Troubleshooting Nitrogen Gas Storage: Pressure Estimation Methods

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SUMMARY

The discussion centers on estimating the pressure of nitrogen gas stored in a 500-L tank at 150 K using three methods: Nitrogen Tables, Ideal Gas assumption, and Generalized compressibility chart. The user reports difficulties in obtaining reasonable pressure values, particularly with the Nitrogen Tables and Ideal Gas equation, which yield excessively high pressures. The Generalized compressibility chart also fails to provide matching results for the calculated reduced temperature (Tr) and reduced volume (Vr). Comparatively, the user had success with R-134a, indicating unique challenges with nitrogen gas calculations.

PREREQUISITES
  • Understanding of the Ideal Gas Law and its applications
  • Familiarity with Nitrogen Tables for gas properties
  • Knowledge of Generalized compressibility charts
  • Basic thermodynamics principles related to gas behavior
NEXT STEPS
  • Research the specific properties of nitrogen gas using updated Nitrogen Tables
  • Study the Ideal Gas Law in relation to real gas behavior
  • Explore advanced techniques for using Generalized compressibility charts
  • Investigate the differences in behavior between nitrogen and refrigerants like R-134a
USEFUL FOR

Engineers, chemists, and students involved in gas storage design, particularly those working with nitrogen and other gases requiring pressure estimation methods.

kaeser1
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Hey guys, I have been having a really hard time trying to figure out this question. It seems like everything I do, I can not get resonable answers. If you can help me, that would be great.

Problem: A 500-L tank stores 100kg of nitrogen gas at 150 degrees K. To design the tank, the pressure must be estimated and three different methods are suggested:
a) Nitrogen Tables
b) Ideal Gas assumption
c) Generalized compressibility chart
 
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So what's your question?
 
I can't get the pressure by using any of the Nitrogen tables for an ideal gas. They seem not to have enough information on them to find pressure. When I use the ideal gas equation, the pressure comes out to be really really high, and when I find Tr and Vr for the compressability chart, nothing matches up. I did not have this problem when I used R-134a for a similar question. Everything went smooth for that gas, but it seems like you can't solve this question for nitrogen.
 

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