MAN B&W 6.04
Page 6 of 12
MAN Diesel
MAN B&W ME/MEC/MEGI engines 198 43 012.2
Jacket Cooling Water Temperature Control
When using a normal freshwater generator of the
singleeffect vacuum evaporator type, the fresh-
water production may, for guidance, be estimated
as 0.03 t/24h per 1 kW heat, i.e.:
M
fw
= 0.03 x Q
jw
t/24h 1%/0% [3]
where
M
fw
is the freshwater production in tons per 24
hours
and
Q
jw
is to be stated in kW
Valve A: ensures that T
jw
< 8° C
Valve B: ensures that T
jw
> 8 – ° C = 80° C
Valve B and the corresponding bypass may be omitted if, for example, the freshwater generator is equipped with an automatic
start/stop function for too low jacket cooling water temperature
If necessary, all the actually available jacket cooling water heat may be utilised provided that a special temperature control system
ensures that the jacket cooling water temperature at the outlet from the engine does not fall below a certain level
Fig. 6.04.05: Freshwater generators. Jacket cooling water heat recovery ow diagram
178 23 700.0
If necessary, all the actually available jacket cool-
ing water heat may be used provided that a special
temperature control system ensures that the jacket
cooling water temperature at the outlet from the
engine does not fall below a certain level. Such a
temperature control system may consist, e.g., of a
special bypass pipe installed in the jacket cooling
water system, see Fig. 6.04.0, or a special builtin
temperature control in the freshwater generator,
e.g., an automatic start/stop function, or similar.
If such a special temperature control is not applied,
we recommend limiting the heat utilised to maxi-
mum 0% of the heat actually available at specied
MCR, and only using the freshwater generator at
engine loads above 0%. Considering the cooler
margin of 10% and the minus tolerance of 1%,
this heat corresponds to 0 x(1.000.1)x0.9 = 38%
of the jacket water cooler capacity Q
jw,M
used for
dimensioning of the jacket water cooler.
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