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.