Geometric analysis of turbulent macrostructure in jets laid on flat surfaces for turbulence intensity calculation

Gumen, Olena; Dovhaliuk, Volodymyr; Mileikovskyi, Viktor; Lebedieva, O.; Dziubenko, V.

doi:10.5937/fmet1702236g

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…It is possible to assume that the jet consumes the turbulent vorticity in injection flow to the jet. It can be assumed [17] as near to 0.055 (5.5 %), and it is possible to add it to the results and obtain the ideal difference -up to 0.025. For the concave jets (by experimental data of Tailand & Mathieu, Wilson & Goldstein and Spettel at al.)…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

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Simplified analysis of turbulence intensity in curvilinear wall jets

Dovhaliuk¹,

Gumen²,

V.³

et al. 2018

FME Transaction

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Section: Analysis Of the Resultsmentioning

confidence: 99%

“…By the equations (3,14,16,17) after simple transformations, the relative ordinate of the touch point…”

Section: Geometric Analysis Of the Simplified Macrostructure Chartmentioning

confidence: 99%

Simplified analysis of turbulence intensity in curvilinear wall jets

Dovhaliuk¹,

Gumen²,

V.³

et al. 2018

FME Transaction

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“…E z can be calculated using standard jet calculation procedure minimizing unnecessary air losses during jet development. It is possible to use the author's approach based on the theory of turbulent flows by A. Tkachuk [9][10][11]. The factor cannot take into account other factors than CO 2 concentration.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The equation (11) takes into account zoning of internal space. The average effective potentials by the equation (9) include the effective potential of inlet air (7) above the air parameters S X averaged by occupied zones. In general, the equation (11) cannot be easy converted to a parameter simplex because it uses the actual air exchange rate and saving air parameters.…”

Section: Efficiency Definition Of Air Exchange Organizationmentioning

confidence: 99%

New Approach for Refined Efficiency Estimation of Air Exchange Organization

Dovhaliuk¹,

Mileikovskyi²,

2018

IJET

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In the modern conditions, energy efficiency is one of the most important world problems. One of the important factors influencing the overall energy efficiency of buildings is air distribution in rooms. Literature review shows different options of efficiency estimation of air exchange with significant limitations. Some of them have non-obvious physical meaning. Certain of them do not take into account possible room zoning. Consideration of turbulence intensity in the efficiency estimation was not found. In this work, we propose an approach to estimate the air exchange efficiency in different kind of rooms. It is a relation of minimum room demands and inlet air potentials. Additional definitions are introduced for the parameters and demands estimation. The mechanical energy of the air is used for the estimation, which includes the energy of averaged motion and turbulent pulsation. Special approach is offered for turbulence intensity computation for energy calculations. The example of efficiency estimation of air exchange in a museum room with constant air volume system of air conditioning is solved.

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“…The simulation can be performed using simplified simulation of turbulent flows [9][10][11]. In the cold period, in order to reduce the transpiration and heat transfer coefficient, on the contrary, it is recommended to install a blind parapet.…”

Section: Figmentioning

confidence: 99%

Energy Efficiency of “Green Structures” in Cooling Period

Tkachenko¹,

2018

IJET

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The proposed methodology for estimating the reduction of CO 2 emissions by green constructions (green roof and facade greening) due to the "cooling effect" during the cooling period allows to calculate CO 2 savings in warm periods of the year. For Kyiv, in July, the reduction of CO 2 emissions per m 2 at coal using is 133 g / m 2 , during the warm period of the year -515 g / m 2 ; using gas -78 g / m 2 and 303 g / m 2 . It is established that the energy savings of a green roof depends on the thickness of the thermal insulation of buildings: the thicker insulation causes the less green roof contribution to energy savings. However, the significance of their effectiveness remains. Green roofs can be especially effective in switching from gas to local solid fuels: peat waste, pellets, etc. As a practical recommendation, it is proposed to coordinate the placement of greened and ungreen parts of the green roof with rooms under the roof, which allows to reduce the refrigeration load on air conditioning. In addition, recommendations on grass care on the green roof have been developed. To maximize the cooling effect, it is necessary to maintain grass height no more than 120 mm. Before the beginning of the transition period, it is necessary to stop mowing the grass, which reduces the cooling effect.

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Geometric analysis of turbulent macrostructure in jets laid on flat surfaces for turbulence intensity calculation

Cited by 9 publications

References 7 publications

Simplified analysis of turbulence intensity in curvilinear wall jets

Simplified analysis of turbulence intensity in curvilinear wall jets

New Approach for Refined Efficiency Estimation of Air Exchange Organization

Energy Efficiency of “Green Structures” in Cooling Period

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