Effect of Thermal Cycling under Load on Martensite Transformation and Two-way Shape Memory Effect in a TiNi Alloy

The effect of thermal cycling under loading on martensitic transformation and two-way shape memory effect was investigated for Ti-49.8 at, pet Ni alloy. It is shown that M(s), and M(f) temperature increase with increasing the number of cycles, while A(s) and A(f) temperature decrease during thermal cycling. The total strain at and permanent strain epsilon (p) increase with increasing applied stress and number of cycles. The two-way shape memory effect can be improved by proper thermal cycling training under loading, while excessively high applied stress results in the deterioration of TWSME. The reason for the changes in martensitic transformation characteristics and two-way shape memory effect during thermal cycling under loading is discussed based on the analysis of microstructure by TEM observations.

电子膨胀阀对远置冷凝机组冷藏陈列柜能效的影响

在远置冷凝机组冷藏陈列柜的电能消耗实验中，分别安装电子膨胀阀与热力膨胀阀对冷藏陈列柜进行控制，对比耗电量。实验结果表明，在电子膨胀阀控制下的冷藏陈列柜耗电量略高于在热力膨胀阀控制下的耗电量，如何在冷藏陈列柜中使用电子膨胀阀时提高能效，需要做进一步的研究。

电动汽车热泵空调用双向热力膨胀阀设计

传统电动汽车空调存在制热效率低、影响汽车续航里程等缺陷,热泵空调系统是电动汽车空调发展的一个必然趋势,其关键是节流元件的选择。本文介绍的电动汽车热泵空调用双向热力膨胀阀是在现有热力膨胀阀的基础上,针对电动汽车热泵空调的特点,采用全封闭结构、二次节流、圆锥形阀芯阀口、双向工作的内密封结构等技术,解决热泵空调制冷和制热时热力膨胀阀制冷剂双向流通、流量平衡及可靠性等问题。