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To improve absorption chiller performance, aqueous solution of LiBr and LiI mixture at 1 : 0.7 ratio was proposed for absorbing medium since it has higher solution limit than conventional LiBr solution. But the component LiI solution has higher equilibrium pressure than LiBr solution. To investigate the absorption performance of the new liquid, experiments were carried out using horizontal pipe column. Experimental range of mass concentration was 62-66% for the mixture and 62-63% for LiBr solution. Absorption rate of LiBr solution at 62 and 63% is almost equal to mixture solution at 63% and 64% respectively. Mixture is inferior to LiBr at the same concentration. But at the maximum concentration, mixture solution has about 20 to 50% higher values than Libr solution. Surface temperature of the falling films was measured by thermal video camera and it was used to determine heat transfer coefficient and mass transfer coefficient. They are larger values for mixture solution. This is due to the smaller viscosity of the mixture solution.

Steam Absorption into Films of Aquous Solution of LiBr and LiI Mixture Falling over a Column of Horizontal Pipes