N+1 Principle
Deploy N working units plus one hot standby; if any single unit fails, the remaining fleet still meets total load, preventing cabin overheating. Used where downtime is unacceptable.
Capacity Sizing
With unit capacity Q_unit, N = ceil(Q_total / Q_unit), total N+1 units. Example: 30 kW load, 10 kW/unit → N=3, configure 4 units.
| Parameter | Value |
|---|---|
| Total load | 30 kW |
| Per unit | 10 kW |
| Config | 4 units (3+1) |
Operation
- Group control starts/stops by return-air temp, avoid synchronized cycling
- Rotate primary/standby to balance wear
- Auto-isolate fault, alarm, remaining units ramp up
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