点击次数：

论文类型：期刊论文

发表时间：2020-04-01

发表刊物：INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID

收录刊物：EI、SCIE

卷号：112

页面范围：303-313

ISSN号：0140-7007

关键字：R124-NMP mixture; Heat transfer; Mass transfer; Bubble absorber; Dimensionless correlations

摘要：An experimental study on heat and mass transfer characteristics of R124-NMP in a vertical glass bubble absorber has been conducted under operating conditions of air-cooled absorption system. The key operation parameters, solution volumetric flow rate, temperature and mass fraction at the absorption tube entrance, vapor volumetric flow rate, orifice diameter and absorption pressure, are converted into dimensionless numbers. A sensitive study of the key operation parameters on overall heat and mass transfer coefficients and two-phase mass transfer coefficient has been performed. The overall heat and mass transfer coefficients and two-phase mass transfer coefficient increase as Re-v and absorption pressure increase and decrease as orifice diameter increases. The overall heat transfer coefficient increases as Re-s increases and decreases as solution temperature and mass fraction increase. This trend is reversed for overall mass transfer coefficient. The increase of solution inlet mass fraction can improve the two-phase mass transfer coefficient while the solution inlet temperature affects the two-phase mass transfer coefficient slightly. On the basis of the experimental data, dimensionless empirical correlations for overall and two-phase Sherwood numbers are proposed with error bands of +/- 10% to calculate the volumetric mass transfer coefficient for R124-NMP bubble absorption process in a vertical bubble absorber. (C) 2020 Elsevier Ltd and IIR. All rights reserved.