变频空调器制冷系统的模拟研究

通过建立包含滚动转子压缩机工作过程热力学模型在内的变频空调器制冷系统数学模型，并根据变频空调器带有低压储液器的制冷系统的特点，提出了以制冷剂充灌量和储液器出口过热度相结合的系统模拟计算收敛条件。同时利用本模型，进行了变频空调器制冷系统在不同充灌量时的性能研究，并提出了变频空调器最佳充灌量的确定原则。     

Convective Boiling of Near-Azeotropic Refrigerant R410A in the Horizontal Micro-fin Tube

Using near-azeotropic refrigerant R410A as the working fluid, the experimental studies on the horizontal micro-fin tubes were conducted. Several factors affecting heat transfer coefficients were analyzed, and the characteristics of flow boiling of the refrigerant in the horizontal micro-fin tubes were discussed. The local heat transfer coefficients increase with mass flux, heat flux and quality. And the heat transfer enhancement factor of those testing tubes is about 1.6 to 2.2.     

制冷剂蒸汽压图和蒸汽压表在汽车空调维修中的运用

如今,暖通空调系统为人们的舒适和福祉作出了重要的贡献,它们渐渐变得几乎无处不在。车辆气候控制系统为乘客舒适作出了重要贡献,并且通过帮助驾驶员保持对路况的关注,为安全也作出了贡献。在当今高档豪华汽车上,这些额外的舒适功能现在对大众而言已不可或缺,因而系统也需要具备最高级别的性能和可靠性。这种可靠性只能通过正确的保养和诊断方法来实现。空调系统的诊断技术和方法已经被前辈总结的很具体了,但很少有维修技师在维修汽车空调是运用制冷剂蒸汽压图和蒸汽压表。