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Table 1: pilot system’s recorded and design performance
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High side ActualDesign
Copeland ZB45KCE-TFD x 2 R404 circuitÌýÌý
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 2.391.5
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Medium temperature CO2 circuitÌýÌý
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Temperature (evaporator) -10°C -10°C
Cooling load 4.7kW 4.7kW
Power input (pump) 0.8kW 1.0kW
Coefficient of performance 5.74.7
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Low temperature CO2 circuit ÌýÌý
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Bitzer 2KC-3.2 K ÌýÌý
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 11.811.5
Coefficient of performance 5.66.7
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TOTAL SYSTEM ÌýÌý
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Power (total) 10.1kW 12.2kW
COP 1.51.2
Table 2: Tewi comparison of standard and natural cascade systems
System and period of assessmentCO2
Standard R-404a system, Tewi 1 year1310.8 tonnes
Cascade system, Tewi 1 year536.7 tonnes
Difference between systems over 1 year774.2 tonnes
Standard R-404a system, Tewi 10 year13108.4 tonnes
Cascade system, Tewi 10 year5366.8 tonnes
Difference between systems over 10 year7741.5 tonnes
Based on 61% run time. Tewi %3D total equivalent warming impact