Abstract:

An experimental rig was built and researches on the transport performance of bubble pumps with R134a/R23-DMF solutions and three lifting tubes of different inner diameters (6 mm, 8 mm and 12 mm) were conducted. On the same concentration of solutions, the results showed the gas mass flow rate and the generating temperature increased approximately linearly with the increase of the heat input, the pumping ratio decreased approximately reversely with the increase of the gas mass flow rate, and the heat input had slight effect on system pressure. The concentrations of solutions had slight effect on the pumping ratio and generating temperature, but it had obvious effect on system pressure. The pumping ratio of the bubble pump and the poor R134a/R23 solution mass flow rate with lifting tube of 8 mm inner diameter has medium variation range compared with those of 6 mm and 12 mm lifting tubes, but the range of the gas mass flow rate was the widest and the generating temperature was the lowest. It showed that the bubble pump with lifting tube of 8 mm inner diameter was appropriate for the diffusion absorption refrigerator. The experimental results will be helpful to the design of bubble pumps for the diffusion absorption refrigerator.

摘要：

搭建了气泡泵输送性能实验装置，对提升管管径为6、8、12 mm的气泡泵输送不同R134a/R23-DMF浓度溶液的性能进行实验研究。结果表明，在相同制冷剂浓度情况下，三种管径气泡泵的气相流量随着输入功率的增加均呈线性增加趋势，液气比随着气相流量的增加均呈现反向趋势，发生温度随着输入功率增加而线性升高，而输入功率对于系统压力的影响较小。在不同制冷剂浓度情况下，R134a/R23浓度对液气比的影响不明显，但对系统压力影响很大，R134a/R23浓度的增加使得发生温度有微小的升高。8 mm管径气泡泵液气比和稀溶液流量变化幅度居中，而气相流量变化范围最宽，发生温度最低，比较适合用于扩散吸收制冷系统。这些实验结果对扩散吸收制冷系统的气泡泵设计具有重要参考价值。