Introduction to Cooling Forms of Diesel Generator Sets

What are the common cooling methods for diesel generator sets? Manufacturers of diesel generator sets will give you a detailed introduction to this question.

Air‑cooling

Air‑cooling adopts the fan‑blowing method. Cold air is blown over the stator and rotor of the diesel generator set to dissipate heat from the equipment. After absorbing heat, the cold air turns into hot air. It converges in the gap between the stator and rotor, flows out through the air ducts of the iron core, and achieves the cooling effect via the cooler. The cooled air is then sent back into the generator by the fan for circulating heat dissipation. Air‑cooling is generally applied to medium‑ and small‑sized synchronous diesel generator sets.

Hydrogen‑cooling

Hydrogen‑cooling uses hydrogen as the cooling medium. Hydrogen features better heat‑dissipation performance than air, and most large‑scale steam‑turbine generator sets adopt hydrogen‑cooling.

Water‑cooling

Water‑cooling is realized by the dual‑water internal‑cooling technology for both the stator and rotor. Cold water from the external water system of the stator water circuit flows through water pipes to the water‑inlet ring mounted on the stator frame. It then flows through insulated pipes to each coil. After absorbing heat, the water converges through insulated water hoses to the water‑outlet ring on the frame and is discharged to the external water system for cooling.

As pointed out by diesel generator manufacturers, water delivers superior heat‑dissipation performance compared with air and hydrogen. Therefore, water‑cooling is more widely used in modern industrial construction and adopted by numerous large‑ and medium‑sized generator manufacturers for their generator sets.

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