新工质 R134a 在水平强化管外的池沸腾换热

Pool Boiling of R134a outside a Horizontal Enhanced Tube

对新型替代工质Ｒ１３４ａ在水平强化管外的核态池沸腾换热进行了实验研究．查明了热流密度、蒸发压力和沸腾换热系数的关系，拟合了适合于本强化管的沸腾换热系数计算式．并对Ｒ２２和Ｒ１３４ａ在强化管外池沸腾换热的特性进行了对比．

Pool boiling outside a horizontal enhanced tube with the new refrigerant R134a was experimentally investigated. The correlation among the heat transfer coefficient, heat flux and saturation pressure was obtained by using the multi variables linear least square method. The enhancement cha racteristics of heat transfer coefficient of the enhanced tube against smooth tube were also analyzed. The results showed that for the enhanced tube studied the boiling heat transfer coefficients of R134a is lower than that of R22.