As you have known, you must know what the capacity of a fan is before you consider opening a damper or increasing the fan speed. Doing so may not be safe—it could result in an overloaded motor, for example, or an unusually high power consumption—so you should be able to predict the results of any …
As we already know, fan selection is a complicated process that starts with a basic knowledge of system operating requirements and conditions such as airflow rates, temperatures, pressures, airstream properties, and system layout. The variability of these factors and other considerations, such as cost, efficiency, operating life, maintenance, speed, material type, space constraints, drive arrangements, …
Positive Displacement (PD) Lobe Blowers Lobe type blowers are simple and have been widely used in aerating wastewater for over 100 years. Positive displacement (PD) blowers, specifically in this case rotary lobe blowers, are the most used technology for blower applications, especially for medium to small flows. Lobe type blower efficiency is poor due to …
Introduction Fans and blowers provide air for ventilation and industrial process requirements. Fans generate a pressure to move air (or gases) against a resistance caused by ducts, dampers, or other components in a fan system. The fan rotor receives energy from a rotating shaft and transmits it to the air. Difference between Fans, Blowers and …
Fan selection is a complex process that starts with a basic knowledge of system operating conditions: air properties (moisture content, temperature, density, contaminant level, etc.), airflow rate, pressure, and system layout. When selecting a fan, the following information must be known. Volume of air to be moved per unit time Static pressure-the estimated system resistance …
Precise determination of air-flow and required outlet pressure are most important in proper selection of fan type and size. The air-flow required depends on the process requirements; normally determined from heat transfer rates, or combustion air or flue gas quantity to be handled. System pressure requirement is usually more difficult to compute or predict. Detailed …
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 static pressure (SP) is the useful working pressure available for overcoming …
Fan drives can be reduced to two basic types: indirect drives (belt drives) and direct drives. Both types have strengths and weaknesses that should be considered carefully during selection. For a summary of the differences between direct and indirect drives, see Table C in the Appendix. Indirect (Belt) Drives Indirect drives, or belt drives, are …