In-tube Evaporation Pressure-drop Characteristics of R290 and R404A

doi:10.3969/j.issn.0253-4339.2006.02.005

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In-tube Evaporation Pressure-drop Characteristics of R290 and R404A

更新时间：2025-09-03

- In-tube Evaporation Pressure-drop Characteristics of R290 and R404A
- Journal of Refrigeration Vol. 27, Issue 2, Pages: 17-20(2006)
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- DOI：10.3969/j.issn.0253-4339.2006.02.005
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- Published：2006
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In-tube Evaporation Pressure-drop Characteristics of R290 and R404A[J]. Journal of Refrigeration, 2006, 27(2): 17-20.
DOI：

In-tube Evaporation Pressure-drop Characteristics of R290 and R404A[J]. Journal of Refrigeration, 2006, 27(2): 17-20. DOI： 10.3969/j.issn.0253-4339.2006.02.005.

摘要

将R22的两种新型替代工质R290和R404A在光管和内螺纹管中的沸腾换热压降实验结果与Lockhart ＆ Martinelli压降计算关联式预测结果进行了比较，并依据工质R290和R404A在内螺纹管中的实验压降值对Lockhart ＆ Marlinelli压降计算关联式进行了修正。结果表明Lockhart ＆ Martinelli关联式对R404A在光管和内螺纹管的沸腾换热摩擦压降，均有良好的预测精度，平均偏差分别为-11．52％和-17．86％。Lockhart ＆ Martinelli关联式可以较好的预测R290在光管内的沸腾换热摩擦压降，平均偏差为-21．68％；经修正后的Lockhart ＆ Martinelli关联式可以较好的预测R290在在内螺纹管中的沸腾换热摩擦压降，Lockhart ＆ Martinelli关联式乘上修正系数2．06后的修正值与实验值偏差较小，平均偏差为2．37％。研究结果对R290和R404A蒸发器的工程设计及优化具有一定参考意义。

Abstract

The experimental results of in-tube evaporation pressure-drop of R290 and R404A in the horizontal smooth tube and the horizontal microfin tube were compared with calculation results by Lockhart & Martinelli pressure-drop correlation

respectively.Moreover

based on the experimental data of R290 and R404A

Lockhart & Martinelli pressure-drop correlation was modified adequately.For R404A.the correlation shows good agreement with experimental values with mean deviation of-11.52% for the smooth tube and-17.86% for the microfin tube.Lockhart & Martinelli pressure drop correlation can also predict well the in-tube evaporation pressure-drop of R290 for the smooth tube with mean deviation of-21.68%.However

2.06 to agree well with the experimented data should multiply the predicted value for the microfin tube by Lockhart & Martinelli correlation

and the mean deviation is 2.37%.

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