Air temperature and humidity variations in the tied cows house 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 inside air temperature and velocity. Those two are the main microclimate parameters. Their values should be maintained in optimal ranges. During the different fan speeds, the measurements were conducted in characteristic building sections. Air temperature and humidity 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. The change of fans setup was recommended, as well as possibility of a third fan installation, along with some building corrections.

U radu je prikazana analiza rada krovnih ventilatora u više režima rada. Cilj je da se utvrdi efekat rada ventilatora na temperaturu i vlažnost vazduha. Temperatura i vlažnost vazduha predstavljaju dva veoma važna činioca mikroklime objekta, čije vrednosti treba da se kreću u optimalnim granicama. Ispitivan je uticaj ventilatora pri različitim režimima rada (različitim brzinama rotora), pri čemu su merenja vršena u karakterističnim zonama objekta. Merenje temperature i relativne vlažnosti 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. Preporuka je da se donekle izmeni postavka ventilatora, kao i da se razmotri mogućnost ugradnje još jednog ventilatora, uz manju adaptaciju objekta.