How is CO2 compared to ammonia?
- Direct-expansion systems possible
- No toxicity of the refrigerant
- No gas-tight machinery room required
- Smaller piping
- Less weight on the building structure
- Pipes and evaporators can be doubled due to small pipe dimensions
- Standard and reliable system design
- Possible to install two completely independent systems, each with 100% capacity
|
Ammonia (NH3) |
CO2 |
|
-43 °C |
-40 °C |
|
Auxiliary equipment, e.g. pump module, air purge, water separator |
No auxiliary equipment needed |
|
5000 m piping + cabling |
1000–2000 m piping, less than half the pipe diameter) |
|
2000 engineering hours |
300 engineering hours |
|
Water consumption |
No water consumption |
|
Limited heat-recovery potential |
High heat-recovery potential |
|
12 weeks’ installation time |
3 weeks’ installation time |
|
Safety risk management required 24/7 |
No safety risk management required |
|
Gas-tight machinery room required, isolated from production |
Machinery room can be located next to production |
|
3.5 kg/kW |
1.2–1.5 kg/kW (30% of ammonia) |
|
Regulatory costs |
No regulatory costs |