Thermoacoustic technology is a promising approach for environmentally-friendly, low-cost heat pumping. Here, we present experiments demonstrating an acoustic-driven phase-change heat pump, and a theoretical performance analysis. An experimental setup was constructed and tested, employing a binary mixture of an ‘inert’ and a ‘reactive’ component as the working fluid. In such a system, the reactive component undergoes evaporation and condensation as part of the acoustic cycle, resulting in latent heat transfer that augments the overall heat flux. In order to further characterize the performance of such a system, a mathematical model of the thermoacoustic heat pump was employed. Experiments generally demonstrate that a larger cooling power and a higher COP can be obtained with phase change, compared with a classical system. However, this enhancement is only maintained as long as the temperature difference does not exceed a ’critical’ value. Otherwise, the time-averaged mass flux reverses its direction and thereafter carries heat against the heat pumping direction. This critical temperature difference is proportional to the value of the local acoustic impedance. We found that increasing the acoustic impedance by locally enlarging the cross-sectional area of the stack, resulted in better performance and enabled an increased temperature difference. Further, a high concentration of the reactive component is required for efficient operation. For instance, a COP above 40% of the Carnot COP can theoretically be obtained when the heat pump is operated with isopropanol at a concentration of $~$0.8, at a temperature difference of $30°\mathrm{C}$.

热声技术是环保，低成本热泵的一种有前途的方法。在这里，我们提出了演示声驱动相变热泵的实验以及理论性能分析。使用“惰性”和“反应性”组分的二元混合物作为工作流体，构建并测试了实验装置。在这样的系统中，作为声波循环的一部分，反应性成分会发生蒸发和冷凝，从而导致潜热传递，从而增加了总体热通量。为了进一步表征这种系统的性能，采用了热声热泵的数学模型。实验通常表明，更大的冷却功率和更高的COP与经典系统相比，可以通过相变获得。但是，只有温度差不超过“临界”值时，才能保持这种增强。否则，时间平均质量通量会反转其方向，然后沿热泵方向传热。该临界温度差与局部声阻抗的值成比例。我们发现，通过局部增大堆栈的横截面积来增加声阻抗，会导致更好的性能并增加温差。此外，为了有效操作需要高浓度的反应性组分。例如，当热泵使用异丙醇浓度为时，理论上可以获得比卡诺COP高40％的COP。$〜$温度差为0.8时 $30°\mathrm{C}$。