Vibrations in engineering and technology

Yaropud Vitalii - Doctor of Technical Sciences, Associate Professor of the Department of machinery and equipment for agricultural production of Vinnytsia National Agrarian University (St. Soniachna, 3, Vinnytsia, Ukraine, 21008, e-mail: yaropud77@gmail.com).

The article presents the results of theoretical and experimental studies of an adaptive triple-pipe heat recovery unit designed to ensure energy-efficient microclimate control in livestock buildings. The relevance of implementing recuperative systems in ventilation complexes operating under conditions of high humidity, dust concentration, and aggressive gaseous environments is substantiated, as traditional heat recovery units often demonstrate low efficiency and limited durability in such settings. The proposed design incorporates three coaxial channels with counter-flow air interaction, adaptive servo-driven dampers, a system of temperature, airflow velocity, and air-quality sensors, as well as an automated control unit that provides dynamic stabilization of operational parameters.

A comprehensive evaluation of the thermodynamic and aerodynamic characteristics of the experimental prototype was conducted on a specialized laboratory test bench. The study employed the methodology of a full three-factor experiment (PFE 3³), which enabled the determination of the influence of heat exchanger length, volumetric airflow rate, and outdoor air temperature on the useful thermal output. Based on the experimental data, a regression model was developed, its adequacy statistically confirmed, and significant factors and their interactions identified. It was established that the system exhibits an optimal operating mode at an airflow rate of approximately V ≈ 0.39 m³/s, achieving a maximum thermal output of 4386 W at a length of L = 8 m and an outdoor air temperature of 0 °C.

The results confirm the high efficiency of the adaptive triple-pipe configuration and its advantages over conventional recuperators, particularly in terms of uniform heating of supply air, reduced fan energy consumption, and reliable performance under challenging operational conditions. The findings create a foundation for the industrial implementation of the proposed heat recovery unit and further optimization of its structural parameters.

1. Kaletnik, H. M. (2008). Energy supply of Ukraine and possibilities of using renewable energy sources. Visnyk of Agrarian Science, 10, 50–55. [in Ukrainian].

2. Kolechko, A., & Pikula, O. (2025). Optimization of microclimate in livestock buildings as a key factor in preventing diseases in calves. Modern Engineering and Innovative Technologies, 39(4), 107–122. https://doi.org/10.30890/2567-5273.2025-39-04-014. [in English].

3. Pryshliak, V. M., & Yaropud, V. M. (2014). Analysis and classification of technological schemes of heat recovery units for livestock buildings. Visnyk of Zhytomyr National Agroecological University, 2(45), 4(II), 344–350. [in Ukrainian].

4. DBN V.2.5-67:2013. (2013). Heating, ventilation and air conditioning. Kyiv: Ministry of Regional Development of Ukraine. [in Ukrainian].

5. Pryshliak, V. M., & Yaropud, V. M. (2014). Substantiation of design parameters of recuperative heat recovery units for livestock buildings. Collection of Scientific Works of Vinnytsia National Agrarian University. Series: Technical Sciences, 2(85), 102–112. [in Ukrainian].

6. Vakulenko, D., & Mileikovskyi, V. (2022). Modeling the efficiency of heat recovery of a regenerative device using various approaches. Ventilation, Lighting and Heat and Gas Supply, 41, 32–38. https://doi.org/10.32347/2409-2606.2022.41.32-38. [in Ukrainian].

7. Reventa GmbH. (2025). Product catalogue. Retrieved October 2, 2025, from http://www.reventa.de/ru/company/efficiency. [in Ukrainian].

8. AgroVent. (2025). Official website. Retrieved October 2, 2025, from https://agrovent.com.ua

9. Povod, M. (2021). Technology of production and processing of pig farming products. Kyiv: Scientific and Methodological Center of Vocational Higher Education. [in Ukrainian].

10. Horobets, V. H., & Trokhaniak, V. I. (2017). Energy-efficient microclimate maintenance system in poultry buildings. Kyiv: Comprint. [in Ukrainian].

11. Kaletnik, H. M., & Yaropud, V. M. (2022). Simulation of the heat and mass transfer process of an indirect evaporative heat exchanger. Machinery, Energy, Transport of Agro-Industrial Complex, 1(116), 4–15. https://doi.org/10.37128/2520-6168-2022-1-1. [in English].

12. Kaletnik, H. M., & Yaropud, V. M. (2023). Experimental studies of the efficiency of negative-pressure microclimate systems in livestock buildings. Design, Production and Operation of Agricultural Machines, 53, 66–84. https://doi.org/10.32515/2414-3820.2023.53.66-84. [in Ukrainian].

13. Herasymchuk, V. M. (2018). Assessment and improvement of ventilation systems for pig buildings of various purposes (PhD dissertation). [in Ukrainian].

14. Hulai, B. I., Shapoval, S. P., Klymenko, H. M., Sukholova, I. Ye., & Kasynets, M. Ye. (2020). Energy-efficient ventilation systems. Lviv: Halych-Pres. [in Ukrainian].

15. Pryshliak, V. M., Yaropud, V. M., Koviazin, O. S., & Aliiev, E. B. (2014). Substantiation of geometric parameters of hole placement in the air duct of a three-pipe concentric heat recovery unit. Industrial Hydraulics and Pneumatics, 4(46), 83–87. [in Ukrainian].

16. Pryshliak, V. M., & Yaropud, V. M. (2015). Optimization of technological parameters of heat and mass transfer processes in concentric-type heat exchangers. Machinery, Energy, Transport of Agro-Industrial Complex, 1(91), 85–90. [in Ukrainian].

17. Aliiev, E. B., & Yaropud, V. M. (2015). Comparative analysis of theoretical and experimental studies of the operation process of a heat recovery unit for livestock buildings. Design, Production and Operation of Agricultural Machines, 45(II), 120–124. [in Ukrainian].

18. Yaropud, V. M. (2020). Study of operation processes and optimization of design and technological parameters of a three-pipe recuperator. Machinery, Energy, Transport of Agro-Industrial Complex, 1(108), 23–32. https://doi.org/10.37128/2520-6168-2020-1-16. [in English].

19. Honcharuk, I. V., Yaropud, V. M., Aliiev, E. B., & Kupchuk, I. M. (2021). Adaptive three-pipe heat recovery unit (Ukrainian utility model patent № 148273). Kyiv: Ukrainian Intellectual Property Institute. [in Ukrainian].

20. Drahanov, B. Kh. (2005). Heat engineering (2nd ed.). Kyiv: INKOS. [in Ukrainian].

21. Horbatenko, I. Yu. (2001). Fundamentals of scientific research. Kyiv: Vyshcha Shkola. [in Ukrainian].

22. Nechaiev, V. P. (2009). Theory of experimental design. Kyiv: Kondor. [in Ukrainian].