Constant calorific value problem

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SUMMARY

The discussion centers on maintaining a constant calorific value when mixing air and methane. The user seeks a simplified formula to determine the necessary volume of methane to add based on varying volumes of air, specifically for a Delphi visualization program. The key takeaway is that maintaining the same mole fractions of the gases is essential for achieving the desired calorific value in kilojoules per kilogram (KJ/kg). A straightforward equation is required to facilitate this calculation.

PREREQUISITES
  • Understanding of calorific value and its significance in gas mixtures
  • Basic knowledge of gas laws and mole fractions
  • Familiarity with Delphi programming for visualization purposes
  • Concept of volumetric flow rates in gas mixtures
NEXT STEPS
  • Research the calculation of calorific value for gas mixtures
  • Learn about the ideal gas law and its application in gas volume calculations
  • Explore Delphi programming techniques for creating visualization tools
  • Study the concept of mole fraction and its role in chemical mixtures
USEFUL FOR

This discussion is beneficial for chemical engineers, Delphi developers, and anyone involved in gas mixture calculations or energy content analysis.

pomocnik89
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Hello, I've got this problem:

Imagine I mix 2 gases - air + methane (e.g.) and I can change/control quantity/volume of each gas. So if I change the volume of air how much methane should I add to keep a constant calorific value KJ/kg? So for example if I add 200 litres of air I need to know how much methane to add to have a constant calorific value, and then if I add only 150 then how much gas i need to add etc.

Hope I explained my problem ... Just some simplified formula/equation would be ok. I need it for my Delphi vizualization program, so it hasn't to be "physicaly 100% correct" :-) Thank you very very much for your help !
 
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pomocnik89 said:
Hello, I've got this problem:

Imagine I mix 2 gases - air + methane (e.g.) and I can change/control quantity/volume of each gas. So if I change the volume of air how much methane should I add to keep a constant calorific value KJ/kg? So for example if I add 200 litres of air I need to know how much methane to add to have a constant calorific value, and then if I add only 150 then how much gas i need to add etc.

Hope I explained my problem ... Just some simplified formula/equation would be ok. I need it for my Delphi vizualization program, so it hasn't to be "physicaly 100% correct" :-) Thank you very very much for your help !
You need to maintain the same mole fractions.
 

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