论文成果
Pressure drop of R134a and R1234ze(E) during condensation in horizontal microchannel arrays cooled symmetrically and asymmetrically
摘要:An experimental investigation was conducted for pressure drop of R134a and R1234ze(E) condensing in horizontal oval microchannel arrays with a hydraulic diameter of 301.6 gm, an aspect ratio of 2.46 and a length of 50 mm. The refrigerant saturation temperatures of 31 degrees C, 37 degrees C, 41 degrees C and 45 degrees C, mass fluxes of 60, 120, 180, 250 kg/(m(2)s), qualities of 0.1-0.9 were taken into account and their effects on the frictional pressure drop were analyzed. Specially, the effects of microchannel arrays cooling methods, including symmetric cooling and asymmetric cooling, were studied. The frictional pressure drops of R134a and R1234ze(E) were compared. The results showed that the frictional pressure drop increases with increasing mass flux, inlet quality and cooling water inlet temperature, and decreases with increasing refrigerant saturation temperature. The frictional pressure drop under symmetric cooling is lower than that under asymmetric cooling. The frictional pressure drop of R134a is slightly lower than that of R1234ze(E) for higher mass fluxes and inlet qualities. Six available correlations in the literature were used to predict the present data. All the correlations underestimated the data with the correlation given by Cavallini et al. (2002) having the lowest prediction error.
关键字:Condensation Pressure drop Microchannel Refrigerant Symmetric and asymmetric cooling
ISSN号:0894-1777
卷、期、页:卷: 96 页: 266-283
发表日期:2018-09-01
影响因子:2.830000
期刊分区(SCI为中科院分区):三区
收录情况:SCIE(科学引文索引网络版)
发表期刊名称:EXPERIMENTAL THERMAL AND FLUID SCIENCE
参与作者:Li, Jun Ming
第一作者:王吉
论文类型:期刊论文
论文概要:王吉,Li, Jun Ming,Pressure drop of R134a and R1234ze(E) during condensation in horizontal microchannel arrays cooled symmetrically and asymmetrically,EXPERIMENTAL THERMAL AND FLUID SCIENCE,2018,卷: 96 页: 266-283
论文题目:Pressure drop of R134a and R1234ze(E) during condensation in horizontal microchannel arrays cooled symmetrically and asymmetrically