1. What is the Quantity of Air Formula?

The Quantity of Air formula calculates the volumetric flow rate of air through a duct or airway by multiplying the velocity of air by the cross-sectional area of the duct. This provides a measure of how much air is moving through the system per unit time.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Quantity of Air (m³/s)
• \( V \) — Velocity of Air (m/s)
• \( A_{cs} \) — Cross-Sectional Area of Duct (m²)

Explanation: The formula calculates the volumetric flow rate by multiplying the air velocity by the cross-sectional area through which the air is flowing.

3. Importance of Air Quantity Calculation

Details: Calculating air quantity is essential for HVAC system design, ventilation requirements, industrial process control, and ensuring adequate air quality in enclosed spaces.

4. Using the Calculator

Tips: Enter air velocity in meters per second (m/s) and cross-sectional area in square meters (m²). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What units should be used for the inputs?
A: Velocity should be in meters per second (m/s) and area should be in square meters (m²) for the result to be in cubic meters per second (m³/s).

Q2: Can this formula be used for liquids as well?
A: Yes, this fundamental flow rate formula applies to both gases and liquids flowing through a conduit.

Q3: What if the duct is not circular?
A: The formula works for any cross-sectional shape as long as you use the correct cross-sectional area measurement for that shape.

Q4: How accurate is this calculation?
A: The calculation is mathematically precise, but accuracy depends on the precision of your velocity and area measurements.

Q5: Can I use different units?
A: Yes, but you'll need to ensure unit consistency. For example, if velocity is in ft/s and area is in ft², the result will be in ft³/s.