The paper proposes and considers a possibility to improve an operational reliability of reversing magnetic starters by reservation of main and auxiliary contacts in accordance with majority-logic voter «two out of three».

The paper presents a method for complex estimation of balance reliability for a deficit power system. An integral estimation is based on a vector function of the total power shortfall. Its components are presented in the form of active power node capacities of different types and include generating, load nodes, and also nodes which are bound to intersystem transmission lines, including reversing ones.

The task takes into account values of available reserve capacities and values of taken-out repair capacities including nodes used for binding to power-intensive industrial enterprises which carry out a consumer-regulator role.

The search is carried out in the definition domain pertaining to multi-criteria complicated function which is created by a complex of regime, technical and cost limiting conditions. Conditions and stages of parameter correction for a scheduled  mode have been formulated in the paper.

The paper draws attention to specific features of the modes pertaining to operation of outdoor lighting lines. An outdoor lighting line is sensitive to voltage fluctuations. The voltage value has a significant effect on the electricity consumption indices and operational characteristics of various lamps. Efficiency and operational conditions of outdoor lighting luminaires are determined by an operational  mode of  a network. Calculation of electrical parameters pertaining to outdoor lighting power network has some specific features.

The paper describes experimental investigations of thermal and physical characteristics pertaining to material specimens which has been used for manufacturing the proposed heating device for heat supply system of a field medical hospital. The type of the given material has been determined that is  polyvinyl chloride.

A warm-up period required for the heating device and estimation of time required for installation of a heating system for successful operation of the field hospital have been determined and executed in the paper.

The paper presents designs of bimetallic ridge pipes (BRP) with spirally-wound aluminium KLM-edges for heat exchange air coolers. Heat exchange BRP differ from the applied ones in heat-transfer coefficient which is higher by 10–15 %, extended temperature of applicability up to 320 °С for a cooled heat carrier at the pipe input, higher thermal reliability at alternating thermal burdens, current consumption for their manufacturing which is less by 1.8–2.5-fold, aluminium consumption which is less up to 1.8-fold, manufacturability in batch production,  availability high-production equipment.

Theoretical properties of a method for construction of analytical solutions pertaining to heat conduction boundary value problem for multilayer structures have been given on the basis of the Kantarovich orthogonal method.

Methodology for construction of coordinate function systems has been developed that satisfy  boundary conditions in  any approximation and satisfy matching conditions at any number of contacting bodies. 

Analytical solution of the heat conduction problem has been obtained on the basis of temperature perturbation front introduction  and additional boundary conditions with regard to the last layer of the multilayer system. The solution makes it possible to evaluate temperature state of a structure for small and very small time values.

A modern method for determination of fuel efficiency which is used in high-temperature plants (industrial furnaces) has been considered in the paper. The paper estimates a heat recovery role of flue gases at the furnace outlet with the purpose to save  natural gas and replace it with alternative gas fuel. Efficient heat-utilizing installations for high-temperature plants have been presented in the paper, examples of heat recovery unit application in various technological schemes including processes of biomass gasification.

The paper proposes to apply a combined measuring controller in order to solve a problem pertaining to redundancy of information transmitted from technical means which have passed  lifetime extension procedure at Atomic Power Stations (APS). The controller operates on the basis of digital and probabilistic forms of  information presentation that allows to obtain the best possible fit and combination of  accuracy, fast operation and hardware capacity.

An absolute internal efficiency coefficient of the Stirling engine has been obtained without regenerator and with regenerator under conditions when van der Waals gas serves as a working medium. The paper reveals that while taking into account own volume of molecules thermal efficiency coefficient of the Stirling engine depends on mole number of the working medium  and it is slightly increasing  in comparison with the case of an ideal gas. The paper gives consideration to heat losses while the Stirling machine operates with heat regeneration. Dependence of regeneration rate on time of heat transfer has been obtained in the paper.

The paper presents an application experience of composite materials with macro-hetero-geneous structure for normalization of thermo-mechanical state of steam turbines. It has been shown that the developed repairing technology with application of composite materials with macro-heterogeneous structure makes it possible to ensure thermo-mechanical state of steam turbines after their reconstruction  at the level of newly assembled ones.