混合工质扩散吸收制冷系统初步实验研究

Preliminary Study on the Performance of the Diffusion Absorption Refrigerator Operating With the Mixed Refrigerant

本文研究了一种混合工质扩散吸收制冷循环,在带溶液泵的循环实验装置上,以R23/R32/R134a为混合制冷剂,He为扩散气体,DMF(二甲基甲酰胺)为吸收剂,进行了实验研究。结果表明,高压侧混合制冷剂在回热器中进一步被低压侧混合制冷剂冷却,使其在更低的温度下液化并与He扩散蒸发,可以实现较低的蒸发温度。中间沸点组分R32可以改善系统的制冷性能,有利于较低蒸发温度的实现。本文提出的水平蛇形套管换热器用作扩散吸收系统回热器是可行的,但还需进一步改进回热器的结构,提高加工工艺和安装精度。

This paper investigated the performance of a diffusion absorption refrigerator operating with R23/R32/R134a as the mixed refrigerant,DMF（N,N-dimethylformamide） as the absorbent, helium as the auxiliary inert gas and a solution pump.The experimental results show that the high pressure mixed refrigerant can be further cooled and liquefied in the refrigerant recuperator by the low pressure mixed refrigerant,and diffuse into helium at low refrigerating temperature,then the system can reach much low refrigerating temperature,which is also benefitted from the introduce of the component R32.The feasibility of horizontal serpentine tube-in-tube recuperator in the system has been verified in experiment,but the structure of the recuperator needs to be improved as well as the processing technique and installation accuracy of the recuperator in future.