Engineering, Energy, Transport AIC

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

The article is devoted to investigating the influence of the structural parameters of an indirect evaporative heat exchanger on the efficiency of air cooling in microclimate control systems for livestock buildings. The relevance of the study is driven by increasing thermal loads during the summer period, higher requirements for maintaining comfortable conditions for animals, and the need to reduce energy consumption associated with air conditioning and ventilation processes in the agro-industrial sector.
The feasibility of using indirect evaporative cooling systems as an energy-efficient alternative to conventional compressor-based refrigeration units is substantiated. Such systems allow a reduction in the temperature of supply air without increasing its moisture content. A laboratory-scale experimental prototype of an indirect evaporative heat exchanger with a cross-flow air movement configuration was designed and manufactured. Experimental investigations were carried out by varying the inlet air temperature, absolute humidity, and airflow rate, as well as for two structural configurations of the heat and mass exchanger, featuring identical and different interchannel opening areas.
Based on statistical processing of the experimental data, second-order regression equations were obtained for the outlet temperature of the primary air stream, the thermal efficiency coefficient, and the effective cooling capacity of the heat exchanger. The adequacy of the developed mathematical models was confirmed using the Cochran and Fisher criteria, as well as by high correlation coefficients between experimental and calculated results. 
It was established that the use of different interchannel opening areas intensifies heat and mass transfer processes, reduces the outlet air temperature, and increases thermal efficiency and effective cooling capacity compared to the configuration with identical opening areas. Rational operating modes of the heat exchanger were determined in terms of minimizing outlet air temperature and maximizing energy efficiency. The obtained results can be applied in the design and optimization of microclimate systems for livestock buildings and in the development of automatic control algorithms for air cooling processes.

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