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MAN B&W 6.04
Condensator
Produced
freshwater
Evaporator
Jacket Cooling Water Temperature Control
When using a normal freshwater generator of the
single�effect vacuum evaporator type, the freshwater
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 �15%/0% [3]
where
M fw <strong>is</strong> the freshwater production in tons per 24
hours
and
Freshwater generator system
Brine out
Q jw <strong>is</strong> to be stated in kW
Seawater
In Out
MAN B&W K98ME/ME-C-T-II, S90ME-C-T-II, K90ME/ME-C-T-II,
S80ME-C-T-II, K80ME-C-T-II, S70ME-C/ME-GI-T-II, L70ME-C-T-II,
S65ME-C/ME-GI-T-II, S60ME-C/ME-B/ME-GI-T-II,L60ME-C-T-II
MAN Diesel
Jacket cooling water system
Expansion tank
Page 6 of 12
Valve A: ensures that T jw < 85° C
Valve B: ensures that T jw > 85 – 5° C = 80° C
Valve B and the corresponding by�pass may be omitted if, for example, the freshwater generator <strong>is</strong> equipped with an automatic
start/stop function for too low jacket cooling water temperature
If necessary, all the actually <strong>available</strong> jacket cooling water heat may be util<strong>is</strong>ed 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 flow diagram
B
A
Jacket water
cooler
Cooling
water
Deaerating tank
min
Tjw
Jacket cooling
water circuit
Jacket water pumps
max
Tjw L M
K
Main engine
178 23 70�0.0
If necessary, all the actually <strong>available</strong> jacket cooling
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 cons<strong>is</strong>t, e.g., of a
special by�pass pipe installed in the jacket cooling
water system, see Fig. 6.04.05, or a special built�in
temperature control in the freshwater generator,
e.g., an automatic start/stop function, or similar.
If such a special temperature control <strong>is</strong> not applied,
we recommend limiting the heat util<strong>is</strong>ed to maximum
50% of the heat actually <strong>available</strong> at specified
MCR, and only using the freshwater generator at
engine loads above 50%. Considering the cooler
margin of 10% and the minus tolerance of �15%,
th<strong>is</strong> heat corresponds to 50 x(1.00�0.15)x0.9 = 38%
of the jacket water cooler capacity Q jw,M used for
dimensioning of the jacket water cooler.
198 71 45-8.0