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Design and Operation
from Volvo Penta TAD1240GE TAD1241GE-VE TAD1242GE-VE, TWD1240VE Group 22-26 Workshop Manual_381897674
Cooling system (TAD)
The cooling system is a closed fresh-water system with a piston thermostat which controls the water temperature.
Cooling system (TWD)
The cooling system is a closed fresh-water system with a piston thermostat which controls the water temperature.
The TWD engine has a water-cooled charge air cooler that is integrated into the engine cooling system.
An extra coolant pump supplies the charge air cooler and is installed on the generator.
Charge air cooler
On TAD engines, the charge air cooler is located with the radiator and is air cooled. On TWD engines, the charge air cooler is located at the intake manifold on the left-hand side of the engine and is water cooled. The purpose of the charge air cooler is to cool the intake air, which means that the specific volume of the air is reduced so that larger quantities of air can be forced into the combustion chamber. This means better combustion of fuel and hence better fuel efficiency.
Cooling the engine charge air gives a power increase of about 10%, increased torque and reduced fuel consumption.
A diesel engine with turbocharger and charge air cooler has the best efficiency of all internal combustion engines.
