Thermodynamics is air ducts, dew point

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SUMMARY

The discussion centers on the behavior of air flow in air conditioning ducts, specifically whether it operates under constant volume or constant pressure conditions. Participants confirm that, despite a small pressure differential caused by the fan, the air flow can be approximated as constant pressure. This approximation is crucial for accurately determining the dew point of the air within the duct system. The consensus emphasizes the importance of understanding these thermodynamic principles for effective HVAC design.

PREREQUISITES
  • Basic understanding of thermodynamics principles
  • Familiarity with HVAC systems and air flow dynamics
  • Knowledge of dew point calculations
  • Experience with pressure differentials in fluid mechanics
NEXT STEPS
  • Research the principles of constant pressure vs. constant volume in thermodynamics
  • Study dew point calculation methods in HVAC applications
  • Explore the impact of pressure differentials on air flow in ducts
  • Learn about HVAC system design considerations for optimal air flow
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HVAC engineers, thermodynamics students, and professionals involved in air conditioning system design and optimization.

rolan91602
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Can anyone confirm if the flow of air inside an air conditioning duct, when cooled, behaves as constant volume as compared to constant pressure? I am trying to determine the dew point of the flow and, depending of how it behaves inside the duct, this value will depend on if it is at constant voulume or constant pressure. I think it is at constant volume. Please confirm.
 
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The duct is open on both ends. There is going to be a small pressure differential due to the fan, required to move the air, but it's going to be almost insignificant. To a good approximation, you can assume constant pressure.
 
Thank you.
 

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