Airflow Calculation for Baghouse Inlet/Outlet Temp 400F/210F

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SUMMARY

The discussion centers on calculating the actual volume of air in a baghouse system with an inlet temperature of 400°F and an outlet temperature of 210°F, given a measured airflow of 10,500 acfm at the fan discharge. The air densities for process air, inleakage air, and outlet air are specified as 0.0462 lb/ft³, 0.075 lb/ft³, and 0.0593 lb/ft³, respectively. A material and energy balance approach yields 5,720 acfm for process air and 4,780 acfm for inleakage air. The discussion highlights the need for clarity regarding the actual volume being calculated and suggests that including fan power in the energy balance could enhance accuracy.

PREREQUISITES
  • Understanding of thermodynamics principles, particularly energy balance.
  • Familiarity with airflow measurement units, specifically acfm (actual cubic feet per minute).
  • Knowledge of air density calculations and their relevance in thermal systems.
  • Experience with baghouse operation and performance metrics.
NEXT STEPS
  • Research methods for calculating airflow in baghouse systems, focusing on energy balance techniques.
  • Learn about the impact of air density variations on thermal calculations in industrial applications.
  • Study the principles of mixing processes in thermodynamic systems.
  • Explore the role of fan power in energy balances for HVAC and industrial systems.
USEFUL FOR

Engineers, process designers, and environmental specialists involved in air quality management and baghouse system optimization will benefit from this discussion.

DC52
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The inlet temperature of a baghouse under negative pressure is 400 F and the outlet temperature is 210 F. The volume of air is 10,500 acfm. (baghouse is in poor condition). How do I determine the actual volume given this information?
 
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Any significant water present? Is the cooling due only to air infiltration? Is the 10,500 acfm measured at the inlet?
 
It is a dry day, no rain, or mositure in the inlet ductwork. The 10,500 acfm is measured at the fan discharge, which is downstream from the baghouse.
 
I considered a simple mixing process of 400F process air and 70F inleakage air. Process air density = 0.0462 lb/ft3. Inleakage air density = 0.075 lb/ft3. Outlet air density = 0.0593 lb/ft3. All air streams heat capacity = 0.25 Btu/lb-F. A material and energy balance gives two equations and two unknowns. I got 5,720 acfm for the process air and 4,780 acfm for the inleakage air. NOTE: Fan power was not included. If known it can be added to the energy balance.
 
I'm having trouble understanding the question. Actual volume of what? The bag house? The airflow through the bag house? A diagram would help too.
 

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