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What is the difference between an air-cooled diesel generator set and a water-cooled diesel generator set?

May 17, 2022
The temperature of the diesel generator set will rise when it is running. In order to ensure that the heated parts of the diesel generator set and the supercharger shell are not affected by high temperature, and to ensure the lubrication of each working surface, it is necessary to cool the heated part. Generally speaking, the common cooling methods of diesel generator sets are air cooling and water cooling; when purchasing diesel generator sets, users must combine the use environment and requirements, and communicate with generator manufacturers well, in order to purchase suitable diesel generator sets.
1. Air cooling method
The air cooling method uses air as the cooling medium to transmit the heat of the heated parts of the diesel engine. This cooling method consists of a cooling fan and a guide cover.
In order to increase the heat dissipation neps, many corrugated heat dissipation fins are usually cast on the outer wall of the cylinder block, cylinder head and each radiator. During operation, the fan rotates to flow the air along the air guide hood to the surface of the cylinder block and the cylinder head. When the cold air flows through the heat sink, the heat from the cylinder block and the cylinder head is taken away.
The air-cooled cooling system has a simple structure and reduced weight, but the cooling effect is poor. It is mostly used in small diesel engines and is suitable for water-deficient areas.
2. Water cooling method
The water cooling method is to use water as a cooling medium to transmit the heat of the heated parts of the diesel engine. The feature of this cooling method is that it is easy to adjust the cooling intensity when the air temperature or workload changes.
There are two types of water cooling: separate water cooling and closed water cooling. In an open cooling system, the circulating water is directly connected to the atmosphere, and the steam pressure in the cooling system is always maintained at atmospheric pressure. In the closed system, the water circulates in the closed system, and the vapor pressure of the cooling system is greater than the atmospheric pressure. Since the temperature difference between the cooling water temperature and the outside air temperature increases, the heat dissipation capacity of the entire cooling system is improved.