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## Main Question or Discussion Point

Hi from Germany,

I would like to calculate the JTC for a concrete example.

From a pressure vessel full (in german we say "Druckbehälter" (db)) with dry air (V

With the following approach I would like to calculate the cooling of the air. The constants a, b and R are known to me.:

What values I have to use for T and c

I think, I have to use the values from the pressure vessel, to calculate the temperature of the air after throttling to atmospheric pressure. Therfore I have to calculate the molar isobaric heat capacity of air c

Am I right ??

Thanks for your help, Mike

I would like to calculate the JTC for a concrete example.

From a pressure vessel full (in german we say "Druckbehälter" (db)) with dry air (V

_{db}=100 m^{3}; p_{db}=300 bar; T_{db}=293,13 K) flows out the air after the valve outside (p_{amb}=1 bar). I suppose that T_{db}and p_{b}in the pressure vessel remain constant.With the following approach I would like to calculate the cooling of the air. The constants a, b and R are known to me.:

What values I have to use for T and c

_{p}?I think, I have to use the values from the pressure vessel, to calculate the temperature of the air after throttling to atmospheric pressure. Therfore I have to calculate the molar isobaric heat capacity of air c

_{p,db}in the pressure vessel (at T_{db}= 293.13 K and p_{db}= 300 bar).Am I right ??

Thanks for your help, Mike