شبیه سازی مبدل حرارتی در MATLAB
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% This program uses a large database of standards for plate and frame
% heat exchangers, so for any kinds and sizes of heat exchangers it
% calculates the thermo dynamical parameters of heat exchangers.
%
%
% Written By Ahmad Kolahi
%
%--------------------------------------------------------------------
heat=[ 30 0 10 0.718 0.349;
30 10 1e10 0.348 0.663;
45 0 10 0.718 0.349;
45 10 100 0.4 0.598;
45 100 1e10 0.3 0.663;
50 0 20 0.63 0.333;
50 20 300 0.291 0.591;
50 300 1e10 0.13 0.732;
60 0 20 0.562 0.326;
60 20 400 0.306 0.529;
60 400 1e10 0.108 0.703;
65 0 20 0.562 0.326;
65 20 500 0.331 0.503;
65 500 1e10 0.087 0.718];
fric=[ 30 0 10 50 1;
30 10 100 19.4 0.589;
30 100 1e10 2.99 0.183;
45 0 15 47 1;
45 15 300 18.29 0.625;
45 300 1e10 1.441 0.206;
50 0 20 34 1;
50 20 300 11.25 0.631;
50 300 1e10 0.772 0.161;
60 0 40 24 1;
60 40 400 3.24 0.457;
60 400 1e10 0.76 0.215;
65 0 50 24 1;
65 50 500 2.8 0.451;
65 500 1e10 0.639 0.213];
%***hot fluid***'
mhot = 78.24;
thotin = 50;
thotout=19.2;
rohot = 847;
cphot=1900;
%***cold fluid***'
mcold = 86.94;
tcoldin = 15.55;
rocold = 847;
cpcold=1900;
%***Construction Data
ea = 0.85;
p = 0.005; %Plate pitch
s = 0.0006; %Plate Thickness
mu = 1.17; %Enlargement Factor
dport = 8*0.0254; %Port Diameter
w = 0.84; %Effective Channal Wide
lp = 2.18; %Flow Length in one pass
kwall = 20;
pass = 2;
angle = 30;
n=400;
%Mean channal flow area:
b = p - s;
%One channal flow area:
Ax = b * w;
%Channal equvalent diameter:
de = 2 * b / mu;
x = 0;
cphott=cphot+100;
cpcoldt=cpcold+100;
while (abs(cphot - cphott) / cphot > 0.01) & (abs(cpcold - cpcoldt) / cphot > 0.01)
cphot = cphott;
cpcold = cpcoldt;
q = mhot * cphot * abs(thotin - thotout);
tcoldout = q / (mcold * cpcold) + tcoldin;
tmeancold = (tcoldout + tcoldin) / 2;
tmeanhot = (thotout + thotin) / 2;
cphott = (4.2 * tmeanhot + 1805);
cpcoldt = (4.2 * tmeancold + 1805);
end
muhot = (-8.333e-7 * tmeanhot ^ 3 + 0.002775 * tmeanhot ^ 2 - 0.3707 * tmeanhot + 18.25) * 10 ^ -6;
mucold = (-8.333e-7 * tmeancold ^ 3 + 0.002775 * tmeancold ^ 2 - 0.3707 * tmeancold + 18.25) * 10 ^ -6;
khot = (-0.0008 * tmeanhot + 1.4987) * 0.3048 ^ 2;
kcold = (-0.0008 * tmeancold + 1.4987) * 0.3048 ^ 2;
prhot = muhot * cphot / khot;
prcold = mucold * cpcold / kcold;
noplate=n+50;
while abs(n-noplate)>1
n=noplate;
%Number of channals per pass:
Nochannal = (n - 1) / (2 * pass);
%***Heat transfer calculation***'
Mdotchhot = mhot / Nochannal;
Mdotchcold = mcold / Nochannal;
%Mass velocity:
mchhot = Mdotchhot / Ax;
mchcold = Mdotchcold / Ax;
%Reynolds number:
rehot = mchhot * de / muhot;
recold = mchcold * de / mucold;
for Find = 1:14
if (angle == heat(Find, 1)) & (rehot >= heat(Find, 2)) & (rehot <= heat(Find, 3))
Chhot = heat(Find, 4);
yhot = heat(Find, 5);
Jhhot = Chhot * rehot ^ yhot;
end;
if (angle == heat(Find, 1)) & (recold >= heat(Find, 2)) & (recold <= heat(Find, 3))
Chcold = heat(Find, 4);
ycold = heat(Find, 5);
Jhcold = Chcold * recold ^ ycold;
end;
end;
for Find = 1:14
if (angle == fric(Find, 1)) & (rehot >= fric(Find, 2)) & (rehot <= fric(Find, 3))
kphot = fric(Find, 4);
zhot = fric(Find, 5);
fchhot = kphot / rehot ^ zhot;
end;
if (angle == fric(Find, 1)) & (recold >= fric(Find, 2)) & (recold <= fric(Find, 3))
kpcold = fric(Find, 4);
zcold = fric(Find, 5);
fchcold = kpcold / recold ^ zcold;
end;
end
alfahot = Jhhot * khot * prhot ^ 0.33 / de;
alfacold = Jhcold * kcold * prcold ^ 0.33 / de;
rw = s / kwall;
u = (1 / alfahot + 1 / alfacold + rw + 4.5 * 10 ^ -5) ^ -1;
%if (abs(thotin - tcoldout) == abs(tcoldin - thotout))
% dtlm = abs(thotin - tcoldout);
% else
dtlm = ((thotin - tcoldout) - (thotout - tcoldin)) / (log((thotin - tcoldout) / (thotout - tcoldin)) / log(exp(1)));
% end ;
noplate=q/(u*ea*dtlm);
end
lch = pass * lp;
dpchhot = (4 * fchhot * lch * mchhot ^ 2) / (2 * rohot * de);
dpchcold = (4 * fchcold * lch * mchcold ^ 2) / (2 * rocold * de);
mporthot = mhot / (pi / 4 * dport ^ 2);
mportcold = mcold / (pi / 4 * dport ^ 2);
dpphot = (1.3 * mporthot ^ 2) / (2 * rohot) * pass;
dppcold = (1.3 * mportcold ^ 2) / (2 * rocold) * pass;
dphot = dpphot + dpchhot;
dpcold = dppcold + dpchcold;
%tcoldout;
%if (dphot>100000)|(dpcold>100000)
% noplate=100000;
%end
%ff = noplate;
clc
disp('Number of Plates = ');disp(round(noplate*1.2))
disp('U = ');disp(round(u/1059*0.3048^2/1.8*3600))
disp('Temp of Hot in(F) = ');disp(round((thotin*1.8+32)))
disp('Temp of Hot out(F) = ');disp(round(10 * (thotout*1.8+32)) / 10)
disp('Temp of Cold in(F) =');disp(round(10 * (tcoldin*1.8+32)) / 10)
disp('Temp of Cold out(F) =');disp(round(10 * (tcoldout*1.8+32)) / 10)
disp('Hot Pressure Loss(psi)=');disp(round(dphot * 14.7 / 10000)/10)
disp('Cold Pressure Loss(psi)=');disp(round(dpcold * 14.7 / 10000)/10)
disp('dtlm(F) =');disp(round(10 * (dtlm*1.8)) / 10)
disp('Power(Btu/hr) =');disp(3600*round(q / 1059))این چیه گذاشتی؟
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