论文部分内容阅读
前言在制冷系统里,油仅在压缩机中起作用:润滑运动部分,冷却和密封。油在系统的其他部分起着不利的影响。使用氟利昂制冷剂,在油浓度低时,传热系数会增加。但当油的浓度增加到某一值时,油和氟利昂制冷剂就成可溶的。由于油在氨中实际上是不溶解的以及它的粘度在低温时是高的,它往往会粘附于管壁,形成油膜,油膜具有极高的热阻,增加了氨侧的20～80％的温差。为此,我们来讨论油洗涤器。这洗涤器主要是为氨制冷装置用的,使这氨装置中的冷凝器和蒸发器没有油,以保持好的传热。对氟利昂制冷剂,使用油洗涤器,是考虑到蒸发温度可能降低到油的流动点以下,也就是说,可避免调节孔的堵塞。油怎样进入系统
Introduction In refrigeration systems, oil functions only in compressors: lubrication of moving parts, cooling and sealing. The oil plays a detrimental effect on the rest of the system. With Freon refrigerants, the heat transfer coefficient increases when the oil concentration is low. However, as the oil concentration increases to a certain value, the oil and freon refrigerant become soluble. Because oil is virtually insoluble in ammonia and its viscosity is high at low temperatures, it tends to adhere to the tube wall to form an oil film that has a very high thermal resistance and an increase of 20-80 on the ammonia side % Of the temperature difference. To this end, we discuss the oil scrubber. This scrubber is primarily used for ammonia refrigeration units, leaving the condensers and evaporators in this ammonia unit free of oil to maintain good heat transfer. For Freon refrigerants, the use of an oil scrubber is based on the assumption that the evaporation temperature may be reduced below the oil’s flow point, ie clogging of the adjustment orifice may be avoided. How to enter the system of oil