Influence of different ventilation systems on air velocity fields in weaning pigs houses

Abstract

Influence of different mechanical extraction ventilation systems on air velocity fields in weaned piglets houses was analyzed and discussed in this work. Airflow velocities have been measured in 20 measuring points, smoothly positioned over the house cross section, in the net consisting of 4 horizontal and 5 vertical rows. Lowest horizontal row was positioned at the piglets breathing zone (40 cm above the floor), and the highest (fourth) horizontal row was positioned at the workers breathing zone (160 cm). Control values were measured in houses with closed doors and windows, and all the fans switched off. These values were compared with three experimental sets of values, achieved with: floor, roof and both ventilation systems. The airflow velocities in ventilation ducts were measured with a turbine anemometer, and in measuring points inside the building with hot wire anemometer.

U radu je analiziran uticaj primene nekih sistema ventilacije na brzine strujanja stajskog vazduha u objektima za odgoj prasadi. Brzine strujanja vazduha su merene u po 20 mernih tačaka, ravnomerno raspoređenih po mernom preseku, u 4 horizontalna i 5 vertikalnih nizova. Donji niz tačaka je bio u zoni disanja prasadi (40 cm), a četvrti gornji u zoni disanja zaposlenih (160 cm). Kontrolne vrednosti su merene u objektu sa isključenim ventilatorima i zatvorenim prozorima, a tri ogledne varijante obuhvataju: podni, krovni i oba ventilaciona sistema. Brzina strujanja vazduha u ventilacionim kanalima je merena turbinskim anemometrom, a u objektu anemometrom sa toplom žicom.