Information on the concentration of dust particles is an important
microclimate parameter that characterizes the local environmental quality of
each livestock building. Increased concentration of dust particles primarily
affects the indoor air quality and, consequently, the animal and workers
health. Among many others, ventilation rate is a vital parameter that
controls the spatial distribution of airborne dust particles in livestock
buildings. This was the main motive for authors of this paper to research the
influence of rotation rate of under-roof axial fans (i.e. the air flow rate)
on airborne dust particles distribution crossover the barn specified for tied
cows breeding. During a series of performed experiments, six different air
flow rates have been maintained in the range between 0 m3?h-1 and 48000
m3?h-1. Flow rate has been controlled by special electronic control unit,
which provided six different rotation rates of two under-roof fans, including
the neutral regime (natural ventilation only). Measurements have been
performed at four typical height levels (0,5 m; 1,0 m; 1,5 m and 2,0 m),
cross-over the three lateral and four longitudinal characteristic building
sections. Consequently, 48 measuring points were appropriately selected, in
order to cover the indoor space in adequate way. Comparative analysis of air
flow velocities and dust concentrations showed that this fan setup may give
satisfactory results under adequate operational regime. Certain working
regimes were recommended for use, and the third rotation rate step,
generating the airflow of 37300 m3?h-1 or indoor air exchange level of
approximately 25 h-1, has been found as the most suitable. Projekat
Ministarstva nauke Republike Srbije, br. TR31086: Optimization of
technological procedures and zoo-technical resources on farmsin purpose of
milk production sustainability improvement, br. TR 31051: Improvement of
biotechnological procedures as a function of rational utilizationof energy,
agricultural products productivity and quality increase, br. III46009:
Improvement and development new technological procedures in production
ofanimal products, to achieve high quality and safe competitive products
inmarket i br. OI 174011: Dynamical stability and instability of mechanical
systems exposed to stochasticdisturbances