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Solid symbol: R744 6 Open symbol: R410A 5 4 3 2 1 0 Figure 4.21 Effect of heat exchanger area on system heating COP, 8.3oC outdoor heating condition, 40oC supply air temperature 5 4 3 2 1 0 0.0 R410A Cycle Eff. R410A System Eff. R744 Cycle Eff. 11000 10000 9000 8000 7000 6000 5000 4000 3000 2000 0.0 0.1 R744 Airflow Rate (outdoors): 2468 Airside Area (m 2/kW heating capacity) R744 System Eff. 0.1 0.2 0.3 R410A Airflow Rate Over Outdoor Coil (kg/s) Airflow Rate Over Outdoor Coil (kg/s) 0.05 kg/s 0.15 kg/s 0.25 kg/s 0.35 kg/s 0.45 kg/s 0.4 0.5 0.2 0.3 0.4 0.5 Figure 4.22 Effect of airflow rate on cooling cycle and system efficiency for 45oC outdoor cooling condition, 12oC evaporating temperature The effect of required heat exchanger area relative to the optimum discharge pressure is different for the two refrigerants. For R744, since the optimum discharge pressure is fixed, increasing the airflow rate increases the 40 Cooling COP System Heating COP "Optimum" Discharge Pressure (kPa)PDF Image | Comparison of R744 and R410A
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