Chill water Coil Airflow
Chill water Coil Airflow
(OP)
On a large old central AHU (30000 cfm), the maintenance wants to increase the airflow. I think that the chill water coil should have been designed for a specific airflow and we can not just increase the fan cfm. Please comment.
Thanks
Thanks





RE: Chill water Coil Airflow
You can change the airflow, increasing it will give you more total cooling and a reduction in latent capacity.
Increasing it too much can result in mositure carry over also.
Sometimes addressing duct leakage results in more airflow to the space.
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Chill water Coil Airflow
RE: Chill water Coil Airflow
Is there a name for this max air velocity (max face velocity or max tube film velocity) or something technical like that.
thanks,
RE: Chill water Coil Airflow
Because of the difficulty in predicting variations in localized coil velocities, avoid blow-through designs when possible. When a blow-through design is necessary, limit cooling-coil face velocity at design conditions to less than 500 fpm to avoid carryover from certain sections of the coil.
RE: Chill water Coil Airflow
Draw through on big sensible loads, CAN force you to overdehumidify air to compensate for fan reheat,and force you to move more air.
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Chill water Coil Airflow
Abby, I've done a couple blow through and always ended up using a profile plate (large pressure drop!) to ensure even flow over the coil.
Do you do something similar?
RE: Chill water Coil Airflow
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Chill water Coil Airflow
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Chill water Coil Airflow
RE: Chill water Coil Airflow
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Chill water Coil Airflow
RE: Chill water Coil Airflow
RE: Chill water Coil Airflow
Take the "V" out of HVAC and you are left with a HAC(k) job.