Abstract:

Absorption heat pump is one of the ways to recover low-grade heat. In a diffusion absorption heat transformer, the diffusion gas is introduced to a dual entrances and exits bubble pump, which can replace the mechanical pump to realize the full thermal drive of the heat transformer. In this paper, water-potassium formate-R134a is used as the working fluids. The pumping performance of the bubble pump with different motive head (H=0.42 m and 0.55 m), generating temperature and diffusion gas flow rate is studied experimentally. The results show that pumping ratio increases with the increase of generating temperature and motive head, or the decrease of diffusion gas flow rate. The decrease of generating temperature and diffusion gas flow rate, or the increase of motive head lead to more energy-saving system. The uncertainty of m_R, m_G and α are 0.06078 g/s, 0.06081 g/s and 1.64799, respectively. In addition, the reduction of diffusion gas flow rate leads to the increase of the gross temperature lift. These research results will be contribute to the design of bubble pump in the future.

Key words: bubble pump, thermodynamics, diffusion, absorption, pumping performance

摘要：

吸收式热泵是回收利用低品位热能的方式之一。在扩散吸收式热变换器中借由双进双出气泡泵引入扩散气体，以此代替机械泵，实现全热驱动。本文采用工质为水-甲酸钾-R134a，通过改变动力压头、发生温度和扩散气体流量，对扩散吸收式热变换器系统中气泡泵的输送性能进行动力压头分别为0.42和0.55 m的两组试验研究。其中制冷剂流量、气相流量、提升效率这3项参数的不确定度分别为0.06078 g/s、0.06081 g/s、1.64799。结果表明，提高温度与动力压头、降低扩散气体流量，均可增大气泡泵的提升效率，这些研究结果将为后续的气泡泵设计提供重要的参考依据。

关键词: 气泡泵, 热力学, 扩散, 吸收, 输送性能