The formula to calculate the Duct Leakage (DL) is:
\[ DL = DF \cdot \frac{AL}{100} \]
Where:
Let's say the duct design flow (\( DF \)) is 1000 CFM, and the allowable leakage percent (\( AL \)) is 5%. Using the formula:
\[ DL = 1000 \cdot \frac{5}{100} \]
We get:
\[ DL = 1000 \cdot 0.05 = 50 \text{ CFM} \]
So, the Duct Leakage (\( DL \)) is 50 CFM.
Duct leakage refers to the amount of air that escapes from the duct system in a heating, ventilation, and air conditioning (HVAC) system. It is an important factor in the efficiency and performance of the HVAC system. Calculating duct leakage helps in identifying and addressing inefficiencies, ensuring optimal performance and energy savings.
Formula: \( \text{Allowable Leakage} = \text{Leakage Class} \times \text{Duct Surface Area} \)
Example: \( \text{Allowable Leakage} = 3 \times 100 \)
Formula: \( \text{Defect Leakage} = \frac{\text{Number of Defects Found in Testing}}{\text{Total Number of Defects}} \times 100 \)
Example: \( \text{Defect Leakage} = \frac{20}{50} \times 100 \)
Formula: \( \text{Air Leak Cost} = \text{Leak Rate} \times \text{Operating Hours} \times \text{Cost per Unit of Air} \)
Example: \( \text{Air Leak Cost} = 5 \times 2000 \times 0.1 \)
