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Open Rate by Louver Radian
Figure 53: Open Rate by Louver Radian Formula.
ho
ho = h * COS
Total Area (A) = H * W
Number of Open Spaces (N) = (Number of Louvers - 1)
Effective Area (Af) = ho * W * N
Louver Open Rate (n) = Af / A
Af = A * n
Effective Cross Section Area
Confirming Air Flow Rate / Total Opening Rate
• Example: LSU180HSV5 (For illustrative purposes
only).
• Discharge Airflow Rate: 2,119 ft.
• Velocity of Outlet Air: 16.4 ft./s
• Velocity of Inlet Air: 8.2 ft./s
• Open Rate = 80% or More
Open Rate = Effective Face Area (Af)
Total Face Area (A)
• Inlet airflow must match or exceed discharge airflow.
• Separate inlet airflow from discharge airflow to
prevent recirculation.
Formula
• Total Louver Dimension (Excluding Frame) (A) = 3.9 feet x 6.2 feet = 24.2 ft.
• Area Blocked by Outdoor Unit (Discharge) (B) = 2.6 feet x 2.8 feet = 7.41 ft.
• Inlet Louver Dimension (A - B) = 16.8 ft.
• Equivalent Inlet Dimension (Open Rate 80%) = 16.8 ft.
• Equivalent Inlet Airflow = 13.44 ft.
• Equivalent Inlet Airflow / Discharge Airflow = 6,612 ft.
PLACEMENT CONSIDERATIONS
h
Figure 54: Example of Installing Outdoor Unit Indoors.
Louver Dimensions
/min.
3
Unit: Inch
2
x 0.8 = 13.44 ft.
2
x 8.2 ft./s x 60 sec./min. = 6,612 ft.
2
3
/min. / 2,119 ft.
©
Installing Outdoor Units Indoors
W
Side View
Front View
Air Guide Duct on
Outdoor Unit
55-1/8
47-1/4
2
2
2
/min.
3
3
/min. = 312% (Within Allowable Limits)
H
Outdoor Unit
Dimensions
34-1/4
APPLICATION | 77
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