Numerical study on heat and mass transfer behavior of pool boiling in LiBr/H2O absorption chiller generator considering different tube surfaces

Investigating the pool boiling process in absorption chiller generator by studying valid parameters may enhance chiller?s COP. In present study, transient 2-D numerical modelling of LiBr/H2O solution was carried out using two-phase Eulerian-Eulerian approach, extended Rensselaer Polytechnic Institute model and renormalization group k-? turbulence model. The applied on three types bare, notched fin, low fin tubes to investigate effect heat transfer rate comparing it with bare tube. Moreover, results were compared data obtained from previous experimental studies validate modelling. A good agreement achieved between results. showed evaporation mechanisms microlayer, three-phase (liquid-vapor-solid) contact line, conduction superheat layer for constant thermal flux surfaces copper tube within a specific period point solution. also that use fin-tube increases non-homogeneous nucleation rate, causes boil earlier than tube, reduces required energy an chiller.