I0N34a THERMODYNAMICA Oefenzitting 4 - bio-ingenieur - home
I0N34a THERMODYNAMICA Oefenzitting 4 - bio-ingenieur - home
I0N34a THERMODYNAMICA Oefenzitting 4 - bio-ingenieur - home
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<strong>I0N34a</strong> Thermodynamica 2 de studiefase <strong>bio</strong>-<strong>ingenieur</strong>swetenschappen<br />
P 0,65 MPa<br />
4<br />
T 360 K<br />
4<br />
<br />
S 4 2, 26 kJ / kgK<br />
<br />
H 4 660 kJ / kg<br />
c) Energiebalans – steady state<br />
dU<br />
dt<br />
<br />
0 W M in(<br />
H 4 H 3)<br />
<br />
<br />
W <br />
T <br />
43 <br />
H H 780 660 120 kJ / kg<br />
M in<br />
3MW 3000kW 3000<br />
kJ / s<br />
3000 kJ / s<br />
isobutaan M 25 kg / s<br />
120 kJ / kg<br />
e) Compressor : Q=0 (adiabatische omkeerbare compressie)<br />
W <br />
H 2H1 (290 275) kJ / kg 15<br />
kJ / kg<br />
M<br />
<br />
in<br />
W (15 kJ / kg)*(25 kg / s) 375<br />
kJ / s<br />
P<br />
Turbine : adiabatische omkeerbare expansie : -WT/Min =120 kJ/kg<br />
Condensatievat : isobare warmteafgifte<br />
Q<br />
M<br />
C<br />
in<br />
Boiler :<br />
Q<br />
M<br />
<br />
B<br />
in<br />
<br />
H 1H4 (275 660) kJ / kg 385<br />
kJ / kg<br />
<br />
H 3H2 (780 290) kJ / kg 490 kJ / kg<br />
Q 490 kJ / kg *25 kg / s 12,3<br />
MJ / s<br />
B<br />
f) Efficiëntie :<br />
netto arbeid uit 3000 375<br />
kJ / s<br />
0,213 of 21,3%<br />
warmte in boiler 12,3*1000 kJ / s<br />
<strong>Oefenzitting</strong> 4 - Oplossingen 2/4