How to make output of first input as new input to the second pipe, if n numbers of pipes are connected in parallel?

% How to make output of first input as new input to the second pipe, if n numbers of pipes are connected in parallel?

% Here c_p is also function of fluid inlet temperature (T_fi)

clc

clear

close all

L_step = 0 : 0.1 : 1;

T_fi = 305;

T_a = 300;

F_r = 0.92;

A_c = 2;

S = 900;

U_l = 4.5;

m_w = 0.01;

c_p = zeros(length(T_fi),1);

Q_u = zeros(1,length(L_step));

T_step = zeros(1,length(L_step));

T_step(1) = T_fi;

Q_u(1) = F_r*A_c*(S - U_l*(T_fi - T_a));

[c_p(i)] = refpropm('C', 'T', T_fi(i), 'P', 9e3, 'CO2');

for i = 1 : (length(L_step)-1)

[c_p(i+1)] = refpropm('C', 'T', T_fi, 'P', 9e3, 'CO2');

T_step(i+1) = (Q_u(i)/(m_w*c_p(i))) + T_step(i);

T_wo(i) = (Q_u(i)/(m_w*c_p(i))) + T_fi(i);

end

[Karanjot]

Hi Wasim,

I understand that you want to utilise use the output of the first pipe as an input to another pipe connected in parallel.

In the code given below, I added an additional array T_wo to store the outlet temperatures of each pipe. The output of the previous pipe (T_step(i)) is assigned as the new input (T_fi(i+1)) for the next pipe in the loop. This way, the output of the first input becomes the new input for the second pipe, and so on for n numbers of pipes connected in parallel.

L_step = 0 : 0.1 : 1;
T_fi = 305;
T_a = 300;
F_r = 0.92;
A_c = 2;
S = 900;
U_l = 4.5;
m_w = 0.01;
c_p = zeros(length(T_fi),1);
Q_u = zeros(1,length(L_step));
T_step = zeros(1,length(L_step));
T_wo = zeros(1,length(L_step));

T_step(1) = T_fi;
Q_u(1) = F_r*A_c*(S - U_l*(T_fi - T_a));
[c_p(1)] = refpropm('C', 'T', T_fi(1), 'P', 9e3, 'CO2'); % Initialise 1st index instead of i

for i = 1 : (length(L_step)-1)
    [c_p(i)] = refpropm('C', 'T', T_fi(i), 'P', 9e3, 'CO2');
    T_step(i+1) = (Q_u(i)/(m_w*c_p(i))) + T_step(i);
    T_wo(i) = (Q_u(i)/(m_w*c_p(i))) + T_fi(i);
    T_fi(i+1) = T_step(i+1);  % Set the output of the previous pipe as the new input
end

I hope this helps!

Regards,

Karanjot Singh