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2.7 2.6 2.5 2.4 2.3 2.2 7400 7500 7600 7700 7800 7900 8000 8100 8200 8300 8400 8500 Discharge Pressure (kPa) Figure B.3 Compressor power for capacity/efficiency results Because of the timing of the tests and the configuration of the system and chambers, the results compared with R410A were run with dry outdoor coils while condensate may have been present on the outdoor coil during the re-orientated coil tests. However, this does not appear to have influenced the evaporating temperature in the outdoor coil as shown in Figure B.4. Since the outdoor coil in the R744 system is fed by three manual expansion valves (Appendix A), it was not possible to keep the outdoor chamber sealed during testing. As a result, each time the valves were adjusted air from the room would leak into the chamber. The R744/R410A tests were run in March when this air was relatively dry, as compared to the re-orientated coil tests that were run in June and July. Since the source of the condensate on the outdoor coil was from intermittent leakage of room air and the evaporating temperatures are comparable, it is not believed that the difference between a wet and dry outdoor coil explains the improved capacity seen in the re -orientated coil results. Difficulty in exactly duplicating the dry testing conditions, however, was one consideration in not re-running the full R410A comparison test matrix. Comparison with R410A results Re-orientated indoor coil/No suct. acc. adjust. Re-orientated indoor coil/Suct. acc. adjust. 61 Compressor Work (kW)PDF Image | Comparison of R744 and R410A
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