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This research is dedicated to the experimental study of condensation heat transfer in horizontal multiport mini-channel using R134a.A new experimental apparatus has been fabricated in order to obtain explicit local heat transfer coefficient measurements over a range of test conditions.The test section is an 852 mm long horizontal rectangular multiport mini-channel having 20 smooth channels with an equivalent diameter of 0.81 mm and 20 groove channels with an equivalent diameter of 0.64 mm.