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
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<strong>MAN</strong> B&W 6.04<br />
Calculati<strong>on</strong> of Freshwater Producti<strong>on</strong> for Derated Engine<br />
Example 2:<br />
<strong>MAN</strong> B&W S65ME-C8-GI-TII<br />
<strong>MAN</strong> <strong>Diesel</strong><br />
Page 7 of 12<br />
Freshwater producti<strong>on</strong> from a derated 6S65ME-C8-GI-TII with high efficiency <strong>MAN</strong> <strong>Diesel</strong> turbocharger<br />
type TCA and 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 1 ) P L1 : 17,220 kW (100.0%) and 95.0 r/min (100.0%)<br />
Specified MCR, (M) P M : 14,637 kW (85.0%) and 85.5 r/min (90.0%)<br />
Matching point, (O) P O : 14,637 kW (85.0%) and 85.5 r/min (90.0%), P O = 100.0% of P M<br />
Service rating, (S) P S : 11,710 kW and 79.4 r/min, P S = 80.0% of P M and P S = 80.0% 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<br />
at service rating <str<strong>on</strong>g>is</str<strong>on</strong>g> found as follows:<br />
Q jw,L1 = 2,490 kW from L<str<strong>on</strong>g>is</str<strong>on</strong>g>t of Capacities<br />
Q jw% = 88.5% using 85.0% power and 90.0%<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<br />
the matching point (O) <str<strong>on</strong>g>is</str<strong>on</strong>g> found:<br />
Q = Q x jw,O jw,L1 Q ___ jw%<br />
100<br />
= 2,490 x 88.5 ___<br />
100<br />
x 0.88<br />
x 0.88 = 1,939 kW<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<br />
the service point (S) i.e. for 88.9% of matching<br />
power, <str<strong>on</strong>g>is</str<strong>on</strong>g> found:<br />
kp Qjw = 0.852 using 80.0% in Fig. 6.04.04<br />
= Q x k = 1,939 x 0.852 = 1,652 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 />
M fw = 0.03 x Q jw = 0.03 x 1,652 = 49.6 t/24h<br />
�15%/0%<br />
198 74 51-3.0
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