The mass flow rate of flue gas in a 1 2 m by 2 m rectangular duct is to be measured using a thermal meter The normal gas composition is 76 percent N 2 3 percent O 2 14 percent CO 2 , and 7 percent H 2 O and the average velocity is 12 m s at duct conditions of 150C and 1 atm (a) If a 5,000 W heating...

To solve this problem we can use the principles of heat transfer and mass flow rate measurement using a thermal meter Well start by calculating the te ...

The mass flow rate of flue gas in a 1.2-m by 2-m rectangular duct is to be

Question:

The mass flow rate of flue gas in a 1.2-m by 2-m rectangular duct is to be measured using a thermal meter. The normal gas composition is 76 percent N₂. 3 percent O₂. 14 percent CO₂, and 7 percent H₂O; and the average velocity is 12 m/s at duct conditions of 150°C and 1 atm.

(a) If a 5,000-W heating element is centrally mounted in the duct, what is the temperature rise after the heated gas has mixed with the rest of the gas? What is the accuracy of the flow measurement if the upstream and downstream-temperatures can be determined to ±0.01°C?

(b) If the meter is calibrated for the normal gas composition, what is the effect of a change to 12 percent CO₂?

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