Auxiliary Machinery Capacities; Cooler Heat Dissipations - Man B&W S50ME-B9.3-TII Project Manual

MAN B&W

Auxiliary Machinery Capacities

The dimensioning of heat exchangers (coolers)
and pumps for derated engines can be calculated
on the basis of the heat dissipation values found
by using the following description and diagrams.
Those for the nominal MCR (L
if wanted.
The nomenclature of the basic engine ratings and
coolers, etc. used in this section is shown in Fig.
6.01.01 and 6.01.02.

Cooler heat dissipations

For the specified MCR (M) the following three dia-
grams in Figs. 6.04.01, 6.04.02 and 6.04.03 show
reduction factors for the corresponding heat dis-
sipations for the coolers, relative to the values
stated in the 'List of Capacities' valid for nominal
MCR (L ).
1
L
3
L
4
80% 85% 90%
Q = 100 x (P /P ) x (n
1.68
air% M L1
Fig. 6.04.01: Scavenge air cooler, heat dissipation Q
point M, in % of the L value Q
1
MAN B&W G80ME-C9.2.68-TII, S70MC-C8.2-TII,
S70ME-C8.2/-GI-TII, S65ME-C/ME-GI8.2-TII, S/L60MC-C8.2-TII,
S60ME-C8.2/-GI-TII, S60ME-B8-TII, L60ME-C8.2-TII,
G50ME-B9.3-TII, S50MC-C8.2-TII, S50/ME-C8.2/-GI-TII,
S50ME-B8/9-TII, S46MC-C8-TII, S46ME-B8-TII, G45ME-B9.3-TII,
G40ME-B9.3-TII, S40MC-C9.2-TII, S40ME-B9-TII, S35ME-B9-TII,
S35MC-C9.2-TII, S30ME-B9.3-TII
), may also be used
1
Specified MCR power, % of L
1
P
M%
110%
L
1
100%
100%
90%
M
90%
Q
80%
air%
70%
80%
L
2
65%
70%
60%
110% n
95% 100% 105%
M%
Specified MCR engine speed, % of L
178 63 63-8.0
/n ) = 1
– 0.83
M L1
air%
air, L1
MAN Diesel
The percentage power (P
ie: P = P /P
M% M
n = n /n
M% M L1
for specified MCR (M) of the derated engine is
used as input in the abovementioned diagrams,
giving the % heat dissipation figures relative to
those in the 'List of Capacities'.
L
90%
3
86%
82%
78%
L
4
80% 85%
Q = e
(– 0.0811 x ln (n
jw%
Fig. 6.04.02: Jacket water cooler, heat dissipation Q
in point M, in % of the L
90%
L 88%
3
1
L
4
in
80% 85%
Q = 67.3009 x ln (n
lub%
 245.0714
Fig. 6.04.03: Lubricating oil cooler, heat dissipation
Q in point M, in % of the L
lub%
Page 1 of 12
) and speed (n
M%
x 100%
L1
x 100%
Specified MCR power, % of L
L
1
100%
98%
94%
M
Q
jw%
L
2
90% 95% 100% 105%
Specified MCR engine speed, % of L
) + 0.8072 x ln (P ) + 1.2614)
M% M%
value Q
1 jw, L1
Specified MCR power, % of L
L
1
100%
98%
96%
94%
M
92%
Q
lub%
L
2
90% 95% 100% 105%
Specified MCR engine speed, % of L
) + 7.6304 x ln (P
M%
value Q
1 lub, L1
6.04
) of L
M% 1
1
P
M%
110%
100%
90%
80%
70%
60%
110% n
M%
1
178 63 62-6.1
jw%
1
P
M%
110%
100%
90%
80%
70%
60%
110% n
M%
1
178 63 65-1.1
)
M%
198 71 49-5.6