Face Areas- Air Pressure Drops, Dry Coils
Face Area of Coils, And Filters ( Used to Compute Velocity for Air Pressure Drop)
Face Area |
|
|
|
|
| Air Handler Unit Size |
|
|
|
|
|
| |||
Square Feet | 03 | 06 | 08 | 10 | 12 | 14 | 18 | 20 |
| 26 | 34 | 41 | 50 | 65 | 75 |
Steam coils: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Large Type 5 Coils | 2.75 | 5.28 | 7.50 | 9.38 | 11.69 | 13.75 | 16.88 | 19.25 |
| 25.50 | 34.00 | 40.38 | 47.25 | ||
Large Type 8 Coils |
| 62.00 | 72.33 | ||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Water & Refrigerant: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Large Type A Coils | 3.13 | 5.76 | 7.81 | 9.77 | 12.40 | 14.58 | 17.71 | 20.05 |
| 26.56 | 33.65 | 40.73 | 50.63 | 64.58 | 75.35 |
Large Type 5 Coils | 3.00 | 5.69 | 7.50 | 9.38 | 11.69 | 13.75 | 14.58 | 16.71 |
| 25.50 | 34.00 | 40.38 | 49.50 | 64.58 | 74.92 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Filter Face Area: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Flat Filter Sections | 5.00 | 6.94 | 10.00 | 11.11 | 15.00 | 17.50 | 22.50 | 24.44 |
| 31.11 | 38.89 | 46.67 | 54.40 | 73.33 | 82.50 |
High Capacity Sections | 10.00 | 13.89 | 16.67 | 19.44 | 22.22 | 25.00 | 37.50 | 31.94 |
| 40.28 | 64.44 | 80.56 | 104.17 | 137.50 | 160.42 |
High Efficiency Section | 6.00 | 8.00 | 12.00 | 14.00 | 14.00 | 18.00 | 24.00 | 24.00 |
| 30.00 | 40.00 | 50.00 | 60.00 | 66.00 | 88.00 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Type A (1/2" O.D.) Dry Coil Air Pressure Drop*
Rows | Fins | Air Velocity^ - Feet per minute |
|
| ||||
|
| 400 | 450 | 500 | 550 | 600 | 650 | 700 |
| 6 | 0.05 | 0.05 | 0.07 | 0.08 | 0.09 | 0.10 | 0.11 |
| 8 | 0.06 | 0.07 | 0.08 | 0.09 | 0.11 | 0.12 | 0.14 |
1 | 10 | 0.07 | 0.08 | 0.10 | 0.11 | 0.13 | 0.15 | 0.17 |
| 12 | 0.08 | 0.10 | 0.11 | 0.13 | 0.15 | 0.17 | 0.19 |
| 14 | 0.09 | 0.11 | 0.13 | 0.15 | 0.17 | 0.19 | 0.21 |
| 6 | 0.09 | 0.11 | 0.13 | 0.15 | 0.18 | 0.20 | 0.23 |
| 8 | 0.11 | 0.14 | 0.16 | 0.19 | 0.22 | 0.25 | 0.28 |
2 | 10 | 0.14 | 0.16 | 0.19 | 0.23 | 0.26 | 0.29 | 0.33 |
| 12 | 0.16 | 0.19 | 0.22 | 0.26 | 0.30 | 0.34 | 0.38 |
| 14 | 0.18 | 0.22 | 0.25 | 0.29 | 0.34 | 0.38 | 0.43 |
| 6 | 0.14 | 0.16 | 0.20 | 0.23 | 0.26 | 0.30 | 0.34 |
| 8 | 0.17 | 0.21 | 0.24 | 0.28 | 0.33 | 0.37 | 0.42 |
3 | 10 | 0.20 | 0.25 | 0.29 | 0.34 | 0.39 | 0.44 | 0.50 |
| 12 | 0.24 | 0.29 | 0.34 | 0.39 | 0.45 | 0.51 | 0.57 |
| 14 | 0.27 | 0.32 | 0.38 | 0.44 | 0.50 | 0.57 | 0.64 |
| 6 | 0.18 | 0.22 | 0.26 | 0.31 | 0.35 | 0.40 | 0.46 |
| 8 | 0.23 | 0.27 | 0.33 | 0.38 | 0.44 | 0.50 | 0.56 |
4 | 10 | 0.27 | 0.33 | 0.39 | 0.45 | 0.52 | 0.59 | 0.66 |
| 12 | 0.32 | 0.38 | 0.45 | 0.52 | 0.60 | 0.68 | 0.76 |
| 14 | 0.36 | 0.43 | 0.51 | 0.59 | 0.67 | 0.76 | 0.85 |
| 6 | 0.27 | 0.33 | 0.39 | 0.46 | 0.53 | 0.60 | 0.68 |
| 8 | 0.34 | 0.41 | 0.49 | 0.57 | 0.66 | 0.75 | 0.84 |
6 | 10 | 0.41 | 0.49 | 0.58 | 0.68 | 0.78 | 0.88 | 0.99 |
| 12 | 0.47 | 0.57 | 0.67 | 0.78 | 0.89 | 1.01 | 1.14 |
| 14 | 0.54 | 0.65 | 0.76 | 0.88 | 1.01 | 1.14 | 1.28 |
| 6 | 0.36 | 0.44 | 0.52 | 0.61 | 0.71 | 0.81 | 0.91 |
| 8 | 0.45 | 0.55 | 0.65 | 0.76 | 0.87 | 0.99 | 1.12 |
8 | 10 | 0.54 | 0.66 | 0.78 | 0.90 | 1.04 | 1.18 | 1.32 |
| 12 | 0.63 | 0.76 | 0.90 | 1.04 | 1.19 | 1.35 | 1.52 |
| 14 | 0.72 | 0.86 | 1.02 | 1.18 | 1.35 | 1.52 | 1.71 |
|
|
|
|
|
|
|
|
|
Type 5 (5/8" O.D.) Dry Coil Air Pressure Drop*
Rows | Fins |
| Air Velocity^ - Feet per minute |
|
| ||||
|
| 400 | 450 | 500 | 550 | 600 |
| 650 | 700 |
| 6 | 0.07 | 0.09 | 0.11 | 0.13 | 0.15 |
| 0.17 | 0.20 |
| 8 | 0.09 | 0.11 | 0.13 | 0.16 | 0.18 |
| 0.21 | 0.24 |
1 | 10 | 0.11 | 0.13 | 0.16 | 0.18 | 0.21 |
| 0.25 | 0.28 |
| 12 | 0.12 | 0.15 | 0.18 | 0.21 | 0.24 |
| 0.28 | 0.31 |
| 14 | 0.14 | 0.17 | 0.20 | 0.23 | 0.27 |
| 0.31 | 0.35 |
| 6 | 0.13 | 0.17 | 0.20 | 0.24 | 0.28 |
| 0.32 | 0.37 |
| 8 | 0.17 | 0.21 | 0.25 | 0.29 | 0.34 |
| 0.39 | 0.44 |
2 | 10 | 0.20 | 0.24 | 0.29 | 0.34 | 0.40 |
| 0.45 | 0.52 |
| 12 | 0.23 | 0.28 | 0.33 | 0.39 | 0.45 |
| 0.51 | 0.58 |
| 14 | 0.25 | 0.32 | 0.37 | 0.43 | 0.50 |
| 0.57 | 0.65 |
| 6 | 0.20 | 0.25 | 0.30 | 0.36 | 0.42 |
| 0.48 | 0.55 |
| 8 | 0.25 | 0.31 | 0.37 | 0.44 | 0.51 |
| 0.59 | 0.67 |
3 | 10 | 0.30 | 0.36 | 0.43 | 0.51 | 0.59 |
| 0.68 | 0.77 |
| 12 | 0.34 | 0.41 | 0.50 | 0.58 | 0.67 |
| 0.77 | 0.87 |
| 14 | 0.38 | 0.46 | 0.55 | 0.65 | 0.75 |
| 0.86 | 0.97 |
| 6 | 0.27 | 0.33 | 0.40 | 0.48 | 0.56 |
| 0.65 | 0.74 |
| 8 | 0.33 | 0.41 | 0.49 | 0.58 | 0.68 |
| 0.78 | 0.89 |
4 | 10 | 0.39 | 0.48 | 0.58 | 0.68 | 0.79 |
| 0.91 | 1.03 |
| 12 | 0.45 | 0.55 | 0.66 | 0.78 | 0.90 |
| 1.03 | 1.16 |
| 14 | 0.51 | 0.62 | 0.74 | 0.87 | 1.00 |
| 1.14 | 1.29 |
| 6 | 0.40 | 0.50 | 0.60 | 0.72 | 0.84 |
| 0.97 | 1.11 |
| 8 | 0.50 | 0.62 | 0.74 | 0.87 | 1.02 |
| 1.17 | 1.33 |
6 | 10 | 0.59 | 0.72 | 0.87 | 1.02 | 1.19 |
| 1.36 | 1.55 |
| 12 | 0.68 | 0.83 | 0.99 | 1.16 | 1.35 |
| 1.54 | 1.75 |
| 14 | 0.76 | 0.93 | 1.11 | 1.30 | 1.50 |
| 1.71 | 1.94 |
| 6 | 0.54 | 0.67 | 0.80 | 0.96 | 1.12 |
| 1.29 | 1.47 |
| 8 | 0.67 | 0.82 | 0.99 | 1.17 | 1.36 |
| 1.56 | 1.78 |
8 | 10 | 0.79 | 0.97 | 1.16 | 1.36 | 1.58 |
| 1.82 | 2.06 |
| 12 | 0.91 | 1.11 | 1.32 | 1.55 | 1.80 |
| 2.06 | 2.33 |
| 14 | 1.02 | 1.24 | 1.48 | 1.73 | 2.00 |
| 2.28 | 2.58 |
|
|
|
|
|
|
|
|
|
|
Type 8 (1" O.D.) Dry Coil Air Pressure Drop*
Rows | Fin |
| Air Velocity^ - Feet | per minute |
| |||
|
| 400 | 450 | 500 | 550 | 600 | 650 | 700 |
| 6 | 0.05 | 0.06 | 0.07 | 0.09 | 0.10 | 0.11 | 0.13 |
| 8 | 0.07 | 0.08 | 0.10 | 0.12 | 0.13 | 0.15 | 0.17 |
1 | 10 | 0.09 | 0.11 | 0.12 | 0.14 | 0.16 | 0.19 | 0.21 |
| 12 | 0.10 | 0.13 | 0.15 | 0.17 | 0.20 | 0.22 | 0.25 |
| 14 | 0.12 | 0.15 | 0.17 | 0.20 | 0.23 | 0.26 | 0.29 |
*Dry coil air pressure drop for air entering at 70 °F DB, 0 °F WB over rippled high efficiency fins. Inches of water. ^ Air velocity = CFM divided by coil face area in square feet. See table at top of page 40.
40