LIFETIME Final Presentation - Laboratory of Marine Engineering
LIFETIME Final Presentation - Laboratory of Marine Engineering
LIFETIME Final Presentation - Laboratory of Marine Engineering
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60<br />
Model-based vs. correlational methods <strong>of</strong> NOx estimation<br />
60<br />
MAN B&W<br />
NTUA<br />
MAN B&W<br />
NTUA<br />
Calculatio n E rro r (% )<br />
40<br />
20<br />
40<br />
Load 75% Load 50%<br />
Calculation E rror (% )<br />
20<br />
(*)<br />
0<br />
T02030<br />
(Pmax=161.5bar,<br />
Pcomp=136.7)<br />
T02031<br />
(Pmax=149.4bar,<br />
Pcomp=135.7)<br />
T02032<br />
(Pmax=136.2.5bar,<br />
Pcomp=135.9)<br />
T02033<br />
(Pmax=161.9bar,<br />
Pcomp=127.1)<br />
T02036<br />
(Pmax=159.8bar,<br />
Pcomp=115.4)<br />
0<br />
T02040<br />
(Pmax=105bar,<br />
Pcomp=85)<br />
T02041<br />
(Pmax=95bar,<br />
Pcomp=85)<br />
T02042<br />
(Pmax=85bar,<br />
Pcomp=85)<br />
T02043<br />
(Pmax=105bar,<br />
Pcomp=75)<br />
T02046<br />
(Pmax=105bar,<br />
Pcomp=65)<br />
• Maximum error below 20%<br />
Calculation error <strong>of</strong> the two<br />
methods<br />
• Minimal error in tests with high maximum pressure<br />
• The MAN B&W function provides better calculations in the 75% load. The NTUA model-based method<br />
provides better calculations in the 50% load.<br />
• Brake power calculation accuracy estimated using the MOTHER code is a valid criterion toward accurate<br />
NOx emissions prediction<br />
Athens, October 8, 2003<br />
<strong>Final</strong> <strong>Presentation</strong>
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