An Example For You To Try

 

An electrostatic precipitator system was set up so that there were two identical sections in parallel.
It had an efficiency of 95%.

The area of each half of the system was 2000 m2. The total flow was 200m3/s.
An operator set up the system so that the flow rates were no longer evenly distributed. One side was receiving twice as much as the other.

What was the new overall efficiency?

How to solve this:

We could assume a nominal particle concentration of 1 unit,
Calculate w then calculate efficiency at each side of the new system.
From efficiency and input concentration we calculate new output concentrations.
Find total output load in mass/time
Calculate new efficiency.
There are other ways but this is the easiest.