Under　high　temperature　and　humidity　conditions,　the　solution　regeneration　process　involves　significant　latent　heat　transfer.　The　ability　of　additional　heating　structures　to　transfer　latent　heat　directly　affects　mass　transfer　performance.　However,　there　has　been　limited　research　focusing　on　enhancing　heat　and　moisture　transfer　performance　through　the　thermal　effects　of　additional　structures,　and　existing　models　struggle　to　adequately　describe　this　phenomenon.　This　study　aims　to　establish　a　suitable　4NTU-Le　regeneration　model　through　experiments　and　analyze　the　enhancement　mechanism　of　fin-microchannel　thermal　effects　on　the　regeneration　process.　Fundamental　analyses　were　conducted　to　explore　the　coupling　transfer　mechanism　of　heat　and　humidity　among　air,　solution,　and　hot　water.　Based　on　this　model,　uniform　temperature　index　(IUT)　and　uniform　humidity　index　(IUH)　were　used　as　evaluation　metrics　to　analyze　the　thermal　effects　of　fin-microchannels.　The　results　show　that　the　4NTU-Le　mathematical　model　exhibits　good　accuracy　within　the　studied　conditions,　with　predicted　exit　parameter　accuracies　within　10　%.　The　thermal　effects　of　fin-microchannels　effectively　mitigate　the　temperature　decline　along　the　process　caused　by　increased　solution　release　latent　heat　due　to　higher　air　mass　flow　rates,　thereby　enhancing　along-process　equivalent　humidity　and　maintaining　uniform　distribution.　Even　when　the　solution-hot　water　inlet　temperatures　are　equal,　the　thermal　effects　of　fin-microchannels　still　increase　the　average　along-process　equivalent　humidity　of　the　solution　by　6.8　g/kg　and　decrease　IUH　by　1.9　g/kg.　At　maximum　temperature　differences　or　flow　rates,　these　effects　enhance　solution　humidity.　This　work　validates　the　accuracy　of　the　4NTU-Le　regeneration　model　through　experiments,　elucidates　the　impact　mechanism　of　fin-microchannel　thermal　effects　on　the　regeneration　process,　and　provides　insights　for　optimizing　the　performance　of　solution　regenerators.　©　2025　Elsevier　Ltd