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近年来,低GWP值制冷剂R1234ze(E)(trans-1,3,3,3-tetrafluoropropene)作为R134a较为理想的替代品而被广泛关注。本文对R1234ze(E)在内径为8 mm水平圆管内流动沸腾换热特性进行实验研究,实验研究的流动沸腾换热的饱和温度为20°C,热流密度范围为(7.5~15)k Wm~(-2),质流密度范围为(200~400)kgm~(-2)s~(-1),入口干度0.075~0.785,并分析质流密度、热流密度以及干度对R1234ze(E)饱和流动沸腾换热系数的影响。将本实验结果同3种预估关联式进行比较,结果表明LIU等的关联式计算结果较优,预估值与75%的实验数据误差在±30%以内,平均偏差为23.9%。
In recent years, low-GWP refrigerant R1234ze (E) (trans-1,3,3,3-tetrafluoropropene) has drawn much attention as an ideal substitute for R134a. In this paper, the experimental study on the flow boiling heat transfer characteristics of R1234ze (E) in a horizontal tube with an inner diameter of 8 mm was carried out. The experimental results show that the boiling temperature of the R1234ze (E) is 20 ° C and the heat flux density is in the range of 7.5 ~ 15kWm ~ (-2), mass flow density (200 ~ 400) kgm ~ (-2) s ~ (-1) and entrance dryness of 0.075 ~ 0.785. The effects of mass flow, heat flux and dryness on the R1234ze Influence of saturation flow boiling heat transfer coefficient. The results of the experiment are compared with the three kinds of predictive correlations. The results show that the correlation calculation results of LIU et al. Are superior. The error between the predicted value and the experimental data of 75% is within ± 30% and the average deviation is 23.9%.