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comparison and reconfigured to eliminate the gas-vapor line flooding. All of the following results are for the ARI 21oC/8.3oC indoor/outdoor heat pump rating condition. B.2 Experimental Results Figure B.2 shows a comparison of the capacity and heating COP of the R744 system for the R744/R410A comparison and the vertical indoor coil with the suction accumulator adjusted and unadjusted. The capacity shown in Figure B.2 is based on the indoor chamber energy balance, which is believed to be the most accurate balance (during the experiments with the vertical coil runs the glycol energy balance agreed with the electrical input to the chamber within 1.5%). The capacity of the re-orientated coil/no suction accumulator adjustment is about 5% higher than the other two cases, while the efficiency of both the re-orientated cases is between 5 and 10% higher than the R744/R410A comparison results. From Figure B.3, which shows the compressor work for each of the points plotted in Figure B.2, it is evident that higher efficiency for the re-orientated coil/no suction accumulator adjustment is primarily from the increased capacity. The improvement for the re-orientated/suction accumulator adjusted case is primarily the result of a decrease in the compressor power. 10.6 10.4 10.2 10.0 9.8 9.6 9.4 9.2 9.0 7400 7600 7800 8000 8200 8400 Discharge Pressure (kPa) 4.3 4.2 4.1 4.0 3.9 3.8 7400 7600 7800 8000 8200 8400 Discharge Pressure (kPa) Comparison with R410A results Re-orientated indoor coil/No suct. acc. adjust. Re-orientated indoor coil/Suct. acc. adjust. Figure B.2 Comparison of capacity and efficiency with re-orientation of indoor coil and adjustment of suction accumulator 60 Capacity (kW) Heating COPPDF Image | Comparison of R744 and R410A
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