The Cooling System Of Diesel Engine For Generators - Bison BS-20KVA Operation Manual

Chapter 2. Installation Precautions of Diesel Engine

6. The cooling system of diesel engine for generators

1-Radiator 2-Thermostat 3-Fan 4-Water pump 5-Water inlet pipe
(1) Cooling performance and layout of the cooling system
The design of cooling system is very essential for the proper operation of diesel engines. Lack of
cooling capability of the cooling system may easily cause the overheat of engine. The cooling liquids
of the cooling system can help take away extra heat produced during the engine operation, aiming at
bringing down the temperature of the system to ensure that the whole system and each hot spare part
can operate within optimal working temperature range.
To prevent overheat of the engine, diesel engine owned by power station is generally equipped with
exhaust fan. The inter-cooler is often placed at the location close to the fan. The cooling air can first cool
down the inter-cooler before it goes through the coolant tank.
(2) Engine ATB
ATB is a common indicator to measure the performance of the cooling system, representing the
permitted ambient temperature for the normal operation of diesel engines at the power station. For
diesel engine equipped with suction fan, ATB is equivalent to the permitted ambient temperature for
engine operation. For diesel engine equipped with exhaust fan, the inter-cooler and air in the water tank
are heated by the engine and its surface temperature. As a result, the air inlet temperature can represent
the cooling system performance instead of ATB.
ATB (suction fan) =Tbp-TW+Ta
Air inlet temperature (exhaust fan) = Tbp -TW+Tia
Tbp: The boiling point of the cooling liquid. In standard environment, the boiling point of water is 100℃
and the boiling point of anti-freezing liquid is classified by its composition.
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