T_in = 270;
h_i = 1000;
h_o = 500;
T_sw = 4;
R_1 = .2;
R_2 = .3;
R_3 = .1;
R_12 = (R_1 + R_2);
R_total = (R_1 + R_2 + R_3);
cp = 2000; m = 40; L = 1000;
for z=0 : L
q_in = m * cp * T_in; q_rad = (T_in - T_sw) / (R_total); q_new = q_in - q_rad; T_ip = T_in - (q_rad * R_1); T_op = T_in - (q_rad * R_12); T_new = (q_new) / (m * cp); T_in = T_new;
end
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