Fan Characteristics
There are three basic principles of fan operation which can serve to aid in understanding and finding solutions to motor application problems. These are speed, pressure and air density……
The most commonly used fan characteristic is the relationship between pressure rise and volume flow rate for a constant impeller speed (RPM). The air movement has a pressure associated with it, which is termed as static pressure (SP) and the velocity pressure (VP)……
The term “system resistance” is used when referring to the static pressure. The system resistance is the sum of static pressure losses in the system. The system resistance is a function of the configuration of ducts, pickups, elbows and the pressure drops across Fans and Blowers equipment-for example bagfilter or cyclone……
By using group of various variables the compressible machines characteristics can be explained. Generally the characteristic of a centrifugal compressor is obtained by plotting overall pressure ratio, p03/p01, against the mass flow parameter, m√T01/p01 for a particular constant speed parameter……