An algorithmized approach to execution of expeditious calculations of technical electric power losses in networks of 35 kV and higher in the Integrated Power System (IPS) of Belarus has been developed on the basis of performance information accumulated by modern intellectual recording and data storage devices. The paper shows that in order to carry out expeditious calculations it is necessary to simulate daily load curves in the non-observable part of the network on the basis of factorial statistical analysis.

Parametric methods have been recommended on the basis of current and voltage value recording in normal and emergency modes at a sub-transmission substation in order to detect two- and three-phase short circuits in overhead power distribution networks. The paper proposes to detect an inspection zone in order to locate an interphase fault with the help of analytical calculation of distance up to the fault point using 3–4 expressions on the basis of data obtained as a result of multiple metering pertaining to emergency mode parameters  with their subsequent statistical processing.

The paper considers some aspects pertaining to an application of technologies for energy storage in electric power. Review of technical and cost characteristics of energy storage units has been given in the paper. The review reflects data of the energy storage units which are available and which are under development. The paper proposes an approach that permits to assess boundaries of economically reasonable application of energy storage systems in order to balance daily load curve of a power system.

The paper presents a step-by-step optimization method for transformer replacement of the 6–10 kV power distribution networks on the basis of sensitivity theory. The influence of load parameters on the efficiency of transformer replacement in distribution networks has been evaluated in the paper. The paper reveals that the first step of optimization is the most effective one and it is particularly important in the case of the limited financial resources.

The possibility to utilize existing secondary energy resources for heat supply of an industrial enterprise has been proposed on the basis of the analysis on operation of compressor stations of a cross-country gas pipe-line. The paper considers an influence of waste heat recovery section on operational efficiency of gas turbine drive with regenerative heat utilization.

The paper analyzes various factors that affect upon heat transfer in high temperature recuperators, namely: heat transfer enhancement, heat exchange surface increase and rise of temperature head between primary and secondary heat transfer fluids. Comparison of experimental data with the results of mathematical and computational fluid dynamics (CFD) modeling has been performed in the paper. The paper considers some new designs of high temperature heat recovery plants: tube recuperator equipped with internal inserts – secondary emitters inside tubes for metallurgical furnaces and high-efficient two-way radiative recuperators for machinery engineering furnaces.  Advantages of new recuperators in comparison with existing analogues have been estimated in the paper. These advantages are:  provision of additional fuel saving due to increase of preheating temperature of the combustion air and improvement of design stability by decrease of tube wall temperature.

The paper presents extensive knowledge and practical experience on burning of milled peat in the boilers of thermal electric power plants in Belarus and Russia. The accumulated experience can be used for solution of problems pertaining to substitution of some types of fuel imported to Belarus by milled peat which is extracted at many fuel effective peat enterprises of the Republic.

The paper presents experimental data on thermal conductivity of BeCl₂ and SrCl₂ salt aqueous solutions in the temperature range from 20 to 300 °С  and at various electrolyte concentrations  in mass percent. For the first time thermal conductivity of the system Н₂О + BeCl₂ has been investigated at high temperatures.

The experimental results are described with the help of an empirical equation in the form of: 

λ_s = λ_o (1+ Am + Bm^3/2 + Cm²),

where λ_s  and λ_o – thermal conductivity coefficients of solution and water; A, B and C – coefficients depending on electrolyte nature; m – molality in units mol/kg.

The formula error is less than  ±1 %.

The paper proposes theoretical and experimental methods for investigation of strain-stress state of wood and lumber saw-timbers in the process of heated-air drying.

Contains exact and approximate analytic representations pertaining to the solution of a homogeneous mixed problem for a non-homogeneous one-dimensional equation of heat conduction using a special psi-function. The order of an approximate formula accuracy is given in the paper.

The paper considers a heat calculation method of borehole heat exchangers (BHE) which can be used for designing and optimization of their design values and included in a comprehensive mathematical model of heat supply system with a heat pump based on utilization of low-grade heat from the ground.

The developed method of calculation is based on the reduction of the problem general solution pertaining to heat transfer in BHE with due account of heat transfer between top-down and bottom-up flows of heat carrier to the solution for a boundary condition of one kind on the borehole wall. Used the a method of electrothermal analogy has been used for a calculation of the thermal resistance and  the required shape factors for calculation of  a borehole filler thermal resistance have been obtained numerically. The paper presents results of heat calculation of various BHE designs in accordance with the proposed method.