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30 25 20 15 10 5 R410A (No IHX) 0 -15 -10 -5 0 5 10 15 20 25 Evaporating temperature (C) Figure 3.8 Cooling cycle efficiencies (gas cooler exit temperature 35oC) Comfort constraint R744 (w/ IHX) R744 (No IHX) 20 10 R744, optimized 0 10 8 6 4 Figure 3.9 Effect of air flow rate on R410A cooling cycle efficiency (gas cooler exit temperature 35oC, evaporating temperature 12oC) Additionally in Figure 3.9, there is a peak in the average air/refrigerant temperature difference. At higher efficiency with lower condensing temperatures the airflow rate is high and the temperature difference between the condensing temperature and the air stream is small. As the condensing temperature is increased, this difference increases. At lower efficiency with high condensing pressures, since the assumed air flow rate is minimized based R410A Infinite Airflow Matched Airflow 4 5 6 7 8 9 10 11 Cooling COP 19 Average gas cooler [m3/min/kW cooling] temperature diff. [C] Min. vol. air flow rate Cooling COPPDF Image | Comparison of R744 and R410A
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