Diagnosis of three types damages to the ventilation system

Voznyak, Orest; Spodyniuk, Nadiia; Sukholova, Iryna; Savchenko, Olena; Kasynets, Mariana; Datsko, Oleksandra

doi:10.29354/diag/145500

Cited by 11 publications

(4 citation statements)

References 34 publications

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“…The positive cooling effect, through a greater convective heat exchange with the human body, without the input of additional energy for cooling, which is desirable in the warm season, can be achieved through increased airflow. The description of the solutions based on periodic change in the volume flow rate and the initial velocity of air diffusers are described in [65,66]. This current article proposes, as one of the thermomodernization measure, the utilization of the original, proprietary technical solution, namely, the two-flow air diffuser (TFAD) presented in Figure 4 [67].…”

Section: Modernization Of Building Installationmentioning

confidence: 99%

“…Connecting the electric actuator, which is controlled from the automation unit, enables the smooth change in volumetric air flow and intensity. As a result, the device works with air volume, which can be increased with a stable air velocity maintained within regulatory limits without any disruptions, and thus, the TFAD is dedicated to variable air volume ventilation systems (VAV) [66].…”

Section: Modernization Of Building Installationmentioning

confidence: 99%

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A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

Voznyak,

Dudkiewicz,

Laska

et al. 2024

Energies

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Energy and economic assessments are of great relevance in the context of decision processes for the most optimal solutions for building renovations. Following the method recommended by UNIDO, economic analyses of thermal modernization options are carried out based on the Simple Payback Time (SPBT), Net Present Value Ratio (NPVR) and Internal Rate of Return (IRR) indices. Incorporating these indicators and a new approach that involves aggregating thermomodernization activities not only in the cold and warm seasons separately, but throughout the whole year, an economic evaluation of the thermomodernization of a production space was carried out. In this case study, the renovation options included wall insulation, window replacement, the installation of infrared heater, a two-flow air diffuser (TFAD) and variable air volume. The economic effect indicated by the highest NPVR over a normative period of 15 years was obtained for the installation of an infrared heater and a TFAD with a variable mode ventilation system. The SPBT for this case was also the lowest.

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Section: Modernization Of Building Installationmentioning

confidence: 99%

Section: Modernization Of Building Installationmentioning

confidence: 99%

A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

Voznyak,

Dudkiewicz,

Laska

et al. 2024

Energies

Self Cite

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“…In addition, air distribution is very important in energy performance [27][28][29][30][31]. The importance rises at variable air volume ventilation [32][33][34][35][36][37]. The device has no simultaneously operated neighbouring air inlet and outlet comparably with a recuperative one, which avoids the exhausting inlet air compared with a recuperative analogue.…”

Section: Introductionmentioning

confidence: 99%

Analysis of critical radius of insulation for horizontal pipes

Vakulenko

Mileikovskyi

Tkachenko

et al. 2023

22nd International Scientific Conference Engineering for Rural Development Proceedings

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Thermal insulation of pipelines is used in different industries including agricultural technologies. Energy efficiency depends on heat losses, which, in turn, are limited by heat insulation. Decentralized ventilation is effective in rural low-rise buildings. One such device used is a regenerative ventilator like Blauberg Vento or Vents TwinFresh. There is a task to improve the efficiency of its operation. Investigation of heat recovery processes in thin ducts is taking place. Experimental uncertainty decreases with better heat insulation of the experimental setup. But in heat transfer literature, there is a notion of the critical radius of insulation. More the insulation radius should decrease its effectiveness due to the development of the outer surface. In the theory, the heat transfer coefficient of the outer surface is assumed to be constant. In this study, laminar convective flow around the outer horizontal cylindrical insulation surface of a large thickness is considered. The formula of the average heat transfer coefficient is used that takes into account the Grashof number. While the insulation thickness is increased, the surface temperature and the heat transfer coefficient are decreased. The function of thermal resistance dependence on the outer diameter related to the inner one and its derivative have been analysed. As a result, an asymptotic increase of thermal resistance was observed without extremums. So, there are no critical diameters if the insulation is so large to obtain laminar convective flow. The maximum radius of thermal insulation should be determined not as critical, but as expedient. Thus, it can provide 5-20% lower heat transfer resistance than the asymptotic one. The radius of thermal pipe insulation of technological devices should be accepted based on technical and economic justification.

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“…The proper microclimate [1][2][3][4][5] in the room is provided by heating and natural or mechanical ventilation systems [6][7][8] with compliance with energy savings requirements [9][10][11][12]. The base element in the natural ventilation system is usually a duct in the premises, which is led above the roof of the building.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics of Different Heights Buildings in Close Proximity

Voznyak¹,

Dudkiewicz²,

Spodyniuk³

et al. 2023

Preprint

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The close proximity of different buildings heights can cause disturbances in the working of the smoke and ventilation ducts of lower buildings, threatening the health and even the lives of residents. To define the influence of high-rise building on the work of the ducts of the neighbouring double-storied building, experimental investigations in the wind tunnel were conducted. On this basis, empirical equations and graphs were developed leading to determining the aerodynamic coefficients considering different wind directions and the height of ducts. The direction of the wind reveals a greater influence than the height of the ducts. Properly using deflectors or increasing the height of the duct ensures maintaining static rarefaction in the area of smoke and ventilation ducts. The creation of rarefaction ensures the reliability of the natural ventilation system and the safety of the health of residents.

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Diagnosis of three types damages to the ventilation system

Cited by 11 publications

References 34 publications

A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

Analysis of critical radius of insulation for horizontal pipes

Aerodynamic Characteristics of Different Heights Buildings in Close Proximity

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