Page 496 - Design and Operation of Heat Exchangers and their Networks

Appendix 479

for i=1:1: nx1
t2(2, i, 1) = t2(3, i, ny1);
end
n=n+ 1;
fprintf("%d, %e\n", n, smax);
end
fprintf("smax =%e, thm =%f, 1-thm =%f, tcm =%f\n", ...
smax, thm, 1-thm, tcm);

case-15 % BA_1,5
% analytical
nu_1 = special_function_nu_(aA, bA);
nu_2 = special_function_nu_(aB, bB);
K1 = special_function_K(bA);
K2 = special_function_K(bB);
epsilon_h = 1 - nu_1 ∗ nu_2 / (1 - bB ∗ K1 ∗ K2 ...
∗ (1 - nu_1 ∗ nu_2) / (K1 + phi ∗ K2));
% numerical
t1(:, :, :) = 1;
t2(:, :, :) = 0;
smax = 100;
n=0;
while (abs(smax) > eps && n < 100)
smax = 0;
ntuh = NTUh(1);
ntuc = NTUc(1);
th(:, :) = t1(1, :, :);
tc(:, :) = t2(1, :, :);

[th, tc, thm, tcm] = crossflow_mixed_unmixed ...
(ntuh, ntuc, nx, ny, th, tc, A, T, D);
for i =1:1:nx1
for j=1:1: ny1
s = th(i, j) - t1(1, i, j);
if (abs(s) > abs(smax))
smax = s;
end
t1(1, i, j) = t1(1, i, j) + e ∗ s;