Study on High Performance Absorption Heat Pump for the Use of Low Temperature Waste Heat

为了提高吸收式热泵利用低温余热的性能，提出了一种新的强化溴化锂水溶液吸收水蒸气的方法。水平传热管的底部附有铜板。当吸收性液体膜沿着板向下流动时，板能够实现额外的蒸汽吸收。实验研究了该方法的强化效果，发现在相对小的液体流量区域，板片对吸收有强化作用。此外，将该方法应用于回热器，获得了与吸收器相近的性能。根据吸收率的实验数据，对两级吸收式热泵的性能进行了分析，明确了两级吸收式热泵的最佳运行工况。

In order to improve the performance of absorption heat pump for the use of low temperature waste heat, a new enhancement method of water vapor absorption into LiBr/water solution was proposed. A copper plate is attached to the bottom of horizontal heat transfer tube. The plate enables additional vapor absorption when the absorbent liquid film flows down along the plate. The enhancement effect of the proposed method was investigated experimentally, and it was found that the absorption is enhanced by the plate in the region of relatively small liquid flow rate. In addition, the proposed method was applied to regenerator, and nearly the same performance was obtained as that of absorber. Based on the experimental data of absorption rate, the performance of two-stage absorption heat pump was analyzed, and the optimum operating condition was clarified.