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18 16 Unconstrained air flow rate over condenser 14 12 10 8 6 4 2 0 3 8 13 18 23 Evaporating Temperature (C) Figure 4.8 Effect of evaporating temperature on cooling cycle efficiency with unconstrained airflow rate over condenser/gas cooler 12 11 10 Matched air flow rate over outdoor coil 9 8 7 6 5 4 3 2 1 R410A, Cond. ref. exit temp=35 C R744. Gas cooler ref. exit temp=35 C R410A, Condenser ref. exit temp=45 C R744, Gas cooler ref. exit temp=45 C R410A, Cond. ref. exit temp=35 C R744, Gas cooler ref. exit temp=35 C R410A, Cond. ref. exit temp=45 C R744, Gas cooler ref. exit temp=45 C 3 8 13 18 23 Evaporating Temperature (C) Figure 4.9 Effect of evaporating temperature on cooling cycle efficiency with matched air flow rates over condenser/gas cooler Because the SHR is theoretically independent of capacity and airflow rate, a given capacity can be achieved for a finite area indoor heat exchanger by varying the airflow rate. Increasing the airflow rate increases the air/refrigerant temperature difference across the indoor coil resulting in a higher heat transfer rate. To maintain a surface temperature to meet a given SHR, the flow of refrigerant needs to be modulated by a variable capacity compressor. 30 Cooling COP Cooling COPPDF Image | Comparison of R744 and R410A
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