: 84-91
Lviv Polytechnic National University
Lviv Polytechnic National University
Lviv Polytechnic National University, Department of Heat and Gas Supply and Ventilation
Lviv Polytechnic National University, Department of Heat and Gas Supply and Ventilation
Lviv Polytechnic National University

The issue of the normative air exchange ensuring in the premises of the boiler houses is extremely important. The article presents the results of theoretical and experimental studies of air velocity determination in the distribution of air by round and compact jets in the boiler room. Graphical and analytical dependences are given. The research results substantiate the higher accuracy of the average air flow velocity determination in small boiler rooms. The aim of the work is to develop a method for experimental determination of the efficiency of the ventilation system in the boiler room; to increase of the accuracy of the average velocity determination of the round and the compact air jets in the plane of the supply nozzle to ensure the normative air exchange of the boiler room and to substantiate of the calculation method. The characteristics and patterns of development of round and compact air jets in the premises are established and the calculated dependences are obtained. The unitless integral air velocity for the round and compact air jets in the boiler room is established. Calculation dependences for determining of the air flow rate in the boiler room have been obtained. It is substantiated that the application of the proposed method will significantly increase the accuracy of air exchange determination in the boiler rooms to ensure the required value in accordance with regulatory requirements. Also it is substantiated that to obtain satisfactory experimental results on speed measurements in the boiler room, it is necessary to measure the speed in the center of the supply nozzle several times with maximum accuracy. Then multiply the result by the relative average velocity: for a round jet vav = 0,26 and for a compact jet – vav = 0,2025. The obtained results allow to avoid a significant error (19 %) in determining the required air exchange ventilation of the boiler room. Recommendations for the practical determination of the calculated values to ensure proper ventilation of the boiler rooms are given.

Kapalo, P., Domnita, F., Bacotiu, C., & Spodyniuk, N. (2018). The impact of carbon dioxide concentration on the human health - case study, Journal of Applied Engineering Sciences. Vol. 8, no. 1, 2018, p. 61-66, ISSN 2284-7197,

Kapalo, P., Meciarova, L., Vilcekova, S., Burdova, E., Domnita, F., Bacotiu, & C. Peterfi, K. (2019). Investigation of CO2 production depending on physical activity of students. International Journal of Environmental  Health Research. Vol. 29, Issue 1, 31-44. ISSN:09603123.

Kapalo, P., Sedláková, A., Košicanová, D., Voznyak, O., Lojkovics, J., & Siroczki, P. (2014). Effect of ventilation on indoor environmental quality in buildings. The 9th International Conference "Environmental
Engineering", 22-23 May 2014, Vilnius, Lithuania SELECTED PAPERS, eISSN 2029-7092 / eISBN 978-609-457-640-9 Section: Energy for Buildings.

Kapalo, P., Voznyak, O., Yurkevych, Yu., Myroniuk, Kh., & Sukholova, I. (2018). Ensuring comfort microclimate in the classrooms under condition of the required air exchange. Eastern European Journal of
Enterprise Technologies, Vol 5/10 (95), 6-14.

Kapalo, P., Vilcekova, S., & Voznyak, O. (2014).Using experimental measurements the concentrations of carbon dioxide for determining the intensity of ventilation in the rooms. Chemical Engineering Transactions, Vol. 39, 1789-1794.ISBN 978-88-95608-30-3; ISSN 2283-9216.

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 - Case Study, The 10th International Conference on Environmental Engineering, Vilnius, Lithuania, Selected Papers, 30-35.

Redko, A., Dzhyoiev, R., Davidenko, A., Pavlovskaya, A., Pavlovskiy, S., Redko, I., Kulikova, N., Redko,O. (2019). Aerodynamic processes and heat exchange in the furnace of a steam boiler with a secondary emitter. Alexandria Engineering Journal. Volume 58, Issue 1, 89-101.

Redko, A., Kulikova, N., Pavlovskiiy, S., Redko, A. (2018). Simulation and optimization of heat-exchanger parameters of heat pipes by changes of entropy. Heat Transfer Research. Volume 49, Issue 16, 1545-1557.

Voznyak, O., Korbut, V., Davydenko, B., & Sukholova, I. (2019). Air distribution efficiency in a room by a two-flow device. Proceedings of CEE, Advances in Resourse-saving Technologies and Materials in Civil and Environmental Engineering, Springer, Vol 47, 526-533.

Voznyak, O., Myroniuk, K., & Dovbush, O. (2005). Relationship between a Person Heat Exchange and Indoor Climate. Selected scientific Papers 10th Rzeszow-Lviv-Kosice Conference 2005 Supplementary
Issue.Technical University of Kosice. 148-152.

Gumen, O.M., Dovhaliuk, V.B., & Міleikovskyi, V.O. (2016). Determination of the intensity of turbulence of streams with large-scale vortices on the basis of geometric and kinematic analysis of macrostructure. Proc. of Lviv Polytechnic National University: The theory and building practice, No.844, 76-83 (in Ukrainian).

Dovhaliuk, V.B., & Міleikovskyi, V.O. (2007). Efficiency of organization of air exchange in heat-stressed premises in compressed conditions. Journal: Building of Ukraine, No.3, 36. (in Ukrainian).

Dovhaliuk, V.B., & Міleikovskyi, V.O. (2008). Estimated model of non-isothermal stream, which is laid out on a convex cylindrical surface. Ventilation, Illumination and Heat and Gas Supply: Scientific and Technical Collection, Issue 12, Kyiv, KNUBA, 11-32 (in Ukrainian).

Dovhaliuk V.B., & Міleikovskyi, V.O. (2013). Analytical studies of the macrostructure of jet currents for calculating energy-efficient systems of air distribution. Energy efficiency in construction and architecture, Issue 4, 11-32 (in Ukrainian).

Boiler rooms. DBN В.2.5-77:2014. State Building Codes of Ukraine. (2014). Kyiv: Ukrarkhbudinform (in Ukrainian).