Theoretical and experimental study on heat and mass transfer of H₂O/LiBr falling-film absorber

This thesis presents a theoretical and experimental study on heat and mass transfer in a H₂O/LiBr falling-film absorber, a key component in absorption cooling systems. A simplified analytical model is developed that accounts for film hydrodynamics, partial wetting, and coupled heat and mass transfer, providing practical design expressions. The model's predictions are validated through experiments on horizontal tube bundle absorber developed at the department of Technical Thermodynamics of the University of Kassel, Germany. The results highlight how controlling film stability and surface coverage significantly enhances absorber efficiency.