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required is on the order of 2 W/m2 K. The 0.5 kW capacity line shows the reduction in airflow that would be required to maintain the same SHR for a fixed area heat exchanger. In heating mode, the airflow rate is fixed by the comfort constraint and the heat exchanger area required is a function of the pressure and mass flow rate of the refrigerant. Because the temperature difference goes to zero at the pinch points, the area required to accommodate heat transfer in this region accounts for the majority of the overall heat exchanger size. This is illustrated in Figure 4.16 which shows the air and refrigerant temperature profiles for an R744 counterflow gas cooler having 1 kW of capacity, supplying air at 60oC with approach and pinch point temperature differences of 0.2oC. 0.30 0.25 0.20 0.15 0.10 0.05 0.00 Sensible heat ratio = 0.75 Air inlet temperature = 27 C Relative humidity = 50% h=90 W/m 2 K 01234 Indoor coil airside area (m2) Figure 4.15 Controlling air-side capacity in cooling mode by adjusting air flow rate over evaporator coil 100 90 80 70 60 50 40 30 20 Figure 4.16 Temperature profile in gas cooler Refrigerant temperature Interior pinch point Air temperature Approach pinch point 0 2 4 6 8 10 12 Cumulative Air Side Area per kW (sq m) R410A, 1 kW Capacity R744, 1 kW Capacity R410A, 0.5 kW Capacity R744, 0.5 kW Capacity 35 Temperature (C) Air flow rate (kg/s)PDF Image | Comparison of R744 and R410A
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