The study focuses on the construction and application of nomograms for describing the formation of swirling air jets, widely used in ventilation systems. These jets have a complex three-dimensional structure with axial, radial, and tangential velocity components, which enhance mixing, reduce gradients, and improve air distribution efficiency. To adequately represent these processes, the paper proposes a methodology for building nomograms based on analytical expressions of axial velocity and excess temperature in non-isothermal jets. For simplification, velocity decay (m) and temperature decay (n) coefficients are introduced as reference characteristics of air-distribution devices, defined theoretically or experimentally. The resulting dependencies, presented in a nomogram, allow quick data interpolation, facilitate analysis of geometric and operational factors, and support optimization of ventilation and air-conditioning systems.
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https://doi.org/10.5937/fmet1802177D
Dovhaliuk, V., & Mileikovskyi, V. (2018). New approach for refined efficiency estimation of air exchange organization. International Journal of Engineering and Technology (UAE), 7(3.2), 591-596. https://doi.org/10.14419/ijet.v7i3.2.14596
https://doi.org/10.14419/ijet.v7i3.2.14596
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https://doi.org/10.1016/j.cma.2006.10.009
Kapalo, P., Vilceková, S., Domnita, F., Bacotiu, C., & Voznyak, O. (2017). Determining the ventilation rate inside an apartment house on the basis of measured carbon dioxide concentrations. The 10th International Conference "Environmental Engineering", Vilnius, Lithuania, 30-35. https://doi.org/10.3846/enviro.2017.262
https://doi.org/10.3846/enviro.2017.262
Kapalo, P., Vilcekova, S., & Voznyak, O. (2014). Using experimental measurements of the concentrations of carbon dioxide for determining the intensity of ventilation in the rooms. Chemical Engineering Transactions, 39, 1789-1794. https://doi.org/10.3303/CET1439299
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https://doi.org/10.1016/j.buildenv.2018.03.038
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https://doi.org/10.1016/S0360-1323(02)00182-8
Gumen, O., Dovhaliuk, V., & Mileikovskyi, V. (2019). Geometric representation of turbulent macrostructure in 3D jets. In Proceedings of the 18th International Conference on Geometry and Graphics (ICGG 2018) (pp. 739-745). Springer. https://doi.org/10.1007/978-3-319-95588-9_61
https://doi.org/10.1007/978-3-319-95588-9_61
Gumen, O., Dovhaliuk, V., Mileikovskyi, V., Lebedieva, O., & Dziubenko, V. (2017). Geometric analysis of turbulent macrostructure in jets laid on flat surfaces for turbulence intensity calculation. FME Transactions, 45, 236-242. https://doi.org/10.5937/fmet1702236G
https://doi.org/10.5937/fmet1702236G
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https://doi.org/10.1016/j.buildenv.2014.05.011
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https://doi.org/10.2514/1.39947
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
https://doi.org/10.1080/10789669.2002.10391442
Voznyak, O., Korbut, V., Davydenko, B., & Sukholova, I. (2019). Air distribution efficiency in a room by a two-flow device. In Proceedings of CEE 2019: Advances in Resource-saving Technologies and Materials in Civil and Environmental Engineering (Vol. 47, pp. 526-533). Springer. https://doi.org/10.1007/978-3-030-27011-7_67
https://doi.org/10.1007/978-3-030-27011-7_67