This section is available on request - MAN Diesel & Turbo
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<strong>MAN</strong> B&W <strong>Diesel</strong> A/S 6.04<br />
Calculati<strong>on</strong> of Exhaust Data for Derated Engine<br />
Example 3:<br />
Page 11 of 12<br />
Expected exhaust data for a derated 6S65ME-C with high efficiency turbocharger and with fixed pitch<br />
propeller.<br />
Based <strong>on</strong> the engine ratings below, and by means of an example, th<str<strong>on</strong>g>is</str<strong>on</strong>g> chapter will show how to calculate the<br />
expected exhaust gas amount and temperature at service rating, and for a given ambient reference c<strong>on</strong>diti<strong>on</strong><br />
different from ISO.<br />
The calculati<strong>on</strong> <str<strong>on</strong>g>is</str<strong>on</strong>g> made for the service rating (S) being 80%of the specified MCR power of the diesel engine.<br />
Nominal MCR, (L ) 1 P : 17,220 kW (100%) and 95.0 r/min (100.0%)<br />
L1<br />
Specified MCR, (M) P : 14,637 kW (85.0%) and 92.2 r/min (97.0%)<br />
M<br />
Matching point, (O) P : 13,173 kW (76.5%) and 89.0 r/min (93.7%), P = 90.0% of P O O M<br />
Service rating, (S) P : 11,710 kW and 85.6 r/min, P = 80.0% of P S S M<br />
Reference c<strong>on</strong>diti<strong>on</strong>s<br />
Air temperature T air ........................................ 20° C<br />
Scavenge air coolant temperature T CW ......... 18° C<br />
Barometric pressure p bar ..................... 1,013 mbar<br />
Exhaust gas back-pressure<br />
at specified MCR ∆p M ....................... 300 mm WC<br />
a) Correcti<strong>on</strong> for choice of specified MCR point M<br />
and matching point O:<br />
14,637<br />
P = x 100 = 85.0%<br />
M% 17,220<br />
92.2<br />
n = x 100 = 97.0%<br />
M% 95.0<br />
By means of Figs. 6.04.07 and 6.04.08:<br />
∆m = -1.5 %<br />
M%<br />
∆T = -3.8° C<br />
M<br />
As the engine <str<strong>on</strong>g>is</str<strong>on</strong>g> matched in O lower than 100% M,<br />
and P O% = 90.0% of P M<br />
we get by means of equati<strong>on</strong> [6]<br />
∆T O<br />
= - 0.3 x (100 - 90.0) = - 3.0° C<br />
b) Correcti<strong>on</strong> for ambient c<strong>on</strong>diti<strong>on</strong>s and backpressure:<br />
By means of equati<strong>on</strong>s [7] and [8]:<br />
∆M amb% = - 0.41 x (20 - 25) + 0.03 x (1,013 - 1,000)<br />
+ 0.19 x (18 - 25) - 0.011 x (300 - 300) %<br />
∆M amb% = + 1.11%<br />
S65ME-C 198 48 28-5.1<br />
∆T amb<br />
∆T amb<br />
= 1.6 x (20 - 25) - 0.01 x (1,013 - 1,000)<br />
+ 0.1 x (18 - 25) + 0.05 x (300 - 300) °C<br />
= - 8.8° C<br />
c) Correcti<strong>on</strong> for the engine load:<br />
Service rating = 80% of specified MCR power<br />
By means of Figs. 6.04.11 and 6.04.12:<br />
∆m S%<br />
∆T S<br />
= + 5.6%<br />
= - 11.7 °C
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