According to double membrane mass transfer model of falling film absorption

change law and transport mechanism were analyzed on related physical quantities during ammonia’s heat

mass and momentum transfer process. Energy and mass conservation equations were established for ammonia gas falling film absorption

and equations discretization was made. Subsequently Gauss-Seidel iterative method was used to solve these equations. Variation curve of aqua ammonia solution mass fraction along falling film tube height was obtained about smooth tube(SMT) and transversally grooved tube(TGT). The temperature of aqua ammonia and cooling water at different dimensionless height was obtained for falling film absorption of transversally grooved tube. TGT has strong falling film absorption performance in the same conditions compared with that of SMT. Absorptive capacity in winter and summer season increased by 118.5% and 167.7% respectively. The experimental results showed that the predicted temperatures of aqua ammonia and cooling water agree well with the measured temperature in the falling film absorption process.