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| The Influence of Oil on Pressure Drop of R410A Flow Condensation in Small Diameter Microfin Tube |
| HU Hai-Tao-1, HUANG Xiang-Chao-1, DING Guo-Liang-1, DENG Bin-2, ZHENG Yong-Xin-3, GAO Yi-Feng-3, SONG Ji-3 |
| (1. Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Shanghai R&D Center, Golden Dragon Precise Copper Tube Group Inc., Shanghai 200135, China; 3. International Copper Association Shanghai Office, Shanghai 200020, China) |
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Abstract The pressure drop characteristics of R410Aoil mixture flow condensation inside a small diameter microfin tube were investigated experimentally, and the effect of oil on frictional pressure drop was analyzed. The results show that, when the vapor quality is lower than 0.6, the presence of oil decreases the condensation frictional pressure drop of R410A, and the decrement can reach up to 12% at the present test conditions; when the vapor quality is higher than 0.6, the presence of oil increases the condensation frictional pressure drop of R410A, and the increment can reach up to 13% at the present test conditions. A new correlation of frictional pressure drop for R410Aoil mixture flow condensation inside small diameter microfin tubes was developed based on the mixture properties, and it can agree with 94% of the experimental data within a deviation of ±30%.
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Received: 14 March 2011
Published: 28 April 2012
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