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  4. Improvement of Energy Efficiency of Air Distribution in a Room Using Swirled Air Jets

Improvement of Energy Efficiency of Air Distribution in a Room Using Swirled Air Jets

JEECS.
2025;
Volume 11, Number 1
: pp. 8 – 13
https://doi.org/10.23939/jeecs2025.01.008
Received: April 21, 2025
Revised: May 18, 2025
Accepted: May 23, 2025

O. Voznyak, V. Bokhan. (2025) Improvement of energy efficiency of air distribution in a room using swirled air jets. Energy Engineering and Control Systems, Vol. 11, No. 1, pp. 8 – 13. https://doi.org/10.23939/jeecs2025.01.008

Authors:
  1. Orest Voznyak
  2. Valentyn Bokhan
1
Lviv Polytechnic National University
2
Lviv Polytechnic National University

This article investigates the aerodynamic behavior and efficiency of swirled air jets used in modern ventilation systems. The influence of rotational motion on turbulence intensity, mixing efficiency, and air distribution uniformity is assessed. Results confirm that swirled jets enhance air mixing and reduce axial velocity and temperature gradients more effectively than traditional non-swirled jets. Key dimensionless parameters, such as velocity and temperature attenuation coefficients, are introduced to simplify calculations. Velocity and temperature profiles across the jet cross-section are examined in detail. The findings demonstrate that swirled jets provide improved control of indoor air distribution, minimize drafts, and help maintain stable thermal comfort. These insights support the implementation of swirl-based air supply solutions in confined and energy-sensitive environments.

air distribution
swirled air jet
air velocity
jet border
air flow turbulence
aerodynamics
  1. P. Kapalo, A. Sedláková, D. Košicanová, O. Voznyak, J. Lojkovics, and P. Siroczki (2014) “Effect of ventilation on indoor environmental quality in buildings,” in The 9th International Conference on Environmental Engineering, Selected Papers, Vilnius, Lithuania, May 22-23, СD 265. eISSN 2029-7092/eISBN 978-609-457-640-9
  2. Voznyak, O., Savchenko, O., Spodyniuk, N., Sukholova, I., Kasynets, M., & Dovbush, O. (2022). Air distribution efficiency improving in the premises by rectangular air streams. Pollack Periodica, 17(3), 111-116. https://doi.org/10.1556/606.2021.00518
  3. Myroniuk, K., Voznyak, O., Savchenko, O., Sukholova, I., Dovbush, O. (2024). Attenuation Coefficients of the Air Distributor with the Interaction of Opposing Non-coaxial Air Jets. In: Blikharskyy, Z., Zhelykh, V. (eds) Proceedings of EcoComfort 2024. EcoComfort 2024. Lecture Notes in Civil Engineering, vol 604. Springer, Cham. https://doi.org/10.1007/978-3-031-67576-8_35
  4. Borowski, M., Zwolińska, K., & Halibart, J. (2023). Air Distribution Assessment-Ventilation Systems with Different Types of Linear Diffusers. https://www.aivc.org/sites/default/files/1_C28.pdf
  5. Voznyak O., Spodyniuk N., Yurkevych Yu., Sukholova I., Dovbush O. (2020) Enhancing efficiency of air distribution by swirled-compact air jets in the mine using the heat utilizators. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, No.5(179), р. 89 – 94 https://doi.org/10.33271/nvngu/2020-5/089
  6. Jaszczur M., Branny M., Karch M., Borowski M. (2016). Experimental analysis of the velocity field of the air flowing through the swirl diffusers. J. Phys.: Conf. Ser. 745:1-9. https://doi.org/10.1088/1742-6596/745/3/032049
  7. Sukholova, I., Voznyak, O., Myroniuk, K. (2011). Indoor air distribution and creation of a dynamic microclimate. Theory and Building Practice. (in Ukrainian). https://ena.lpnu.ua/handle/ntb/19456
  8. Voznyak, O., Myroniuk, K., Spodyniuk, N., Sukholova, I., Dovbush, O., Kasynets, M. (2022). Air distribution in the room by swirl compact air jets at variable mode. Pollack Periodica 17(3), 117–122. https://doi.org/10.1556/606.2022.00515
  9. Voznyak O. (2020) Experiment Planning and Optimization of Solutions in Ventilation Technology. Monograph – Lviv: Lviv Polytechnic National University, 220 p. (in Ukrainian). ISBN: 978-966-553-982-7
  10. Voznyak, O., Sukholova, I., Spodyniuk, N., Kasynets, M., Savchenko, O., Dovbush, O., & Datsko, O. (2023). Enhancing of ventilation efficiency of premise due to linear diffuser. Pollack Periodica, 18(2), 107-112. https://doi.org/10.1556/606.2023.00750
  11. Janbakhsh, S., & Moshfegh B. (2014). Experimental investigation of a ventilation system based on wall confluent jets. Building and Environment, Vol. 80, 18-31. https://doi.org/10.1016/j.buildenv.2014.05.011.
  12. Srebric, J., & Chen, Q. (2002). Simplified Numerical Models for Complex Air Supply Diffusers. HVAC&R Research, 8(3), 277–294. https://doi.org/10.1080/10789669.2002.10391442
  13. Allmaras, S.R., Johnson, F.T., & Spalart, P.R. (2012). Modifications and clarifications for the implementation of the spalart-allmaras turbulence model ICCFD7-1902. 7th International Conference on Computational Fluid Dynamics, Hawaii. http://www.iccfd.org/iccfd7/assets/pdf/papers/ICCFD7-1902_paper.pdf
  14. Dovhaliuk, V. et al. (2018). Simplified analysis of turbulence intensity in curvilinear wall jets. FME Transactions, 46, 177–182. https://doi.org/10.5937/fmet1802177D
  15. Gumen, O. et al. (2017). Geometric analysis of turbulent macrostructure in jets laid on flat surfaces for turbulence intensity calculation. FME Transaction, 45, 236-242. https://doi.org/10.5937/fmet1702236G