Numerical analysis of the enhancement of ammonia-water falling film absorption process by atomized equipment

2021 ◽  
Author(s):  
Runfa Zhou ◽  
Minqi Wang ◽  
Yunyu He ◽  
Al-Kbodi Basher Hassan ◽  
Shuhong Li
Keyword(s):  
Numerical Analysis ◽  
Falling Film ◽  
Absorption Process ◽  
Ammonia Water ◽  
Falling Film Absorption ◽  
Film Absorption

Effect of Nanoparticles on H2O/LiBr Falling Film Absorption Process

2016 ◽  
Author(s):  
L. Y. Zhang ◽  
Y. Li ◽  
Y. Wang ◽  
L. X. Cao ◽  
X. Z. Meng
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Fe3o4 Nanoparticles ◽  
Falling Film ◽  
Absorption Process ◽  
Nanoparticle Concentration ◽  
Water Vapor Absorption ◽  
Libr Solution ◽  
Falling Film Absorption ◽  
Film Absorption

Absorber is an important component in absorption refrigerating system. Its performance plays a significant role on the overall efficiency of absorption refrigerating system. The nanofluids which can enhance the heat and mass transfer will be utilized to absorber for enhancing the water vapor absorption process and improving the absorber efficiency. The software CFD-FLUENT is used to analyze the falling film absorption process of the nanofluids, which consists of H2O/LiBr solution with Fe3O4 nanoparticles in this paper. The results indicate that the enhancing heat and mass transfer of nanofluids is related to the nanoparticle concentration and size. The stronger the nanoparticle concentration, the greater enhancement of heat and mass transfer of falling film; while the smaller the nanoparticle size, the greater enhancement of heat and mass transfer of falling film. It is also found that the enhancement ratio of heat and mass transfer flux reach 1.48 and 1.37, respectively, as the Fe3O4 nanoparticles mass concentration of 0.01wt% and the size of 50nm.

In Silico Modeling of a Novel Refrigeration Process of the Ammonia–Water Falling-Film Absorption

2019 ◽  
Vol 59 (3) ◽  
pp. 1362-1373
Author(s):  
Yichen Li ◽  
Renxing Wei ◽  
Ruiying Zhang ◽  
Weifeng Shen ◽  
Saimeng Jin
Keyword(s):  
In Silico ◽  
Falling Film ◽  
Ammonia Water ◽  
In Silico Modeling ◽  
Falling Film Absorption ◽  
Film Absorption

Combined Heat and Mass Transfer Under Different Inlet Subcooling Modes During NH3-H2O Falling Film Absorption Process

2001 ◽  
Vol 123 (3) ◽  
pp. 242-249 ◽  
Author(s):  
Y. T. Kang ◽  
Y. Fujita ◽  
T. Kashiwagi
Keyword(s):  
Heat Transfer ◽  
Water Absorption ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Falling Film ◽  
Absorption Process ◽  
Concentration Difference ◽  
Ammonia Water ◽  
Absorption Performance ◽  
Falling Film Absorption

Experiments were conducted for ammonia-water falling film absorption in a plate heat exchanger with offset strip fins. The objectives of this paper were to analyze combined heat and mass transfer during the ammonia-water absorption process under different inlet subcooling modes, and to obtain heat transfer coefficients (Nusselt number). This paper examined the effects of the inlet subcooling modes, the inlet concentration difference, liquid Reynolds number, and vapor Reynolds number on the heat transfer performance. Inlet liquid concentrations were set at 0, 5, 10, and 15 percent in mass of ammonia, while inlet vapor concentration ranged from 64.7 to 83.6 percent. Experiments were conducted in three ways according to the inlet subcooling conditions, i.e., Case A Tv>Tl, Case B Tv∼Tl, and Case C Tv<Tl. In Case A, there was a rectification process at the top of the test section by the inlet subcooling effect. Water desorption was confirmed in the experiments, which resulted in a lower absorption performance. The heat transfer coefficient increased as the inlet subcooling increased in all cases. The effect of inlet subcooling on heat transfer performance was more significant in Case A than in Cases B and C. The inlet subcooling had more significant effect on the heat transfer performance than the inlet concentration difference. Nusselt number increased as liquid and vapor Reynolds numbers increased. The vapor velocity should be maximized to increase absorption performance in cocurrent ammonia-water absorption process. The parametric analysis provides fundamental understandings of the ammonia-water absorption process, and thus gives a guideline for heat exchanger compactness in ammonia-water absorption systems.

Experimental study on enhancement of ammonia–water falling film absorption by adding nano-particles

2011 ◽  
Vol 34 (3) ◽  
pp. 640-647 ◽  
Author(s):  
Liu Yang ◽  
Kai Du ◽  
Xiao Feng Niu ◽  
Bo Cheng ◽  
Yun Feng Jiang
Keyword(s):  
Experimental Study ◽  
Nano Particles ◽  
Falling Film ◽  
Ammonia Water ◽  
Falling Film Absorption ◽  
Film Absorption
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