The performance of the absorption refrigeration system depends much on the absorber. The falling film absorption and bubbleabsorption studies performedexperimentallyand numericallyfor completed absorbers. This paper focuses on evaluating the parameters affecting the coupled heat-mass transfer as NH 3 -H 2 O diluted solution flowing on horizontal round tubes absorbsNH 3 vapor to become the stronger concentratedsolution. The fields ofvelocity, temperature, concentration and thickness of the falling film solution varied by the input conditions of diluted solution and cooling water temperature flowing in the tube represented by a test volume element of thetube.The two-dimensional numerical simulation is written by the Matlab programming language to solve partial differential equations predicting absorption efficiency while changing the parameters affecting the absorption process.
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