In this study the pressure drop and local heat transfer coefficient were investigated experimentally during the convective condensation of R-134a inside eight round (D = 0.8 mm) horizontal and parallel microchannels. The test conditions included mass velocity and pressure ranges of 57 to 125 kg.m−2s−1 and 6.8 to 11.2 bar, respectively. The experimental results are compared with correlations and semi-empirical models described in the literature.

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