Advances in New and Renewable Energy >
Effects of Lift-tube Diameter on Performance of Bubble Pump with Organic Working Fluids
Received date: 2015-11-15
Revised date: 2015-12-07
Online published: 2016-02-28
As a key component in diffusion absorption refrigeration systems, the bubble pump is the motive force and has great effect on the performance and stable operation of the refrigeration unit. Based on drift-flux model, a mathematical model for the bubble pump in the diffusion absorption refrigeration system is established under MATLAB.used in the diffusion absorption refrigeration system with TFE (2,2,2-trifluoroethanol)/E181 (tetraethylene glycol dimethyl ether) mixture is used as working fluids is developed in this paper. With MATLAB, tThe effects of the lift-tube diameter on the TFE/E181 bubble pump performance, including solution mass flow rate and efficiency, have been were investigated under different submergence ratio and heating power. The results show that the TFE/E181 bubble pump performance changing with the lift-tube diameter is closely linked to the submergence ratio and heating power. When the submergence ratio ranges from 0.2 to 0.7 and heating power is between 200 W and 1200 W, there exists an optimum diameter for the lift-tube that can make the solution mass flow rate as well as efficiency of the bubble pump maximum. With the submergence ratio and heating power increased, the optimum diameter increases till it reaches slug flow’s limitation. In addition, for the lift-tube with a certain diameter, the solution mass flow rate and efficiency of the TFE/E181 bubble pump increase with the increase in the submergence ratio, but their variation trends with the increased heating power depend on the size of lift-tube diameter.
Key words： bubble pump; drift-flux model; lift-tube diameter; submergence ratio; heating power
LI Hua-shan , WANG Ling-bao , BU Xian-biao , MA Wei-bin . Effects of Lift-tube Diameter on Performance of Bubble Pump with Organic Working Fluids[J]. Advances in New and Renewable Energy, 2016 , 4(1) : 56 -61 . DOI: 10.3969/j.issn.2095-560X.2016.01.009
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