Abstract
The present paper describes results of experimental investigations of
pressure drop during the condensation of R134a, R404a and R407C
refrigerants in pipe minichannels with internal diameter 0.31-3.30 mm. The
results concern investigations of the mean and local pressure drop in
single minichannels. The results of experimental investigations were
compared with the calculations according to the correlations proposed by
other authors. A pressure drop during the condensation of refrigerants is
described in a satisfactory manner with Friedel and Garimella
correlations. On the basis of the experimental investigations, the authors
proposed their own correlation for calculation of local pressure drop
during condensation in single minichannels.
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