Numerical Simulation Study on Falling Film Absorption of Ammonia-water-lithium Bromide Working Fluid
To study the falling film absorption characteristics of a novel ammonia-water-lithium bromide ternary working fluid and provide theoretical basis for practical engineering applications,the continuity equations,energy equations,and component balance equations for the falling film absorption of the ternary working fluid with numerical analysis methods are established in this paper.The absorption results of the ammonia-water-lithium bromide ternary working fluid are calculated through programming in MATLAB software and verified against experimental data.Furthermore,the effects of lithium bromide mass fraction,working fluid flow rate,cooling water temperature,and operating temperature on the falling film absorption performance are analyzed.The research indicates that as the lithium bromide mass fraction increases from 0%to 10%,the temperature at the liquid film outlet increases from 306.7 K to 309.5 K.However,when the lithium bromide mass fraction increases from 10%to 15%,the temperature at the liquid film outlet decreases to 308.7 K,indicating that the maximum heat absorption occurs at a lithium bromide mass fraction of 10%.When the working fluid flow rate,cooling water temperature,and operating temperature change,in most operating conditions,there is a significant mass fraction difference between the inlet and outlet solutions when the lithium bromide mass fraction is 10%,indicating that the absorption rate is fastest at this mass fraction.
Ammonia-water-lithium bromideAbsorptionMechanical propertiesNumerical simulationFalling film
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