含氢氟碳化合物(HFC)的两种二元CO2基混合物关键参数的实验研究及CO2 + HFC预测模型的修正

IF 3.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Gequn Shu , Shanzhu Hu , Hua Tian
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引用次数: 0

摘要

用变体积法确定了二氧化碳(CO2) +氟乙烷(R161)和二氧化碳(CO2) + 1,1-二氟乙烷(R152a)二元混合物的临界参数,包括临界温度和临界压力。通过观察蓝宝石图像中间气液相界面的消失和重现来确定临界点。混合物成分、临界温度和临界压力的扩展不确定度分别为0.00023、0.27 K和0.03 MPa (K = 2,置信水平为0.95)。实验结果与Peng-Robinson状态方程(PR EOS)、Helmholtz能量状态方程(HEOS)、修正扩展Chueh和Prausnitz (MECP)方法的预测结果进行了比较,证明了两种混合物预测结果的准确性。对CO2+HFC混合物的MECP方法系数进行了修正,提高了MECP方法的预测精度。利用Redlich-Kister (RK)方程对实验数据进行关联,结果与实验数据吻合较好。拟合RK方程的临界温度和临界压力的平均绝对相对偏差(AARD)分别为0.223%和0.50% (CO2/R161), 0.231%和0.255% (CO2/R152a),与实验结果基本一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental investigation on critical parameters of two binary CO2-based mixtures containing hydrofluorocarbon (HFC) and modification of the CO2 + HFC prediction model
The critical parameters of carbon dioxide (CO2) + fluoroethane (R161) and carbon dioxide (CO2) + 1,1-difluoroethane (R152a) binary mixtures, including critical temperature and critical pressure, have been determined by variable volume method. The critical point is determined by observing the disappearance and recurrence of the vapor-liquid phase interface in the middle of the sapphire image. The extended uncertainties of mixture composition, critical temperature, and critical pressure are <0.00023, 0.27 K, 0.03 MPa (k = 2, 0.95 confidence level), respectively. The experimental results are compared with the prediction results of Peng-Robinson equation of state (PR EOS), Helmholtz energy equation of state (HEOS), Modified Extended Chueh and Prausnitz (MECP) method, which prove the accuracy of the results for the two mixtures. The coefficients of the MECP method are modified for CO2+HFC mixtures, and the prediction accuracy of the method is improved. The Redlich-Kister (RK) equations are used to correlate the experimental data, and the results are in good agreement with the experimental data. The average absolute relative deviation (AARD) of the critical temperature and critical pressure fitted to the RK equation are 0.223% and 0.450% (CO2/R161), 0.231% and 0.255% (CO2/R152a), respectively, which are basically consistent with the experimental results.
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来源期刊
CiteScore
7.30
自引率
12.80%
发文量
363
审稿时长
3.7 months
期刊介绍: The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.
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