TEWAC Generator Cooler

Today, let’s talk about water-cooled generators. “Water cooling” is not a direct water cooling generator, but a simple expression of “indirect air and water cooling”, which is generally referred to as IC81W (IEC60034-6 and GB/T1993 are defined as IC81W, NEMA MG1 is defined as TEWAC, and in some places, CACW is used to represent indirect air and water cooling).

Water-cooled generators have the advantages of low noise, high IP protection level, and high reliability in a harsh environment, and are very suitable for various ships with high-reliability requirements for generators.

Let’s look at the structure and heat dissipation principle of the indirect water-cooled generator. In the schematic diagram below, the lower half is the main body of the generator, and the upper half is the air-water cooler.

The red hot air is driven by the centrifugal fan on the main shaft of the generator, is extracted from the inside of the generator, and enters into the cavity of the air-water cooler. When the hot air passes through the air-water heat exchanger unit, it exchanges heat with water and transfers heat to the cooling water, so that the blue cold air flows out from the other side, and finally enters the inside of the generator, passing through the stator and rotor of the generator, So as to cool the generator.

The air only circulates between the generator and the water cooler and is completely isolated from the outside, so that the generator can effectively prevent solid dust and water from entering the generator, so that the generator can reach the high protection level of IP44, and even reach the protection level of IP55 after further special treatment.

Based on the high reliability required by the marine generator, in addition to the generator itself which needs to be designed and manufactured in strict accordance with the classification society’s specifications, the air-water heat exchange unit of the water cooler is also a very critical component, which determines the cooling effect of the generator and thus affects the output of the generator.

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