Project 1 - Parsing NASA thermodynamic data

Aim: To write a code to parse the thermodynamic data file provided and then calculate the thermodynamic properties of various gas species

Objective:

1)Write a function that extracts the 14 co-efficients and calculates the enthalpy, entropy and specific heats for all the species in the data file.

2. Calculate the molecular weight of each species.

3. Plot the Cp, Enthalpy and Entropy for the local temperature range

4. Save the plots as images with appropriate names and dump them in separate folders for each species with suitable name.

Theory:

File parsing is a string or symbol either in a natural language,computer language conferning to the rules of former grammer

Mathematical equations:

For specific heat

For enthalpy

For entropy

Where

T=Local temperature

b1-b7 =High temperature coefficient

b8-b14=low temperature coefficient

R=Gas constant =8.314

Program:

The Program for File parsing is as follows

%NASA thermodynamic data file parsing
clear all
close all
clc

%universal gas constant

R=8.314;


%reader header information

f1=fopen('THERMO.dat','r');
tline1=fgetl(f1);
tline2=fgetl(f1);
temp=strsplit(tline2,' ');
global_low_temp=str2num(temp{2});
global_mid_temp=str2num(temp{3});
global_high_temp=str2num(temp{4});

%skipping next three lines

for i=3
    skippedlines=fgetl(f1);
end
    for i=1:53
    tline3=fgetl(f1)
    S=strsplit(tline3,' ');
    species_name=S{1};
    A=strfind(tline3,'G');
    temp_values=tline3(A+4:length(tline3));
    B=strsplit(temp_values,' ');
local_low_temp=str2double(B{1});
local_mid_temp=str2double(B{3});
local_high_temp=str2double(B{2});

tline4=fgetl(f1);
f=strfind(tline4,'E');
a1=str2double(tline4(1:(f(1)+3)));
a2=str2double(tline4(f(1)+4:f(2)+3));
a2=str2double(tline4(f(2)+4:f(3)+3));
a2=str2double(tline4(f(3)+4:f(4)+3));
a2=str2double(tline4(f(4)+4:f(5)+3));

tline5=fgetl(f1);
a6=str2double(tline5(1:(f(1)+3)));
a7=str2double(tline5(f(1)+4:f(2)+3));
a8=str2double(tline5(f(2)+4:f(3)+3));
a9=str2double(tline5(f(3)+4:f(4)+3));
a10=str2double(tline5(f(4)+4:f(5)+3));

tline6=fgetl(f1);
a11=str2double(tline6(1:(f(1)+3)));
a12=str2double(tline6(f(1)+4:f(2)+3));
a13=str2double(tline6(f(2)+4:f(3)+3));
a14=str2double(tline6(f(3)+4:f(4)+3));


t=linspace(local_low_temp,local_high_temp,100)

%to calculate specific heat using function

C_p=R*specific_heat_cal(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,local_low_temp,local_mid_temp,local_high_temp,T,R);
s=R*entropy_cal(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,local_low_temp,local_mid_temp,local_high_temp,T,R);
h=R*enthalpy_cal(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,local_low_temp,local_mid_temp,local_high_temp,T,R);

%Creating a folder

mkdir(['G:',species_name])
cd(species_name)

%Plotting for

%temperature vs specific heat

figure(1)
plot(t,c_p)
xlabel('temperature')
ylabel('specific heat')
title('temperature vs specific heat')
image=getframe(gcf);
imwrite(image.cdata,'t vs cp.png')
saveas(1,'specific heat','jpg')

%temperature vs enthalpy

figure(2)
plot(t,H)
xlabel('temperature')
ylabel('enthalpy')
title('temperature vs enthalpy')
image=getframe(gcf);
imwrite(image.cdata,'t vs H.png')
saveas(2,'enthalpy','jpg')


%temperature vs entropy

figure(3)
plot(t,S)
xlabel('temperature')
ylabel('entropy')
title('temperature vs entropy')
image=getframe(gcf);
imwrite(image.cdata,'t vs S.png')
saveas(2,'entropy','jpg')

cd..
%calculating molecular mass

[M]=molecular_wt(species_name);
K=sprintf('%s mol_wt=%f',species_name,M);
disp(K)
    end

specific heat function code

Function[C_p]=specific_heat_cal(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,local_low_temp,local_mid_temp,local_high_temp,T,R);

if (T>local_mid_temp)
    C_p=(a1+(a2*t)+(a3*(t.^2))+(a4*(t.^3))+(a5*(t.^4)));
else
C_p=(a8+(a9*t)+(a10*(t.^2))+(a11*(t.^3))+(a12*(t.^4)))
end

Enthalpy function code

Function[H]=enthalpy_cal(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,local_low_temp,local_mid_temp,local_high_temp,T,R);
if (T>local_mid_temp)
    H=(a1*t+(a2*(t.^2)/2)+(a3*(t.^3)/3)+(a4*(t.^4)/4)+(a5*(t.^5)/5)+a6);
else
H=(a8*t+(a9*(t.^2)/2)+(a10*(t.^3)/3)+(a11*(t.^4)/4)+(a12*(t.^5)/5)+a13);
end

Entropy Function code

Function[S]=entropy_cal(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,local_low_temp,local_mid_temp,local_high_temp,T,R);
if (T>local_mid_temp)
    S=(a1*log(t)+(a2*t)+(a3*(t.^2)/2)+(a4*(t.^3)/3)+(a5*(t.^4)/4)+a7);
else
S=(a8*log(t)+(a9*t)+(a10*(t.^2)/2)+(a11*(t.^3)/3)+(a12*(t.^4)/4)+a14);
end

Plots:

Plots we got from element O2

Plots we got from element N2

plots we got from CO2 Element

Molecular weight of O2=31.9980

Molecular weight of N2=28.0140

Molecular weight of CO2=44.0090

Folders:

Issues faced during the challenge:

during the challenge i faced issue in understanding in the concept and i had a one on one session with support engineer and i am very clear with the concept