Abstract
Inlet baffles in slotted-inlet ventilation systems should promote suitable air distribution and mixing, and mixing pattern stability within the ventilated space. Factors which determine suitability and stability include: the volumetric flow rate of ventilation air, air space volume, and the speed with which air enters the space. These factors can be combined to form an inlet jet momentum number, which may be interpreted as a measure of the total momentum flow of the inlet (fresh and/or recirculated) air, normalized by the volume of the ventilated space. This article shows how inlet jet momentum number isolines can be superimposed on system characteristic graphs for slotted-inlet ventilation systems. This concept is developed and demonstrated as a potential basis to control slotted-inlet ventilation systems in a way to provide desired air speeds at animal levels, and stable air flow patterns. Thermal buoyancy effects and desired air speeds around the animals may affect the value of the inlet momentum number which is desired.
Published Version
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