The operating characteristics of the refrigeration unit were tested under different evaporating temperatures,
condensing temperatures, sub-cooling degrees, over-heating degrees, etc. The performances of this unit are hence
calculated with these test data. Some of the test results and the calculated results are shown in the following figures.
The reference parameters in these figures are the condensing temperatures of this unit.
Figure 2 is the comparison of discharge temperatures of the compressor between R404A and R502. It is clear that
both the discharge temperatures of R404A and R502 increase with the drop of the evaporating temperature and the
increase of the condensing temperature. But, at the same condensing temperature and the same evaporating
temperature, the discharge temperature of R404A is obviously lower than that of R502. The difference is about 3-
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