Ventilation system for livestock building, has controllable air mixer controlled based on air flow rate of forced air circulation unit to replace air extracted from zone ventilated by circulation unit, with fresh air stream

摘要

The system has an air recycling circuit (13) extended between an inner air inlet (3) of a casing (1) and an air outlet (18) opening in an air supply circuit (10). The recycling circuit comprises, in its connection zone with the supply circuit, a controllable air mixer for obtaining a fresh air stream, recycled air stream or fresh and recycled air mixture at an outlet of the supply circuit. The mixer is controlled based on air flow rate of a forced air circulation unit (11) e.g. fan, to replace air extracted from a zone (16) ventilated by the circulation unit, with the fresh air stream.