Studies on Ventilated Air Movement within Windowless Swine Breeding House (II)

Model Experiment for Winter Ventilation

Abstract

Assuming winter ventilation requirements, a series of model tests was performed using a 1/3 scale model of a windowless swine farrowing house with slotted inlets and dampers on the side wall. It was proved how the incoming jet and the distribution of air in the building are affected by the following: (1) the temperature difference between the inlet vent and representative point within the building, (2) air change rate, and (3) damper angle. The incoming jet fell above the side paths for all tests. The patterns of temperature distribution of the incoming jet, which the damper angle affected, were shown evidently. Three-dimensional distributions of temperature in the building were shown for all the three items above. In terms of temperature distribution, no problem was observed for the air change rate of 15 times per hour in spite of winter ventilation. According to condition of gases and dust particles and so on, it seems that air change rate can be increased more than the generally recommended rate of 5, 6 times per hour.