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MAN B&W Diesel A/S 6.04
Auxiliary Machinery Capacities
The dimensioning of heat exchangers (coolers) and
pumps for derated engines can be calculated on
the bas<strong>is</strong> of the heat d<strong>is</strong>sipation values found by
using the following description and diagrams. Those
for the nominal MCR (L 1 ), may also be used if
wanted.
The nomenclature of the basic engine rratings and
coolers, etc. used in th<strong>is</strong> <strong>section</strong> <strong>is</strong> shown in Fig.
6.01.01 and 6.01.02.
Cooler heat d<strong>is</strong>sipations
For the specified MCR (M) the following three diagrams
in Figs. 6.04.01, 6.04.02 and 6.04.03 show reduction
factors for the corresponding heat d<strong>is</strong>sipations for the
coolers, relative to the values stated in the ‘L<strong>is</strong>t of Capacities’
valid for nominal MCR (L 1 ).
L 3
L 4
Q air%
Q air% = 100 x (P M /P L1 ) 1.68 x (n M /n L1 ) – 0.83 x k O
k O = 1 + 0.27 x (1 – P O /P M )
Specified MCR power, % of L 1
65%
178 51 00-9.0
Fig. 6.04.01: Scavenge air cooler, heat d<strong>is</strong>sipation Q air% in
point M, in % of the L 1 value Q air, L1 and valid for P O = P M .
If matching point O lower than M, an extra correction k O
<strong>is</strong> used
P M%
110%
100%
90%
80%
70%
60%
80% 85% 90% 95% 100% 105% 110% nM% M
L1 100%
90%
80%
70%
L2 Specified MCR engine speed, % of L 1
Page 1 of 12
The percentage power (P M% ) and speed (n M% ) of L 1
ie: P M% = P M /P L1 x 100%
n M% = n M /n L1 x 100%
for specified MCR (M) of the derated engine <strong>is</strong> used
as input in the above-mentioned diagrams, giving
the % heat d<strong>is</strong>sipation figures relative to those in
the ‘L<strong>is</strong>t of Capacities’,
Specified MCR power, % af L 1
Q = e jw% (– 0.0811 x ln (n M% ) + 0.8072 x ln (P ) + 1.2614)
M%
178 51 01-0.0
Fig. 6.04.02: Jacket water cooler, heat d<strong>is</strong>sipation Q jw% in
point M, in % of the L 1 value Q jw, L1
Q lub% = 67.3009 x ln (n M% ) + 7.6304 x ln (P M% )
- 245.0714
178 50 02-2.0
Fig. 6.04.03: Lubricating oil cooler, heat d<strong>is</strong>sipation Q lub%
in point M, in % of the L 1 value Q lub, L1
K90ME-C, K80ME-C, L70ME-C, S65ME-C, L60ME-C 198 43 74-2.2
90%
86%
82%
78%
Q jw%
94%
O
98%
P M%
110%
100%
90%
80%
70%
60%
80% 85% 90% 95% 100% 105% n M%
88%
90% 92% 94%
Q lub%
M
L 1
Specified MCR engine speed, % of L 1
Specified MCR power, % af L 1
96%
98% L 1
80% 85% 90% 95% 100% 105% n M%
M
Specified MCR engine speed, % of L 1
P M%
110%
100%
90%
80%
70%
60%