Why Pure Nitrogen System Evacuates Faster in 500 Microns Vacuum

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SUMMARY

The discussion centers on the efficiency of evacuating two closed systems to 500 microns vacuum, one filled with pure nitrogen and the other with an atmospheric mix of gases. The pure nitrogen system evacuates faster due to its lower density and lack of moisture, which reduces the workload on the vacuum pump. The presence of water vapor in the atmospheric mix can lead to condensation and freezing, complicating the evacuation process. Understanding gas behavior and the impact of moisture is crucial for optimizing vacuum systems.

PREREQUISITES
  • Understanding of gas behavior in HVAC systems
  • Knowledge of vacuum pump operation and specifications
  • Familiarity with the concept of pressure measurements in microns
  • Basic principles of thermodynamics related to gas mixtures
NEXT STEPS
  • Research the principles of gas behavior in vacuum systems
  • Study the performance characteristics of different vacuum pumps
  • Learn about the effects of moisture on gas evacuation processes
  • Explore the thermodynamic properties of nitrogen and other gases
USEFUL FOR

HVAC technicians, engineers involved in vacuum system design, and anyone interested in optimizing gas evacuation processes in closed systems.

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Homework Statement



Two closed systems of the same size, temperature, and pressure. One is filled with pure nitrogen the other an atmospheric mix (nitrogen/oxygen/etc...throw in some moisture).

I want to evacuate both systems to 500 microns using equally sized vacuum pumps. Why will the pure nitrogen system evacuate quicker?


Homework Equations





The Attempt at a Solution



My HVAC courses lightly touched on gas behavior. This scenario peaked my interest so I am seeking any explanation or direction to educational resources.

My uneducated guess is that it has to do with the densities equating to more or less work required of the vacuum pump thus change in time.
 
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Water could be interesting: evacuation will cool the air, so water could condensate at the walls (depends on the temperature/pressure curve and the initial humidity). After a while, it will freeze (and slowly sublimate), with a possible boiling step in between.
Nitrogen and oxygen are quite similar, and argon should not be an issue. CO2... depends on the temperature.
 

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