This　work　experimentally　studied　the　single-phase　heat　transfer　and　pressure　drop　characteristics　by　using　two　heat　transfer　enhancement　techniques　(micro　fin　structure　and　nanofluids)　in　multipart　minichannel　flat　tube　(MMFT).　MMFT　consisted　of　numerous　parallel　rectangular　minichannels　and　is　widely　used　in　industry　as　the　heat　transfer　unit　of　a　heat　exchanger.　Firstly,　the　enhanced　heat　transfer　performances　by　individually　using　one　enhancement　technique　were　investigated　by　testing　Nusselt　number,　friction　factor　and　performance　evaluation　criterion　(PEC).　In　this　section,　five　MMFTs　with　different　micro　fin　numbers　(N　=　0,　1,　2,　3　and　4)　and　nanofluids　with　three　volume　concentrations　(phi　=　0.005%,　0.01%　and　0.1%)　were　used　as　test　sections　and　working　fluids　respectively.　Secondly,　the　experiments　using　two　combined　enhancement　technique　were　performed.　By　using　conjunctively　two　enhancement　techniques,　Nusselt　number　increases　by　up　to　158%　at　about　Re　=　3600　and　the　maximum　PEC　value　can　reach　2.0　at　Re　=　5150.　Finally,　an　optimal　heat　transfer　scheme　was　proposed　based　on　test　data.　(C)　2016　Elsevier　Inc.　All　rights　reserved.