Abstract
The objectives of this paper are to investigate the effects of surfactant and surface roughness on absorption performance, to apply binary nanofluid to the absorption system, and to compare the effects of three technologies on absorption performance. In order to compare the effect of surface roughness and that of surfactant, two micro-scale hatched tubes and a bare tube are tested on the H2O/LiBr falling film absorber with the addition of n-Octanol 400 ppm in the first experiment. The effect of binary nanofluid is compared with that of surfactant on NH3/H2O bubble absorption performance in the second experiment. The results show that the absorption performance for the micro-scale hatched tubes with surfactant becomes up to 4.5 times higher than that for the bare tube without additive, the addition of 2-Ethyl-1-Hexanol 700 ppm can enhance the NH3 absorption rate 4.8 times, and the addition of Cu nano-particles 0.1 wt% can enhance it 3.2 times. It is concluded that the absorption enhancement by the surfactant is more significant than that by the micro-scale hatched tubes in the H2O/LiBr falling film absorber, and the effect of nano-particles on the absorption performance is comparable to that of surfactant in the NH3/H2O bubble absorber.
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