Abstract
The article discusses the problem how forced air flow is implemented through the cooling module of heavy-duty engines. The kinematic connection between the coolant pump and the crankshaft of the engine, results in the fact that the pump performance often does not correspond to the engine demand at its part load. In conjunction with the fan drive method, the temperature of the coolant may be too low or too high for part load. The study was carried out in order to calculate the parameters of the cooling system in heavy-duty engines for maximum power and maximum torque, taking into account a mechanical fan drive, a hydraulic fan drive and an electric fan drive.
Highlights
The performance of a coolant pump results from the kinematic connection with the crankshaft and, in most cases, does not correspond to the current engine demand for the parameters of the cooling system
Engine cooling parameters are influenced by non-engine cooling system components such as heat exchangers or fan characteristics
The mechanical fan drive is the simplest and cheapest solution, but it usually produces a significant difference in the coolant temperature between the maximum power and the maximum torque of the engine
Summary
The performance of a coolant pump results from the kinematic connection with the crankshaft and, in most cases, does not correspond to the current engine demand for the parameters of the cooling system. According to [1], a coolant pump generates a flow that far exceeds the engine demand, even up to 95% of operating time This is due to the fact that the components of the cooling system must be chosen in such a way that with high ambient temperature the conditions are met for the maximum load of the engine. In order to improve the efficiency of converting energy included in the fuel, higher and higher temperatures of cooling liquid are used [4, 7, 9] This practice aims at increasing the temperature of the engine work cycle by reducing the heat losses from the combustion chamber to the environment. In order to approximate the operating conditions of engines to adiabatic, the study is being carried out concerning the use of ceramic coating on cylinder liners [6]
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