min. 60°C
Preheating temperature
2 kW/cyl
Required heating power
1 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
=
Lubricating oil volume [m
3
] (wet sump engines only)
V
LO
=
HT water volume [m
3
]
V
FW
=
Preheating time [h]
t =
Engine specific coefficient = 0.5 kW
k
eng =
Number of cylinders
n
cyl =
P < 2 kW/cyl
The formula above should not be used for
9.3.9.2
Circulation pump for preheater (4P04)
Design data:
0.3 m
3
/h per cylinder
Capacity
80...100 kPa (0.8...1.0 bar)
Delivery pressure
9.3.9.3
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
Wärtsilä 20 Product Guide - a13 - 6 September 2016
9-17
9. Cooling Water System
Wärtsilä 20 Product Guide
Содержание WARTSILA 20
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