Relief air fan for VAV system
Relief air fan for VAV system
(OP)
I am air conditioning a very large floor plate approx 2000m2
I am using a single AHU (VAV mostly internal zones)
I have decided to have approx 4 No. relief air fans on the roof.
What is the best way of tracking the supply air fan and the relief air fan.
I was thinking of having a velocity probe int he fresh air intake duct and at the relief air fans. If the O/A goes up the relief air fans will ramp up to discharge the increased volume. Are these reliable means. Is there another waY?
I am using a single AHU (VAV mostly internal zones)
I have decided to have approx 4 No. relief air fans on the roof.
What is the best way of tracking the supply air fan and the relief air fan.
I was thinking of having a velocity probe int he fresh air intake duct and at the relief air fans. If the O/A goes up the relief air fans will ramp up to discharge the increased volume. Are these reliable means. Is there another waY?





RE: Relief air fan for VAV system
Andy W
RE: Relief air fan for VAV system
Another cheap and practical option is to get your return air fan VSD to track the AHU VSD.Most VSDs have this option.
RE: Relief air fan for VAV system
SAK, FMS can be located within the fan scroll. A normal practice these days. Check with Flow measuring technology or some other MFTR.
RE: Relief air fan for VAV system