水平管内R245fa/R141b沸腾换热特性的实验研究

doi:10.11949/0438-1157.20190837

摘要/Abstract

摘要：

针对新型混合工质R245fa/R141b，开展水平光滑管(外径10 mm)内工质沸腾换热特性的实验研究，对比纯工质与混合工质的换热性能及4种常用关联式的预测精度。结果表明：纯工质与混合工质的沸腾传热系数均随质量流速和热通量的增加而增大，随饱和压力的增加而减小；随干度的增加，沸腾传热系数均先增大后减小，即存在“过渡干度”，且混合工质的过渡干度大于纯工质；干度小于0.55时，混合工质传热系数小于纯工质；干度大于0.55后，混合工质的传热系数更高；随R245fa质量分数的增加，混合工质的沸腾传热系数增大。在所选关联式中，Gungor-Winterton关联式能准确地预测工质在光滑管内的沸腾换热特性，平均相对误差为16.67%。

关键词: 水平光滑管, 二元混合物, 相变, 关联式, 传热

Abstract:

An experimental investigation on the boiling heat transfer of a new mixture R245fa/R141 in a 10 mm horizontal smooth tube was conducted. The boiling heat transfer performances of R245fa, R141b and their mixture were investigated, and the prediction accuracy of four commonly used correlations was compared. The results show that the boiling heat transfer coefficients of pure and mixture increase with the increase of mass flow rate and heat flux, and decrease with the increase of saturation pressure. Besides, the boiling heat transfer coefficient of working fluids increases first and then decreases with the increase of vapor quality, which indicates that there is transitional vapor quality. What s more, the value of transitional vapor quality of R245fa/R141b is greater than that of R245fa and R141b. When the vapor quality is less than 0.55, the heat transfer coefficient of the mixture is lower than that of the pure working fluid. On the contrary, when the vapor quality is greater than 0.55, R245fa/R141b can achieve a higher heat transfer coefficient. The boiling heat transfer coefficient of R245fa/R141b increases with the increase of R245fa mass fraction. Among several selected correlations, the Gungor-Winterton correlation can predict the boiling heat transfer coefficient more accurately, and the average absolute error is 16.67%.

Key words: horizontal smooth tube, binary mixture, phase change, prediction correlation, heat transfer

中图分类号:

TK 124

王志奇, 贺妮, 罗兰, 夏小霞, 左青松. 水平管内R245fa/R141b沸腾换热特性的实验研究[J]. 化工学报, 2020, 71(4): 1588-1596.

Zhiqi WANG, Ni HE, Lan LUO, Xiaoxia XIA, Qingsong ZUO. Experimental investigation on flow boiling heat transfer of R245fa/R141b in horizontal smooth tube[J]. CIESC Journal, 2020, 71(4): 1588-1596.

图/表 12

图1 水平管内流动沸腾特性实验系统流程图1—立式多级离心泵；2—干燥过滤器；3—节流阀；4—质量流量计；5—预热段；6—视镜；7—实验段；8—石英玻璃视镜；9—蒸发压力调节阀；10—冷凝器；11—储液罐；12—调压器

Fig.1 Flow chart of flow boiling experimental system in horizontal tube

图2 实验段热电偶布置示意图

Fig.2 Schematic diagram of thermocouple arrangement in experimental section

表1 实验测量仪表主要参数

Table 1 Main parameters of measurement devices

测量仪表	型号	量程	精度
质量流量计	DMF-1-3-A	0 ~ 500 kg/h	0.2%
热电偶	T型	0 ~ 200℃	±0.1℃
精密压力表	YB-150B	0 ~ 1.6 MPa	0.25%
压力变送器	PPM-T132A	0 ~ 1.6 MPa	0.5%FS
差压变送器	PPM-T3051	0 ~ 50 kPa	0.1%FS
数字万用表	VC980+	0 ~ 200 V 0 ~ 20A	0.5%

图3 单相流动实验中的热损失率

Fig.3 Heat loss rate in single-phase flow experiment

图4 单相实验所测Nu与计算所得Nu的对比

Fig.4 Comparison of measured and calculated Nu in single-phase experiment

表2 实验主要参数最大相对不确定度

Table 2 Maximum relative uncertainty of main parameters of experiment

实验参数	相对不确定度/%
T	0.224
p	2.687
G	0.531
q	5.431
h_exp	11.493
x_in	5.434
x_out	7.688

图5 不同质量流速下R245fa/R141b (0.5/0.5) 的沸腾传热系数随干度的变化

Fig.5 Boiling heat transfer coefficient of R245fa/R141b (0.5/0.5) with vapor quality at different mass velocities

图6 不同热通量下R245fa/R141b (0.5/0.5) 的沸腾传热系数随干度的变化

Fig.6 Boiling heat transfer coefficient of R245fa/R141b (0.5/0.5) with vapor quality at different heat flux

图7 不同饱和压力下R245fa/R141b (0.5/0.5) 的沸腾传热系数随干度的变化

Fig.7 Boiling heat transfer coefficient of R245fa/R141b (0.5/0.5) with vapor quality at different saturation pressure

图8 不同工况下质量分数对R245fa/R141b沸腾传热系数的影响

Fig.8 Effects of mass fraction of R245fa on heat transfer coefficients of R245fa/R141b under different conditions

图9 4种关联式的预测结果

Fig.9 Prediction results of four correlations

表3 光滑管内沸腾传热系数关联式预测精度

Table 3 Predictive accuracy of correlation for boiling heat transfer coefficient in smooth tubes

关联式	MAD/%	30%以内数据点/%	25%以内数据点/%
Gungor-Winterton^[23]	16.76	82.74	75.11
Liu-Winterton^[12]	17.62	84.34	77.69
Zhang^[29]	38.51	52.33	47.13
Zou^[22]	17.94	84.21	77.22

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