Vibrations in engineering and technology

Yaropud Vitalii, Doctor of Technical Sciences, Associate Professor, Dean of the Faculty of Engineering and Technology, Vinnytsia National Agrarian University (3 Soniachna St., Vinnytsia, 21008, Ukraine yaropud77@gmail.com  https://orcid.org/0000-0003-0502-1356).

Shtuts Andrii - Ph.D., Senior Lecturer., Department of Electric Power Engineering, Electrical Engineering and Electromechanics, Vinnitsa National Agrarian University (3, Solnechna str., Vinnitsa, 21008, Ukraine, email: shtuts1989@gmail.com, https://orcid.org/0000-0002-4242-2100). 

Kolisnyk Mykola - Doctor of Philosophy in Materials Science, Senior Lecturer Department of Electric Power Engineering, Electrical Engineering and Electromechanics, Vinnitsa National Agrarian University (3, Solnechna str., Vinnitsa, 21008, Ukraine, email: kolisnik30@gmail.com, https://orcid.org/0000-0001-5502-6556). 

Lypnytskyi Roman - Assistant of the Department of Agroengineering and Technical Service, Vinnytsia National Agrarian University (3 Sonyachna St., Vinnytsia, 21008, Ukraine. lroma5105@gmail.com, https://orcid.org/0009-0001-3711-5632).

The article provides a comprehensive analytical review of indirect evaporative coolers (IEC) as a promising element for improving the energy efficiency of cogeneration systems based on renewable energy sources. The relevance of the study is обусловлена the need for the rational use of low-potential heat flows characteristic of biogas, biomass, and hybrid power plants, as well as the reduction of specific energy consumption for cooling under conditions of a growing share of renewable energy in the energy balance.

The prerequisites and main directions for the application of indirect evaporative coolers for cooling the air supplied to internal combustion engines operating on biogas, gas turbine and microturbine units, as well as for the utilization of low-potential waste heat, are considered. The physical principles of IEC operation are analyzed, which are based on indirect heat and mass transfer using the latent heat of water evaporation, ensuring intensified heat transfer under conditions of limited temperature differences.

The paper systematizes the main design solutions of indirect evaporative coolers, including plate-type, channel-type, and tubular configurations, as well as modern methods for intensifying heat and mass transfer through the use of capillary-porous materials, finned surfaces, and polymer and composite heat-exchange elements. A comparative assessment of industrial solutions offered by leading global manufacturers is presented according to the criteria of thermal efficiency, operational reliability, and economic feasibility of implementation.

It is shown that the greatest effect from the use of indirect evaporative coolers is achieved in biogas-based cogeneration systems through the cooling of intake air, which contributes to increasing electrical efficiency, stabilizing thermal operating conditions, and reducing internal energy consumption. Practical recommendations are formulated for selecting the IEC type for agro-industrial enterprises, taking into account climatic operating conditions, water quality, equipment service life requirements, and capital cost limitations.

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