CONTAMINANT AND HEAT REMOVAL EFFECTIVENESS OF THREE VENTILATION SYSTEMS IN NURSERY ROOMS FOR PIGS

摘要

In this research, three ventilation systems (ground channel, porous ceiling, and door ventilation) were tested on their performance in supplying fresh air to the animal occupied zone (AOZ), each in a room for 70 weaned piglets. Measurements of the CO ₂ concentration and temperature of the inlet air, at one point in the AOZ, and in the outlet air were recorded every 36 minutes for three successive batches. Less frequent measurements were done on the CO ₂ concentration in two other points in the AOZ. System effectiveness was expressed as the contaminant removal effectiveness (CRE) for CO ₂ and the heat removal effectiveness (HRE): CRE or HRE equals 1 when the CO ₂ concentration or temperature in the AOZ equals that of the outlet air. Values lower than 1 reflect higher CO ₂ concentrations or temperatures within the AOZ; values higher than 1 the reverse