胡海涛 1丁国良 1黄翔超 1朱禹 1高屹峰 2郑永新 2宋吉2
作者信息
- 1. 上海交通大学制冷与低温工程研究所,上海200240
- 2. 国际铜业协会中国上海代表处,上海200020
- 折叠
摘要
Abstract
The heat transfer and pressure drop characteristics of R410A-oil mixture flow condensation inside small diameter copper tubes are performed experimentally. The test tubes include a smooth tube and a microfin tube, the diameters of which are both 5 mm. The test results show that, the presence of oil always deteriorates the heat transfer for smooth and microfin tubes, and the deterioration effects for smooth tube and microfin tube are 24.8% and 25.1%, respectively. The effects of oil on pressure drop are different for smooth tube and microfin tube. For the smooth tube, the present of oil always decrease the pressure drop, and the maximum of the decreasement effect is 19%. While for the microfin tube, when the vapor quality is smaller than 0.6, the presence of oil decreases the pressure drop by a maximum of 18%; when the vapor quality is larger than 0.6, the presence of oil increases the pressure drop by a maximum of 9%. Comparing with 5 mm smooth tube, the heat transfer coefficient and pressure drop of R410A-oil mixture flow condensation in 5 mm microfin tube increases by 60%-130% and 40%-65%, respectively, due to the presence of microfins.关键词
小管径铜管/R410A/油/冷凝/换热/压降Key words
Small diameter copper tube/R410A, Oil, Condensation, Heat transfer, Pressure drop
