Factors affecting the location of the neutral point in ventilation systems
Mining Engineering, 2012, Vol. 64, No. 6, pp. 28-28
Wem, J.M.; Calizaya, F.
Booster fans in underground coal mines are often located using the concept of a neutral point. Normally, intake airways are maintained at higher absolute pressure than return airways; therefore, air leaks from intake to return. By adding a significant pressure force to a region of a ventilation system, booster fans installed in a return airway can increase the pressure in the return so that air leaks from return to intake. This is commonly referred to as recirculation. The neutral point occurs at the location in the system where the pressure difference between the intake and the return airway is zero. At this point, there is no leakage or recirculation. Ideally, placing a booster fan near the neutral point minimizes leakage and recirculation. However, in practice, the position of the neutral point is not static and it changes as the ventilation system parameters change.
Please login to access this article.
If you are not an SME member, you can join SME by clicking the button below.