孙杨柳++祁影霞++陈日帅++吴东



摘要: 利用基于Burnett法搭建的PVTx性质测试系统测量了混合制冷工质R1234yf/R32在温度为253~313 K范围内、R1234yf的质量分数为20%时的气相PVTx性质.详细介绍了该测量系统基于Burnett法的测量原理和PVTx性质测试系统的实验步骤,并对各种测量误差及不确定度进行了分析.根据实验数据拟合出混合制冷工质的气态维里方程,并比较了第二、第三维里系数与温度的关系.结果表明:实验数据与拟合得到的方程具有较好的一致性,为基础热物性研究和进一步研究替代制冷剂提供了详实的数据.
关键词:
R1234yf/R32; PVTx; 维里方程
中图分类号: TB 61+2;TB 61+1文献标志码: A
Experimental study on PVTx properties of mixed refrigerant R1234yf/R32
SUN Yangliu, QI Yingxia, CHEN Rishuai, WU Dong
(School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)
Abstract:
Based on Burnett method,PVTx experimental system was applied to study the gas phase PVTx property of mixed refrigerant R1234yf/R32 with mass ratio of 20%/80% in the temperature range of 253~313 K in this paper.The principle of Burnett method and experimental procedures of PVTx experiments were described in detail.The measurement error and uncertainty of the experiment were analyzed.According to the experimental data,the Virial equation of the gaseous mixed refrigerant was fitted.The results showed that the experimental data had good agreement with the fitted equation.This paper provides a detailed data for the study of alternative refrigerants and their basic thermal properties.
Keywords:
R1234yf/R32; PVTx; Virial equation
随着社会的发展和人们生活水平的提高,新能源的开发和利用是目前生活的重中之重[1].随着制冷空调行业飞速发展,对制冷剂的选取要求也格外严格,不仅要考虑保护臭氧层,而且必须积极考虑降低温室效应.按2006年欧盟法案规定[2],到2017年所有的汽车空调应采用全球变暖潜能
(GWP)小于150的制冷剂.因此,迫切需要开发出新的高效、环保制冷剂.而R1234yf(四氟丙烯)和R32(二氟甲烷)作为新一代制冷剂,在热工性能、环保特性、安全性等方面都有各自的优势.
R1234yf为低毒、微燃工质,其臭氧层破坏潜能(ODP)为0,GWP为4,大气寿命仅11 d[3],化学性能稳定.R1234yf被广泛用于代替汽车空调R134a.余鹏飞等[4]研究了R1234yf制冷系统相对于R134a制冷系统的优缺点,即压缩机排气温度低、压缩比小的优点和制冷量小、压缩机功率大的缺点.张青等[5]讨论了制冷剂R1234yf替代R22的优势.R32为微燃工质,其ODP为0,GWP为……