Numerical modeling of incline plate LiBr absorber |
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Authors: | Shahram Karami Bijan Farhanieh |
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Institution: | (1) School of Mechanical Engineering, Sharif University of Technology, 11155-9567, Tehran, Iran |
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Abstract: | Among major components of LiBr–H2O absorption chillers is the absorber, which has a direct effect on the chillier size and whose characteristics have significant
effects on the overall efficiency of absorption machines. In this article, heat and mass transfer process in absorption of
refrigerant vapor into a lithium bromide solution of water-cooled incline plate absorber in the Reynolds number range of 5 < Re < 150 is performed numerically. The boundary layer assumptions are used for the mass, momentum and energy transport equations
and the fully implicit finite difference method is employed to solve the governing equations. Dependence of lithium bromide
aqueous properties to the temperature and concentration is employed as well as dependence of film thickness to vapor absorption.
An analysis for linear distribution of wall temperature condition carries out to investigate the reliability of the present
numerical method through comparing with previous investigation. The effect of plate angle on heat and mass transfer parameters
is investigated and the results show that absorption mass flux and heat and mass transfer coefficient increase as the angle
of the plate increase. The main parameters of absorber design, namely Nusselt and Sherwood numbers, are correlated as a function
of Reynolds Number and the plate angle. |
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Keywords: | |
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