试验研究UF(Upward Flow,制冷剂在微通道蒸发器中自下而上流动)和DF(Downward Flow,制冷剂在微通道蒸发器中自上而下流动)2种制冷剂流动方式下微通道房间空调器的制冷性能,并对其名义制冷工况下制冷剂配液分布进行红外成像.试验结果表明,随着室内空气干球温度的上升,2种方式的制冷量和能效比均不断上升；名义制冷工况下,UF方式优于DF方式,前者的制冷量和能效比EER比后者分别高出21.52%和14.94%；红外成像分析表明,UF方式分液效果优于DF方式.但是,UF方式蒸发器尾部制冷剂分配较少,换热效果下降.%Experimental comparison on the performance is conducted between Upward Flow( the refrigerant flows from down to up) and Downward Flow( the refrigerant flows from up to down) in a room air conditioner using micro-channel evaporator. Refrigerant distribution of nominal refrigeration condition in the micro-channels is made in infrared thermographs. Experi-mental results show that the cooling capacity and EER improve with the increase of ambient temperatures. Experimental re-sults reveal a mean increase of 21.52% in cooling capacity and an increase of 14.94% in EER in the unit using UF model than that using DF model under nominal refrigeration condition. The infrared thermographs elaborate that UF model is supe-rior to DF. However,refrigerant distribution in the latter tubes becomes worse,which deserves more effort.
展开▼
