The report proposes a variant of the use of heat exchangers with thermosyphons at thermal power plants and in boiler houses. One of the possible areas of application of heat exchangers with thermosyphons is their use as oil coolers in a gas turbine unit. At thermal power plants, in addition to thermal pollution, pollution of water, soil, and the air basin with oil and oil products
is a serious problem. In this regard, the development and research of devices for cooling oil in turbine plants is required. Such devices should provide high thermal performance and exclude pollution of the water basin with oil and oil products, as well as the ingress of water into oil. The presence of water in the oil will drastically deteriorate its characteristics and thereby create the danger of emergencies. Therefore, according to safety regulations, the oil pressure in the system must exceed the pressure of the cooling water.

Currently, thermosyphons are rarely used in industry. This phenomenon can be explained by the fact that the physics of the processes occurring in thermosyphons (jointly occurring processes of heat conduction, convection and phase transitions
in the zones of evaporation and condensation) has not yet been sufficiently studied. In addition, the accumulated knowledge in this area is, as a rule, the conclusions obtained for specific versions of thermosyphons and coolants, design schemes and
technical solutions. Analysis of the most significant results of studies of heat transfer in closed two-phase thermosyphons shows that the most significant characteristic of their work is thermal resistance.The established experimental data will further allow the development of efficient heat exchangers with two-phase heat transfer elements for their use in power engineering, refrigeration engineering, ventilation and air conditioning systems, and industry, in order to reduce energy consumption, material consumption, and improve the quality of products.

The paper considers ways to increase the antifriction properties of ceramic coatings obtained on aluminum alloys by the method of micro-arc oxidation (MAO). Two methods of reducing the rhenium coefficient of ceramic coatings have been proposed by impregnation in compositions based on mineral oils, as well as by carrying out MAO in electrolytes containing particles of dry lubricants. It has been established that impregnation with mineral oil makes it possible to reduce the friction coefficient of ceramic coatings by more than 5 times and, as a consequence, to reduce the temperature in the friction zone. Pre-treatment of the coating with surfactants further improves this performance. As a second method for increasing the anti-friction properties of ceramic coatings, the possibility of introducing solid lubricant particles-zinc oxide, colloidal graphite and molybdenum disulfide- into the coating material from electrolyte during MAO was investigated. It was found that the introduction of solid lubricant particles into the base electrolyte leads to a significant decrease in the friction coefficient, which can be explained by the direct
introduction of lubricant particles into the coating material. The studies carried out open up possibilities for further improving the antifriction properties of ceramic coatings and expanding the areas of application of aluminum alloys in friction units.

The work is devoted to the problem of increasing the interfacial interaction
of the components of polymer mixtures based on polyolefins by introducing nanodispersed silicon dioxide. This is due to the fact that a characteristic feature of most polymer mixtures is their thermodynamic incompatibility and an increase in interfacial interaction at the interface between the mixture components is the main condition for obtaining composite materials with improved properties. Nanodispersed silicon dioxide was obtained by dispersing Kove-los silicon dioxide in a mixture of toluene with isopropyl alcohol, and then the resulting organosol was mixed with polymer particles. Primary and secondary polyolefins - low and high pressure polyethylene -  were used as polymers. Samples were made by extrusion. Studies have shown that the introduction of nanodispersed silicon dioxide into a mixture of secondary polyolefins increases their mechanical strength by 71%, and the introduction of the same dioxide into a mixture of primary polymers increases the strength by only 52%. This is explained by the appearance in secondary polyolefins due to oxidative and mechanical destruction processes during their processing of
hydroxyl, peroxide, carbonyl and ether groups that provide interaction between oxidized fragments of polymer macromolecules and particles of silicon dioxide.