Experimental study on flow boiling heat transfer and pressure drop of R245fa/R141b mixture in a horizontal microfin tube
作者： Zhiqi Wang , Lan Luo , Xiaoxia Xia , Ni He , Deqi Peng
DOI: 10.1016/J.IJREFRIG.2020.06.005
关键词:
摘要: Abstract The heat transfer and pressure drop characteristics of the mixture are design basis evaporators optimization Organic Rankine Cycle (ORC). As a promising for ORC systems, R245fa/R141b with different mass fractions (1/0, 0.75/0.25, 0.5/0.5, 0.25/0.75 0/1) were selected as working fluid. coefficient (HTC) frictional in horizontal microfin tube 8.6 mm equivalent diameter measured. During experimental tests, saturation is vary from 0.15 to 0.25 MPa (saturation temperature 25.3 60.5 ℃), fluxes 203.19 306.64 kg•m-2 s-1, 7 15 kW m-2. Additionally, based on empirical correlations literature, we developed correlation higher prediction accuracy. results indicate that HTC increase flux, while decrease pressure. fraction R245fa an friction R245fa/R141b. Cavallini–Kattan consistent data mean absolute deviations 16.68%. When flux less than 200 kg m-2 s-1 vapor quality 0.2, modified Dittus–Boelter can predict 87.3% points error range ±30% MAD 6.75%. drop, ±10.34% obtained by Filho correlation.
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sci-hub.st 参考文章(34)
Xiaomin Wu, Yu Zhu, Yingjie Tang, New experimental data of CO2 flow boiling in mini tube with micro fins of zero helix angle International Journal of Refrigeration. ,vol. 59, pp. 281- 294 ,(2015) , 10.1016/J.IJREFRIG.2015.08.002
CB Chiou, DC Lu, CC Chen, CM Chu, None, Heat transfer correlations of forced convective boiling for pure refrigerants in micro-fin tubes Applied Thermal Engineering. ,vol. 31, pp. 820- 826 ,(2011) , 10.1016/J.APPLTHERMALENG.2010.10.031
Rin Yun, Yongchan Kim, Kookjeong Seo, Ho Young Kim, A generalized correlation for evaporation heat transfer of refrigerants in micro-fin tubes International Journal of Heat and Mass Transfer. ,vol. 45, pp. 2003- 2010 ,(2002) , 10.1016/S0017-9310(01)00321-0
T. A. Newell, R. K. Shah, An Assessment of Refrigerant Heat Transfer, Pressure Drop, and Void Fraction Effects In Microfin Tubes Hvac&r Research. ,vol. 7, pp. 125- 153 ,(2001) , 10.1080/10789669.2001.10391267
Jin Min Cho, Yong Jin Kim, Min Soo Kim, Experimental studies on the evaporative heat transfer and pressure drop of CO2 and CO2/propane mixtures flowing upward in smooth and micro-fin tubes with outer diameter of 5 mm for an inclination angle of 45° International Journal of Refrigeration-revue Internationale Du Froid. ,vol. 33, pp. 922- 931 ,(2010) , 10.1016/J.IJREFRIG.2010.02.002
Chao He, Chao Liu, Hong Gao, Hui Xie, Yourong Li, Shuangying Wu, Jinliang Xu, The optimal evaporation temperature and working fluids for subcritical organic Rankine cycle Energy. ,vol. 38, pp. 136- 143 ,(2012) , 10.1016/J.ENERGY.2011.12.022
S.Z Rouhani, E Axelsson, CALCULATION OF VOID VOLUME FRACTION IN THE SUBCOOLED AND QUALITY BOILING REGIONS International Journal of Heat and Mass Transfer. ,vol. 13, pp. 383- 393 ,(1970) , 10.1016/0017-9310(70)90114-6
Chieko Kondou, Daisuke BaBa, Fumiya Mishima, Shigeru Koyama, Flow boiling of non-azeotropic mixture R32/R1234ze(E) in horizontal microfin tubes International Journal of Refrigeration-revue Internationale Du Froid. ,vol. 36, pp. 2366- 2378 ,(2013) , 10.1016/J.IJREFRIG.2013.07.009
Xiaohong Han, Peng Li, Zheng Wang, Xuehui Wang, Xuejun Zhang, Guangming Chen, Evaporation heat transfer and pressure drop of R161 in a 7mm micro-fin tube International Journal of Heat and Mass Transfer. ,vol. 62, pp. 638- 646 ,(2013) , 10.1016/J.IJHEATMASSTRANSFER.2013.03.017
Xiaoyan Zhang, Xiuling Yuan, Heat transfer correlations for evaporation of refrigerant mixtures flowing inside horizontal microfin tubes Energy Conversion and Management. ,vol. 49, pp. 3198- 3204 ,(2008) , 10.1016/J.ENCONMAN.2008.05.018