Abstract:

An experimental prototype of a single stage ammonia-water absorption chiller was designed，constructed and tested. Under operation conditions，results of the top vapour temperature，concentration and mass flow rate were measured. Based on the theories of equilibrium and non-equilibrium stages，mathematical models of the column have been assembled so as to quantify the simultaneous processes. Comparison of the calculated results with experimental data showed that the non-equilibrium model is satisfactory，in which the ammonia concentration and the temperature profile along the column height are in agreement with the experimental data. Under certain feed mass，the concentration of ammonia is increased with the increase in reflux ratio，but higher reflux ratio will have negative influence on the chiller performance.

摘要：

搭建了一台单级氨吸收式制冷机试验装置，在设计工况下稳定运行的基础上进行了氨水精馏性能实验。对氨水精馏塔分别建立了平衡级和非平衡级模型，计算结果与实验结果比较表明：采用相界面热质传递过程速率方程建立的非平衡级模型能更准确地模拟实际工况，进料量一定的情况下，塔顶回流比对液氨浓度和制冷机热力系数影响较大。