Air Density (Temperature and Altitude) Air density is a variable of elevation and temperature, and both these variables affect fan air performance. Air density will affect the total pressure that a fan can generate and the horsepower required to move the air. Most fan performance is published at a density based on air at 70°F …
Troubleshooting is the effort to identify and resolve differences between what was expected and what actually happened. The following four categories narrow the focus of attention and speeds up the evaluation process. Aerodynamic Performance – This applies to any of the five rating parameters of flow, pressure, speed, power and density and how they compare …
Noise is generally considered low quality, unwanted sound. The primary selection criterion for a fan is based not on its acoustical characteristics but on its ability to move the required amount of air against the required pressure. In addition, the fan must do so at a reasonable initial cost (it also may be required to …
Fans are constructed from many different materials, and like everything else, there are pros and cons to any option. Heavy solid-blade fans may experience extended starting times due to the high inertia load that the motor must accelerate to speed. It is not unusual to have electric motor overloads trip from extended starting times when …
Fan laws relate the performance characteristics of any geometrically similar series of fans. CFM, RPM, SP and HP are all related to each other in a known manner and when one changes, all others change. The CFM variable is the most commonly changed measurement in an air moving system therefore the following example of Fan …
Centrifugal –Operating principle is a combination of deflection by the blades as well as the centrifugal force exerted on the air rotating with the wheel and thereby moving outward in a radial direction. Axial and centrifugal fans have overlapping capabilities in terms of pressure, airflow, and efficiency; however, usually they are not interchangeable. For the …
Blowers are one of the mechanisms used regularly in submarines. They are installed in ventilation and air conditioning systems in almost all submarine compartments. Ventilation systems usually presented by central systems include supply and exhaust fans, serve for ventilation of accommodation and other than accommodation areas with atmospheric air with simultaneous ventilation of storage batteries …
The Working Principle and Operation of Centrifugal Blower Read More »
In order to generate the fan performance data used in the analysis DOE(Department of Energy) applied the following procedure (the 3-ton baseline PSC motor for non-weatherized (non-condensing) gas furnaces is used as an example): STEP 1: Using the coefficients to generate for airflow (cfm) vs. pressure and watts/cfm vs. pressure curves at each airflow speed …
How to Determine the Fan Curves for Each Efficiency Level and Product Class Read More »