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Generator Heat Exchanger for Hydro Power Plant
Hydroelectric generators generate heat during operation due to three main types of losses:
Electrical losses: Copper loss (in stator/rotor windings) and eddy current loss (in iron cores).
Mechanical losses: Friction loss (in bearings, slip rings) and windage loss (air resistance from rotating parts).
Additional losses: Stray loss from unbalanced magnetic fields, etc.
The generator heat exchanger’s role is to efficiently remove this excess heat and maintain the generator’s operating temperature within a safe range (typically: stator winding temperature < 80–100°C, bearing temperature < 60–70°C, depending on insulation class and manufacturer specifications). Without effective heat dissipation, insulation materials may age prematurely, leading to short circuits, generator efficiency degradation, or even catastrophic failures.
Type: Air Cooler (Air-Air/Air-Water)
Heat Exchange Medium: Air (hot side) + Air/Water (cold side)
Core Structure: Fin-and-tube structure (aluminum/copper fins, steel tubes)
Application: Small-to-medium generators; dry/arid regions (air-air); areas with abundant cooling water (air-water)
Advantages: Simple structure, low maintenance cost, no risk of water leakage into the generator
