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CFM to FPS Equation:
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The CFM to FPS (Cubic Feet per Minute to Feet per Second) equation calculates air velocity in feet per second based on air flow in cubic feet per minute and cross-sectional area in square feet. It is commonly used in HVAC systems for air conditioning calculations.
The calculator uses the CFM to FPS equation:
Where:
Explanation: The equation converts volumetric flow rate (CFM) to linear velocity (FPS) by accounting for the cross-sectional area through which the air is flowing.
Details: Accurate FPS calculation is crucial for proper HVAC system design, ensuring adequate air distribution, maintaining comfort levels, and optimizing energy efficiency in air conditioning systems.
Tips: Enter CFM in ft³/min and Area in ft². All values must be valid (CFM > 0, Area > 0). The calculator will compute the air velocity in feet per second.
Q1: Why convert CFM to FPS?
A: Converting CFM to FPS helps determine air velocity, which is important for assessing air movement, comfort levels, and system performance in HVAC applications.
Q2: What are typical FPS values for AC systems?
A: Typical values range from 300-700 FPS for supply ducts and 500-900 FPS for return ducts, depending on the specific system design and requirements.
Q3: How does area affect FPS?
A: For a constant CFM, a smaller area results in higher FPS, while a larger area results in lower FPS. This relationship is inversely proportional.
Q4: Can this calculation be used for rectangular ducts?
A: Yes, but the area must be calculated correctly. For rectangular ducts, area = width × height (in feet).
Q5: What are the limitations of this calculation?
A: This calculation assumes uniform air flow and doesn't account for factors like turbulence, friction losses, or variations in air density that may occur in real-world applications.