Calculating Specific Enthalpy of Air at Different Temperatures and Pressures

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SUMMARY

This discussion focuses on calculating the specific enthalpy of air at varying temperatures and pressures, specifically at 200 kPa and 90 kPa. The user inquires about the use of thermodynamic tables, noting a lack of specific data for air at the desired pressures. The consensus is that for small temperature ranges, the specific heat capacity (Cp) can be utilized as an approximation for calculating enthalpy changes in ideal gases.

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  • Understanding of thermodynamic principles, particularly specific enthalpy
  • Familiarity with ideal gas laws and properties
  • Knowledge of specific heat capacity (Cp) and its application
  • Basic skills in interpreting thermodynamic tables
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  • Research the calculation of specific enthalpy using Cp for ideal gases
  • Explore thermodynamic tables specific to air at various pressures
  • Learn about the impact of temperature variations on enthalpy calculations
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Students and professionals in thermodynamics, mechanical engineers, and anyone involved in HVAC systems or energy systems analysis will benefit from this discussion.

JSBeckton
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I'm sure this is a really dumb question, but how do you find the specific enthalopy of air at a given temp and pressure? I Have been using my thermo tables for everything but I do not have tables for air. The only tables for air that I see list the properties at .1 Mpa and I need it at 200, and 90kPa. Do I use Cp?
 
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Enthalpy for Ideal gases are given in your tables as functions of temperature in Kelvin.

You can use cp when the temperature range is small as an approximation.
 
ok, thanks
 

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