How is CH4 make calculated?

How is CH4 make calculated?

• A. CH4 × Vent Quantity × 2 = L/s
• B. Vent Quantity × CH4 × 5 = L/s
• C. CH4 × Vent Quantity × 10 = L/s
• D. CH4 × Vent Quantity × 15 = L/s

Answer: (C)

The calculation hinges on turning methane concentration in the air and the ventilation flow into a methane emission rate in litres per second. Methane concentration is given as a percentage by volume, and ventilation quantity is the air flow in cubic metres per second. To get litres per second, convert the percentage to a decimal (divide by 100) and convert cubic metres to litres (multiply by 1000). So the methane make rate becomes CH4% × VentQuantity × (1000/100) = CH4 × VentQuantity × 10. For example, if CH4 is 2% and the ventilation rate is 5 m3/s, the rate is 2 × 5 × 10 = 100 L/s. This aligns with 0.02 × 5 m3/s = 0.1 m3/s, which is 100 L/s. Using any multiplier other than 10 would not correctly account for the unit conversions, so the correct form is CH4 × VentQuantity × 10 = L/s.

The calculation hinges on turning methane concentration in the air and the ventilation flow into a methane emission rate in litres per second. Methane concentration is given as a percentage by volume, and ventilation quantity is the air flow in cubic metres per second. To get litres per second, convert the percentage to a decimal (divide by 100) and convert cubic metres to litres (multiply by 1000). So the methane make rate becomes CH4% × VentQuantity × (1000/100) = CH4 × VentQuantity × 10.

For example, if CH4 is 2% and the ventilation rate is 5 m3/s, the rate is 2 × 5 × 10 = 100 L/s. This aligns with 0.02 × 5 m3/s = 0.1 m3/s, which is 100 L/s.

Using any multiplier other than 10 would not correctly account for the unit conversions, so the correct form is CH4 × VentQuantity × 10 = L/s.