ideal-gas specific heats of various common gases function of temperature
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I know that the static pressure specific heat of air, an ideal gas, is 1.005, but in the one I made, it comes out to be 1.0002. What went wrong?
clc; clear all; close all;
M = 28.96;
T = 273.15;
a=28.11; b=0.1967E-2; c=0.4802E-5; d=-1.966E-9;
dcp=(a+(b.*T)+(c.*(T.^2))+(d.*(T.^3)));
cp = dcp./M;
disp(cp);
4 Comments
Dyuman Joshi
on 3 Apr 2024 at 17:24
Edited: Dyuman Joshi
on 3 Apr 2024 at 17:28
Unfortunately, NIST has not published any data regarding Shomate polynomials of Air (If I had to guess why - I would say it is probably because air is a mixture of different elements and compounds, thus it woud be difficult to obtain data for it).
I could only find the values for N2, O2, H2, H2O and CH4.
Accepted Answer
VBBV
on 2 Apr 2024 at 6:26
Edited: VBBV
on 2 Apr 2024 at 14:35
M = 28.9; % assune
T = 273.15;
a=28.11; b=0.1967E-2; c=0.4802E-5; d=-1.966E-9;
dcp=(a+(b.*T)+(c.*(T.^2))-(d.*(T.^3)));
%changge in sign here
cp = dcp./M;
disp(cp);
2 Comments
Dyuman Joshi
on 21 Apr 2024 at 12:33
Although @Angelo Yeo has accepted this answer, I do not think this is a right approach to solving this problem.
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