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Figure 2.6 Frost pattern on outdoor coil indicating maldistribution 34 32 30 28 26 24 22 20 6800 7200 7600 Solid line: Matched A/C Capacity Dashed Line: Matched Heat Pump Capacity Outdoor Temp.: 1.7 C Outdoor Temp.: 16.7 C Outdoor Temp.: 8.3 C Outdoor Temp.: -8.3 C 8000 8400 8800 Return Air Temp.: 21 C Discharge Pressure (kPa) Figure 2.7 R744 gas cooler performance (indoor temperature 21oC) The isentropic efficiency for the R744 compressor used in the heat pump system is shown in Figure 2.8. At equal comp ression ratios the efficiency of the R410A compressor is slightly higher. The four points plotted for R410A correspond to the compressor efficiency at each outdoor test temperature. The lowest compression ratio corresponds to the highest outdoor temperature (16.7oC) and the highest compression ratio corresponds to the lowest outdoor temperature (-8.3oC). Because the compression ratio for R744 is lower than for R410A at each operating condition, the compressor operating efficiency for R744 ends up being slightly higher. 9 Refrigerant Exit Temperature from Gas Cooler (C)PDF Image | Comparison of R744 and R410A
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