintain the air parameters when the heat and humidity loads in the serviced rooms change.

Keywords: multizonal HVAC system, local (zone) air handling units, heat and moisture exchange, I-d-diagram, regulation of moisture content

the article presents the ways to implement the concept of using the secondary energy potential suitable for a less energy-intensive system. The positive aspects of the use of waste gas heat for heating the premises, as well as methods of optimization of processes, in order to improve the efficiency of the system and the preservation of temperature and gas conditions that meet the conditions of permanent residence of a person in the service area

Keywords: energy saving, energy resources, wasteful consumption of resources, energy sources, heating, ventilation, efficiency, loss minimization, utilization of flue gases, optimization, engineering solutions

In this article, problems of safety of the exploited structures of the contact network are examined. The types of contact network supports used in the construction of these structures are considered. The features of the centrifuged concrete structure formation, the reasons for the heterogeneity of the structure along the thickness of the annular section and the appearance of cracks are analyzed. There is a physical model, the use of which will allow to modify the structure along the thickness of the annular section due to directed structure formation in the process of concrete with a combined aggregate and fibrous components centrifugal compaction.

Keywords: safety of structures, contact network supports, centrifuged structures, annular cross-section, physical model of the process of compaction of concrete mixture during centrifugation, concrete with combined aggregate and fibrous component

We study the problem of creating a modern efficient Central heating systems and hot water. The analysis of the existing systems is carried out, the choice of the optimal system in the design of the object is proposed

Keywords: water supply and sanitation, Central heating, infrastructure design

The article examines the directions of development of energy saving system in Russia at the present stage, as well as foreign practices. The prospects for development and the main problems in this area are defined. Organizational, economic and legal bases for stimulating energy saving and improving the energy efficiency of buildings are highlighted.

Keywords: energy saving, energy efficiency, resource saving, environment, territorial development, alternative energy sources, energy resources