Page 521 - Design and Operation of Heat Exchangers and their Networks

504 Appendix

ntuh = NTUh(1);
ntuc = NTUc(1);
[th, tc, thm, tcm] = crossflow_unmixed_unmixed ...
(ntuh, ntuc, nx, ny, th, tc);
fprintf("thm_i =%f, tcm_i =%f\n", thm, tcm);

ntuh = NTUh(2);
ntuc = NTUc(2);
th(:, :) = thm;
for i=1 :1:nx1
tc(i, 1) = tc(i, ny1);
end
[th, tc, thm, tcm] = crossflow_mixed_unmixed ...
(ntuh, ntuc, nx, ny, th, tc, A, T, D);
fprintf("thm =%f, tcm =%f, 1-thm =%f, e_h =%f\n", ...
thm, tcm, 1 - thm, epsilon_h);

case 45
% analytical
nu1 = special_function_nu(aA, bA);
mua = special_function_mu(aA, bA);
epsilon_h = nu1 ∗ (1 - nu1) + mua;
% numerical
th(:, :) = 1;
tc(:, :) = 0;
ntuh = NTUh(1);
ntuc = NTUc(1);
[th, tc, thm, tcm] = crossflow_unmixed_unmixed ...
(ntuh, ntuc, nx, ny, th, tc);
fprintf("thm_i =%f, tcm_i =%f\n", thm, tcm);

ntuh = NTUh(2);
ntuc = NTUc(2);
th(:, :) = thm;
for i=1 :1:nx1
tc(i, 1) = tc(nx1 -i+1, ny1);
end
[th, tc, thm, tcm] = crossflow_unmixed_unmixed ...
(ntuh, ntuc, nx, ny, th, tc);