Tip:
Highlight text to annotate it
X
This brief video demonstration illustrates the significant fan performance differences
between a traditional invasive type airflow measuring probe and the Greenheck Sure-Air
flow measuring system. Digital displays will enable us to see airflow volume, fan speed
and input power values.
We'll start by running the fan without the invasive probe. The fan speed is set at one
thousand four hundred forty eight R P M. The airflow will settle in at about six thousand
eighty C F M. The corresponding input power is approximately one thousand one hundred
sixty Watts. This represents the specified fan performance. It also represents the actual
fan performance if a Sure-Air system is used.
Now let's install a traditional flow measurement probe into the airstream. Notice the immediate
and dramatic reduction in airflow. The airflow has dropped to just four thousand seven hundred
forty C F M at the same fan speed. This probe is creating a significant fan system effect
-- and stealing performance from the fan.
In the real world, a test and balance technician would now have to increase the fan speed to
obtain the specified airflow. We'll conclude this demonstration by simulating that task.
To accomplish this, the fan speed is increased to one thousand six hundred eighty two R P
M. As the airflow ramps back up to the specified value of six thousand eighty C F M, notice
also that the input power is climbing to one thousand eight hundred Watts. This is a huge
increase from the specified power of one thousand one hundred sixty Watts.
Let's quickly review our observations. Compared to Sure-Air, the traditional invasive probe
needed sixteen percent greater fan speed to deliver the same airflow. This resulted in
fifty five percent more power consumption and a much louder fan, too.
So for the performance you expect, go with Sure-Air!