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The vapor line-liquid line intersection after the suction accumulator was, under certain conditions, below the level of liquid in the accumu lator. As a result, this intersection was flooded with liquid defeating the purpose of the suction accumulator. Subsequent experiments with the suction accumulator reconfigured showed cycle COP improvement on the order of 5-10% above the COPh values shown in the previous figures. During these tests, however, the orientation of the indoor coil had also been changed. A study by Song et al. (2001) showed that the angle of the heat exchanger in the duct did not influence the heat transfer performance but did influence the air pressure drop across the coil. Based on these results the indoor coil was rotated 90o and placed perpendicular to the incoming air stream. As a result, it is not certain that the reconfigured suction accumulator was independently responsible for the improvement in efficiency. A full discussion of the results is presented in Appendix B. 2.6 Conclusions regarding experimental performance of R410A and R744 These preliminary results from the R744 RAC1 system provide evidence that system performance is consistent with expectations based on thermodynamic cycle considerations. Using heat exchangers that are designed to match the packaging constraints of a conventional R410A air conditioning system, which has smaller heat exchangers than the baseline R410A heat pump system, we observed comparable cycle-COP and greater capacity at lower outdoor temperatures from the R744 system. The increased capacity of the R744 system at lower outdoor temperatures has considerable impact when calculating the overall system efficiency for an application, as the dependence on supplementary heating is reduced. 11PDF Image | Comparison of R744 and R410A
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