R170、R600a二元混合工质池内核态沸腾换热实验研究

Experimental Research on Nucleate Pool Boiling Heat Transfer of R170 and R600a Binary Mixtures

进行了R170/R600a二元混合工质池内核态沸腾换热的实验研究,获得了在0.3 MPa饱和压力下,不同热流密度、不同浓度配比的池内核态沸腾传热数据。实验结果表明：在各浓度配比下,壁面过热度和池内沸腾换热系数都随着热流密度的增加而增大;泡露点温差和气液相浓度差都随着R170液相组分浓度配比的增加,先增大后减小,而池内沸腾换热系数则先减小后增大。通过对沸腾换热系数实验数据与相应的经验关联式计算值的比较分析发现,Inoue关联式能够比较好的关联各浓度配比下的沸腾换热系数,其平均绝对偏差为17.3%。

Experimental studies were carried out on the nucleate pool boiling heat transfer of binary mixtures of R170 / R600 a. The heat transfer data of binary mixtures of R170 / R600 a at 0. 3MPa saturated pressure,various heat fluxes and different mixture concentrations were measured. The results showed that the wall superheat and nucleate pool boiling heat transfer coefficient increased with increasing heat fluxes at different mixture concentrations. The temperature difference between the dew and bubble point and gas-liquid phase concentration difference increased first and then decreased with increasing liquid phase concentration for R170,while the pool boiling heat transfer coefficient decreased first and then increased with increasing liquid phase concentration for R170. Some typical semi-empirical correlations were selected to compare with the measured data. As a result,the Inoue correlation showed the best predictions for the nucleate pool boiling heat transfer and yielded a 17. 3% absolute deviation.