Ahu cooling coil row calculation

[san710]

is there any thumb rule for the no of rows for chilled
Water
or dx cooling coil in ahu

[Brian_UK]

Not that I know of.

[nevinjohn]

Well, if its dealing with full fresh air, a min of 8 row deep is suggested, and for recirculation type with 10-15% fresh air, go with 4 row deep.

[DTLarca]

Surely, if it's full fresh air then you want to maximise the bypass factor so as not to over cool the space ?!

If so then reduced rows are called for.

[Brian_UK]

Shouldn't worry Marc, he's a one post wonder from last September ;)

Although, of course, your observation is valid.

[DTLarca]

Brian, I guess it would also depend on occupancy numbers versus load. The higher the occupancy the greater the BPF required. A low occupancy but with a high load would indeed mean more rows required if one wanted smaller ducts and fan i.e. low air volumes.