Well I finally found time to do a bit of very provisional testing using BME and BMP pressure sensors.
It looks like it is going to work as there is a measurable pressure difference when the airflow is restricted. I hacked together a very basic test rig with a sensor in a sealed box with a tube going to the back of the fan and the other sensor hanging outside and was getting pressure differences of nearly 0.9atm between an unobstructed and 20% obstructed airflow - I think this is roughly when efficiency starts to be lost.
So now to build and incorporate the sensors into the machine and some further testing. Plenty of time till next winter to fine tune it..
Acuario
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