This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>MAN</strong> B&W <strong>Diesel</strong> A/S 6.04<br />
Calculati<strong>on</strong> of Freshwater Producti<strong>on</strong> for Derated Engine<br />
Example 2:<br />
Page 7 of 12<br />
Freshwater producti<strong>on</strong> from a derated 6S65ME-C with high efficiency <strong>MAN</strong> B&W turbocharger of TCA type<br />
and with fixed pitch propeller.<br />
Based <strong>on</strong> the engine ratings below, th<str<strong>on</strong>g>is</str<strong>on</strong>g> example will show how to calculate the expected <str<strong>on</strong>g>available</str<strong>on</strong>g> jacket<br />
cooling water heat removed from the diesel engine, together with the corresp<strong>on</strong>ding freshwater producti<strong>on</strong><br />
from a freshwater generator.<br />
The calculati<strong>on</strong> <str<strong>on</strong>g>is</str<strong>on</strong>g> made for the service rating (S) of the diesel engine being 80% of the specified MCR.<br />
Nominal MCR, (L ) P : 17,220 kW (100.0%) and 95.0 r/min (100.0%)<br />
1 L1<br />
Specified MCR, (M) P M : 14,637 kW (85.0%) and 92.2 r/min (97.0%)<br />
Matching point, (O) P O : 13,173 kW (76.5%) and 89.0 r/min (93.7%), P O = 90.0% of P M<br />
Service rating, (S) P S : 11,710 kW and 85.6 r/min, P S = 80.0% of P M and P S = 88.9% of P O<br />
Ambient reference c<strong>on</strong>diti<strong>on</strong>s: 20° C air and 18° C cooling water.<br />
The expected <str<strong>on</strong>g>available</str<strong>on</strong>g> jacket cooling water heat at<br />
service rating <str<strong>on</strong>g>is</str<strong>on</strong>g> found as follows:<br />
Q = 2,490 kW from L<str<strong>on</strong>g>is</str<strong>on</strong>g>t of Capacities<br />
jw,L1<br />
Q = 81.0% using 76.5% power and 93.7%<br />
jw%<br />
speed for O in Fig. 6.04.02<br />
By means of equati<strong>on</strong> [1], and using factor 0.88 for<br />
actual ambient c<strong>on</strong>diti<strong>on</strong> the heat d<str<strong>on</strong>g>is</str<strong>on</strong>g>sipati<strong>on</strong> in the<br />
matching point (O) <str<strong>on</strong>g>is</str<strong>on</strong>g> found:<br />
Qjw,O =Q x jw,L1 100<br />
x 0.88<br />
= 2,490 x<br />
81.0<br />
x 0.88 = 1,775 kW<br />
100<br />
By means of equati<strong>on</strong> [2], the heat d<str<strong>on</strong>g>is</str<strong>on</strong>g>sipati<strong>on</strong> in the<br />
service point (S) i.e. for 88.9% of matching power,<br />
<str<strong>on</strong>g>is</str<strong>on</strong>g> found:<br />
kp Qjw Q jw%<br />
= 0.918 using 88.9% in Fig. 6.05.04<br />
=Q x k = 1,775 x 0.918 = 1,630 kW<br />
jw,O p<br />
-15%/0%<br />
For the service point the corresp<strong>on</strong>ding expected<br />
obtainable freshwater producti<strong>on</strong> from a freshwater<br />
generator of the single´effect vacuum evaporator<br />
type <str<strong>on</strong>g>is</str<strong>on</strong>g> then found from equati<strong>on</strong> [3]:<br />
S65ME-C 198 48 27-3.1<br />
M fw<br />
= 0.03 x Q = 0.03 x 1,630 = 48.9 t/24h<br />
jw<br />
-15%/0%
Change language