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| Table 1: pilot system’s recorded and design performance | ||
| High side | Actual | Design |
| Copeland ZB45KCE-TFD x 2 R404 circuit | ||
| Temperature (condenser) | 36°C | 36°C |
| Temperature (evaporator) | -15°C | -15°C |
| Cooling load | 17.8kW | 15.0kW |
| Power input (R404a compressed) | 7.0kW | 8.0kW |
| Power input (condenser fans) | 0.5kW | 1.7kW |
| Total heat of rejection | 24.8kW | 23.0kW |
| Coefficient of performance | 2.39 | 1.5 |
| Medium temperature CO2 circuit | ||
| Temperature (evaporator) | -10°C | -10°C |
| Cooling load | 4.7kW | 4.7kW |
| Power input (pump) | 0.8kW | 1.0kW |
| Coefficient of performance | 5.7 | 4.7 |
| Low temperature CO2 circuit | ||
| Bitzer 2KC-3.2 K | ||
| Temperature (condenser) | -10°C | -10°C |
| Temperature (evaporator) | -28°C | -28°C |
| Cooling load | 10.0kW | 10.0kW |
| Power input (CO2) | 1.8kW | 1.5kW |
| Total power input | 11.8 | 11.5 |
| Coefficient of performance | 5.6 | 6.7 |
| TOTAL SYSTEM | ||
| Power (total) | 10.1kW | 12.2kW |
| COP | 1.5 | 1.2 |
| Table 2: Tewi comparison of standard and natural cascade systems | |
| System and period of assessment | CO2 |
| Standard R-404a system, Tewi 1 year | 1310.8 tonnes |
| Cascade system, Tewi 1 year | 536.7 tonnes |
| Difference between systems over 1 year | 774.2 tonnes |
| Standard R-404a system, Tewi 10 year | 13108.4 tonnes |
| Cascade system, Tewi 10 year | 5366.8 tonnes |
| Difference between systems over 10 year | 7741.5 tonnes |
| Based on 61% run time. Tewi %3D total equivalent warming impact | |