It is recommended to heat the HT water to a temperature near the normal operating
temperature. The heating power determines the required time to heat up the engine from cold
condition.
The minimum required heating power is 12 kW/cyl, which makes it possible to warm up the
engine from 20 ºC to 60...70 ºC in 10-15 hours. The required heating power for shorter heating
time can be estimated with the formula below. About 6 kW/cyl is required to keep a hot engine
warm.
Design data:
min. 60°C for starts at LFO; Min 70°C for startings at HFO
Preheating temperature
12 kW/cyl
Required heating power
6 kW/cyl
Heating power to keep hot engine warm
Required heating power to heat up the engine, see formula below:
where:
Preheater output [kW]
P =
Preheating temperature = 60...70 °C
T
1
=
Ambient temperature [°C]
T
0 =
Engine weight [ton]
m
eng
=
HT water volume [m
3
]
V
FW
=
Preheating time [h]
t =
Engine specific coefficient = 3 kW
k
eng
=
Number of cylinders
n
cyl
=
P < 10 kW/cyl
The formula above should not be used for
9.3.12.2
Circulation pump for HT preheater (4P04)
Design data:
1.6 m
3
/h per cylinder
Capacity
80...100 kPa (0.8...1.0 bar)
Delivery pressure
9.3.12.3
Preheating unit (4N01)
A complete preheating unit can be supplied. The unit comprises:
●
Electric or steam heaters
●
Circulating pump
●
Control cabinet for heaters and pump
●
Set of thermometers
●
Non-return valve
●
Safety valve
DAAB605814
9-19
9. Cooling Water System
Wärtsilä 46F Product Guide
Summary of Contents for 46F Series
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