Air velocity fields distribution in tied cows building by different roof cooling fans working regimes

Abstract

Analysis of roof cooling fans function in several working regimes is presented. The main goal of the research was to define the influence of fan working regime on distribution of air velocity fields. During the different fan speeds, the measurements were conducted in characteristic building sections. Air flow velocity measurements were conducted in were 48 measuring points selected, in 4 height levels, which totally covered the room. Comparative analysis of air flow velocities showed the effects of fans function in particular zones, as well as potential problems that ventilation system may provide. It was concluded that this fans disposal doesn't achieve satisfactory results in every experimental setup. Particular fans operation regimes create air flow velocities above the thresholds. The change of fans setup was recommended, as well as use of lower fans working speeds.

Analiza rada višerežimskih ventilatora u objektu za vezano držanje krava imala je za cilj da odredi distribuciju brzinskih polja vazduha, kao osnove za provetravanje - ventilaciju objekta. Ispitivan je uticaj ventilatora pri različitim režimima rada (različitim brzinama rotora), pri čemu su merenja vršena u karakterističnim zonama objekta. Merenje brzine strujanja vazduha je izvršeno u 48 mernih tačaka, na 4 nivoa merenja, čime je objekat u potpunosti pokriven. Analiza rezultata merenja je otkrila kakvi su efekti rada ventilatora u pojedinim zonama objekta, kao i potencijalne probleme primene ovakvog sistema ventilacije. Zaključak je da ovakva postavka ventilatora ne daje u potpunosti zadovoljavajuće rezultate, kao i da pojedini režimi rada ventilatora proizvode strujanja vazduha koja po intenzitetu daleko premašuju dozvoljene vrednosti. Preporuka je da se postavka ventilatora promeni, kao i da se ventilatori koriste uglavnom u nižim režimima rada.