The effect of mono nano Ag on the heat transfer and mass transfer characteristics in NH3/H2O bubble absorption process is studied.The experiments show that the concentration of mono nano Ag in the nanofluid and the concentration of ammonia in the base-fluid are the key parameters.The temperature of solution with mono nano Ag in the absorber is higher than that without any additives.In the mono nano Ag concentration range of 0.005%—0.020%

the effective absorption ratio is always higher than 1.0 and gets larger with the increase in the initial ammonia concentration

and both the absorption rate and effective absorption ratio increase with the mono nano Ag concentration.It is also found that the effective absorption ratio can reach the maximum 1.55 when the initial ammonia concentration is 20% and the mono nano Ag concentration is 0.020%.Therefore

it can be concluded that the addition of mono nano Ag enhances significantly the absorption in the ammonia bubble absorption process.The possible mechanisms for the phenomena in experiments and related results are also explained.