Building a bridge between industry and theory on the example of a new ventilation system

Abstract

The paper presents the possibilities of simplified determination of the air volumetric flow rate in ventilation ducts. This problem occurred during the tests of local losses in the elements of a new ventilation system based on ducts with a rounded rectangular cross-section. The presented method requires mathematical modelling of the flow velocity distribution in the ducts. The paper presents four models of the velocity distribution. The necessity of using so many models resulted from the wide coverage of the tested sections: Amax/Amin= 46.88.

Tuning of Adjustable Parameters of Hwa Hardware During Development of New Type Ventilation System

“…The number of samples 8 n = also introduced another negative conclusion -tests carried out at the same point were characterized by a significant dispersion which was not observed for the equal n = 4 096. A similar analysis that also gave positive results was done in Smyk et al, 2017. Conducted measurements were industrial research (Peszyński, 2018). They are characterized by lower accuracy required.…”

Numerical Verification of Velocity Distribution Models in a Selected Ventilation Duct

“…The duct with a rounded rectangular cross-section begins with its downstream assembly (Peszyński, 2018) into the mask of the tubular air deflector. From 79 different cross-sections examined for analysis in this article, the one shown in Fig.…”

“…The adjective "uniform" has been added in the title of this subsection, because in subsection 3.2 the cross-section divided into two parts will be analyzed. Average velocity is determined by formula (Peszyński, 2018…”

“…In view of the above, the volumetric flow rate was determined on the basis of derived mathematical models based on the velocity distribution along two perpendicular symmetry axes of the cross-section. A total of 4 models of volumetric flow rate determination were developed (Peszyński, 2018).…”

Linear Pressure Losses Coefficients in a New Ventilation System

“…For this type of cross-section, models based on the virtual division of the cross-section into a square and a slot have been developed (Peszyński et al1 2017). In total, four models of velocity distribution were developed, and their comparison shows the last cycle paper (Peszyński, 2018). The developed models were verified experimentally.…”