Page 505 - Design and Operation of Heat Exchangers and their Networks

488 Appendix

fprintf("smax =%e, thm =%f, tcm =%f, 1-thm =%f, e_h =%f\n", ...
smax, thm, tcm, 1 - thm, epsilon_h);

case-36 % BA_3,6
% analytical
nu2 = special_function_nu(aB, bB);
nu_1 = special_function_nu_(aA, bA);
K1 = special_function_K(bA);
h4 = special_function_h(bB, aB, - K1 / phi);
epsilon_h =1-nu2 ∗ nu_1 / (nu_1 - h4);

% 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, ] = 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;
s = tc(i, j) - t2(1, i, j);
if (abs(s) > abs(smax))
smax = s;
end
t2(1, i, j) = t2(1, i, j) + e ∗ s;
end
end
t1(2, 1, :) = thm;