Abstract
In this study, we have a numerical study on vapor absorption into aqueous LiBr solution in a liquid-gas ejector using convergent nozzle. A model of heat and mass transfer process in absorption of water vapor into a lithium bromide solution in liquid-gas ejector was developed. The model can predict vapor entrainment rate and mass fluxes. The effect of operating condition has been investigated. It has been observed that the absorption mass flux and the vapor entrainment rate increase as the mass flow rate of the inlet solution increases, the inlet solution concentration increases, the inlet solution temperature decreases and the absorber pressure increases. In our results, we get that the mass flux and vapor entrainment rate increases with the mass flow rate, inlet solution concentration, absorber pressure; the mass flux and vapor entrainment rate increases as the inlet solution temperature decreases; the mass flux rapidly decreases at first and slowly to zero value along flow direction.
Highlights
Absorption cooling systems have been widely used in central air-conditioning refrigeration because it can make use of low-grade heat and refrigerant is safe and environmentally friendly
The present study focuses on the numerical study of the heat and mass transfer process in the liquid-gas ejector using convergent nozzle
Yoon’s study focuses on the study of the combined heat and mass transfer process in a vertical plate absorber which is cooled by cooling water, even if the water vapor is absorbed, the temperature still decreases as the x increases
Summary
Absorption cooling systems have been widely used in central air-conditioning refrigeration because it can make use of low-grade heat and refrigerant is safe and environmentally friendly. The results showed that coolant side flow rate effects small on the values of mass absorbed, the outlet film temperature and the outlet mass fraction. In this study the liquid-gas ejector was used in the lithium bromide absorption refrigerator in order to improve the mass transfer efficiency.
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