润滑油在CO2冷剂系统中的溶解能力及传热研究分析

介绍了润滑油在CO2空调系统中的作用.从CO2的介电常数、密度和扩散系数等方面,分析了超临界状态CO2的溶剂能力,得出了超临界状态CO2溶解非极性润滑油的能力较常态下CO2有较大提高,以及通过在CO2制冷系统中加入少量的共溶物质,可大大增加润滑油在CO2中溶解度,增加其互溶性,保证超临界状态下的CO2制冷系统的正常运行;结合国内外学者的研究结果,提出酯类合成冷冻机油POE较适合CO2冷剂系统;同时还对"润滑油对CO2冷剂系统传热性能影响"的国内外研究现状进行了分析,指出了有待进一步研究的问题.

The State-of-art about Lubricants Influencing on Heat Transfer and Dissolving Capacity of SC-CO2

As a natural and environmentally favorable fluid, carbon dioxide has gained more attention recently.This paper gives a lubricants' function in CO2 air conditioning system,concludes that CO2 can dissolve non-polar lubricants from its properties,such as dielectric constant,density and diffusion coefficient and the pop lubricants,are POE.The best way to improve SC-CO2 dissolving capacity is to put some minim impregnates.Simultaneously,this paper analyses present researches "lubricants influence on heat transfer in carbon dioxide heat pump systems" in home and abroad.Some problems that lubricants influencing on SC-CO2 unsolved are also analyzed.