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High pressure gases specific heat

  1. Nov 23, 2008 #1
    I want to calculate the reaction heat in a ammonia convertor but I need some
    specific heats of N2,NH3,Ar and CH4 at 500°C and 200bar. I could find data at 500°C but not at that pressure.

    thanks Stefaan
  2. jcsd
  3. Nov 23, 2008 #2


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    Hi Stefaan,
    I was going to suggest the NIST web site but I see they don't go up that high in pressure for ammonia at least.

    Values below are in Btu/lbm-F.

    Fluid / Cv / Cp
    Nitrogen / .1977 / .2738
    Ammonia / .6080 / .7906
    Argon / .07550 / .1314
    CH4 / .8018 / .9490
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