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The sharp decay of the evaporating temperature as the SHR is decreased in Figure E.2 can be explained in terms of the psychrometric plot: as the SHR is decreased, the slope of the line gets steeper, which, when coupled with the curve of the saturation line, produces the sharp decay. 24 22 20 18 16 14 12 10 8 6 4 2 Inlet air condition: 0.6 0.7 0.8 0 . 9 1.0 Sensible Heat Ratio 27 C, 50% RH 27 C, 80% RH 0.4 0.5 Figure E.2 Evaporating temperature dependence on inlet conditions for a given sensible heat ratio (R744) 0.5 0.4 0.3 0.2 0.1 0.0 SHR=0.75, Capacity 1 kW SHR=0.75, Capacity 0.75 kW SHR=0.75, Capacity 0.25 kW SHR=0.90, Capacity 1 kW SHR=0.90, Capacity 0.75 kW SHR=0.90, Capacity 0.25 kW 01234567 Evaporator Area (m2) Figure E.3 Capacity control for finite heat exchange area by varying air flow rate (R744) Since the evaporating temperature for a given SHR is independent of air flow rate, a specified SHR can be met from a fixed sized heat exchanger for a range of capacities by adjusting the air flow rate. Changing the airflow rate changes the air side heat transfer coefficient which then changes the area required for the same heat transfer. As a result, by controlling both the compressor displacement and airflow rate the SHR can be adjusted for a fixed area heat exchanger. This is shown in Figure E.3 where the relationship between airflow rate and evaporator area is shown for three capacities and two sensible heat ratios, based on the assumptions above. 76 Air Flow Rate (kg/s) Evaporating Temperature (C)PDF Image | Comparison of R744 and R410A
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