小型无泵溴化锂吸收式制冷系统的实验研究

建立了小型太阳能热水型无泵溴化锂吸收式制冷系统，系统主要采用降膜吸收器、降膜蒸发器、弦月型通道热虹吸提升管等新型设计。为了提高制冷系统的整体运行效果，首次设计了一套二次发生装置，使系统能在较低的初始溶液浓度范围（46％～54％）下运行，并保持较高的放气范围和吸收率，有助于提高吸收器性能；并使冷剂水产量较之不使用二次发生器的情况增大1．68倍，明显改善了蒸发效果；对冷凝器与蒸发器间压差的建立也起到一定的作用，改善了制冷系统的整体运行性能，平均制冷系数可达0．725。

Experimental Research on Compact Pump-free LiBr Absorption Refrigeration System

A compact solar pump-free LiBr absorption refrigeration system was set up with new-style devices such as falling film absorber,falling film evaporator,lunate thermosiphon elevation tube. In order to improve the performance of the whole system,a second generator was designed to maintain the higher differential concentration and absorptivity in lower initial solution concentration (46%-54%) and to enhance the performance of absorber. The yield of distilled water increases by 1.68 times as compared with that of the system without a second generator . The second generator also helps increase the pressure difference between the evaporator and the condenser to improve the performance of the whole cycle. The average coefficient of performance (COP) reaches up to 0.725.