01-JIJR-heat transfer characteristics of R410A-oil mixture in 7 mm microfin tube.pdfVIP

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01-JIJR-heat transfer characteristics of R410A-oil mixture in 7 mm microfin tube.pdf

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01-JIJR-heat transfer characteristics of R410A-oil mixture in 7 mm microfin tube

i n t e r n a t i o n a l j o u r n a l o f r e f r i g e r a t i o n 3 1 ( 2 0 0 8 ) 1 0 8 1 – 1 0 9 3www. i ifi i r .org ava i lab le at www.sc iencedi rec t . com journa l homepage : www.e lsev i er . com/ loca te / i j r e f r igHeat transfer characteristics of R410A–oil mixture flow boiling inside a 7 mm straight microfin tubeHaitao Hua, Guoliang Dinga,*, Kaijian Wangb aInstitute of Refrigeration and Cryogenics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China bFujitsu General Institute of Air-Conditioning Technology Limited, 1116 Suenaga, Takatsu-Ku, Kawasaki 213-8502, Japana r t i c l e i n f o Article history: Received 4 October 2007 Received in revised form 6 December 2007 Accepted 9 December 2007 Published online 15 December 2007 Keywords: Heat exchanger Microfin tube Heat transfer Boiling Mixture R410A Oil Heat transfer coefficient* Corresponding author. Tel.: t86 21 3420637 E-mail address: glding@ (G. Di 0140-7007/$ – see front matter a 2007 Elsevi doi:10.1016/j.ijrefrig.2007.12.004a b s t r a c t Two-phase heat transfer characteristics of R410A–oil mixture flow boiling inside a straight microfin tube with the outside diameter of 7.0 mm were investigated experimentally. The experimental conditions include the evaporation temperature of 5 C, the mass flux from 200 to 400 kg m2 s1, the heat flux from 7.56 to 15.12 kW m2, the inlet vapor quality from 0.2 to 0.7, and nominal oil concentration from 0 to 5%. The test results show that the heat transfer coefficient of R410A–oil mixture increases with mass flux of refriger- ant–oil mixture; the presence of oil enhances the heat transfer at the range of low vapor qualities (xr,o 0.4); while at high vapor qualities (xr,o 0.65), the presence of oil deterio- rates heat transfer, and the heat transfer coefficient drops off very sharply with the increase of nominal oil concentration and vapor quality at high vapor qualities. A new correlation to predict the local heat transfer coefficient