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1
Matematyczne modelowanie rozprowadzania powietrza za pomocą nawiewników liniowych
100%
Voznyak O. , Sukholova I. , Kasynets M.
Rynek Instalacyjny
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2022
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tom Nr 12
80--81
PL
Artykuł poświęcony jest możliwościom zwiększenia efektywności rozprowadzania powietrza poprzez zastosowanie nawiewników liniowych, w celu zapewnienia normatywnych parametrów klimatu wewnętrznego. Wykazano, że dla uzyskania maksymalnej wydajności rozprowadzania powietrza konieczne jest zapewnienie nawiewu strumieni powietrza, które mają normatywną prędkość i temperaturę przed wejściem do obsługiwanego obszaru. Udoskonalono matematyczny model nawiewu za pomocą nawiewników liniowych. Symulację przepływu powietrza przeprowadzono za pomocą oprogramowania CFD FLUENT (Ansys FLUENT) z wykorzystaniem modelu turbulencji k-ɛ. Wykazano, że stosując nawiewniki liniowe do nawiewu powietrza do pomieszczenia, można osiągnąć główne zadanie - stworzyć komfortowe warunki o normatywnych parametrach.
EN
The article is devoted to solve the actual task of increasing the efficiency of air distribution by using linear diffusers to ensure the normative parameters of indoor climate. It is shown that in order to achieve maximum efficiency of air distribution it is necessary to provide air supply with air jets, which have normative velocity and temperature before entering the serviced area. The mathematical model of air supply with linear diffusers is improved. Airflow simulation was performed using CFD FLUENT (Ansys FLUENT) software using the k-ɛ turbulence model. It’s shown that using linear diffusers for supplying air into the room we can gain the main task - to create comfortable conditions with normative parameters.
2
Content available Analysis of the influence of the heat-absorbing surface of an air-cooled solar collector on its thermal and mechanical properties
88%
Zhelykh V. , Ulewicz M. , Kozak K. , Savchenko O. , Kasynets M.
System Safety : Human - Technical Facility - Environment
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2019
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tom Vol. 1, nr 1
481--489
EN
This paper presents the analysis of existing forms of heat absorbing surfaces of air solar collectors, which gained the greatest popularity in the world. The obtained data allowed to conclude that there is a need for the development of solar collectors with air as a coolant with an improved form of heat absorber, which will reduce the operational and capital costs of solar systems and allow the efficient use of such structures in a moderate climate without additional mechanisms for the transfer of coolant. The use of computer simulation helped to compare the thermal characteristics of air-borne solar collectors of a different design. The substantiation of the expediency of installing as a heat absorber of flow turbulators in the form of a screw has been fulfilled, as well as the height of the air channel of the solar collector has been determined, in which the maximum heating of the transfer medium is observed. In addition, the loss of pressure in the air channel of the solar collector with flow turbulators was determined and the comparison of the obtained data with the values of pressure losses in the air collector of the matrix type and the air collector with V-shaped ribs was made.
3
Content available Diagnosis of damage to the ventilation system
75%
Voznyak O. , Spodyniuk N. , Sukholova I. , Dovbush O. , Kasynets M. , Datsko O.
Diagnostyka
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2021
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tom Vol. 22, No. 3
91--99
EN
The article is devoted to solving of urgent problem to eliminate damages of two types in ventilation systems for air distribution efficiency increasing in the premises by swirled air flow, compact air jet, flat air stream and rectangular air jet. A mathematical model of air supply with swirled air flow, compact air jet, flat air jet and rectangular air stream in the room has been developed. It is shown that in order to achieve the maximum efficiency of air distribution it is necessary to ensure its supply by jets. Graphical and analytical dependences on the basis of the conducted experimental research are presented. Parameters of swirled air flow, compact air jet, flat air stream and rectangular air jet during the formation of a comfortable indoor climate are determined. The results of experimental studies of air supply to the room by the air distribution devices, which form a swirled air flow, compact air stream, flat air flow and rectangular air jet with adequate turbulence and long range of the supply air flow, are presented. It is established that with the increase of the angle of swirling plates inclination and ratio of the slit sides the air jets long range increases.
4
Content available Analysis of air jets velocity attenuation at special initial conditions
75%
Voznyak O. , Spodyniuk N. , Savchenko O. , Dovbush O. , Kasynets M. , Datsko O.
Diagnostyka
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2022
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tom Vol. 23, No. 3
art. no 2022308
EN
The article is devoted to solving the significant problem of efficiency increasing of air distribution in the premise by swirl air jet. The aim of the article is to decrease coefficient of velocity attenuation due to intensification of initial turbulence of different air streams leakage from the air distributor and to obtain of analytical equations for calculation of air distribution in a room to ensure the normative indoor air parameters. Effect of flow twisting results in a reduction of the velocity attenuation coefficient by 2.4 times. The regression analysis testified that the attenuation coefficient of the swirl air jet is more affected by the angle of the twisting plates inclination and less affected by the angle of change of the air flow direction. The attenuation coefficient of all types of rectangular air jets is more influenced by the the ratio of the sides of slit b/l and the angle of change of the air flow direction is also less affected. To minimize the attenuation factor, it is effective to use air distributors at smaller swivel plates inclination angles for swirl air jets and a smaller slit size ratio for all types of rectangular air jets.
5
Content available Analysis of premise infrared heating and ventilation with an exhaust outlet and flat decking air flow
75%
Voznyak O. , Spodyniuk N. , Savchenko O. , Dovbush O. , Kasynets M. , Datsko O.
Diagnostyka
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2022
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tom Vol. 23, No. 2
art. no. 2022207
EN
The article is devoted to solving of urgent problem to analyse energy saving effect from radiant heating and ventilation of premise with exhaust outlet and flat decking air jet. The aim of the work is analysis of energy efficiency of radiant heating systems using infrared heaters and ventilation of the premise due to the effect of a flat decking air jet on the surface of the heater; determination the amount of heat received both by flat decking air jet from the infrared heater when laying on its flat surface and amount of heat from the exhaust air entering the recuperator. Use of the infrared heaters in combination with an air distribution of the ventilation system with the flat decking air jets is effective, as it allows to achieve savings in heat load of the ventilation system in the range of 11%-19%. The amount of heat recovery of the exhaust air removed by the exhaust outlet is 30-40 W that equals 15%-20%. Saving the heat load of the ventilation system allows reducing the actual initial temperature of the tidal flat decking air jet and achieving a total saving of thermal energy of 24%-34%.
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