This　paper　proposes　a　thermoelectric　assisted　indirect　evaporative　cooling　(TIEC)　system,　in　which　thermoelectric　cooling　modules　are　sandwiched　between　channels　of　a　plate-fin　indirect　evaporative　cooler　operated　in　a　countercurrent　flow　mode.　As　the　moisture　content　of　fresh　air　is　high,　condensation　may　occur　in　the　dry　channels.　A　mathematical　model　of　this　novel　system　is　developed　with　taking　the　condensation　from　primary　air　into　consideration.　Performance　analysis　of　the　TIEC　system　with　condensation　is　conducted　in　detail.　Analytical　results　show　that　the　condensation　from　primary　air　weakens　the　performance　of　system　by　reducing　the　values　of　the　coefficient　of　performance　and　dew　point　effectiveness.　The　effects　of　main　operating　conditions,　such　as　the　electrical　current　and　number　of　the　thermoelectric　cooling　modules,　inlet　temperature,　humidity　ratio　and　velocity　of　the　primary　air　are　also　investigated.　©　2019　International　Institute　of　Refrigeration.　All　rights　reserved.