Fuel system
74
Fuel cooler for D5/D7
Increasing the fuel temperature above 40°C (meas-
ured at the inlet to the injection pump) leads to a
decrease in power of approx. .5 % per 5°C, and at
higher temperatures, to vapour bubble formation and
backfiring. The maximum permissible
continuous
fuel temperature is 75°C, whereas a short-term
fuel temperature of up to 90°C can be tolerated at
the feed pump inlet in special cases depending on
the power setting of the engine and the fulfilment of
emission values.
Today, modern engines with high pressure injec-
tion require a lower fuel temperature level. Through
design and material selection when building the fuel
tank and its mounting position in the unit (good vent-
ing, avoiding additional heating), the fuel temperature
characteristics can be influenced. Safe and defined
heat dissipation can also ensured by an accordingly
dimensioned fuel cooler.
Theses kind of fuel coolers are integrated into the
cooling system of the engine (air side) and are flowed
through by returning fuel. The fuel cooler flow resist-
ance must not be higher than 5 kPa (2.2 psi).
The overall resistance of return system including fuel
cooler must not exceed 50 kPa (7.2 psi).
The cooler size should be approx. 2 - 4 kW.
Fuel cooler
Содержание D11 series
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Страница 212: ...7748655 English 11 2007 ...