Air density drops with altitude; cooling and electricals must be corrected.
1. Effects
Above 3000m density drops ~30%; heat exchange and insulation degrade.
2. Measures
Larger condenser, higher fan speed, corrected clearances, derated sizing.
3. Sites
Highland solar/hydro, Tibet/Qinghai substations, Andes mines.
| Altitude | Action |
|---|---|
| 2000m | standard check |
| 3000m | bigger condenser |
| 4500m+ | full derating |
HCK high-altitude custom units keep rated cooling at 3000m+.