Journal ArticleDOI
A study on numerical simulations and experiments for mass transfer in bubble mode absorber of ammonia and water
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In this paper, both the numerical and experimental analyses in the absorption process of a bubble mode absorber were performed, where gas was injected into the bottom of the absorber at a constant solution flow rate.Abstract:
An absorber is a major component in the absorption refrigeration systems, and its performance greatly affects the overall system performance. In this study, both the numerical and experimental analyses in the absorption process of a bubble mode absorber were performed. Gas was injected into the bottom of the absorber at a constant solution flow rate. The region of gas absorption was estimated by both numerical and experimental analyses. A higher gas flow rate increases the region of gas absorption. As the temperature and concentration of the input solution decrease, the region of gas absorption decreases. In addition, the absorption performance of the countercurrent flow was superior to that of cocurrent. Mathematical modeling equations were derived from the material balance for the gas and liquid phases based on neglecting the heat and mass transfer of water from liquid to gas phase. A comparison of the model simulation and experimental results shows similar values. This means that this numerical model can be applied for design of a bubble mode absorber.read more
Citations
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Journal ArticleDOI
Ammonia-water absorption in vertical tubular absorbers
TL;DR: In this article, the authors presented a detailed analysis of the heat and mass transfer processes during the absorption of ammonia into water in a co-current vertical tubular absorber, where the absorption process progresses as the vapour and liquid contact inside the tubes.
Journal ArticleDOI
Comparison of the performance of falling film and bubble absorbers for air-cooled absorption systems
TL;DR: In this paper, two types of air-cooled absorber have been modelled: (i) falling film flow; (ii) bubble flow, and two models have been validated with experimental data obtained from a developed testing device and published numerical results of other authors from another model.
Journal ArticleDOI
Comparison of numerical and experimental performance criteria of an ammonia–water bubble absorber using plate heat exchangers
TL;DR: In this article, a mathematical model for ammonia-water bubble absorbers was developed and compared with experimental data using a plate heat exchanger, and the analysis was performed carrying out a sensitive study of selected operation parameters on the absorber thermal load and mass absorption flux.
Journal ArticleDOI
Development of bubble absorption refrigeration technology: A review
Xi Wu,Shiming Xu,Mengnan Jiang +2 more
TL;DR: In this paper, the development of bubble absorption refrigeration technologies is discussed from the aspects of driving energies, performance enhancement and application extension, and methods of enhancing bubble absorption performance were researched, and also the influence mechanisms of these physical and chemical methods were explained.
Journal ArticleDOI
Numerical design of ammonia bubble absorber applying binary nanofluids and surfactants
TL;DR: In this paper, the authors analyzed the combined heat and mass transfer characteristics for the ammonia bubble absorption process and studied the effects of binary nanofluids and surfactants on the absorber size.
References
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Book
Mass-transfer operations
TL;DR: In this article, the Mass Transfer Coefficients for Moleuclar Diffusion in Fluids and Interphase Mass Transfer in Solid-Fluid Operations are presented. But they do not consider the effect of ion exchange in solids.
Journal Article
Ammonia-water bubble absorber with a plate heat exchanger
TL;DR: In this paper, the authors developed a design model for a bubble absorber with plate heat exchangers and evaluated the heat and mass transfer resistances within both liquid and bubble, and found that the mass transfer area was more significant on the size of the bubble than the heat transfer area.
Journal ArticleDOI
Combined heat and mass transfer during bubble absorption in binary solutions
TL;DR: In this article, the authors describe bubble behavior from inception to collapse as it translates inside a subcooled liquid binary solution, using a finite difference method to solve the governing equations and their associated boundary conditions.
Journal Article
Model of an ammonia-water bubble absorber
TL;DR: In this paper, a model of the absorption process in an ammonia-water vertical-tube bubble absorber is presented, which consists of five ordinary, first-order differential equations with appropriate inlet and interface conditions.
Journal ArticleDOI
Analysis of a bubble absorber working with R22 and five organic absorbents
TL;DR: In this paper, a model of the absorption process in a vertical tubular bubble absorber working with R22-DMF, R 22-DMA, R22 -DMETEG and R 22 -NMP is developed using finite element method employing Galerkin's technique.