G316 LiBr CONCENTRATION DISTRIBUTION IN A FALLING-FILM TYPE ABSORBER MEASURED BY A REFRACTOMETER(Absorption heat pump)

概要

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An experimental study of the LiBr concentration in an falling-film-type absorber was carried out to find out the optimum operating conditions for improving the heat and mass transfer in lithium bromide(LiBr)-water absorption heat pumps. An experimental apparatus for an absorber with a staggered bundle of horizontal tubes was designed, fabricated, and tested. The LiBr-water solution was extracted from the apparatus using vacuum sampling ports. The experimental results show that the difference in LiBr concentration between the inlet and the outlet of the absorber was increased by the maximum 10 percent with increasing surfactant concentration up to 3,000 ppm. The vapor absorption by the solution starts at the second row of tubes and increases gradually between the row and the fourth rows, which can be explained by the enhanced absorption thanks to the gradual decrease in the solution temperature. However the absorption of the vapor decreases from the fifth row to the end of the absorber, where the solution temperature remains relatively constant and the LiBr concentration decreases gradually.
一般社団法人日本機械学会の論文
2000-10-01