蒸发盘管内制冷剂喷射蒸发的制冷系统研究

制冷剂高压能的利用对改善制冷系统运行有重要意义。基于场协同理论,提出了一种利用制冷剂在蒸发管内进行喷射的新型制冷系统,理论上分析了协同角随毛细管管径和喷射孔直径的变化规律,并进行了相关的可视化实验。理论分析结果表明:协同角随着喷射孔直径的增大而增大;随着毛细管管径的减小而减小,但是随之减小的速率降低。实验结果表明:和传统的毛细管节流制冷系统相比,开孔实验的制冷剂的充注量减少70%以上,COP提高了9%,系统达到稳定的时间减少了70%。

Performance of the Refrigeration System with the Refrigerant Injection from the Hole on the Capillary in the Evaporator Coil

It is interesting to improve the performance of the refrigeration system by the utilization of the high pressure refrigerant. Based on the field synergy theory, a new type of refrigeration system was provided, in which the high pressure refrigerant was injected into the evaporator coil from the hole opened on the capillary inserted in the evaporator coil. The change law of the synergy angle between the flow and heat flow along the hole diameter and the capillary diameter was analyzed theoretically. And the visual experiments were carried out. The theoretical results show that the synergy angle is reduced with the decrease of the hole diameter and the capillary diameter, but the effect of synergy angle is also reduced with the decreasing of the capillary diameter. The experimental results show that compared with the conventional refrigeration system, the refrigerant mass charge is reduced more than 70%, COP is improved about 9% and the time needed to be stable is reduced 70% in the hole opening system.